@conference {69509,
	title = {Identification of novel wool keratin intermediate filament genes in sheep skin},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {70},
	year = {2010},
	month = {Jun},
	pages = {222-228},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Palmerston North},
	abstract = {Keratin intermediate filament (KIF) genes encode key proteins for hair and wool formation. A total of 17 expressed human KIF genes involved in hair formation are annotated. However, to date, only eight wool KIF genes have been reported. In this study, six new cDNA sequences (KRT32, KRT33B, KRT34, KRT39, KRT40 and KRT82) representing previously unreported wool KIFs were identified using a contiguous ovine sequence library constructed primarily from ESTs. The expression of three other KIF genes (KRT36, KRT84 and KRT87) was confirmed by PCR using sheep skin total RNA. The analogue of human KRT37 (type I) was unable to be identified, while KRT87 (type II) was present in sheep but not in humans. Therefore 10 type I and seven type II KIF family members have been identified in sheep in comparison to 11 and six KIFs in the human. These 17 KIF genes are likely to represent the complete or near-complete set involved in wool formation. The annotation of these genes will facilitate investigation into their patterns of expression in wool follicles and their roles in the determination of fibre attributes.},
	issn = {1176-5283},
	author = {Yu Z-D and Gordon SW and Wildermoth JE and Wallace OAM and Nixon AJ and Pearson AJ}
}
@conference {41784,
	title = {Gene expression profiling of wool follicle growth cycles by cDNA microarray},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {68},
	year = {2008},
	month = {Jan},
	pages = {39-42},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Brisbane, Australia},
	abstract = {Wool growth in Wiltshire sheep was synchronised by daylength manipulation to allow identification of genes that are regulated during transitions in the wool follicle cycle. Pair-wise comparisons between growing and resting phases were conducted using both direct and indirect cDNA microarray analysis. The two approaches were well correlated at three different levels: overall similar patterns of gene expression, detection of changes in keratin gene expression, and reduced differential expression between closer cycle stages. Using more slides, the indirect approach identified more expressed sequence tags (ESTs) (indirect 1132, direct 444), and had higher coverage of wool keratins (indirect 78\%, direct 42\%). This study demonstrates the usefulness of cDNA microarray for expression profiling in whole skin. Further characterisation of genes identified by this work, particularly the smaller sets of ESTs derived from comparisons at early stages of follicle regression and regrowth, would improve our understanding and provide leads for alternative wool harvesting technology or enhancing wool growth. },
	issn = {1176-5283},
	author = {Yu Z-D and Gordon SW and Pearson AJ and Henderson HV and Craven AJ and Nixon AJ}
}
@conference {42004,
	title = {Expression of keratin intermediate filament genes in wool follicles of wiltshire sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {67},
	year = {2007},
	month = {Jan},
	pages = {332-338},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Wanaka},
	abstract = {Co-ordinated expression of keratin intermediate filament genes in the wool follicle is essential for the formation of the wool fibre. The expression patterns of three acidic (oKRT31, oKRT35, oKRT38), one neutral-basic (oKRT85) and one acidic inner rootsheath keratin (oKRT27) were localised by in situhybridisation in the wool follicles of Wiltshire sheep. All five genes show distinct expression patterns in the primary wool follicles of the face and lower leg, but have comparable keratinisation zones to their human orthologues. During follicle regression, the expression of these genes is first attenuated distally, gradually becoming restricted to proximal regions before terminating in dormant follicles. The involvement of the expression of oKRT27, oKRT31 and oKRT85, but not oKRT35 and oKRT38, in brush-end formation indicates specialised regulation of keratin expressionin the development of this anchoring structure. Intriguingly, significant differences in the expression of cortical oKRT31, oKRT35, oKRT38 and oKRT85 between primary and secondary follicles were identified.The association of asymmetrical expression of some keratins with follicle curvature raises the possibility of a role infibre crimp formation. Future studies of these and other keratins will generatean understanding of the structural basis of fibre attributes that could contribute to development of novel wool fibres for specific applications.},
	issn = {1176-5283},
	author = {Gordon SW and Yu Z-D and Nixon AJ and Pearson AJ}
}
@conference {41884,
	title = {Environmental and physiological mechanisms underlying wool growth rhythms in New Zealand coarse wool sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {66},
	year = {2006},
	month = {Jan},
	pages = {144-148},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Napier},
	abstract = {Coarse-woolled sheep breeds such as the Romney exhibit a pronounced annual cycle of wool growth with concomitant changes in fibre length growth rate and mean fibre diameter with maxima in summer and minima in winter. This cycle, which is entrained by seasonal changes in daylength via changes in circulating prolactin, parallels wool growth rate in Romney sheep. The cycle is also influenced by complex interactions between nutrient supply and hormones associated with reproductive status. A marked depression in wool production occurs during early pregnancy, which cannot be completely ameliorated by supplementary feeding, and does not directly involve prolactin. Additionally, in ewes, experimental and pharmacological increases and decreases in the prolactin concentration at parturition and during lactation are associated with increases and decreases, respectively, in spring and summer wool growth rate. A greater appreciation of the different mechanisms that temporally influence the wool growth cycle represents a potential means to change fleece characteristics. The development of sheep genotypes with a reduced amplitude of their wool growth cycle would significantly contribute to a reduction in fibre variability that can affect processing performance. },
	issn = {1176-5283},
	author = {Kendall PE and Sumner RMW and Pearson AJ}
}
@conference {41625,
	title = {Genomic technologies to create new opportunities for wool growers - Introductory remarks},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {66},
	year = {2006},
	month = {Jan},
	pages = {113},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Napier},
	abstract = {Efficient sheep farming of the future will demandreduced labour costs, ease of shearing, and minimised susceptibility to flystrike, while modern markets simultaneously demand reduced chemical use and high standards of animal welfare. Sheep witha reduced area of the body covered with fleece may provide a practical solution to these conflicting requirements. Research has shown that it is possible to select sheep for bare faces, legs, belly and breech, and that atleast some of these traits behave as though they are controlled by recessive genes, but that some only becomeevident later in life. Patterns of fleece distribution define major skin domains in the sheep that are evident in other mammals. We hypothesise that discrete skin domains arise because fibroblasts that induce wool follicle development originate from different embryonic tissues and carry with them differing developmental programmes for each follicle type. Identifying genes underlying variation in fleece distribution would allow desirable distributions to be established in sheep of diverse genetic backgrounds. Markers for distribution traits would enable us to introgress appropriate genes into flocks that do not carry them, and to determine early in life which animals might express the traits as adults.},
	issn = {1176-5283},
	author = {Pearson AJ}
}
@conference {41629,
	title = {Micro-arrays as a discovery tool for wool genomics},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {66},
	year = {2006},
	month = {Jan},
	pages = {129-133},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Napier},
	abstract = {Wool follicle development and growth is a highly ordered and complex process involving the sequential expression of numerous genes within diverse cell populations. The aim of present studies using microarray analysis is to identify genes and pathways involved in the growth of wool follicles which could be utilised to increase farm productivity and improve the characteristics of Australasian wools. An ovine cDNA array was developed including sequences derived from sheep skin containing wool follicles in different growth stages encompassing many structural and regulatory genes necessary for follicular growth. Initial comparison of stages of wool follicle regression show marked changes in the expression levels of numerous genes including wool keratins. Two parallel research projects in Australia and New Zealand supported by SheepGenomics are currently utilising microarray technology to profile gene expression during key stages of wool follicle development in the foetus and follicular cycling associated with fleece shedding. },
	issn = {1176-5283},
	author = {Yu Z-D and Bawden CS and Henderson HV and Nixon AJ and Gordon SW and Pearson AJ}
}
@conference {41882,
	title = {Wool keratins - the challenge ahead},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {66},
	year = {2006},
	month = {Jan},
	pages = {133-139},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Napier},
	abstract = {Sheep wool is predominantly composed of keratin proteins. These comprise keratin intermediate filament proteins embedded in a matrix of smaller keratin associated proteins. As a result of polymorphisms and post-translational modifications, these proteins display many more family members than there are genes. Recent studies using improved gene expression, electron tomography and proteomic techniques have provided useful preliminary data on the association of keratins with certain fibre properties. Current research is quantifying keratin gene expression in the skin and the consequent wool protein compositional differences between breeds of divergent fibre and fleece characteristics. A detailed understanding of the control of keratin gene expression and fibre protein composition arising from these and other studies will provide the foundation for the development of novel high-value wool types, solubilised keratins for specialised cosmetic applications and reconstituted keratin polymers for biomedical applications. },
	issn = {1176-5283},
	author = {Plowman JE and Bryson WG and Yu Z-D and Gordon SW and Pearson AJ and Kelly RJ}
}
@conference {41065,
	title = {Fleece production patterns in Romney ewes: Effects of photoperiod, pregnancy and lactation},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {59},
	year = {1999},
	month = {Jan},
	pages = {30-33},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Twenty one Romney ewes were housed indoors for 12 months from February to determine the effect of season, pregnancy and lactation on wool growth. Ten ewes were naturally mated in April to lamb in September. The ewes were fed to maintain constant maternal body weight and a midside patch harvested monthly to determine clean fleece growth rates. An effect of pregnancy on individual fibre length growth rate, determined by autoradiography, occurred as early as 21-35 days after joining. During the second month of gestation, fleece production and mean fibre diameter fell below that of non-pregnant ewes and continued to diverge until parturition. Wool production rose in the non-pregnant group from August, but did not increase in lambing ewes until after parturition. These data suggest that pregnancy is associated with an early hormonally-mediated depression in follicle output superimposed on the decline associated with winter photoperiod. },
	issn = {1176-5283},
	author = {Pearson AJ and Kendall PE and Ashby MG and Wildermoth JE}
}
@conference {41066,
	title = {Seasonal wool growth patterns and the follicle and fibre characteristics of New Zealand feral sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {59},
	year = {1999},
	month = {Jan},
	pages = {34-38},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Wool follicle and fibre characteristics, and aspects of their seasonality were assessed in feral sheep from the Hokonui Hills (Merino origin), Campbell Island (Merino x long-wool breeds) and Raglan Peninsula (Romney). Live weight, fleece weight, staple length, crimp frequency, fibre diameter, fibre curvature, follicle density and secondary to primary follicle ratio differed between breeds, reflecting their breed origins. Mean clean fleece weights of the feral breed groups were approximately half that of their modern counterparts. Factors contributing to the low productivity were reduced staple length and follicle density, and a brief cessation of growth by some follicles during spring. The mean amplitude of rhythms in seasonal wool growth and fibre diameter increased with age, and appear to have converged to similar values, contrasting with their modern breed counterparts. },
	issn = {1176-5283},
	author = {Pearson AJ and Ashby MG and Sumner RMW and Nixon AJ}
}
@conference {41056,
	title = {Prolactin receptors are highly expressed in wool follicle dermal papillae.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {58},
	year = {1998},
	month = {Jan},
	pages = {298-302},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Seasonal variation in wool growth has major impacts on production and fibre characteristics. These changes in wool follicle output are driven, at least in part, by circulating prolactin. We therefore localised prolactin receptors (PRLR) in skin from Wiltshire sheep over a wool follicle cycle induced by prolactin. PRLR expression was visualised by in situ hybridisation, immunocytochemistry and radioligand binding. The three approaches showed concordant distributions of PRLR and its mRNA. PRLR mRNA was most abundant in the dermal papilla, but also evident in the outer root sheath, hair germ, skin glands and epidermis. Expression in the hair germ was up-regulated in telogen. Location of PRLR in the dermal papilla and outer root sheath indicates action of prolactin directly on the growth controlling cells within wool follicles. These spatial and cycle-related patterns of PRLR expression contribute to the growing knowledge of the control of wool growth and its application in the wool industry. },
	issn = {1176-5283},
	author = {Nixon AJ and Choy VJ and Ford CA and Pearson AJ}
}
@conference {40660,
	title = {A comparison of protocols for the photoperiodic induction of synchronised wool follicle growth cycles},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {55},
	year = {1995},
	month = {Jan},
	pages = {35-38},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {This study endeavoured to characterise the effects of breed and  calving liveweight (CW) on postpartum (pp) ovarian activity in 16  Friesian (F) and 16 Jersey (J) heifers. Half of the animals within each  breed were differentially fed (High vs Low: H vs L) during the 8 weeks  before calving to achieve CWs (24 h pp) of 404 (FH), 354 (FL), 334 (JH)  and 279 (JL) kg. They were fully fed as one group after calving.  Ovarian ultrasonography showed that the FL group had the longest  postpartum anovulatory interval (PPAI) of 77 days compared to 47 days  among other groups. The second dominant follicle pp emerged 6 days  later in FL heifers. Breed, but not CW, affected follicle patterns in  the first normal oestrous cycle. Underfeeding of Friesian heifers  during late pregnancy extended the PPAI whereas Jerseys were not  affected to the same extent.   },
	issn = {1176-5283},
	author = {Craven AJ and Parry AL and Ashby MG and Pearson AJ}
}
@conference {40583,
	title = {The effect of long-day photoperiod treatments on plasma prolactin and wool follicle activity in New Zealand Wiltshire sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {54},
	year = {1994},
	month = {Jan},
	pages = {135-138},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Exposure of NZ Wiltshire sheep to a long-day photoperiod during late  
winter/spring has previously been shown to alter wool follicle growth patterns.   
The present experiment was undertaken to evaluate the plasma prolactin and  
wool follicle response to treatment with either 1, 2 or 3 months of long days. 
 
Four groups of six, NZ Wiltshire ewes were subjected to long-day photoperiod  
(16L:8D) for 1 month (LD1), 2 months (LD2), 3 months (LD3) or natural  
photoperiod (control), commencing on the 3 August, after which they were  
released from light treatment into natural (indoor) spring daylength.  Weekly  
jugular blood samples were assayed for prolactin (PRL) and skin biopsies were  
histologically assessed for wool follicle activity. 
 
Circulating PRL concentrations were low in all treated and control sheep at the  
start of the experiment (19 {\textpm} 2 ng/ml).  In treated sheep mean PRL  
concentration increased (P<0.05) above control levels (8 {\textpm} 1 ng/ml) within 1  
week after exposure to long days (52 {\textpm} 4, 51 {\textpm} 5 and 55 {\textpm} 2 ng/ml for LD1,  
LD2 and LD3, respectively).  PRL concentrations remained significantly higher  
than controls (P<0.05) for the duration of each treatment reaching maxima of  
148 {\textpm} 27 ng/ml, 180 {\textpm} 43 ng/ml, and 199 {\textpm} 33 ng/ml for LD1, LD2 and LD3  
respectively.  In LD2 and LD3 treatments, PRL concentrations declined to  
control levels by 3 and 2 weeks after treatment had ceased, respectively, but in  
the LD1 treatment PRL remained significantly above (P<0.05) control levels  
until between 2 and 3 months after treatment.  Primary follicle activity (PFA)  
decreased in response to long-day treatment (P<0.01) reaching minima of 47 {\textpm}  
9\%, 36 {\textpm} 6\%, and 33 {\textpm} 11\% in LD1, LD2, LD3 sheep, respectively.  Secondary  
follicle activity (SFA) responses were most marked in the LD2 and LD3  
treatments where they fell below (P<0.05) control levels reaching minima at 2  
months into treatment (66 {\textpm} 15\% and 58 {\textpm} 13\% for LD2 and LD3,  
respectively).  Both PFA and SFA increased to over 90\%, within 1 month after  
release into natural light, in all treatments groups (except PFA for the LD1  
group which took 2 months after release to reach over 90\%). 
 
In support of previously reported trials an increasing level of plasma PRL was  
followed by a decline in follicle activity.  The optimal time frame to achieve an  
effective synchronised follicle regression was between 2 and 3 months of long- 
day treatment.  The long-day treatment system produced a complete follicle  
growth cycle in temporal synchrony and is therefore a potential model for the  
investigation of structural and biochemical processes surrounding transitions  
between active and resting stages of fibre growth. },
	issn = {1176-5283},
	author = {Craven AJ and Parry AL and Wildermoth JE and Pearson AJ}
}
@conference {40590,
	title = {Repeatability of seasonal wool growth in Merino Sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {54},
	year = {1994},
	month = {Jan},
	pages = {163-166},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Wool samples were clipped from the midside of 27 Merino rams and 33  
unmated Merino ewes born in 1990 at 4 or 8 weekly intervals, depending on  
the season, between July 1991 and January 1994.  Wool growth rat and mean  
fibre diameter were measured. 
 
Both wool growth rate and mean fibre diameter exhibited seasonal growth  
cycles which were synchronous.  The rhythm of the seasonal cycle for each  
characteristic was calculated as:- 
 
Rhythm (\%) = (Max-Min) / ((Max+Min) / 2) x 100 
 
The rhythm for wool growth rate exceeded that for mean fibre diameter while  
the rhythms for both characteristics increased significantly between the first  
and second year but not between the second and third years.  Although wool  
growth rate and mean fibre diameter were strongly correlated between adjacent  
clipping periods, the derived rhythm estimates for both characteristics were  
only weakly correlated between years.  Adjustment of the rhythm estimates for  
liveweight change during the same period significantly improved between  
sheep repeatability of the seasonality estimates. 
 
These data indicate that a significant proportion of the variation in both 
wool growth rate and mean fibre diameter was, after adjustment for liveweight  
change, associated with permanent phenotypic differences among the sheep in  
the rhythm of their seasonal wool growth cycle. },
	issn = {1176-5283},
	author = {Sumner RMW and Clarke JN and Pearson AJ and Speedy PM}
}
@conference {40529,
	title = {Plasma prolactin in Romney sheep selected for hogget fleece weight},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {53},
	year = {1993},
	month = {Jan},
	pages = {371-376},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Seventy nine mature, alpacas were scanned every 10-14 days using real time ultrasonography to visualise the foetus. There was a 24\% foetal loss between days 21-30 of gestation and parturition, with the maximum loss occurring between days 21-30 and days 31-40 of gestation. There was a 5\% loss of foetuses after day 100 of gestation.},
	issn = {1176-5283},
	author = {Clarke JN and Pearson AJ and Sumner RMW and Johnson DL and Dobbie JL and Wildermoth JE and Wrigglesworth AL}
}
@conference {40342,
	title = {An evaluation of the New Zealand Wiltshire sheep as a model for studies on the physiology of fibre growth},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {365-370},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {In New Zealand, breeding values have been predicted using the  method of selection index (Sheeplan, Beefplan, Animalplan) or variants  such as a modified contemporary comparison (Dairy Cattle). Over the  last decade, research systems for evaluating beef cattle, dairy cattle,  sheep and pigs in New Zealand have increasingly made use of Henderson{\textquoteright}s  mixed model equations. In appropriate circumstances, these equations  give rise to evaluations which are best, linear and unbiased predictions  (BLUP). This review compares and contrasts theoretical and applied  aspects of evaluation using selection index and BLUP. An example is  used to demonstrate the rationale of BLUP for evaluating animals with  records in different contemporary groups such as across flocks or years.  },
	issn = {1176-5283},
	author = {Parry AL and Pearson AJ and Morris R and Still L-A}
}
@conference {40230,
	title = {Carcass and meat quality in possums (Trichosurus vulpecula)},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {293-296},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Production data were collected over 4 years from a flock of 600   mixed-age Romney, Coopworth and Perendale ewes. There were   approximately equal numbers of each breed. Ewes within breeds and age   groups were randomly allocated to be shorn either once-yearly in   January, once-yearly in July or twice-yearly in January and July. All   ewes were grazed as a single mob throughout the year, except over mating   when they were divided into breed groups and joined with rams of their   own breed.     The twice-yearly shorn ewes gave birth to, and weaned, heavier lambs and   grew more total clean wool than the 2-once-yearly shorn groups which   were similar. Shearing treatment did not affect ewe live weight,   aspects of lamb production other than birth weight and weaning weight or   total greasy wool production. Incidence of casting was less than 1\%.     Net wool returns from the ewes shorn once-yearly in July exceeded that   of the ewes shorn twice-yearly which exceeded that of the ewes shorn   once-yearly in January.    },
	issn = {1176-5283},
	author = {Hogg BW and Catcheside LM and Mercer GJK and Pearson AJ and Ashby MG}
}
@conference {40234,
	title = {Changes in the fur quality of caged brushtail possums (Trichosurus vulpecula) maintained in captivity},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {311-316},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {This paper backgrounds important features which are likely to   influence the future of animal production in New Zealand. They include   the importance of being in the quality market, consumer attitudes,   market access and environmental/welfare concerns. In view of the   changing perceptions about animal production, the place of technology in   on-farm production needs to be carefully considered. Technologies can   be defined as {\textquoteright}soft{\textquoteright} or {\textquoteright}hard{\textquoteright}, the latter being those which introduce   major perturbations into the system. The impact on the whole system is   particularly important. The possibilities for genetic improvement are   considered in detail. The soft technology approach is favoured in that   it works with existing genetic variation but uses new technology   approach is concerned mainly with the development of transgenic animals.   Overall, developments in technology have much to contribute to the animal   industries in New Zealand, but the importance of off-farm issues such as   marketing, market access and product development are particularly  critical. There is a need to take a broad view of animal production in  considering the future.   },
	issn = {1176-5283},
	author = {Pearson AJ and Ashby MG and MacGibbon RJ}
}
@conference {40140,
	title = {Effects of melatonin on body weight, appetite and seasonal fur growth in the ferret},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {49},
	year = {1989},
	month = {Jan},
	pages = {47-52},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A controlled internal drug release device, containing progesterone (CIDR-B), was evaluated as an aid to reproductive management in beef cattle in 2 trials. In Trial 1, 223 animals, comprising 64 early calving cows, 61 late calving cows, 59 maiden cows and 39 15-month heifers (yearling heifers), were treated intravaginally with CIDR-B for either 12d (plus 10mg oestradiol benzoate; 12d CIDR-B + ODB) or for 15d (15d CIDR-B). CIDRs were reused for 5d in half the animals from 16d after initial use. In Trial 2, 145 animals, comprising 53 early calving cows, 43 late calving cows and 49 15 month heifers, were treated intravaginally with CIDR-B for either 14d (14d CIDR-B) or 21d (21d CIDR-B). At CIDR-B withdrawal, half of the animals received an intra-muscular injection of 400IU PMSG. In Trial 1, within 48h of CIDR-B withdrawal, 58\% and 54\% of the animals were mated in the 15d CIDR-B and 12d CIDR-B + ODB groups respectively. Within 96h, the incidence of mating was 87\% and 76\% respectively with the difference between treatments being more pronounced in cows (88\% v 74\%; P<0.05) than in yearling heifers (86\% v 84\%). In cows, pregnancy rate to mating over the first 4 days was 50\% in the 15d CIDR-B group and 67\% in the 12d CIDR-B + ODB group (P<0.05). In yearlings, there was an opposite tendency (71\% v 44\%; P>0.1). Final pregnancy rate was 92\% with no treatment group differences. CIDR-B ruse did not alter conception rates to first or second service but did synchronise returns. In Trial 2, within 4d of CIDR-B removal, 88\% and 97\% of the 14d CIDR-B and 21d CIDR-B groups had mated. In the 0 and 400 IU PMSG groups, 90\% and 95\% had mated. Pregnancy rate in treated animals to mating over the first 4 days following CIDR-B withdrawal were similar in the 14d CIDR-B and 21 CIDR-B groups (54\% v 57\%) and 0. and 400 IU PMSG groups (55\% v 56\%). However, pregnancy rate tended to be lower in yearling heifers compared to cows (46\% v 57\%; P>0.1). Final pregnancy rate tended to be higher in the 21d CIDR-B group than in the 14d CIDR-B group (89\% v 82\%; P>0.1). Fewer heifers were finally pregnant compared to early and late calving cows (74\% v 85\% v 95\%). In both trials, longer CIDR-B treatment intervals were associated with earlier and more synchronised matings. Acceptable pregnancy rates were achieved with CIDR-B treatment intervals of between 12d and 21d. These results indicate that CIDR-B treatment without supplementary hormones can produce acceptable synchrony and fertility in naturally mated suckling beef cows and yearling heifers.},
	issn = {1176-5283},
	author = {Pearson AJ and Ashby MG and Staples LD}
}
@conference {39571,
	title = {Hormonal responses of lambs to trucking, handling and electric stunning},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {37},
	year = {1977},
	month = {Jan},
	pages = {243-248},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Pearson AJ and Kilgour R and de Langen H and Payne E}
}
@conference {39490,
	title = {Sheep dispersal patterns on hill country: Techniques for study and analysis},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {35},
	year = {1975},
	month = {Jan},
	pages = {191-197},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Kilgour R and Pearson AJ and de Langen H}
}
