@conference {41112,
	title = {The Evolution of Liveweight Variance in Angus Steers and Strategies for Control.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {59},
	year = {1999},
	month = {Jan},
	pages = {173-176},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The effect of year of birth and nutritional treatment on liveweight variance in mobs of Angus steers from birth until approximately 30 months-of-age is examined. Significant (P<0.01) differences in liveweight variance at 30 months-of-age were recorded between years. The environment of the calves over the first 20 days of life appeared to affect the development of mob variance, steers which experienced early life on a sawdust pad showing higher variance at 30 months-of-age in liveweight and carcass weight. Restricted nutrition during the first winter of the steer{\textquoteleft}s life was associated with a significantly (P<0.05) higher variance in 30 month liveweight (standard deviation 24.0 v 37.8kg). Within mob, lower rates of liveweight change were associated with an increase in liveweight variance (r = -0.72). A mathematical model was used to assess the effects of controlled mating strategies on mob variance. Minor improvements were possible. The implications of controlling mob variance for farm quality assurance management is discussed. },
	issn = {1176-5283},
	author = {Pleasants AB and McMillan WH and Barton RA}
}
@conference {41043,
	title = {Growth and carcass composition of Angus steers raised together from birth and managed on two post-weaning nutritional},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {58},
	year = {1998},
	month = {Jan},
	pages = {252-255},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Two groups of 33 Angus steers aged 270 days and weighing 179 {\textpm} 2.1 kg were allocated after weaning to 2 pasture regimes designed for high (H) and low (L) mean Liveweight. When the treatments finished after 138 days liveweights were 242 {\textpm} 3.7 kg (H) and 218 {\textpm} 3.7 kg (L). Both H and L groups were then grazed together on pasture until slaughter at 30 months of age. At slaughter fat depth at the 12th rib, weight of kidney and channel fat, ribeye area, and the trimmed fat, bone and lean (90\% visual lean) were measured from the right side of the carcass. Carcass weight was the same for both treatment groups (258 {\textpm} 2.5 kg). The L group had faster liveweight gain than the H group for 283 days after treatment, but not thereafter. Steers from the L treatment had more kidney and channel fat (P<0.02). A significant (P<0.01) regression coefficient of 0.05 {\textpm} 0.019 for carcass weight on kidney and channel fat weight existed for steers in the H group, but not the L group. Rate of live weight gain before weaning was significantly (P<0.01) related to the weight of trimmed bone and lean at slaughter. Differences between animals in live weight gain at the end of the treatment period affected the weight of kidney and channel fat in the L group (P<0.01), and the weight of trimmed fat in the L group (P<0.05). These results are discussed in context of effects of growth rate on tissue development in cattle. },
	issn = {1176-5283},
	author = {Pleasants AB and Barton RA and Ball AJ and Oddy VH}
}
@conference {40629,
	title = {Nutritional buffering: Do we make the best use of this phenomena in the breeding cow},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {54},
	year = {1994},
	month = {Jan},
	pages = {329-332},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The nutritional buffering capacity of the beef cow, defined as the  
ability to absorb low levels of feeding without compromising productivity, is  
reviewed in regard to winter management.  It is shown that resistance to  
liveweight loss is repeatable for cows within the same herd between years  
(correlations 0.4 to 0.8, P<0.01).  However this capacity is associated with  
lower calf weaning weight (correlations 0.3 to 0.5, P<0.05).  There was no  
association between the amount of winter liveweight loss and cow liveweight,  
calf birth weight or time to first oestrus in the cow. It is shown that these  
results are consistent with evidence for the variation of maintenance  
requirements between cows. 
 
It is suggested that the buffering capacity of the beef cow could be exploited  
through animal breeding or by management of early nutrition.  There may be no  
one cow type which is optimal for all farming situations, and instead a range of  
cow types which are more or less able to buffer feed shortages may be  
preferred. 
 },
	issn = {1176-5283},
	author = {Pleasants AB and Barton RA and McCall DG}
}
@conference {40533,
	title = {Fat colour and meat colour in different breeds of steers in five consecutive years raised on pasture and slaughtered at 30 months of age},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {53},
	year = {1993},
	month = {Jan},
	pages = {389-392},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Three experiments were carried out to determine the effects of short term nutritional changes, stress and changes in carotene content of the diet on plasma carotene concentrations (PCC) and the relative ranking of the cattle for PCC. None of the treatments affected the ranking of the cattle for PCC even though the changes in dietary carotene intake caused large changes in mean PCC.},
	issn = {1176-5283},
	author = {Barton RA and Pleasants AB}
}
@conference {40438,
	title = {Precalving nutrition of heavy two year old Angus heifers weighing 415 kg at calving},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {303-306},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A short term grazing trial was conducted on a central Taranaki dairy farm to study the effects on milk production of regular light dressings of nitrogen fertiliser (N), when compared to a single heavy application. Fifteen paddocks were allocated to each of two treatments. Both treatments consisted of 50 kg N/ha applied as either a single heavy application (50 kg N/ha) on 10 September (50x1 treatment), or frequent light applications (10 kg N/ha), applied progressively from 10 September directly after the following 5 grazings (10x5 treatments). Grazing of herd alternated between the two treatments with 6 paddocks of one treatment being grazed for 4 consecutive days. Total milksolids (MS) production data was obtained for days 3 and 4 of each grazing period. Total net herbage accumulation from August to mid-January was similar for the two treatments even though there was a difference in the pattern of accumulation. The 50x1 treatment resulted in 28\% higher net herbage accumulation between 12 November and 11 January. Botanical composition of the pastures in September, November and December indicated that 50x1 treatment increased the ryegrass content in November. Total MS production was 400 kg MS/ha between 1 October and 10 January for both treatments. The monthly MS production differences between the treatments were small. The results show there to be no advantage in terms of MS production to light regular applications of nitrogen fertiliser when compared to a single heavy application.},
	issn = {1176-5283},
	author = {Pleasants AB and Barton RA}
}
@conference {40359,
	title = {Optimization of {\textquoteright}herd-in-calf rate{\textquoteright} with respect to the length of the postpartum anoestrous period in Angus cows suckling calves},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {459-464},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A trial was undertaken to evaluate the effectiveness of the  CIDR-B in buffalo. Twenty four, 20 month old buffalo heifers had CIDR{\textquoteright}s  inserted (day 0) for 12 days. Each heifer was injected intramuscularly  with 10 mg of oestradiol benzoate at CIDR insertion and 150 IU of PMSG  at CIDR removal. Two buffalo bulls fitted with chin ball harnesses were  introduced into each of 2 groups of 12 heifers. Continuous observations  of mating activity commenced 24 hours after CIDR withdrawal. The  heifers were bled for progesterone analysis on days -20, -9, 0, 2, 7, 12  and 26.9 CIDR{\textquoteright}s (38\%) lost from the heifers were replaced immediately  after the losses were noticed. The mean interval from CIDR removal to  onset of mating activity was 50.3},
	issn = {1176-5283},
	author = {Pleasants AB and Barton RA and Morris ST and Anderson WJ}
}
@conference {40083,
	title = {The stability of the relationship between subcutaneous fat percent in the rack and the side for Southdown ram carcasses},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {48},
	year = {1988},
	month = {Jan},
	pages = {29-32},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The carcass composition of pasture-fed crossbred ram lambs of the Finn, Texel, Oxford Down, Border Leicester and Suffolk breeds was compared at the Hopuhopu Animal Quarantine and Research Station in 1987. Early results were in close agreement with overseas studies which have highlighted the low subcutaneous fat depth of Texel crossbreds in comparison with lambs from Suffolk sires at the same carcass weight. Finn crossbreds were relatively lean subcutaneously but had relatively more kidney fat. Texel crosses showed superior eye muscle development at constant carcass weight.},
	issn = {1176-5283},
	author = {Kadim IT and Purchas RW and Rae AL and Barton RA}
}
@conference {39991,
	title = {Progeny testing for lean meat production in the Poll Dorset breed},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {46},
	year = {1986},
	month = {Jan},
	pages = {45-48},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The composition of the dressed carcasses of 54 mixed-breed ewes was predicted from their hot carcass weight (HCW), measurements C and GR, and carcass wall thickness taken on the left (GPL) and right (GPR) sides 13 cm from the mid-line between the 11th and 12th ribs with an electronic Hennessy grading probe. The right side of each carcass was dissected into fat, muscle and bone. Mean HCW was 25.4 kg, GR was 16.9 mm, C was 6.6 mm, GPL was 22.1 mm, GPR was 22.7 mm, dissectible fat was 32.4\%, muscle was 52.4\% and bone was 14.1\%. Of the variation in carcass fat \%, GPR accounted for 74\% and GR for 78\%. When combined with HCW, GPR accounted for 77\% and Gr for 80\%. This last value was not further increased by adding more variables. GPR accounted for 67\% of the variation in carcass muscle \% and GR for 68\% of this variation. When combined with HCW these values increased to 71\% and 73\% respectively and were not further increased by adding more variables. GPR and GR were also the best predictors of percentage bone.},
	issn = {1176-5283},
	author = {Barton RA and Pratt RM and Rae AL}
}
@conference {39771,
	title = {Calving behaviour of single-suckled Angus cows and their calves born in the spring},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {42},
	year = {1982},
	month = {Jan},
	pages = {69-72},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Oversowing and top-dressing of a small area within a defined but unfenced part of a high country summer range caused sheep to concentrate on that treated area. Sheep density and grazing pressure were respectively 4 and 7 times greater than on the untreated area. As fewer sheep grazed the untreated area dry matter utilisation overall decreased in the following 2 years.},
	issn = {1176-5283},
	author = {Aitken VR and Holmes RJ and Barton RA}
}
@conference {39782,
	title = {New Zealand export carcass grades of lamb, mutton and beef: past, present and probable},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {42},
	year = {1982},
	month = {Jan},
	pages = {107-112},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The carcass weight, composition and meat quality of entire rams, Kelly and Russian castrates, wethers and ewes under 6 months old were compared. Wether lamb carcasses averaged 0.6 kg heavier than those of the ewes and the Russian (0.4 kg), Kely (0.6 kg) and ram (0.8 kg) carcasses were heavier than those of the wethers slaughtered at the same mean age. The ram and partial castrates were less fat than the wethers (2.4 to 3.3\%) which in turn were 2.7\% less fat than the ewes. There were no practical differences in percentage carcass cuts between the rams, partial castrates or castrates. A consumer taste panel in which 48 participating families cooked and tasted a ram and wether leg roast detected no difference between the two types of meat.},
	issn = {1176-5283},
	author = {Barton RA}
}
@conference {39725,
	title = {The repeatability of ultrasonic fat-depth measurements made on sheep up to 18 months of age},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {41},
	year = {1981},
	month = {Jan},
	pages = {133-139},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Purchas RW and Rae AL and Barton RA and Beach AD}
}
@conference {39470,
	title = {Onset of puberty in Angus, Friesian, Friesian x Angus, and Friesian x Jersey heifers},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {35},
	year = {1975},
	month = {Jan},
	pages = {97-102},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Pleasants AB and Hight GK and Barton RA}
}
@conference {39449,
	title = {Types of cattle to feed in relation to the needs of markets},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {34},
	year = {1974},
	month = {Jan},
	pages = {233-240},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA}
}
@conference {39310,
	title = {Classification and grading of beef and lamb in the United States of America},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {30},
	year = {1970},
	month = {Jan},
	pages = {172-185},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA}
}
@conference {39260,
	title = {A comparison between Friesian, Jersey and Friesian-Jersey cross steers},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {28},
	year = {1968},
	month = {Jan},
	pages = {180-181},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA and Jones CF and Donaldson JL and Barnes FR and Evans DA and Clifford HJ}
}
@conference {39168,
	title = {Presidential Address: Better Meat for a Bigger Market},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {24},
	year = {1964},
	month = {Jan},
	pages = {1-16},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA}
}
@conference {39163,
	title = {Variations in the iodine values of fats from fatty, muscular and bone tissues of the Romney sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {23},
	year = {1963},
	month = {Jan},
	pages = {121-130},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA and Shorland FB and Rae AL}
}
@conference {39082,
	title = {Assessment of Fat in Mutton and Lamb},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {18},
	year = {1958},
	month = {Jan},
	pages = {112-125},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA and Kirton AH}
}
@conference {39045,
	title = {Face Cover in Romney Sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {16},
	year = {1956},
	month = {Jan},
	pages = {59-65},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Cockrem FR and Barton RA and Rae AL}
}
@conference {38926,
	title = {Influence of Sire on Fat Lamb Quality},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {9},
	year = {1949},
	month = {Jan},
	pages = {66-84},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Barton RA and Phillips TO and Clarke EA}
}
