@conference {40401,
	title = {Dose-response to a single injection of PMSG in Merino ewes carrying a double copy of the Booroola FecB gene},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {153-156},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Sheep shorn with a cover-comb were compared with conventionally  shorn sheep in two experiments. In the first experiment, ewe and lamb  performance and some aspects of ewe physiology were measured with 60  Romney ewes which were shorn before lambing. In the second experiment,  oxygen consumption by 12 Romney hoggets was measured before and after  shearing in calorimeters at 10 C.   In the first experiment, herbage intake by ewes in the 3 weeks post-  shearing was not affected by shearing method. There were no treatment  effects on the liveweight of ewes, birthweight and growth rate of lambs  nor on ewe wool production during the 2 months post-shearing. However,  on days 1 and 3 after shearing the plasma concentrations of non-  esterified fatty acids and of 3- hydroxybutyrate were higher in the ewes  shorn with the conventional comb than in those shorn with the cover  comb.   In the second experiment oxygen consumption was increased immediately  after shearing, by 47\% and 25\% in the conventional- and cover-comb sheep  respectively. The difference between the two groups, which remained  significant until day 12 post-shearing, decreased with time until it  disappeared on day 22.   The results show that sheep shorn with the cover-comb were significantly  more resistant to cold conditions than those shorn with the conventional  comb, particularly during the 3 days post-shearing. Use of the cover  comb may offer a useful low cost method of reducing the effects of cold  conditions after shearing, but its effects on mortality have not been  demonstrated.  },
	issn = {1176-5283},
	author = {Shackell GH and Isaacs KL}
}
@conference {40406,
	title = {Effect of sire, breed and age on plasma FSH concentrations in FecB FecB and Fec+ Fec+ Booroola rams before and after castration},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {175-178},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Feed intake and wool production data on unmated, single- and  twin-bearing/rearing ewes from a year-long field trial were incorporated  into feed budget models of a hill country farm. Increasing the basal  liveweight of an unmated ewe from an average of 45 to 55 kg increased  greasy wool production from 4.15 to 5.10 kg/ewe. Relative to the annual  feed requirements (614 kg DM/y) of a typical breeding ewe (1 sheep stock  unit (ssu) on the case farm the annual feed requirements of unmated 45,  50 and 55 kg ewes were estimated to be 0.58, 0.66 and 0.72 ssu. At 1991  costs and prices the gross margins (GM) were $15.50/ssu for breeding  ewes (100\% lambs weaned) and, depending on liveweight, from $7.12 to  $8.11/ssu for the all-wool options. The breeding ewe policy remained  more profitable even if low lamb prices or a poor lambing percentage  were achieved.  },
	issn = {1176-5283},
	author = {Isaacs KL and McNatty KP and McLeod BJ and Condell L and Littlejohn RP}
}
@conference {40293,
	title = {A simplified MOET technique for Merino ewes carrying a double copy of the Booroola FecB gene},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {107-110},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Two trials were conducted to determine the effect of different  oestrous synchronisation regimens on oestrous behaviour, timing of  ovulation and fertility of fallow deer. In Trial 1, 59 mature does were  allocated to 6 treatment groups (n+9-10 per group). Does in Groups 1, 2  and 3 each received an i.m. injection of an analogue of prostaglandin  F2alpha (PG; 500 ug cloprostenol) on Day 13 of a synchronised oestrous  cycle. Animals in Group 2 and 3 also received 50 or 100 IU PMSG  respectively at the time of PG administration. Does assigned to Groups  4, 5 and 6 each received an intravaginal CIDR device for 14 days with  animals in Group 5 and 6 also receiving 50 or 100 IU PMSG respectively,  at the time of CIDR device withdrawal. Incidence of oestrus was higher  following treatment with CIDR devices than with PG (29/30 vs 12/29,  P<0.001). PMSG induced earlier onset of oestrus (34.6},
	issn = {1176-5283},
	author = {Shackell GH and Isaacs KL}
}
@conference {40288,
	title = {The use of full-sibling pairs to measure plasma FSH concentrations in Booroola ewe and ram lambs},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {87-90},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Forty-eight yearling Holstein-Friesian steers were assigned to  three diets (Panicum virgatum (P) var. Cave-in-rock, Dactylis  glomerata (D) var. Hallmark and Medicago sativa (M) var. Waterman  Loomis 316) fed at two levels of intake (low (L) 65g DM kg-1 liveweight  -0.75 day -1 or high (H) 90 g DM kg -1 liveweight -0.75 day -1) during a  6 month growth study. At the conclusion of the study animals were  stunned, exsanguinated and promptly eviscerated and the rumen quickly  emptied of its contents and subsequently weighed. Upon slaughter, rumen  tissue samples were acquired from the ventral sac and placed in  oxygenated M199 media. Mucosa and muscularis weights were determined  along with their total 02 consumption, ouabain-senitive- (OSO2) and  ouabain-insensitive-(OIO2) respiration. Tissue oxygen consumption was  determined in vitro using a YSI Clark style electrode. Total,  Mucosa and muscularis weights were greater (16.9-43.5\%) with H and  tended to be affected by diet (P<0.10). On a tissue basis, rumen muscle  O2 consumption was not affected by treatment but mucosal OSO2 and  percent inhibition of O2 consumption by ouabain were higher (6.9-94\%)  with Medicago. Total rumen O2, OSO2 and OIO2 consumption were higher  (8.6-80.5\%) in H (P<0.05) and diet affected OSO2. Rumen muscle total O2  consumption was greatest (3.51 ul 02/mg/hr) for D and altered by level  of intake (P<0.03). Mucosal OSO2 and OIO2 were greater with H (P<0.04  and P<0.07, respectively). Total rumen O2 consumption is dominated by  organ size rather than changes in weight specific O2 consumption.  Therefore, at high forage intakes part of the decrease in the efficiency  of ME utilisation is a consequence of increased heat production from the  larger rumen.  },
	issn = {1176-5283},
	author = {Isaacs KL and McNatty KP and Littlejohn RP}
}
