@conference {40507,
	title = {Effects of melatonin implants on mating performance of Romney and Poll Dorset rams},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {53},
	year = {1993},
	month = {Jan},
	pages = {275-280},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Breed, sex and birth rank differences in follicle density and S/P ratio were examined for South African (SA) and SAxNZ Angora goats. All primary (P) follicles but few secondary (Sf) follicles were mature at birth. Density of mature secondary (Sf) follicles increased by 150\% and 250\% in the first month after birth, in SA and SAxNZ kids respectively. Change in P and Sf+Si follicle density followed an asymptotic slope. S/P ratio was 8.4 at birth and 9.9 at 6 months. Breed differences were apparent early in life but were not persistent to 6 months of age. Sex by birth rank interactions at 4 and 6 months of age showed that single males had an advantage over twin males in P and S density (P<0.05) while twin females had an advantage over single females (P<0.05). These differences are a likely result of differences in nutritional advantage and changes in body size. S/P ratio was unaffected by breed, sex and birthrank. The results show that initiation of S follicles after birth was likely but inconsequential. Follicle density and S/P ratio do not explain breed differences in fibre and kemp production. Comparisons with other studies suggest that the SAxNZ Angora would have a higher S/P ratio than the NZ Angora.},
	issn = {1176-5283},
	author = {Muir PD and Smith NB and Staples LD}
}
@conference {40231,
	title = {Concentration of melatonin in plasma of goats treated with Regulin},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {297-300},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Sustained release of melatonin from implants or microcapsules   administered in October induced cashmere growth during November to March   in all ten, treated, cashmere-bearing goats. The mean maximum length of   the cashmere in this induced fleece ranged from 12-55mm. Another   cashmere growth cycle followed between autumn and winter. In contrast,   nineteen control goats grew cashmere only during the autumn-winter   period. Melatonin treatment increased total mean cashmere staple length   by up to 65\% for treated animals compared with controls. The onset of   growth of the autumn fleece in the treated goats was delayed as also was   the time when maximum length was achieved on shedding occurred.   Melatonin treatment should permit the shearing of the autumn fleece to   be delayed, thus reducing the risk of post-shearing losses during   inclement weather in late winter.    },
	issn = {1176-5283},
	author = {Parry AL and Paterson DJ and Litherland AJ and Death AF and Staples LD}
}
@conference {40239,
	title = {Melatonin for cashmere production},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {339-344},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Relative to an industry Romney control line, three lines derived   from screening for high prolificacy, consisting of Romneys, Perendales   and Coopworths had significantly heavier weaning weights after   adjustment for non-genetic factors with weights of 19.9 (100), 22.3   (112), 24.0 (121) and 23.9 (120) kilograms (percentage relative to the   Romney controls) for the respective flocks. The differences increase   post-weaning and when slaughtered, between 175 and 219 days of age, the   carcass weights (kg) were 12.0 (100), 14.3 (119), 16.1 (134), 15.7 (131)   respectively for the different strains. Although the base populations   of Romneys are not genetically comparable the results suggest that the   intensive screening for prolificacy has indirectly resulted in animals   capable of more rapid growth to slaughter. The differences between   strains in their carcass weight adjusted subcutaneous fat depths were   minor except that the high prolificacy Perendales had lower increases in   fat depths with increasing carcass weight and had the lowest   subcutaneous fat depths at heavy weights. Additionally the high   prolificacy Perendales had 2 to 6 percent larger estimated L.   dorsi areas than the other genotypes.    },
	issn = {1176-5283},
	author = {Litherland AJ and Paterson DJ and Parry AL and Dick HB and Staples LD}
}
@conference {40162,
	title = {Artificial insemination of farmed feral goats with frozen-thawed semen},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {49},
	year = {1989},
	month = {Jan},
	pages = {171-174},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A trial was conducted over 2 years in which the comparative wool growth rates of wethers and dry, single and twin-rearing ewes were measured. The sheep were pasture fed according to 3 regimes of either continuous maintenance or alternating 3-monthly periods of either high or low plane and maintenance feeding. At any one time, groups of sheep were either gaining, maintaining or losing live weight. This paper reports preliminary analyses of the effects on wool growth of year, breed, sheep age and rearing status. Coopworths were consistently heavier than Romneys. As a result of practical constraints associated with the trial design, ewes which reared twins were lighter at the end of the trial than ewes which reared singles which were lighter than wethers and ewes which did not raise any lambs. Romneys grew more wool than Coopworths with no difference in wool production between wethers and ewes which did not rear a lamb. Overall, the clean wool growth rate of the dry sheep was a minimum of 7.2 g/d in July/August and a maximum of 12.5 g/d in November/December. Wool growth rates of the single and twin rearing ewes relative to the dry sheep (100) were 63 and 55 in July/August and 90 and 82 in November/December respectively. Wool growth rates after weaning did not differ between rearing status groups. The combined effect of these differential wool growth patterns on clean fleece weight of single and twin rearing ewes relative to the dry sheep (100) were 86 and 77 in December and 99 and 97 in May respectively. Despite the apparent large reduction in wool production associated with rearing lambs it is still economic at present prices for most farmers to run breeding ewes rather than dry sheep of the same breed.},
	issn = {1176-5283},
	author = {Moore RW and Dow BW and Staples LD}
}
@conference {40138,
	title = {Effect of Regulin implants on spring fertility, lactation and down growth of cashmere does},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {49},
	year = {1989},
	month = {Jan},
	pages = {39-42},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Ultrasonography has permitted close visualisation of follicular development in cattle and has revealed that three waves of follicles normally develop during the oestrous cycle. Follicle stimulating hormone is important for the recruitment of follicles but it is not known how the recruited follicles are selected to become dominant over other follicles and eventually to ovulate. Hypothalamic, pituitary and ovarian hormones are secreted and released episodically. During the luteal phase of the oestrous cycle, the negative feedback of progesterone prevents any rise in luteinising hormone (LH). As progesterone levels fall, LH increases, prompting an increase in oestradiol which triggers the ovulatory LH surge and behavioural oestrus. LH causes ovulation and luteinisation of follicular cells. Luteal phase progesterone may be responsible for later increases in prostaglandin F2a (PG)F2a, a luteolytic hormone in cattle and sheep which is transferred from the uterus, its site of synthesis, to the corpus luteum. Oestradiol and oxytocin, synthesised in the ovary, may be involved in regulation of uterine synthesis of PGF2a, hastening luteolysis. At this time it is not known how essential these two hormones are to the process of luteolysis. The discovery and synthesis of new ovarian hormones should permit superovulation to become a more exact and a less expensive procedure and for embryonic mortality to be reduced.},
	issn = {1176-5283},
	author = {Moore RW and Bigham ML and Staples LD}
}
@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 {40101,
	title = {Effects of melatonin on early breeding of F+ and ++ Booroola x Perendale and Romney ewes},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {48},
	year = {1988},
	month = {Jan},
	pages = {109-112},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Glenbrae and Broomfield strains of Corriedale sheep were developed over a period of 19 years by selectively breeding from animals that remained free from clinical footrot when deliberately exposed to natural infection. Recent studies have demonstrated relative advantages in these bloodlines during footrot outbreaks in terms of significantly reduced incidence and severity of infection compared to unselected Corriedales. Similar benefits have also occurred in commercial flocks when first cross offspring of Glenbrae and Broomfield rams were compared to offspring of traditional rams. Introduction to the industry of these apparent genetic gains in footrot resistance has been through 2 approaches. Firstly the Broomfield Corriedale Group Breeding Scheme was established in 1982 with 1420 Sheeplan ewes recorded in 5 flocks screened from an estimated 28,000 ewes. The objective is to breed rams for commercial use utilizing performance records and a footrot challenge prior to selection as 2- tooths. Secondly the Corriedale Sheep Society initiated a top-crossing programme mating 3 Glenbrae footrot resistant rams to 81 registered Corriedale ewes in 1986. Details of these 2 approaches are given.},
	issn = {1176-5283},
	author = {Moore RW and Miller CM and Dow BW and Staples LD}
}
