@conference {39872,
	title = {Effect of season on ovarian and pituitary activity in cows},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {44},
	year = {1984},
	month = {Jan},
	pages = {19-20},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {One hundred and four ewe lambs born in 1980 to either ewes that had been immunised against steroid hormones or untreated control ewes were retained for study of their subsequent growth and reproductive performance. There was no significant effect of dam immunisation on growth rate or reproductive performance as hoggets, 2-tooths or 4- tooths. Dam breed (Coopworth or Romney) was the major factor influencing reproductive performance. Mean lamb birth weight was 3.7 kg, weaning weight 18.7 kg, hogget mating weight 40.0 kg, 2-tooth mating weight 54.4 kg and 4-tooth mating weight 60.4 kg. At 9 months of age 83\% had exhibited oestrus and their ovulation rate was 1.08, as 2- tooths, 96\% mated in the first cycle with an ovulation rate of 1.68 and a conception rate of 80\% to first service. They had a lamb drop of 1.49 lambs born/ewe joined and weaned 1.35 lambs/ewe joined. The respective figures as 4-tooths were 98\%, 1.8, 85\%, 1.43 and 1.34. These data indicate that immunisation of ewes against steroid hormones has no adverse effects on the performance of their progeny.},
	issn = {1176-5283},
	author = {McNatty KP and Heath D and Lun S and Henderson KM and Hudson N and Gibb M and McDiarmid J and Montgomery GW and Thurley DC}
}
@conference {39758,
	title = {Induction of cyclical ovarian activity in seasonally anoestrous Romney ewes: studies with exogenous GnRH or LH},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {42},
	year = {1982},
	month = {Jan},
	pages = {21-24},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Groups of high and low fecundity Booroola x Romney (B x R) and Romney (R) two-tooth ewes grazed a pasture containing 85\% {\textquoteright}Grasslands Pawera{\textquoteright} red clover for 10 days; similar groups of ewes grazed ryegrass- white clover control pastures. Oestrus and ovulation were synchronised in all ewes to occur during the last 5 days of grazing. Pawera leaf material contained 0.7\% formononetin and the pasture was highly oestrogenic to sheep (>40 },
	issn = {1176-5283},
	author = {McNatty KP and Ball K and Hudson N and Gibb M and Thurley DC}
}
