@conference {40391,
	title = {The use of farm computers in animal management},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {115-118},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A dose-response curve for ovulation rate in Merino ewes  homozygous for Booroola FecB gene was generated by injecting PMSG at  dose rates increasing from 3300-1200iu in 100iu increments (n=8-13 per  group). PMSG was administered, at a concentration of 1000iu/ml in a  saline carrier, as a single injection 15 days after the withdrawal of  intravaginal progestagen sponges. An additional 20 control ewes were  injected with 1ml of saline.   The mean lifetime ovulation rate (LO) was calculated for each ewe from  data collected for up to three years prior to the study. In individual  ewes, a "response" to PMSG was defined as an ovulation rate at least 4  standard deviations (flock mean SD 0.87) greater than LO. Using this  arbitrary value, no animals responded at doses below 500iu and less than  50\% responded at 500 and 600iu. Above 800iu 75-100\% of ewes in each  treatment group responded. When log ovulation rate was regressed  against dose of PMSG there was a highly significant dose-response  (P<0.001, RSD 0.512).   Using a subjective assessment of changes in ovarian morphology it was  observed that >/=70\% of ewes given 1000iu or more of PMSG showed over-  stimulation of one or both ovaries. There was no apparent carry-over  effect of PMSG at the oestrous cycle following treatment.  },
	issn = {1176-5283},
	author = {Nuthall PL}
}
