@conference {40415,
	title = {Comparison of growth, hogget fleece weight and reproductive traits of three sheep breeds from a flock selected for prolificacy and a Romney control flock},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {211-216},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The total glucose concentration of a medium changes with the  extent of serum supplementation, and this may have an effect on  embryonic development in vitro. In this study, 1- and 2-cell sheep  embryos (N+109) were cultured for approximately 120 hours at 39 C under  humidified 5\% CO2, 5\%)2 and 90\% N2 in Synthetic Oviduct Fluid medium  (SOF) supplemented with 20\% human serum and a total glucose concentration  of either 1.5 mM (modified-SOF) or 2.3 mM (unmodified-SOF). A slight  effect was observed on the proportion of embryos developing to at least  the expanded blastocyst stage (63\% and 48\% for modified-SOF and  unmodified-SOF, respectively, P<0.1). Twenty-eight blastocysts from  each treatment were selected and transferred to 28 synchronised, mature  ewes (2 blastocysts per ewe). Pregnancy and number of foetuses were  determined by ultrasonography 54 days after transfer. All ewes were  pregnant and survival of embryos was 82\% and 71\% for modified-SOF and  SOF, respectively. However, a high post-natal mortality rate was  observed (37\%), which was mostly attributed to a relatively high  birthweight of dead lambs (6.4 },
	issn = {1176-5283},
	author = {McEwan JC and Davis GH and Dodds KG and Fennessy PF and Clarke JN and Bruce GD and Hishon MG}
}
