
%0 Journal Article
%A Fletcher, IC 
%T Effects of nutrition, liveweight, and season on the incidence of twin ovulation in South Australian strong-wool Merino ewes
%J Australian Journal of Agricultural Research
%D 1971/04/01
%V 22
%N 2
%P 321-330
%K 
%R https://doi.org/10.1071/AR9710321
%U https://www.publish.csiro.au/paper/AR9710321 
%X The effects of nutrition on the incidence of twin ovulation in strong-wool Merino ewes were studied at two seasons. Liveweight at the time of ovulation was the important determinant of twinning rate. Over the liveweight range 42-57 kg, the incidence of twin ovulation increased by about 2 . 5 % for each 1 kg increase in liveweight at ovulation due to variation in recent nutrition, and by about 1.3 % for each 1 kg of liveweight at ovulation due to inherent variation in liveweight. These relationships did not vary significantly between January and April. The incidence of twin ovulation was not enhanced by a state of increasing liveweight before ovulation ('flushing'), and did not vary significantly between January and April. 
