
%0 Journal Article
%A Fukui, Y 
%A Roberts, EM 
%T Fertility of ewes treated with prostaglandin F<sub>2&#945;</sub> and artificially inseminated at predetermined intervals thereafter
%J Australian Journal of Agricultural Research
%D 1977/10/01
%V 28
%N 5
%P 891-897
%K 
%R https://doi.org/10.1071/AR9770891
%U https://www.publish.csiro.au/paper/AR9770891 
%X An experiment was conducted to investigate the fertility rate in ewes inseminated with either fresh undiluted or frozen-thawed ram semen, without the use of vasectomized rams, at the first synchronized oestrus after a single intramuscular injection of 16 mg prostaglandin F2&#945; (PGF2&#945;). It was also investigated whether two injections of PGF2&#945; at an interval of 12 days would improve the degree of synchronization of oestrus and the subsequent fertility. The degree of synchronized oestrus with two injections was similar to that with a single injection (72&#37;v. 74&#37; respectively). Inseminations at 46 and 54 hr or at 70 and 78 hr after treatment showed fertility comparable with that from those inseminations at oestrus detected by vasectomized rams (50&#37; v. 45&#37; for fresh undiluted semen and 22&#37; v. 25&#37; for frozen-thawed semen respectively). Inseminations at 70 and 78 hr after treatment showed a much higher fertility rate for both fresh undiluted (62&#37; v. 39&#37; respectively) and frozen-thawed semen (39&#37; v. 9% respectively) than inseminations at 46 and 54 hr. Two injections of PGF2&#945; resulted in similar fertility rates in control ewes following insemination with either fresh undiluted semen (50&#37;) or frozen-thawed semen (22&#37;). 
