
%0 Journal Article
%A Robinson, TJ 
%T Fertility following synchronization of oestrus in the sheep with intravaginal sponges.  II. Effect of dose of progestagen and rate of absorption
%J Australian Journal of Agricultural Research
%D 1970/10/01
%V 21
%N 5
%P 783-792
%K 
%R https://doi.org/10.1071/AR9700783
%U https://www.publish.csiro.au/paper/AR9700783 
%X The effect on fertility of the amount of Cronolone (Searle) absorbed from intravaginal sponges and the method of artificial insemination was studied. A significant linear relationship exists between fertility and the amount absorbed in 16 days, over the range 1-10 mg. No such relationship can be demonstrated above this amount, and great variability and sensitivity to failure of fertility is shown at all dose levels. Insemination on a fixed time basis is superior to that on teasing. Of ewes inseminated on a time basis on the second or third day after withdrawal of sponges, 117 lambed of 237 treated (49.4%). Of ewes inseminated on detection of oestrus, 97 lambed of 196 in oestrus (49.5 %) of 249 treated (39 .O %). 
