
TY  - JOUR
A1  - Robinson, TJ 
T1  - Fertility following synchronization of oestrus in the sheep with intravaginal sponges.  II. Effect of dose of progestagen and rate of absorption
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 1970
VL  - 21
IS  - 5
SP  - 783
EP  - 792
KW  - 
UR  - https://doi.org/10.1071/AR9700783 
N2  - 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 %). 
ER  -

