Fertility following synchronization of oestrus in the sheep with intravaginal sponges. II. Effect of dose of progestagen and rate of absorption
1970 ◽
Vol 21
(5)
◽
pp. 783
◽
Keyword(s):
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 %).
1981 ◽
Vol 96
(1)
◽
pp. 243-245
◽
1970 ◽
Vol 21
(5)
◽
pp. 793
◽
Keyword(s):
1962 ◽
Vol 13
(6)
◽
pp. 1137
◽
Keyword(s):