
TY  - JOUR
A1  - Munro, RK 
A1  - Bertram, J 
T1  - Progesterone administered after insemination did not affect the fertility of cattle following a controlled breeding program
JF  - Australian Journal of Experimental Agriculture
JO  - Aust. J. Exp. Agric.
Y1  - 1990
VL  - 30
IS  - 2
SP  - 179
EP  - 181
KW  - 
UR  - https://doi.org/10.1071/EA9900179 
N2  - Oestrus and ovulation were induced in 112 suckled beef cows following intravaginal administration of progesterone (CIDR-B) and pregnant mare serum gonadotrophin (PMSG). Supplementary progesterone was provided during the induced luteal phase by re-treatment with CIDR-B from 6-21 or 10-21 days after initial insemination. A control group did not receive supplementary progesterone Supplementary progesterone did not affect the pregnancy rate to the initial insemination (59%). It did, however, tend to increase the proportion of non pregnant cows detected in oestrus 21-24 days after the initial insemination (17131 v. 3/14, P<0.05), but the fertility of treated and control cows inseminated at this second oestrus was not significantly different (30%). 
ER  -

