Efficiency of intravulval lip route of prostaglandin F2α administration on estrus synchronization in dairy cattle

الملخص EN

Estrus was synchronized in dairy cattle using the synthetic prostaglandin Fza (PG) analog Estrumate (Coopers Animal Health Ltd., Berkhamsed, England, UK; 250 Jig/ml of cloprostenol).

PG was administered by two routes at two different doses, 500 jig by im route (control) and 125 ng by intravuivai lip (ivu) route (treatment).

٨١١ animals were bred by artificial insemination (AI) to detected estrus using the am-pm breeding rule (BR).

First service conception rate (FSCR) for لاه dairy cows and heifers was 70% for the control and 54% for the treatment groups (P> 0.05).

Tte FSCR was also not different (P>0.05) between Holstein (HOL) and Australian Milking Zebu (AMZ) breeds (HOL 52% and AMZ 78%).

Moreover, all the animals in this study were confirmed pregnant by the end of die breeding season.

In conclusion, dairy cows and heifers can be successfiilly synchronized using only 25ل fig of cloprostenol without impairing fertility.

This dose corresponds to only one fourth of die recommended dose of 500 ng of cloprostenol by die manufacturer.