AL-Qadisiyah Journal of Veterinary Medicine Sciences

Abstract

Uses several hormones to induce estrus in local post – partum cows


Al - Jawad H . J .
Theriogenology Department of Coll . of
Vet . Med . Univ . of Al- Qadissya

ABSTRACT
This study was conducted on (40 ) cows as individual cases , which had estrus failure after (45) days post – partum . The cows divided in (4) groups and each group had (10) cows . First group injected by estradiol hormone , the second injected by progesterone , the third injected by (PMSG) and the fourth group injected by (GnRH) hormone for induced estrus cycle after birth. The results showed that high ratio (80% ) to that treatment with (GnRH) hormone , and the next ( PMSG) hormone ( 60% ) and the low ratio by used progesterone ( 40 % ) , on the other hand the uses of estrogen recorded high ratio ( 70 % ) also and you noticed the external estrus signs but without ovulation . This study showed that the best hormone for induced estrus after ( 45 ) days of birth was ( GnRH) .