Impact of Human Chorionic Gonadotropin and Prostaglandin F2α Treatment on Progesterone Concentration, Oestrus and Pregnancy Rate in Friesian Cows

The aim of the research was for evaluation human chorionic gonadotropin (hCG) hormone to improve fertility on Friesian cows. A total of 39 cows postpartum ages ranged between 46–96 months, weighing 440 – 560 kg are used. Cows were divided into three groups (13 cows in each). The first group was injected hCG at 0 day of oestrous, followed by 5 days with 3 ml PGF2α6, followed 1 days 3 ml PGF2α followed by 2 day injected hCG and timed artificial insemination (TAI). The second group (G2) was injected hCG at 0 day, followed by 5days with 3 ml PGF2α, followed 1 days 3 ml PGF2α followed by 2 day hCG, followed by 16-20h later with TAI. The thread group (G3) was injected hCG at 0 day, followed by 5 days PGF2α, followed 1 days 3 ml PGF2α followed by 2 day hCG followed by 16-20h later with TAI, followed by 5 days injected hCG. The pregnancy rate was much greater in G3 (76.92%) and G2 (69.23%) than in G1 (53.85%). Concentration of progesterone (P4) in G1 or G2 was considerably (P<0.01) decreased in pregnant than in non-pregnant cows at AI, although it was increased in pregnant than in non-pregnant cows at 7, 14, and 24 days after AI. And, not all cows had a considerable P4 concentration before to treatment. Economic evaluation, the cost of hCG at insemination was the lowest (L.E 232/animal), while the cost of hCG following a 5-day TAI technique was the highest (L.E 290/animal).