Document Type : Original Article
Authors
1
Animal Production Research Institute, Agricultural Research Center, Sakha
2
Animal Production Research Institute, Agricultural Research Center, Giza, Egypt
3
Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt.
4
Animal Production Research Institute (APRI), Agricultural Research Center (ARC), Ministry of Agriculture, Egypt
5
Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt.
6
department of animal production, fac. of agric., kafrelsheikh univ.
Abstract
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).
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