Induction of estrus during the non-breeding season in Egyptian Baladi goats.
The induction of estrus during the non-breeding season was investigated in 100 Egyptian Baladi goats (Capra hircus). All animals assigned to treatments had low progesterone concentrations (<0.5 ng/ml) tested 2 times 10 days apart to confirm anestrous condition. Animals were assigned to three experimental groups. A group of animals received subcutaneous norgestomet ear implant for 11 days and a single i.m. injection of PGF2alpha 24 hr before implant removal (group I; n=40). Second group of animals received subcutaneous norgestomet ear implant for 11 days and a single i.m. injection of PGF2alpha 24 hr before implant removal and gonadotropin releasing hormone 24 hr after implant removal (group II; n=40). Third group of animals received no treatment (control group; n=20). The percentage of goats that showed estrous behavior during the first 72 hr after implant removal was 77.5, 85.0% and 10.0% in group I, group II and control group, respectively. The fertility rate was 57.5, 70.0% and 10.0% in group I, group II and control group, respectively. In conclusion, estrus can be induced in seasonally anestrous Egyptian Baladi goats using norgestomet and PGF2alpha and the injection of GnRH 24 hr after norgestomet implant removal synchronized ovulation in a higher percentage of goats.
Medan
Mohamed
M
Department of Theriogenology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt.
Shalaby
Abdel-Hamid
AH
Sharawy
Sayed
S
Watanabe
Gen
G
Taya
Kazuyoshi
K
D000818:Animals; D015237:Dinoprost / Q000494:pharmacology*; D005260:Female; D005298:Fertility; D006041:Goats / Q000502:physiology*; D007987:Gonadotropin-Releasing Hormone / Q000494:pharmacology; D008297:Male; D010062:Ovulation Induction / Q000379:methods / Q000662:veterinary*; D011282:Pregnenediones / Q000494:pharmacology*; D045167:Progesterone Congeners / Q000494:pharmacology*; D011897:Random Allocation
D011282:Pregnenediones; D045167:Progesterone Congeners; D007987:Gonadotropin-Releasing Hormone; C100284:norgestomet; D015237:Dinoprost