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Year :	2016
Tome :	167
Volume :	7-8
Pages :	211-215
Title :	Effects of equine chorionic gonadotropin (eCG) on the sexual behaviour and ovulatory characteristics of female african N'Dama cattle
Authors :	MWM OKOUYI, C. HANZEN
Summary :	This paper evaluated the effects of eCG on oestrus and ovulation in N'Dama heifers and cows synchronised by vaginal administration of progesterone (CIDR : Controlled Internal Drug Releasing Device) for seven days and a PGF2α injection two days after the end of treatment. The animals were randomly split into a non-treated control group (n=26) and four groups with increasing doses of eCG: 300 IU (n=25), 400 IU (n=24), 500 IU (n=23) and 600 IU (n=23), which were injected on the day of CIDR withdrawal. The animals were then followed (24 hours a day) for six days. Oestrus was defined by the time from first to last observed standing oestrus). Seven to ten days after the CIDR® was withdrawn, the animals were slaughtered, and their ovaries were examined to identify and count the number of follicular and/or luteal structures. The onset of heat was 48.6 ± 5.3 hours after eCG injection, and the average length of oestrus was 9.9 ± 2 hours. The eCG dosage had no significant effect on these two parameters. In contrast, the observed rate of oestrus was significantly (p<0.05) higher in animals that had been treated (70.8 to 84.0%) in comparison with animals that had not been treated (50%). Similarly, the ovulation rate was significantly (p<0.05) higher in treated animals (88.0 to 100%) than in untreated animals (73.1%). The percentage of animals that presented multiple ovulations increased significantly (p <0.001) with the dosage of eCG administered (4.5% to 36.4%).
Keywords :	N'Dama, equine Chorionic Gonadotropin, oestrus, ovulation
Correspondence :	C. HANZEN
Adress :	University of Liège, Faculty of Veterinary Medicine, Theriogenology of Production Animals Department, B42 Sart Tilman, B4000 Liège. [email protected]
Link :	pdf

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