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Báo cáo khoa học: "Luteal lifespan and fertility after estrus synchronization in goats"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Luteal lifespan and fertility after estrus synchronization in goats | J. Vet. Sci. 2008 9 1 95-101 JOURNAL OF Veterinary Science Luteal lifespan and fertility after estrus synchronization in goats 1 2 .2 3 .3 Lu Meng Chao Koji Takayama Yoshitaka Nakanishi Katsumi Hamana Mitsuhiro Takagi Chikara Kubota3 Toshiyuki Kojima3 1The United Graduate School of Veterinary Sciences Yamaguchi University Yamaguchi 743-8515 Japan 2Laboratory of Animal Behavior Management and 3Laboratory of Theriogenology Kagoshima University Kagoshima 890-0065 Japan The present experiment aims to examine the efficiency of estrus synchronization using progesterone and equine chorionic gonadotrophin eCG and to look at luteal function. During the non-breeding and breeding season 5 adult female Korean native goats were injected intramuscularly with 2.5 ml of physiological saline as the control. A progesterone impregnated intravaginal sponge was then kept in the same goats for 10 days followed after a week by an intramuscular injection of 500 IU eCG. Five adult female Nubian goats were mated with a fertile buck during the non-breeding season. During the non-breeding season 2 of the 5 goats showed a normal estrous cycle ranging from 18 to 21 days and 3 a short estrous cycle ranging from 3 to 6 days . During the breeding season the equivalent figures were 1 and 2. The major axes of the corpus luteum CL were measured by means of calipers built into the ultrasonography system and the concentrations of plasma progesterone P4 were determined by double antibody radioimmunoassay. The mean major axes of the CL in goats showing the short cycle 6.1 0.5 mm was significantly smaller than in those showing the normal cycle 8.9 0.5 mm p 0.01 and also the value of P4 in goats showing the short cycle 4.2 2.1 ng ml was significantly lower than for those showing the normal cycle 10.3 4.3 ng ml p 0.05 at day 3 following ovulation. Three out of 5 Nubian goats became pregnant but only one goat carried to full term. The present experiment indicated that a combination of progesterone and eCG .