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Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 7(4): 301-305
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Zhaobing Gu1, Lin Li1, Huaming Mao1,2*

1Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China; 2Yunnan Provincial Key Laboratory of Animal Nutrition and Feed Science, Kunming 650201, China.

Abstract | The study investigated the efficiency of CIDR-PGF2a-based protocol under thermoneutral (spring) and heat stress (summer) conditions. Dehong dairy buffaloes (128) were utilized to analyze the effects of the intravaginal progesterone-releasing insert (i.e., controlled internal drug release [CIDR]) and prostaglandin F2a (PGF2a) injection on reproductive performance under high temperatures. Each buffalo received a CIDR with 1.38 g progesterone (day 0) and a 0.6 mg PGF2a injection on day 10 after CIDR insertion. The CIDR was removed on day 13 and then two artificial inseminations (AI) at 48 hr and 72 hr after the CIDR removal occurred. Average temperature-humidity index exceeding 72 during summer was greater than that in spring. Estrous rates of buffaloes were not significantly different between spring and summer. No difference in day 90 pregnancy/AI (pregnancy status at 90 d after AI) was found in multiparous buffaloes under thermoneutral and heat stress conditions; however, heifers (51.7%) showed greater day 90 pregnancy/AI in spring than in summer (39.6%) (p < 0.05). In total, buffalo day 90 pregnancy/AI in summer (34.1%) was lower than in spring (40.6%) (p <0.05). In conclusion, the administration of progesterone by CIDR and PGF2a injection improve estrous response and day 90 pregnancy/AI in summer.

Keywords | CIDR-PG, Day 90 pregnancy/AI, Dehong dairy buffalo, Heat stress, Thermoneutral condition