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1 August 2006 Calves Born from Anestrus Yaks (Poephagus grunniens L.) Subjected to Ovsynch and Superovulation Treatment
Mihir Sarkar, Sagarika Borah, Prithviraj Chakraborty, Bharat Deka, Babul Sharma, Binod Duttaborah, Sanjiv Borah, Kashyap Baruah, Kerekoppa Ramesha, Ramasamy Pourochottamne, Mukund Kataktakware, Buddhi Sarvanan, Dilip Sengupta, Sandip Das, Bukkaraya Samudram Prakash, Mohan Bhattacharya
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Abstract

An attempt was made to induce estrus and ovulation in eight anestrus yaks by use of the Ovsynch protocol. Six out of eight yaks were successfully induced into estrus, and ovulation occurred in all the responding yaks 1–2 days after the second GnRH administration. Out of the six animals that responded to the treatment, two mated naturally with yak bulls, and calves were obtained from them. The other four animals were further administered a superovulatory regimen of Folltropin (FSH-P). Following Folltropin and Ilerin (a PGF analog) treatment, the animals were subjected to natural insemination. Only one animal in which natural mating occurred was flushed non-surgically for embryo recovery 7 days post-insemination. Thereafter, all the donor animals were administered with Ilerin. After 48–72 h, they came into heat and mated naturally with yak bulls, and calves were obtained from them after expiration of the normal gestation period. Following superovulation, the average numbers of palpable corpora lutea in the right and left ovaries were 2.25±0.6 and 1.75±0.3, respectively. Three embryos were recovered by non-surgical flushing from a single animal. One embryo was transferred to a recipient yak, who produced one female calf after 258 days. This is the first report of production of a yak calf through embryo transfer-technology.

Mihir Sarkar, Sagarika Borah, Prithviraj Chakraborty, Bharat Deka, Babul Sharma, Binod Duttaborah, Sanjiv Borah, Kashyap Baruah, Kerekoppa Ramesha, Ramasamy Pourochottamne, Mukund Kataktakware, Buddhi Sarvanan, Dilip Sengupta, Sandip Das, Bukkaraya Samudram Prakash, and Mohan Bhattacharya "Calves Born from Anestrus Yaks (Poephagus grunniens L.) Subjected to Ovsynch and Superovulation Treatment," Zoological Science 23(8), 721-725, (1 August 2006). https://doi.org/10.2108/zsj.23.721
Received: 22 September 2005; Accepted: 1 April 2006; Published: 1 August 2006
KEYWORDS
embryo
estrus
Ovsynch
ovulation
superovulation
Yak
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