title: Calves born from anestrus yaks (Poephagus grunniens L.) subjected to Ovsynch and superovulation treatment.
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(2alpha) 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.
authors.affiliation: National Research Centre on Yak (ICAR), Aunachal Pradesh, India. msarkar24@rediffmail.com
authors.forename: Mihir
authors.initials: M
authors.lastname: Sarkar
authors.forename: Sagarika
authors.initials: S
authors.lastname: Borah
authors.forename: Prithviraj
authors.initials: P
authors.lastname: Chakraborty
authors.forename: Bharat
authors.initials: B
authors.lastname: Deka
authors.forename: Babul
authors.initials: B
authors.lastname: Sharma
authors.forename: Binod
authors.initials: B
authors.lastname: Duttaborah
authors.forename: Sanjiv
authors.initials: S
authors.lastname: Borah
authors.forename: Kashyap
authors.initials: K
authors.lastname: Baruah
authors.forename: Kerekoppa
authors.initials: K
authors.lastname: Ramesha
authors.forename: Ramasamy
authors.initials: R
authors.lastname: Pourochottamne
authors.forename: Mukund
authors.initials: M
authors.lastname: Kataktakware
authors.forename: Buddhi
authors.initials: B
authors.lastname: Sarvanan
authors.forename: Dilip
authors.initials: D
authors.lastname: Sengupta
authors.forename: Sandip
authors.initials: S
authors.lastname: Das
authors.forename: Bukkaraya Samudram
authors.initials: BS
authors.lastname: Prakash
authors.forename: Mohan
authors.initials: M
authors.lastname: Bhattacharya
mesh_terms: D000780:Anestrus / Q000187:drug effects* / Q000502:physiology; D000818:Animals; D002417:Cattle / Q000196:embryology / Q000502:physiology; D015237:Dinoprost / Q000031:analogs & derivatives / Q000494:pharmacology; D004624:Embryo Transfer / Q000662:veterinary*; D004971:Estrus / Q000187:drug effects / Q000502:physiology; D005260:Female; D005300:Fertility Agents, Female / Q000494:pharmacology*; D005640:Follicle Stimulating Hormone / Q000494:pharmacology; D007987:Gonadotropin-Releasing Hormone / Q000494:pharmacology; D007315:Insemination, Artificial / Q000662:veterinary; D010062:Ovulation Induction / Q000379:methods / Q000662:veterinary; D011247:Pregnancy; D018873:Pregnancy Rate; D013480:Superovulation / Q000187:drug effects* / Q000502:physiology; D013997:Time Factors
chemical_list: D005300:Fertility Agents, Female; D007987:Gonadotropin-Releasing Hormone; D005640:Follicle Stimulating Hormone; D015237:Dinoprost