Assessment of superovulatory responses in terms of palpable corpora lutea and embryo recovery using plasma progesterone in yaks (Poephagus grunniens L.).
Plasma progesterone profiles were used to assess superovulatory responses in cyclic yaks (n=10) in terms of the number of ovulations and the number of embryos recovered. The animals were synchronized into oestrus following Ovsynch treatment. All the animals received a total of 200 mg Folltropin divided into morning and evening and spread over 4 days, beginning on day 10 of the oestrus cycle (day of expected oestrus=day 0). Plasma samples for progesterone estimation were collected daily starting from the day of expected synchronized oestrus to the day of flushing. All the animals were palpated per rectum on the day of flushing in order to record the number of corpora lutea. Of an estimated 27 ovulations from the nine yaks, only 16 embryos were recovered. Plasma progesterone profiles from individual yaks suggested that a poor superovulatory response in terms of embryo recovery in some animals was caused by the lysis of corpora lutea before flushing which was carried out 7 days after superovulatory oestrus. It was suggested that flushing 5 days post superovulatory oestrus could improve the superovulatory response in this species.
Sarkar
M
M
National Research Center on Yak, Dirang, Arunachal Pradesh 790101, India. msarkar24@gmail.com
Chakraborty
P
P
Sharma
B C
BC
Deka
B C
BC
Duttaborah
B K
BK
Mohanty
T K
TK
Prakash
B S
BS
D000818:Animals; D002417:Cattle / Q000502:physiology*; D003338:Corpus Luteum / Q000502:physiology*; D015237:Dinoprost / Q000494:pharmacology; D004624:Embryo Transfer / Q000662:veterinary*; D004971:Estrus / Q000187:drug effects; D005260:Female; D005300:Fertility Agents, Female / Q000494:pharmacology; D005640:Follicle Stimulating Hormone / Q000494:pharmacology; D011247:Pregnancy; D011374:Progesterone / Q000097:blood*; D013480:Superovulation / Q000187:drug effects*
D005300:Fertility Agents, Female; D011374:Progesterone; D005640:Follicle Stimulating Hormone; D015237:Dinoprost