VGO-0215
QUESTION
Superovulation treatments in cattle are usually started on day 08-10 of estrus because?
OPTIONS
(A) Corpus luteum is fully formed at this time.
(B) Follicles have entered atresia.
(C) The second follicular wave emerges at this time and follicles responsive to exogenous gonadotropins are present.
(D) Cows are docile at this time.
ANSWER
(C) The second follicular wave emerges at this time and follicles responsive to exogenous gonadotropins are present.
EXPLANATION
Starting conventional bovine superovulation around cycle days 8 to 10 targets emergence of a new follicular wave, often the second wave, when a recruitable group of follicles can respond to exogenous gonadotropins. A mature corpus luteum provides the hormonal background but is not the main reason for that timing. Follicular atresia and animal docility do not explain the intended stimulation window.
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Veterinary Gynaecology and Obstetrics · 240 Questions