Induction of estrus in thyroidectomized-ovariectomized, nonlactating, holstein cows

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dc.contributor.author Stewat, R.E.
dc.contributor.author Mee, M.O.
dc.contributor.author Rettmer, I.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2011-05-20T15:52:06Z
dc.date.available 2011-05-20T15:52:06Z
dc.date.issued 2011-05-20
dc.identifier.uri http://hdl.handle.net/2097/9176
dc.description.abstract Low thyroid activity (hypothyroidism) has been reported to decrease sexual behavior associated with reproduction in several species. Using estradiol benzoate (EB) and progesterone (P ), we attempted to induce 4 estrus in hypothyroid cows. Thyroid glands (thyroidectomy) and ovaries (ovariectomy) were removed surgically from nonlactating and nonpregnant Holstein cows that were culled from the Kansas State University dairy herd. Eight cows were thyroidectomized and ovariectomized (THYOVEX) and another four cows were ovariectomized only (OVEX). Starting 9 hr after injection of EB, cows were continuously observed for estrus for 36 hr. Frequencies of mounting activity and standing behavior were recorded for each cow. The percentage showing standing estrus was greater in cows that had no thyroid glands or ovaries than in cows without ovaries (78 vs 31%). Manifestation of estrus was identical in cows treated with EB or EB+P (62%). Interval from 4 EB injection to onset of standing estrus, frequency of mounting activity, and duration of standing estrus were similar among treatment groups and unaffected by the type of hormonal treatment. Thyroidectomized cows can exhibit estrous behavior, which is similar to that in ovariectomized cows treated with EB or P +EB. en_US
dc.publisher Kansas Agricultural Experiment Station en_US
dc.relation.isPartOf Dairy Day, 1992 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 93-131-S en_US
dc.subject Thyroidectomy en_US
dc.subject Overiectomy en_US
dc.subject Estrous behavior en_US
dc.subject Cattle en_US
dc.title Induction of estrus in thyroidectomized-ovariectomized, nonlactating, holstein cows en_US
dc.type Conference paper en_US
dc.date.published 1992 en_US
dc.citation.epage 36 en_US
dc.citation.spage 34 en_US
dc.contributor.authoreid jss en_US

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