Progesterona plasm????tica e fertilidade de f???ameas caprinas submetidas ???? sincroniza???§???￡o do estro com prostaglandina F2???±

摘要

Plasmatic progesterone concentrations were evaluated during the synchronization protocol with two doses of 22.5??g of Prostaglandin F2?±, 10 -day interval, and the conception rate of females in accordance to the reply to the protocol. Twenty-three female goats and two sexually mature Toggenburg bucks were used. Blood was sampled on day 0 (1 st PGF2?± injection), and on the following days 5, 10 (2 nd PGF2?± injection), 15, 20, and 33. The positive reply to the PGF2?± w as determined when the progesterone concentrations fell to values below 1.5ng/m L at days 5 and 15. The females were divided in three groups: Group I: females that responded to the two PGF2?± applications; Group II: females that responded only to the second application; Group III: females that responded the first application, did not respond to the second application, were inseminated but did not conceive. The presence of a functional corpus luteum at the moment of the applications determined the reply to the protocol. There was no difference in the conception rates between females that responded to the two PGF2 ?± applications or responded only to the second application.