Sincronização do cio e inseminação artificial em ovelhas no Semiárido Nordestino.

Abstract

The aim of this study was to evaluated the use of the male effect on the synchronization of the estrus in sheep associated to a hormonal administration. The experiment was accomplished in the farm Barra do Riacho in the distrit of Afogados da Ingazeira, semiarid Area of Pernambuco. 90 females were used, with body score 2.5 to 3 (1 to 5), 4 teaser and 4 males of the Dorper breed, with proven fertility. The females were separate from physical and visual contact of males for a period of one month and they received concentrated ration twice a day. 3 experimental groups were formed with 30 sheeps each: G1 they had inserted sponges intravaginal impregnated with 50mg of progesterona of medroxiacetato (MAP), for a period of 14 days, in the twelveth day of permanence 0,5ml cloprostenol was applied, in the 14o day 250UI eCG intramuscular, was applied; G2 intravaginals sponges were inserted impregnated with 50mg MAP, for a period of 14 days, in the twelveth day of permanence 125μg of cloprostenol was applied and introduced two males, by a period of seven days; G3 without application of intravaginal sponges nor cloprostenol, males were introduced for a period of seven days. The verified result as for the synchronization of the estrus and fertility of all females, fertility of mated sheep and prolificity was: G1 100%, 80%, 80% and 1.3, G2 70%, 63%, 90.5 and 1,35, G3 36,6%, 36,6%, 1,4 and 100% respectively. It is concluded that, the association of intravaginal implant of progesterone and cloprostenol, associated with the male effect presents satisfactory results of synchronization and fertility.