Desempenho reprodutivo de ovelhas alimentadas com dietas contendo diferentes níveis de energia no terço inicial da prenhez
Alternative titleReproductive performance of ewes fed with diets containing different levels of energy in the early pregnancy
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After estrus synchronization and breeding, 120 Santa Inês ewes, were distributed in four treatments Total Digestible Nutrients (TDN): 59.68%; 66.28%; 72.93%; and 79.39%., using total feed, from 0 to 50 days of pregnancy, to evaluate the pregnancy rate in function of the levels of energy in diet and glucose, as well as embryo loss in function of body condition (BC) and glucose level. On breeding day and for each 10 days, five mL of blood sample were collected to immediate determination of glucose and to dose progesterone. From 25° day after breeding, ultra-sound exams were realized, to pregnancy accompaniment, to evaluate embryo loss. The embryo loss rate was correlated with the energy levels of the treatments and glucose level and, before the day 20, the pregnancy was confirmed by the blood progesterone level. The female that had more than one ng/mL were considered pregnant at day 20. The embryo loss were not affected (P>0.05) by the glucose rate in the ewes on the day of breeding. The pregnant rate were not affected (P<0.05) by BC of the ewes in the moment of breeding, with a higher rate of pregnancy to the ewes with BC = 3. The glucose gets low with the weight and BC gain, with the heavy ewes and in better BC with high probability of embryo loss. There was a linear weigh gain in the ewes, from 0 to 50 days after breeding, in function of the increase in energy feed level. It's recommended to breed ewes with a higher glucose rate, BC near to three points and diet with 59.68% TDN, in the 50 first days of pregnancy.