Desempenho produtivo em ovinos Santa Inês alimentados com diferentes proporções de fenos de Capim Buffel (cenchrus ciliares l.) e de Jurema Preta (mimosa tenuiflora (willd.) poir.)

Abstract

The objective of this study was to evaluate the performance and carcass traits of Santa Inês sheep that were fed different proportions of buffel grass hay ( Cenchrus ciliaris L.) and jurema preta (Mimosa tenuiflora ( Willd.) Poir.)) in their roughage diet. We used 28 Santa Inês male sheep, 120 days old and initial live weight of 20 ± 2.49 kg. They were confined for 76 days, receiving 60 % roughage in the form of hay and 40 % concentrate. The experimental treatments were 100:0 % , 33:67 % , 67:33 % , 0:100 % Buffel Grass Hay ( FCB ) and Jurema Preta Hay (FJP ) , respectively, and fed in the morning and afternoon to allow 10% of leftovers. Diets were adjusted for a gain of 200 grams per day. The sheep were weighed every seven (7) days. During the performance experiment 12 animals were used for the digestibility trial for 21 days where 15 days were for adaptation and six for collection. The experimental design was completely randomized with four treatments and seven replicates and the data were subjected to analysis of variance and regression, always at the level of 5 % of probability. When the FCB was replaced by FJP in the massive portion of the diet, it contributed positively to performance and food ingestion. It is recommended to use up to 33.33, 30.63 , 25.00, 24.50 and 38.89 % for weight gain, conversion, feed efficiency, total weight gain and IMS%PV respectively to intake up to 36 , 23 , 36.25 , 39.38 , 38.14 and 36.90 % for MS; PB, EE, CHOT and NDT respectively , above these values , there was a negative effect on the performance and intake. In digestibility coefficient, when we increased the level of FJP, we noted linear decreasing effect for MS, PB, FDN, FDA, FDNcp, FDAcp, MO and CHOT. And a positive effect when we used up to 28.50; 21.62; 21.78 and 26.07 % for PA, PCQ, PCF and PCV respectively. It is recommended to replace the FCB by FJP between 24.50 to 38.89 % in bulky portion of the diet, which contributed positively to performance, intake and carcass yield. The same was not observed for digestibility which showed decreasing linear and quadratic effect when increased the level of FJP in the massive portion of the diet.