Desempenho e características de carcaça de ovinos recebendo dietas com feno de Jurema preta (Mimosa tenuiflora (WILD.) POIR.) como fonte de tanino.

Abstract

The objective of this study was to evaluate the performance of Santa Inês sheep fed with different proportions of inclusion of Jurema Preta hay (FJP) in the voluminous portion of the sheep diet. Twenty four non - castrated Santa Ines male lambs with initial live weight of 27.25 ± 3.32 kg were distributed in four treatments with six replicates that were confined for 72 days. They received 50% of bulky hay and 50% of concentrated hay. The experimental treatments were 0 (0.11% total tannins - TT), 12.5 (0.87% TT); 25 (1.61% TT) and 37.5% (2.41% TT) for inclusion of Jurema Preta hay in the bulky portion of the diet fed in the morning and afternoon shifts to allow a 10% surplus. The diets were adjusted to a gain of 200 grams per day. The sheep were weighed every 15 days. During the performance experiment, 12 sheep were used for the 18-day digestibility test, 13 days of adaptation and 5 days of collection. The experimental design was a completely randomized block design with four treatments and six replicates. Data were submitted to analysis of variance and regression, at a 5% probability level. The best results for dry matter intake, obtained through the equations, were the levels of 28.21; 31.75 and 31.5% inclusion of FJP for IMS (g/kg0.75), (g/kgPV) and (% PV), respectively. Food efficiency was better in the treatment without inclusion of FJP. The digestibility coefficient of MS, FDN, FDA, MO, EE, CHOT, CNF, NDT and EB was not influenced by the inclusion of FJP in the diet. There was no significant effect of FJP inclusion in the diet. There was no significant effect of the inclusion of FJP for both PPR and finishing. The inclusion of up to 37.5% did not affect sheep weight gain. The addition of tannin did not influence the development of the organs. The increase of tannin in the diets presented a positive linear relationship with the mesenteric fat, whereas the inguinal, pelvic and perirenal fat had no relation with tannin. Any level of FJP inclusion may be recommended for lambs weighing between 33 and 36 kg with cold carcass yields between 39 and 44%. The characteristics of the carcass components and non-carcass constituents are not related to the tannin content of the jurema preta in the sheep diet