Glicerina na alimentação de ovinos confinados

Abstract

This study aimed to evaluate the inclusion of glycerin in sheep feeding mongrel in the finishing phase of the intake, digestibility of nutrients, ruminal fermentation and animal performance. Two experiments were conducted to evaluate the inclusion of glycerin in animal nutrition: The first experiment to evaluate animal performance (0, 7, 14, 21, and 28% of dry matter) and the second experiment to evaluate intake and ruminal parameters cannulated sheep rumen (0, 10, 20, and 30% of MS). The experiments were performed in sheep breeding sector of the Experimental Farm UFMT in Santo Antônio do Leverger - MT. In the first experiment were used 40 lambs mongrel with an average weight of 21.71 ± 1.39 kg, distributed in a randomized block design with five treatments (0, 7, 14, 21, and 28% glycerin in MS diet) and four blocks. We evaluated the effect of the inclusion of glycerin on intake, digestibility of nutrients, weight gain and feed conversion. There was no effect (P> 0.05) of glycerin levels on intake of dry matter (DM), crude protein (CP), organic matter (OM), neutral detergent fiber (NDF) and ether extract (EE). The consumption of non-fiber carbohydrates (NFC) was linearly reduced (P <0.05) by glycerol levels in the diet. The DM and CP digestibility coefficients were not affected by the inclusion of glycerin in the diet, and had averages of 62.68 and 58.77%, respectively. There was a quadratic effect for the digestibility of EE, the higher digestibility being (76%) observed in the diet containing 21% glycerol in its composition. There was no effect of glycerin levels on the final body weight and the average total gain, with average values of 34.26 ± 1.84 kg and 17 ± 0.01, respectively. In the second experiment four sheep mixed breed, neutered male adult with average body weight of 35.02 ± 4.08 kg, rumen, were kept in individual stalls of 4.06 m2 area, in a latin square design, 4X4. the intake and digestibility were measured, pH, glucose and ruminal ammonia nitrogen. The daily intake of DM and CP showed linear reduction (P <0.05) with the highest values observed for the next additions to 10%. EE intake increased linearly, while the consumption of CNF and CT were reduced with the inclusion of glycerin. The ruminal pH values did not differ between the glycerol inclusion levels, with values above 6.0. Whereas the glycerin levels did not affect the intake and digestibility of nutrients and therefore the production performance makes it possible to add it to the level of 28% DM of the diet of lambs in confinement. In the second experiment, the inclusion of glycerin in feedlot sheep diet influenced DM intake and digestibility of nutrients, except for EE, but did not influence the results of pH, ruminal ammonia and blood glucose.