Glicerina em dietas de alto concentrado para ovinos

Abstract

Two experiments were conducted to evaluate the intake, digestibility coefficients, ruminal pH, ammonia nitrogen, short-chain fatty acids, blood glucose, performance, water intake and feed conversion of feedlot lambs fed high concentrate consisting of: ground corn, soybean meal, soybean hulls, urea and mineral mixture. The amounts of glycerin included in the diets were: 0, 50, 100, 150 and 200 g / kg DM. The relationship roughage: concentrate diet was 25:75, and the source of roughage wassugar cane bagass.In experiment 1 were evaluated: consumption, digestibility, ruminal pH, ruminal ammonia nitrogen (NAR), short-chain fatty acids and blood glucose feedlot lamb, in which it were used five male sheep castrated rumen without defined breed, weighing 30,26 ± 3,12 kg, distributed in 5x5 Latin square design.The amount of glycerin included in the diets were: 0, 50, 100, 150 and 200 g / kg DM. The DM, CP, NDF and NDFac a quadratic effect (P <0.05), noting that in general, the highest values occurred around 100 g glycerol / kg DM. Linearly decreased (P <0,01) in intake of total carbohydrate and non-fiber carbohydrates with the inclusion of glycerin. Inclusions up to 200g of glycerin / kg DM did not influence (P <0,05) ruminal pH values, concentrations of ammonia nitrogen, blood glucose and digestibility of nutritive components. The concentrations of propionic acid presented a quadratic effect, increasing to 114, 9 g glycerol / kg DM (P <0 01).In experiment 2 were evaluated: average daily gain, feed conversion, blood glucose, consumption and dry matter digestibility of feedlot lambs fed high concentrate diets containing increasing amounts of glycerol. A total of 40 lambs uncastrated male, with a mean age of 4.5 months and an average initial weight of 22,26 ± 3,77, distributed in a randomized block design. Inclusions up to 200 g / kg DM did not influence (P> 0,05) average daily gain, feed conversion and dry matter intake. There was a linear decrease (P <0,01) in blood glucose levels with the inclusion of glycerin. Water consumption showed a quadratic effect (P <0,05), noting that the highest values around 100 g glycerol / kg DM. It was concluded that the inclusion of increasing amounts of glycerin influence on the consumption of nutritional components and it is recommended to 100 g of glycerin / kg DM without detrimental nutritional parameters and productive performance.