Glicerina bruta na alimentação de cordeiros pantaneiros confinados

Abstract

The objective of the study was to evaluate the economic viability, performance, biometrics mesurements and carcass of feedlot lambs fed diets with increasing proportions of crude glycerin replacing corn. For this were used 24 lambs uncastrated of the genetic grouping "Pantaneiro", with 90 days of age and body weight of 20 kg. The experiment was conducted in a completely randomized design with four treatments (proportions) and six repetitions. The treatments were: 0, 2.5, 5.0 and 7.5% crude glycerin inclusion in the diet dry matter substituted corn. The performance measures evaluated were: dry matter intake, organic matter and protein in addition to weight gain and feed conversion. The biometric measurements were: body length, heart girth, rump width, hip height, width and height of the anterior chest. The morphometric measurements of carcass were: carcass external length, carcass internal length, leg length, leg width, depth, leg, chest depth, conformation, state of greasing and carcass fat thickness. When the group reached the body condition score of 2.5 (normal) to 3.0 (slightly fat), the animals were slaughtered. Decreased linearly levels of crude glycerin on dry matter intake 1.20 to 1.01 kg/day and organic matter 1.13 to 0.94 kg/day and quadratic effect on crude protein intake 1.16 to 0.93 kg/day and crude protein on the percentage of body weight of 3.96 to 3.38% and a linear effect to feed conversion of 5.30 to 4.41. There were no differences in body measurements and compactness. Therefore, the inclusion of crude glycerin containing 39.40% glycerol in diets for finishing lambs at levels up to 7.5% of the diet dry matter, reduced feed conversion and decreases the cost of food.