Performance of lambs fed with crude glycerin diets
The objective of this trial was to evaluate the effect of total corn replacement by crude glycerine (CG) on performance of feedlot lambs. Forty Santa Ines intact males lambs were used with initial BW of 22.9 ± 4.10 kg, assigned in a completely randomized block. Diets consisted of Tifton-85 hay, corn, crude glycerin (83 % glycerol), corn gluten meal, corn oil, urea, sunflower meal, soybean hulls and mineral. The diets presented 18 % of roughage and 82 % of concentrate. Five treatments were used: 0 % CG, 7.5 % CG, 15 % CG, 22.5 % CG and 30 % CG on dry matter basis. The animals were housed in individual pens with free access to water. The feed intake of animals were adjusted to ensuring 10 % daily feed leftovers (ad libitum). The diets were offered twice daily at 0700 and 1600 h with 50 % of total in each meal. Weekly before feeding, the animals were weighed to evaluate of BW gain. The DMI, days in feedlot, average daily gain (ADG) and feed efficiency (FE) were calculated at the end of the experiment. The data were analysed using the MIXED procedure of SAS and the treatments were compared using orthogonal contrasts (linear and quadratic) considering 5 % significance level. There was no difference treatments among the variables measured (P > 0.05). On average, the animals presented 73 days in feedlot and 37.85 ± 1.42 kg final BW. The DMI in average was 1.35 kg day-1, 0.21 kg day-1 of ADG and 0.15 kg of FE (kg of gain per kg of DMI). These results indicated that the use of the diets containing high concentrations of glycerin did not affect negatively the dry matter intake and animal performance.
Keywords: byproducts, feed efficiency, feedlot