Características de carcaça de cordeiros da raça soinga alimentados com silagens da mucilagem do sisal em substituição à palma forrageira

Abstract

The effect of the substitution of forage palm by silage from the mucilage of pure sisal and corn and wheat sisal was evaluated in the diet of sheep on the carcass characteristics, weights and yields of commercial cuts. Twenty four four - month - old male sockeye sheep with mean initial weight of 19 ± 1.38 kg were distributed in 4 treatments and six replicates, and slaughtered after 74 days of feedlot, and the carcasses were refrigerated for 24 hours at ± 4 ° C, being sectioned in half carcasses after this period. The left half carcass was sectioned into six anatomical regions, causing the commercial cuts. A cross section was made, in the section between the 12th and 13th ribs, to measure the loins of the Longissimus dorsi muscle in the same muscle, using a digital caliper, the thickness of the fat was measured. The dry matter intake, mean daily gain, feed conversion, true body fat yield at slaughter, empty body weight, warm carcass weight and cold carcass weight, true yield, cold carcass yield, warm carcass yield showed significant difference with the replacement of the palm by the MUC, already among the treatments that the animals received pure MUC and added with MUCMI and MUCTRI increasing the weights and the yields, however it was not demonstrated significant difference for the variables cooling loss, subcutaneous fat thickness and area of the loin eye. In relation to the weight of the meat cuts, neck, loin, saw, ribs did not defer (P> 0.05) among themselves, except for the palette, leg, M.C.E.R that showed difference (P <0.05) among themselves. Regarding the cut yield, no substitution effect was observed (P> 0.05). The tissue composition showed a significant difference for the variables cooled leg, reconstituted leg, biceps femoris, other muscles and total muscles when replacing the forage palm with the other diets composed of MUC, MUCMI and MUCTRI, but there was no significant difference for the other variables tissue composition of the leg when hearing the substitution of feeding the animals with palm by pure mucilage and added with corn and wheat. In the tissue yield of the cuts, no significant difference was observed when hearing the replacement of the feed of the animals with palm by the pure mucilage and added with corn and wheat. Thus, it is recommended to substitute the forage palm when the mucilage is accompanied by additives, since it contributes to a better yield for all the variables when compared to the animals when they consumed pure mucilage in substitution of the forage palm.