Características da carcaça de ovinos Santa Inês terminados em pastejo e submetidos a diferentes níveis de suplementação.

Abstract

This experiment was developed in the Center of Health and Rural Technology (CHRT), of the Federal University of Campina Grande, Patos’s Campus - PB. It had the purpose of evaluating carcass characteristics of Santa Inês lambs. They were maintained in native pasture wiht Buffelgrass (Cenchrus ciliaris L cv Biloela) and submitted to different supplementation levels in the diet. Twenty-four animals were used, castrated males, averaging 15kg ± 1,44 of boby weight and average age of 75 days. The concentrate was constituted of cracked corn, soybean meal and mineral salt. When the animals of the treatment received diet with larger concentrate they reached 30kg of LW they were together with their pairs of the other treatments, they were submitted to 16 h fasting of solid diet and 12 hours of liquid diet. Soon after, they were weighed to check live weight at slaughter. The animals were slaughtered with hit in their head and with cut of the arteries carotids and jugular veins. The gastrointestinal tract was emptied and It was cleaned for the obtaining of empty body (EBW). After the separation of the components that didn’t constitute the carcass, it was obtained the hot carcass weight (HCW). It was used to estimate the hot carcass yield (HCY). The carcasses were cooling in cold camera for 5ºC during 24 hours and, in the end of this period, they were weighed to check the cold carcass weight (CCW), it was used to estimate the cold carcass yield (CCY). Soon after, the carcass was divided in courts (leg, loin, ribs blade and neck), they were weighed for calculation of its yield in relation to the weight of carcass. The used design was entirely randomized with three treatments and eight replicates. Among the treatments, there were significant differences (p<0,05) among the weight to the slaughter, the hot carcass weight, the cold carcass weight, the empty body weight, the hot carcass yield, the cold carcass yield and increase loin eye area, with the largest indexes obtained by the animals of the treatment 1,5%. In relation to the weight of the content gastrointestinal and biological yield, there wasn’t significant difference (p>0,05) among the treatments. The yield of leg, loin, rib and neck were similar among the treatments 1,0% and 1,5% of LW. The use of the supplementation in the diet of Santa Inês lambs is grazing, in the conditions of semiarid climate, makes possible to get lambs younger to slaughter and desirable characteristics of the carcass, such as: better yield, higher weight and compactness, increase loin eye area, less lose of weight in the cooling, and greater weight of retail cuts. According to the economical analysis it can be concluded that, if the objective will be to get lighter carcasses with around 7kg and with minimum level of fat doesn’t have necessity of supplementation with concentrate, but, if the objective will be to get the carcasses weighing from 10 kg to 12kg and with better level of finishing it’s recommended supplementation with 1,0 to 1.5% of the live weight with concentrate.