Periódicos Brasileiros em Medicina Veterinária e Zootecnia

p. 2019-2032

Prediction of body chemical composition of Morada Nova ram lambs using the composition of ribs section between 9th and 11th

Roberto Góes Ferreira Costa, MarcusSales Pereira, ElzâniaPereira Pinto, AndréaMarcos de Azevêdo Silva, AderbalNunes de Medeiros, AriosvaldoYurika Mizubuti, IvoneLuiz de Azambuja Ribeiro, EdsonCláudia Nascimento Campos, AnaRenata Figueiredo Gadelha, CarlaLopes Oliveira, Ronaldo

The determination of the chemical composition of the body and carcass is important in nutritional and growth regulation studies. The purpose of this study was to develop equations to predict the chemical composition of the body and carcass using the chemical composition of a section from 9-11th rib in Morada Nova lambs. Forty-eight Morada Nova lambs with an initial weight of 12.05 ± 1.81 kg, were used. Eight animals were slaughtered at the beginning of the trial as a reference group in order to estimate the initial empty body weight and body composition. The remaining animals were assigned to a randomized block design with eight replications per block and five diets with increasing metabolizable energy contents (0.96, 1.28, 1.72, 2.18, and 2.62 Mcal/kg of dry matter). Animals were slaughtered when the mean of body weight of the group reached 25 kg. Body chemical composition was determined by evaluating the composition of the right half of the carcass, as well as, by using a sample between the 911th ribs (the HH section) from the left half of the carcass. According to Pearsons correlation coefficient, the use of the HH section precisely predicted the percentages of protein (r = 0.89), ether extract (r = 0.81) and minerals (r = 0.83). Equations were developed to estimate the percentage of protein, ether extract, ash in the carcass from the following components in the HH section

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