CARACTERÍSTICAS DE CARCAÇA DE CORDEIROS SANTA INÊS CONFINADOS COM NARASINA NA DIETA

Abstract

The objective was to evaluate carcass characteristics of Santa Inês lambs confined with narasin in the diet. The experiment was carried out in the confinement shed of the LAPECO do IF Goiano Campus Rio Verde. 24 lambs were used, 08 of which were males and 16 females, aged between 02 and 04 months. The experimental diets were the following: T1= Standard diet without inclusion of narasin (Nar); T2 = Standard diet + 6.5 ppm Nar; T3 = Standard diet + 13 ppm Nar and T4 = Standard diet + 19.5 ppm of Nar/MS ingested. The roughage:concentrate ratio was 10:90, with roughage corn silage and concentrate composed of soybean meal, whole corn grain and mineral salt. The experimental period was 55 days and then the animals, after solid fasting period of 16 hours, were weighed and sent to slaughter. The data were submitted to analysis of variance and the means were compared by the Tukey Test at the 5% level of significance. In the statistical program R (2021). in the income of carcass and body length there was no difference between sex, in which females obtained higher yields. There was no effect (p>0.05) of the different levels of narasin, nor sex effect or interaction between levels and sex for the variables: leg length; leg width; palette length; palette width and loin eye area. Carcass characteristics of Santa Inês lambs finished in high-grain feedlots were not influenced by the use of narasin.