CARACTERÍSTICAS DE CARCAÇA DE CORDEIROS SANTA INÊS TERMINADOS EM CONFINAMENTO COM ADIÇÃO DE NARASINA NA DIETA

Abstract

The carcass characteristics of Santa Inês lambs finished in feedlot with addition of narasin in the diet were evaluated. The experiment was carried out in the Goat and Sheep sector of the IFGoiano Campus Rio Verde. The sheep were confined in individual stalls with an area of ​​2.8 m², covered, paved floor, equipped with feeders and drinkers. 16 animals were used, 08 males and 08 females aged approximately 03 and 05 months, with an average initial live weight of 17.41 kg. The diets had a roughage:concentrate ratio of 30:70, in which the roughage used was Tiffton 85 hay and the concentrate was soybean meal, whole corn grain and 1% mineral mixture. The treatments were: T1=Standard diet, without inclusion of narasin; T2=Standard diet + 6.5 ppm narasin/kg DM; T3=Standard diet + 13 ppm narasin/kg DM and T4=Standard diet + 19.5 ppm narasin/kg DM. The experimental period was 55 days, after an adaptation period of 07 days. The lambs were weighed at the beginning and at the end of the experiment, after being submitted to a solid fasting of 16 hours. After the animals were slaughtered, the carcasses were weighed and data collected. Statistical analyzes were performed using the R software version 4.2.1 (2022), using the F test at 5%. The variables hot carcass yield, loin eye area; carcass, leg and shoulder lengths; leg and shoulder width were not influenced by narasin addition levels. The carcass characteristics of confined Santa Inês lambs were not influenced by the use of narasin.