Características da carcaça e composição tecidual da carne cordeiros confinados com o uso de dietas de alto grão

Abstract

This study aimed to evaluate the effect of using different high-grain diets on the carcass characteristics and tissue composition of the meat of feedlot-finished lambs. Thirty-two male castrated Texel lambs born from single births and weaned at approximately 50 days of age were allotted to treatments that consisted of different unprocessed grains, as follows: corn grain, white oat grain, black oat grain, or grain of rice in the husk. The animals were slaughtered upon reaching the pre-established slaughter weight of 32 kg, which corresponds to 60% of the mature weight of their mothers. Lambs fed the high-corn grain diet had higher weights and yields of hot and cold carcass and larger loin-eye areas than those finished in the feedlot receiving high-grain diets based on white oat, black oat, or rice in the husk. Additionally, they had a higher degree of fatness and a thicker subcutaneous fat layer at slaughter, which lead to decreased cooler shrink loss. The neck, shoulder, ribs, and leg cuts were heavier in lambs fed the high-corn grain diet. By contrast, these lambs had a lower proportion of leg, more rib, and higher meat fat content, which may be undesirable for the consumer market. The use of high-corn grain diets, in comparison with high-grain diets based on black oat, white oat, and rice in the husk, may be recommended for finishing lambs in the feedlot when they are slaughtered at similar weights.

Características de carcaça e dos componentes não carcaça de cordeiros terminados com diferentes níveis de resíduo de pré-limpeza de soja como alimento fibroso

“…The average REA was 16.5 cm², a value consistent with the results observed by Carvalho et al (2017), who reported 15.96 cm². These results are higher than those found in studies by Bernardes et al (2018), Pires et al (2006), and Turino et al (2007), who described 13.81, 11.22, and 12.27 cm², respectively, despite the similar characteristics of the animals in comparison to those in the present study.…”