Carcass quality, parts and tissue development of lambs finished in three systems

Abstract

RESUMO -O objetivo neste estudo foi avaliar o efeito do sistema de terminação em pastagem natural e do sexo sobre a qualidade de carcaça, o desenvolvimento regional e tecidual de cordeiros. Foram utilizados 45 machos não-castrados e 45 fêmeas, distribuídos inteiramente ao acaso em três sistemas de terminação: cordeiro com a mãe, mantido em pastagem; cordeiro desmamado mantido em pastagem; cordeiro desmamado mantido em pastagem e suplementado com casca do grão de soja a 1% peso corporal. O critério de abate foi a condição corporal, entre dois e três. As características da carcaça e componentes regionais foram influenciadas pelo sexo. O sistema de terminação com suplementação promoveu maior rendimento de carcaça e comprimento da perna. A composição tecidual foi afetada apenas pelo sexo, de modo que os machos apresentaram maior massa muscular em comparação às fêmeas. O crescimento alométrico da paleta dos animais que receberam suplementação e da paleta e da perna dos mantidos com a mãe foi precoce, enquanto o das costelas dos cordeiros sob suplementação e daqueles mantidos com a mãe foi tardio, embora os demais componentes tenham tido crescimento semelhante ao da meia-carcaça. Nas fêmeas, apenas a paleta daquelas terminadas no sistema com a mãe teve crescimento precoce, sendo isogônico para os demais cortes. Os sistemas de terminação avaliados comprovam que cordeiros Texel × Corriedale abatidos com condição corporal similar apresentam qualidade de carcaça semelhante. Houve influência do sexo sobre as características quali-quantitativas da carcaça. O desenvolvimento dos componentes regionais, nos machos, é influenciado pelo sistema de terminação, enquanto os componentes teciduais não são influenciados pelo sistema de terminação e sexo.Palavras-chave: alometria, composição tecidual, crescimento, ovinos, paleta, perna Carcass quality, parts and tissue development of lambs finished in three systemsABSTRACT -The objective of this study was to evaluate the effect of finishing systems on natural pasture and gender on the carcass quality, parts and tissue development of lambs. Forty-five non-castrated males and forty-five females were distributed in a completely randomized design into three treatments: lamb with mother kept on pasture; weaned lamb kept on pasture and weaned lamb kept on pasture with supplementation (soybean hulls at 1% of body weight). The criteria for slaughter was body condition score (2.0 -3.0). The carcass characteristics and parts composition were influenced by the sex.The finishing system with supplementation promoted greater carcass yield and longer leg length. The tissue composition was different only for the sex, with the males presenting bigger amount of muscle mass. The allometric growth of shoulder of supplemented lambs and the shoulder and leg of the lambs with mother had been precocious, while the ribs of the supplemented lambs and lambs with the mother were late and the other components had growth similar to the half-carcass. For the females, only shoulder of lambs finished with mother prese...

Performance and grazing behavior of growing goats supplemented with palm tree fruit

“…The LEA measurement is a good indicator of carcass conformation, with a positive correlation of LEA with the percentage and distribution of the muscular biomasses (Mora et al, 2015). Late-maturing muscles, such as Longissimus dorsi, are the most used in this evaluation for easy measurement by ultrasound and for providing more reliable indices of muscle tissue development and size (Hashimoto et al, 2012).…”

Feeding Systems and the Physicochemical and Sensory Quality of Lamb Meat: Can Feeding Systems Affect Lamb Meat Quality?

“…Similarly, REA was also higher (p < 0.01) for supplemented weaned lambs, confirming a greater muscle development in these animals. Although the LM muscle had late development (Owens et al, 1995;Hashimoto et al, 2012), it was observed that concentrate supplementation provided higher muscle deposition for lambs (mean 143-144 days old), which corresponded to an increased yield of high value meat cuts (Safari et al, 2001). These results agree with the study of Carvalho et al (2006) and Carvalho et al (2007), who found that a daily supply of concentrate equal to or greater than 2% of body weight for lambs would be sufficient to override the lack of milk and improve the performance of the animals.…”

Characteristics of carcass and non-carcass components of lambs fed wet brewery waste as a roughage feed

“…This result is a consequence of lesser muscle development in the animals, as evidenced by the reduction in REA with the increasing WBW levels (Table 3). Rib-eye area is considered a representative measure of the quantity and distribution of muscle mass as well as the quality of the carcass (Hashimoto et al, 2012). This smaller amount of muscle per unit of carcass length can be associated with a reduction in the energy content of the diet resulting from the increasing WBW content, which also led to a reduction in the weight and fatness degree of the carcasses.…”

“…The feed provided to animals can influence several aspects related to traits of their carcass (Gois et al, 2019;Hashimoto et al, 2012) as well as of non-carcass components, which can represent 40 to 60% of live weight (Gois et al, 2019). Despite having no defined commercial value in terms of carcass yield, these components are considered in the sale of live animals and are paid for after slaughter.…”