Estudo alométrico dos tecidos da carcaça de cordeiros Santa Inês puros ou mestiços com Texel, Ile de France e Bergamácia

Abstract

RESUMO -Utilizaram-se 103 cordeiros, machos e fêmeas, Santa Inês puros (SS) e mestiços com Texel (TS), Ile de France (FS) e Bergamácia (BS) confinados individualmente e abatidos aos 15, 25, 35 ou 45 kg de peso vivo. Após abate e resfriamento da carcaça, foram separados os cortes comerciais pescoço, costela/fralda, costeleta, lombo, paleta e perna, os quais foram dissecados em músculo, osso e gordura. O crescimento alométrico de cada tecido da meia-carcaça foi avaliado em relação ao peso da carcaça fria e os tecidos da perna, do lombo e da paleta em relação ao peso do corte. O desenvolvimento do músculo na meia-carcaça nos machos Santa Inês, Santa Inês × Texel e Santa Inês × Ile de France e nas fêmeas Santa Inês e Santa Inês × Texel foi semelhante ao do peso vivo vazio (coeficiente alométrico (b) = 1), enquanto, nos machos Bergamácia e nas fêmeas Ile de France e Bergamácia, foi precoce (b<1). O desenvolvimento do músculo foi precoce (b<1) na paleta dos machos TS e BS e das fêmeas FS e BS; no lombo de machos TS e fêmeas SS, TS e BS; e na perna dos machos BS e fêmeas TS e BS. O desenvolvimento do osso nos cortes e na meia-carcaça foi precoce (b<1) em todos os grupos, com exceção dos ossos da paleta dos machos SS, TS e BS e das fêmeas TS; e dos ossos da perna dos machos BS, com desenvolvimento semelhante (b=1) ao desenvolvimento do corte. O desenvolvimento da gordura nos cortes e na meia-carcaça foi tardio (b>1) em todos os grupos, com exceção da gordura da paleta nos machos BS, cujo desenvolvimento foi semelhante ao do corte (b=1). were evaluated. The alometric growth of each tissue of the loin, shoulder and leg in relation to the cut weight, and of each tissue of the ½ carcass in relation to the cold carcass weight, was measured. The allometric growth of muscles in the ½ carcass, for BS males and FS and BS females, was early (b<1). The alometric growth of the bone in the cuts and ½ carcass was early (b<1), except for shoulder bone in SS, TS and BS males, and TS females; and leg bone in BS males, with isogonic allometric growth (b=1). The development of fat in the cuts, and ½ carcass was late (b>1), except shoulder fat in BS males, with isogonic growth (b=1). The growth rate of shoulder muscles in SS and FS males, SS and TS females was isogonic (b=1); for TS and BS males, FS and BS females, it was early (b<1). The muscle development in the loin from SS, FS and BS males, and females FS, was isogonic (b=1); for TS males and SS, TS and BS females, it was negative heterogonic (b<1). The allometric growth of the muscle in the loin from SS, TS and FS, and SS and TS females, was isogonic (b=1); and for BS males and TS and BS females, it was negative heterogonic (b<1).Key Words: crossbreeding, development, growth, sheep IntroduçãoA produção de ovinos de corte no Brasil está em ascensão, mas são necessárias pesquisas para avaliação dos pesos de abate e grupos genéticos para melhorar a eficiência de produção e atender às exigências de consumidores. A avaliação do crescimento possibilita verificar fases de desenvolvimento que...

Carcass characteristics and meat quality of lambs fed with cassava foliage hay and spineless cactus

“…The legs of sheep fed with TH + SC and CH + SC were heavier by about 300 g of muscle and 100 g of fat when compared to the legs of sheep fed TH, possibly due to the greater deposition of tissue derived from the greater supply of nutrients of animals fed SC. Muscle tissue grows in a similar way to sheep carcass weight, while fat growth is delayed (Garcia et al., 2009), so the increase in CCW results in increases in muscle and fat tissue, even though the latter grows more slowly. Adipose tissue (fat, %) was about 5% higher in the legs of sheep fed CH + SC compared to those fed TH alone.…”

Genetic parameters for ultrasound-evaluated carcass and body traits in Anglo-Nubian goats

“…The mean sternal subcutaneous fat thickness (6.10 mm; Table 1) observed in this study can be explained by earlier fat deposition in this region compared to the fat thickness measured in the longissimus dorsi muscle (Furusho-Garcia et al, 2009). The fat thickness values in the sternum (FTS) were similar to those found by Figueiredo Filho et al (2012), who evaluated carcass traits with ultrasonography in Boer x Anglo-Nubian goats and considered sternal subcutaneous fat as a suitable alternative for assessing carcass quality of field-raised goats.…”

Allometric growth of ½ Dorper + ½ Santa Inês lambs slaughtered with different subcutaneous fat thicknesses

“…Despite this, a similar behavior was observed for the total development of the cut due to the general precocity of all parts of the shoulder. The precocious growth of the shoulder muscle was also observed for Texel (Carvalho et al, 2016), pure Santa Inês, Santa Inês x Texel, Santa Inês x Ile de France, and Santa Inês x Bergamácia (Furucho Garcia et al, 2009) lambs.…”