Abstract
Ultrassonography is an important option to evaluate carcass composition and quality, as it is a non-invasive technique which quantifies different tissues in live animals. The objective of this study was to estimate the correlation between measurements taken in vivo, using ultrasound and skinfold thickness, in sheep carcasses from Santa Inês breed. Eighty-one males, aging 8 to 18 months, and weighting on average 31 kg live weight were used. The measures taken in vivo by ultrassonography were longitudinal diagonal length, longitudinal rib eye area, transversal diagonal length, transversal rib eye area. Hot carcass weight, carcass yield, carcass fat thickness, carcass length, carcass rib eye area and commercial retail cut weight (leg, loin, shoulder, ribs and neck) were determined. The analyses of variance, main components, polynomial regression and correlation were carried out using SAS® statistical program. There was no difference between castrated and intact animals for carcass quality and components, indicating that castration does not provide better carcass quality. Animals with higher leg, shoulder and rib weights had lower skin weight, wither height and weight of abdominal organs, indicating a more desirable body type for selection. Body weight, body length and rib eye area by ultrasound (in vivo) can predict the rib eye area, leg weight, carcass length, hot and half carcass weight. However, loin, neck and rib weights, carcass yield and weight of abdominal organs cannot be predicted by these in vivo measurements. The measurements taken with skinfold showed no significant correlations with carcass measures, which indicates that they are not efficient for prediction of carcass components and therefore should not be used. KEYWORDS: carcass yield; castrated; correlation; regression; rib eye area; skinfold.
Highlights
No Brasil a maior parte da carne ovina ofertada é proveniente de animais com baixa qualidade de carcaça o que, provavelmente, está relacionado à genética e aos manejos nutricional e sanitário
A composição das carcaças pode ser estimada por meio da mensuração da área de olho de lombo (AOL) e da espessura da gordura subcutânea (EGS) tomadas na altura da inserção da 12a e 13a costelas, que apresentam correlação alta e positiva com a distribuição de músculos e com o teor de gordura na carcaça, respectivamente
Na Tabela 4 estão apresentadas as equações de regressão usando as características e componentes de carcaça estudadas como variáveis dependentes e as medidas realizadas por ultrassom, o peso vivo, a altura da cernelha e o comprimento do corpo do animal como variáveis independentes
Summary
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Fonte: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-68912013000100002. Acesso em: 31 jul. 2020. REFERÊNCIA PIMENTEL, Concepta Margaret McManus et al Avaliação ultrasonográfica da qualidade de carcaça de ovinos Santa Inês. Ciência Animal Brasileira, Goiânia, v. 14, n. 1, p. 8-16, jan./mar. 2013. DOI: https://doi.org/10.5216/cab.v14i1.12336. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-68912013000100002. Acesso em: 31 jul. 2020.
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