In vivo estimation of lamb carcass composition by real-time ultrasonography

Abstract

The objective of this study was to evaluate the accuracy of ultrasonography to measure fat thickness in live lambs and predict carcass composition to find a system that can assess carcass composition easily and accurately, without damage to the product and can improve carcass classification.Fat thickness (FTh) between the 12th and 13th ribs and between the 3rd and 4th lumbar vertebrae, was measured in vivo using realtime ultrasound, in 67 Churra Galega Bragançana males (mean weight 36.0 kg, range 21.5-47.0 kg), using an ALOKA SSD-500V equipped with two probes (5 and 7.5 MHz) in order to predict carcass composition. The most satisfactory correlation between carcass and ultrasound measurements was between the 3rd and 4th lumbar vertebrae fat thickness (FTh). The first variable admitted in the models to predict carcass composition (live weight, LW) explained between 63% and 96% of the total variation of the weight of the components of the carcass. In fact, 96% of the variation in total amount of muscle was accounted for by live weight. The inclusion of the ultrasound measures with the 7.5 MHz probe improved, in all prediction equations, the coefficient of determination (R 2 ) with a substantial reduction in the residual standard deviation (RSD). In relation to the subcutaneous fat of the carcass, 85% of the variation was explained by live weight and the FTh 12-13 7.5 measurement. In the prediction model for total carcass fat weight, live weight and ultrasound fat thickness measurement explained 88% of the variation. The results indicate that in vivo ultrasound fat thickness measures in association with live weight can be used to predict carcass composition in Churra Galega Bragançana lambs.

The influence of strain and age on some egg quality parameters of commercial laying hens

“…Raji et al (2009) reported that the relationship between live body measurement for estimation of carcass component in vivo depends on the correlation between them, these observation was noticed here with higher correlation existing between body weight and carcass components (.906, .950 and .786) with carcass weight , breast weight and thigh weight respectively. Several authors, (Sehested 1986;Teixeira et al, 2006;Wood and Maefie, 1980;Delfa et al, 1996) observed that multiple regression models developed to predict lean meat weight are dominated by live weight or carcass weight . In the present findings, prediction of both the carcass weight and breast weight seems to have been mainly influenced singly by the body weight 82 and 90.2%…”

Real-time ultrasound (RTU) imaging methods for quality control of meats

“…(2005) Aloka 500V; 7.5 MHz Predicting body and carcass chemical composition Silva et al . (2006a) Aloka 500V; 5 and 7.5 MHz Predicting carcass composition Teixeira et al . (2006) Aloka 500V; 5 and 7.5 MHz Predicting carcass composition Hopkins et al .…”

Desempenho e características da carcaça de cordeiros alimentados com bagaço de caju

“…A utilização da ultrassonografia tem se mostrado uma téc-nica eficiente para avalivar a gordura subcutânea in vivo, a deposição muscular; bem como estimar a qualidade e a composição da carcaça (Silva et al, 2003); permitindo prever o momento ideal do abate (Teixeira et al, 2008). Estudos em caprinos (Teixeira et al, 2008), ovinos (Silva et al, 2006, Teixeira et al, 2006, suínos (Dutra Jr. et al, 2001) e bovinos (Prado et al, 2004) têm demonstrado uma correlação altamente significativa entre as medidas realizadas por meio da ultrassonografia e as realizadas na carcaça, tornando-se uma técnica de elevada precisão para predizer a composição da carcaça.…”

“…As avaliações foram realizadas com a utilização de um transdutor linear de 5,0 MHz, no lado esquerdo do animal. Para a mensuração da AOL, o transdutor foi disposto de maneira perpendicular ao comprimento do músculo Longissimus dorsi, entre a 12 a e a 13 a costela, ao passo que, para as mensurações da EGS e da PLD, o transdutor foi disposto de maneira longitudinal, entre a 3 a e 4 a vértebras lombares, de acordo com Teixeira et al (2006). A mensuração da espessura da gordura subcutânea em borregos no intervalo de idade considerado neste trabalho é dificultada pela não distinção da interface entre esta camada e a pele, assim a EGS foi mensurada juntamente com a pele de acordo com Teixeira (2008 (PCQ) e o rendimento de carcaça quente (RCQ= PCQ/PVA x 100).…”