Indirect methods for predicting body composition of Boer crossbreds and indigenous goats from the Brazilian semiarid

Abstract

The aim of this study was to evaluate the correlation and to develop regression equations between the body composition obtained by the comparative slaughter and the neck composition and the ultrasound ribeye area (REAu) in goats from the Brazilian semiarid region. Forty-five intact male goats from three genetic groups were used: 15 Canindé, 15 Moxotó, and 15 F1 Boer x non-descript breed. Animals were randomly assigned to three feeding levels (ad libitum, 25 and 50% restriction) aimed to result in different slaughter weights and body composition, to fit the regression equations. The REAu was assessed between the 12th and 13th ribs with a 7.5 MHz linear transducer. The values of crude protein, ether extract, and water in the empty body showed high positive correlation (P < 0.01) with REAu and with the same values measured in the neck for all genetic groups. In addition, body composition was well predicted (R(2) > 0.80) from the REAu and from the neck composition.

Pre- and Post-Slaughter Methodologies to Estimate Body Fat Reserves in Lactating Saanen Goats

“…The nutritional status of animals can be estimated by direct and indirect methods. The comparative slaughter is the most accurate direct method, but it is expensive, because at least half of the carcass is lost [ 4 ], it is destructive and laborious, and it does not allow for the use of the same animal more than once [ 5 ]. Therefore, indirect methods are preferable because most of them are not complex and can be applied to live animals [ 6 ].…”

Prediction of carcass energy content of Pelibuey ewes by ultrasound measurements

“…Due to the high cost represented by dissection, grinding and chemical analysis, alternative methods for determining the composition of the carcass and body of farm animals have been studied (Silva et al 2015, Silva 2016 cause they are considered non-invasive (Scholz et al 2015), are easier and cheaper to implement and can be applied to live animals (Silva et al 2015, Silva 2016. Among current techniques, the most notable are ultrasound (Aguilar-Hernández et al 2016), biometric measures (Fonseca et al 2017, BautistaDiaz et al 2017) and digital image analysis .…”

Evaluación del consumo de energía metabolizable sobre el contenido energético de la canal en borregas Pelibuey

“…Existe poca información en relación con la composición de la canal y los requerimientos energéticos en ovejas Pelibuey adultas (9,10) . Por otro lado, se ha reportado que el conocimiento de los requerimientos nutricionales de los animales es fundamental para incrementar la eficiencia de los sistemas de producción, siendo necesaria la determinación de la composición corporal (11,12,13) .…”