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.: Home > Animal Science Papers and Reports > 2015 > Volume 33 Number 3 > Hadhami Hajji 1,2 Naziha Atti 1 , Mohamed Ben Hamouda 3

In vivo fat and muscle weight prediction for lambs from fat- and thin-tailed breeds by real-time ultrasonography

Hadhami Hajji 1,2 Naziha Atti 1 , Mohamed Ben Hamouda 3
1 INRA-Tunisie, Laboratoire de Productions Animales et Fourragčres, rue Hédi Karray, 2049 Ariana, Tunisia 2 INAT-43 avenue Charles Nicoles, Tunis, Tunisia 3 Institution de la Recherche et de l’Enseignement Supérieur Agricoles, 30 Rue Alain Savary, 1002 Tunis-Belvédčre Tunisia
Abstract :
The aim of this study was to predict in vivo fat and muscle contents of lambs from a fat-tailed
Barbarine and a thin-tailed Noire de Thibar (NT) breeds. The prediction was performed using body
weight (BW), carcass weight (CW) and ultrasonic measurements. Ultrasonic measurements included subcutaneous fat thickness (FTh), longissimus dorsi muscle depth (MTh), muscle area (MAr) and circumference (MCir), taken on live animals and on carcasses using a real time ultrasound machine equipped with a 3.5 MHz linear probe. Dissected carcass muscle and fat tissues were weighted and then estimated by developing regression equations. BW was the most important estimator for carcass components for both types of breeds. For the fat-tailed breed, muscle content was better predicted by FTh and fat by MAr. The last with BW the latter
explained 77 % of fat variation. For the thin-tailed breed BW and in vivo ultrasonic measurements explained 90 and 88 % of variation for fat and muscle contents, respectively. Using carcass ultrasonic measurements with CW mildly improved accuracy relative to BW and in vivo measurements.
Keywords :
estimation / fat / in vivo / lambs / muscle / ultrasonic

Date Deposited : 24 Mar 2016 11:20

Last Modified : 24 Mar 2016 11:20

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Volume 33, Number 3, June 2015

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