Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil.
Trop Anim Health Prod
; 48(1): 87-94, 2016 Jan.
Article
en En
| MEDLINE
| ID: mdl-26431709
ABSTRACT
The aim of this study was to determine the energy and protein requirements of non-descript breed hair lambs (NDB) reared under Brazilian semiarid conditions. Sixty animals from three sex classes (20 intact males, 20 castrated males, and 20 females) with an average initial body weight of 18.1 ± 0.4 kg and an average age of 5 months were used. The nutritional requirements were estimated using the comparative slaughter. The animals in the final slaughter group were distributed in a completely randomized design with a 3 × 3 factorial scheme (three sex classes and three feeding levels ad libitum feeding (positive energy balance), 70% feed restriction (maintenance level), and 80% feed restriction (negative energy balance)). The net energy requirement for maintenance (NEm) did not differ between sex classes (P > 0.05) and it was 68 kcal/kg of metabolic empty body weight (EBW(0.75))/day (P < 0.05). The coefficients for the nonlinear regression of retained energy (RE) on the empty body weight gain (EBWG) were not different among the different sex classes (P > 0.05). The net energy requirement for weight gain (NEg) was estimated by NEg (Mcal/day) = 0.29 × EBW(0.75) × EBWG(0.86) for all sex classes (P < 0.05). The net protein requirement for weight gain (NPg) was estimated by NPg (g/day) = 224.45 × EBWG - 0.025 × RE for all sex classes (P < 0.05). The NEg increased and the NPg decreased with the increase in body weight of NDB lambs.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Ingestión de Energía
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Ovinos
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Proteínas en la Dieta
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Metabolismo Energético
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Alimentación Animal
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Necesidades Nutricionales
Límite:
Animals
País/Región como asunto:
America do sul
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Brasil
Idioma:
En
Revista:
Trop Anim Health Prod
Año:
2016
Tipo del documento:
Article
País de afiliación:
Brasil