Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil

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• 作者：Rafael Torres de Souza Rodrigues…
• 关键词：Body composition ; Comparative slaughter ; Gender ; Nutritional requirement ; Sheep
• 刊名：Tropical Animal Health and Production
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：48
• 期：1
• 页码：87-94
• 全文大小：296 KB
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• 作者单位：Rafael Torres de Souza Rodrigues (1) (2)
  Mario Luiz Chizzotti (2)
  Samara Rodrigues Martins (1)
  Ivonete Ferreira da Silva (1)
  Mário Adriano Ávila Queiroz (1)
  Tiago Santos Silva (3)
  Karina Costa Busato (2)
  Aderbal Marcos de Azevêdo Silva (4)
  
  1. Department of Animal Science, Universidade Federal do Vale do São Francisco - UNIVASF, Petrolina, Pernambuco, 56300-990, Brazil
  2. Department of Animal Science, Universidade Federal de Lavras - UFLA, P.O. Box 3037, Lavras, Minas Gerais, 37200-000, Brazil
  3. Instituto Federal de Educação, Ciência e Tecnologia do Sertão Pernambucano - IF Sertão, Petrolina, Pernambuco, 56314-520,, Brazil
  4. Departament of Animal Science, Universidade Federal de Campina Grande - UFCG, Patos, Paraíba, 58700-970, Brazil
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Veterinary medicine
  Zoology
  
• 出版者：Springer Netherlands
• ISSN：1573-7438

文摘

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 (EBW0.75)/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 × EBW0.75 × EBWG0.86 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.