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

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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 (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.

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Abbreviations

ADG:

Average daily gain

BW:

Body weight

DEI:

Digestible energy intake

DMI:

Dry matter intake

EBW:

Empty body weight

EBWG:

Empty body weight gain

FBW:

Fasting body weight

HP:

Heat production

Kg:

Efficiency of use of metabolizable energy for gain

MEg:

Metabolizable energy requirement for gain

MEI:

Metabolizable energy intake

MEm:

Metabolizable energy requirement for maintenance

NDB:

Non-descript breed

NEg:

Net energy requirement for weight gain

NEm:

Net energy requirement for maintenance

NPg:

Net protein requirement for weight gain

RE:

Retained energy

TDNI:

Total digestible nutrient intake

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Acknowledgments

We thank the Conselho Nacional de Pesquisa e Desenvolvimento (CNPq, Brazil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) and Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE, Brazil) for providing financial support.

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Authors and Affiliations

  1. Department of Animal Science, Universidade Federal do Vale do São Francisco - UNIVASF, Petrolina, Pernambuco, 56300-990, Brazil

    Rafael Torres de Souza Rodrigues, Samara Rodrigues Martins, Ivonete Ferreira da Silva & Mário Adriano Ávila Queiroz

  2. Department of Animal Science, Universidade Federal de Lavras - UFLA, P.O. Box 3037, Lavras, Minas Gerais, 37200-000, Brazil

    Rafael Torres de Souza Rodrigues, Mario Luiz Chizzotti & Karina Costa Busato

  3. Instituto Federal de Educação, Ciência e Tecnologia do Sertão Pernambucano - IF Sertão, Petrolina, Pernambuco, 56314-520,, Brazil

    Tiago Santos Silva

  4. Departament of Animal Science, Universidade Federal de Campina Grande - UFCG, Patos, Paraíba, 58700-970, Brazil

    Aderbal Marcos de Azevêdo Silva

Authors
  1. Rafael Torres de Souza Rodrigues
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  2. Mario Luiz Chizzotti
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  3. Samara Rodrigues Martins
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  4. Ivonete Ferreira da Silva
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  5. Mário Adriano Ávila Queiroz
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  6. Tiago Santos Silva
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  7. Karina Costa Busato
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  8. Aderbal Marcos de Azevêdo Silva
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Corresponding author

Correspondence to Rafael Torres de Souza Rodrigues.

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The authors declare that they have no competing interests.

Statement of animal rights

The experimental procedures followed the animal care of the Committee of the UNIVASF (0010/040713).

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Rodrigues, R.T.d.S., Chizzotti, M.L., Martins, S.R. et al. 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, 87–94 (2016). https://doi.org/10.1007/s11250-015-0924-2

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