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Intake, digestibility, growth performance, and enteric methane emission of Brazilian semiarid non-descript breed goats fed diets with different forage to concentrate ratios

Abstract

The aim of this study was to evaluate the intake, digestibility, growth performance, and enteric methane emissions of Brazilian semiarid non-descript breed goats (NDG) fed diets with different forage:concentrate ratios (100:0, 80:20, 60:40, 40:60, and 20:80) on a dry matter basis. Forty uncastrated male NDG with an average initial body weight of 13.3 kg ± 4.7 kg were distributed in a completely randomized design, with five treatments and eight replications. Ground Tifton-85 hay was used as forage and ground corn and soybean meal were used as concentrate. The sulfur hexafluoride tracer technique was used to measure methane emissions. The intake of dry matter, organic matter, crude protein, and ether extract increased linearly while the intake of neutral detergent fiber decreased linearly as the concentrate proportion increased (P < 0.05). The digestibility of dry matter and organic matter increased while the digestibility of neutral detergent fiber decreased as the concentrate level increased (P < 0.05). There were linear increases in final body weight, total weight gain, average daily gain, and feed efficiency (P < 0.0001). Methane emissions per unit of body weight (ranging from 1.9 to 0.5 g/kg), metabolic body weight (ranging from 3.9 to 1.2 g/kg), and dry matter intake (ranging from 58.8 to 21.9 g/kg) reduced linearly as the concentrate proportion increased (P < 0.01). Decreasing the forage to concentrate ratio in the diet decreased methane emission and increased growth performance of NDG. The 80:20 ratio could be considered more appropriate to reduce methane emissions from NDG, which did not change much at higher levels of concentrate.

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Acknowledgements

The authors thank Dr. Diego Galvani (Embrapa Goats and Sheep, Brazil), Dr. Alexandre Berndt (Embrapa Southeast Livestock), and Dr. Diana Signor (Semiarid Embrapa, Brazil) for support with equipment and laboratory analysis. The authors also thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil), Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE, Brazil, grant number IBPG-1452-5.04/13), INCT Livestock in Semiarid, Empresa Brasileira de Pesquisa Agropecuária (Semiarid Embrapa, Brazil), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) for the financial support.

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Correspondence to Rafael Torres de Souza Rodrigues.

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The experimental procedures followed the animal care of the Committee of the UNIVASF (0009/140415).

Conflict of interest

The authors declare that they have no competing interests.

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Barbosa, A.L., Voltolini, T.V., Menezes, D.R. et al. Intake, digestibility, growth performance, and enteric methane emission of Brazilian semiarid non-descript breed goats fed diets with different forage to concentrate ratios. Trop Anim Health Prod 50, 283–289 (2018). https://doi.org/10.1007/s11250-017-1427-0

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Keywords

  • Forage:concentrate ratio
  • Goats
  • Methane
  • Ruminal fermentation