Relationship between forage neutral detergent fiber and non-fibrous carbohydrates on ruminal fermentation products and neutral detergent fiber digestibility in goats

  • Ricardo M A Pinho Universidade Federal de Viçosa
  • Edson M Santos Universidade Federal da Paraíba
  • Juliana S de Oliveira Universidade Federal da Paraíba
  • Gleidson G P de Carvalho Universidade Federal Bahia
  • Joyce P Alves Universidade Federal da Paraíba
  • Alberto J da S Macêdo Universidade Federal de Campina Grande
  • Gildenia A Pereira
  • Danilo M Pereira Universidade Federal da Paraíba
  • Alexandre F Perazzo Universidade Estadual do Sudoeste da Bahia
  • Anderson de M Zanine Universidade Federal do Maranhão
Keywords: digestion, energy, microbial protein, physically effective fiber, rumen

Abstract

Background: There is a comprehensive understanding of the role of dietary fiber as a nutrient and its function during digestion in cattle. On the other hand, the role of fiber digestion in goats has not received similar attention. Objective: To evaluate the effects of different ratios of forage neutral detergent fiber (fNDF) and non-fibrous carbohydrates (NFC) on ruminal fermentation products, and in vitro neutral detergent fiber (NDF) digestibility in goats. Methods: A 3 × 5 factorial arrangement in a completely randomized design with three fNDF levels (100, 190, and 290 g/kg) and five NFC levels (350, 400, 450, 500, and 550 g/kg) was used. The experiment was performed in vitro. Two ruminally fistulated goats were used as rumen liquid donors. Results: The ratios between fNDF and NFC affected all ruminal parameters (p<0.05). Increasing NFC levels in diets containing 100 and 290 g/kgfNDF resulted in linear increase (p<0.05) in ammonia concentration after 48 h fermentation. There was no adjustment of linear models (p>0.05) for pH values. Total volatile fatty acids (VFA) and their individual molar proportions were affected (p<0.05) at all fNDF and NFC levels. The NDF digestibility was not affected (p>0.05) by fNDF or NFC levels, except for diets containing 290 g/kg fNDF, which were fit to a quadratic model (p<0.05). Conclusion: The relationship between fNDF and NFC concentrations affect the fermentation end products and in vitro NDF digestibility. NFC plays a more consistent role than fNDF in the ruminal microbial ecosystem of goats during in vitro fermentation.

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Author Biographies

Ricardo M A Pinho, Universidade Federal de Viçosa

Departamento de Zootecnia, Universidade Federal de Viçosa, 36570-000 Viçosa, Minas Gerais, Brasil

Edson M Santos, Universidade Federal da Paraíba
Departamento de Zootecnia, Universidade Federal da Paraíba, 58397-000, Areia, Paraíba, Brasil.
Juliana S de Oliveira, Universidade Federal da Paraíba
Departamento de Zootecnia, Universidade Federal da Paraíba, 58397-000, Areia, Paraíba, Brasil.
Gleidson G P de Carvalho, Universidade Federal Bahia
Departamento de Zootecnia, Universidade Federal Bahia, 40170-110, Salvador, Bahia, Brasil.
Joyce P Alves, Universidade Federal da Paraíba
Departamento de Zootecnia, Universidade Federal da Paraíba, 58397-000, Areia, Paraíba, Brasil.
Alberto J da S Macêdo, Universidade Federal de Campina Grande
Departamento de Ciência Animal, Universidade Federal de Campina Grande, 58708-110, Patos, Paraíba, Brasil.
Danilo M Pereira, Universidade Federal da Paraíba
Departamento de Zootecnia, Universidade Federal da Paraíba, 58397-000, Areia, Paraíba, Brasil.
Alexandre F Perazzo, Universidade Estadual do Sudoeste da Bahia
Bolsista DCR/FAPESB/CNPq, Universidade Estadual do Sudoeste da Bahia, Praça Primavera, 40, Bairro Primavera, Itapetinga, BA, 45700-000 Brasil
Anderson de M Zanine, Universidade Federal do Maranhão
Departamento de Zootecnia, Universidade Federal do Maranhão, 65500-000 Chapadinha, Maranhão, Brasil.
Published
2019-05-17
Section
Original research articles