Título:	Kinetics of digestion of low-quality forage grazed by beef cattle fed supplements containing increasing levels of rumen undegradable protein
Autor(es):	Gomes, Raphael dos Santos Oliveira, Tadeu Silva de Pereira, José Carlos Vieira, Ricardo Augusto Mendonça Silva, Cássio José da Leonel, Fernando de Paula Fernandes, Alberto Magno Azevedo, Flavio Henrique Vidal
Assunto:	Proteína Capim Suplementação nutricional
Data de publicação:	Set-2016
Editora:	Sociedade Brasileira de Zootecnia
Referência:	GOMES, Raphael dos Santos et al. Kinetics of digestion of low-quality forage grazed by beef cattle fed supplements containing increasing levels of rumen undegradable protein. Revista Brasileira de Zootecnia, Viçosa, v. 45, n. 9, p. 563-571, set. 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000900563&lng=en&nrm=iso>. Acesso em: 21 dez. 2017. doi: http://dx.doi.org/10.1590/s1806-92902016000900009.
Abstract:	This experiment was conducted to evaluate the degradation kinetics and microbial efficiency of beef cattle grazing on low-quality forage and receiving supplements with different levels of rumen undegradable protein (RUP). The animals grazed on palisade grass pasture solely or this pasture and supplement containing 40 or 60 g of RUP per 100 g of crude protein (CP). The degradation profiles of neutral detergent fiber, fiber carbohydrates, and neutral detergent insoluble protein were interpreted kinetically by using a decreasing logistic model. Treatments (no supplement, or RUP at 40 or 60 g−1 100 g CP) did not affect rumen fill; however, the increase in the indigestible fiber carbohydrate fraction that occurred at the expense of the digestible fiber carbohydrate fraction resulted in a greater rumen fill effect. The palisade grass showed a significant proportion of its nitrogen in the form of slowly degradable protein as neutral detergent insoluble protein, which amounted to 26 g per 100 g CP. Supplementation with 40 g of RUP per 100 g CP decresead the indigestible fraction of the low-quality forage. However, the absence of a rumen-fill effect demonstrates that the additional supply of nutrients contributes greatly to increasing growth efficiency and use of the available energy from the forage by the ruminal microorganisms.
Unidade Acadêmica:	Faculdade de Agronomia e Medicina Veterinária (FAV)
Licença:	Revista Brasileira de Zootecnia - This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000900563&lng=en&nrm=iso. Acesso em: 21 dez. 2017.
DOI:	http://dx.doi.org/10.1590/s1806-92902016000900009
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