Protein fractions and In Vitro fermentation of protein feeds for ruminants

The objective of this study was to evaluate 20 protein feeds grouped in forages, vegetal by- products and animal by-products used for ruminant diets. Protein fractions (PF): A, non-protein nitrogen (NPN); B1, buffer-soluble protein; B2, buffer-insoluble, NDF-soluble protein; B3, NDF-insoluble, ADF-s...

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Published inTropical and subtropical agroecosystems Vol. 14; no. 2; pp. 421 - 429
Main Authors Guevara-Mesa, A. L., Miranda-Romero, L. A., Ramírez-Bribiesca, J. E., González-Muñoz, S. S., Crosby-Galvan, M. M., Hernández-Calva, L. M., Razo-Rodríguez, O. E. Del
Format Journal Article
LanguageEnglish
Portuguese
Published Universidad Autónoma de Yucatán, Facultad de Medicina Veterinaria 01.08.2011
Universidad Autónoma de Yucatán
Subjects
Agronomy
gas production
In vitro
Plant Sciences
Protein fractions
ruminants
protein fractions
protein ingredients
producción de gas in vitro
rumiantes
in vitro gas production
ruminants
fracciones de proteína
ingredientes proteínicos
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Summary:The objective of this study was to evaluate 20 protein feeds grouped in forages, vegetal by- products and animal by-products used for ruminant diets. Protein fractions (PF): A, non-protein nitrogen (NPN); B1, buffer-soluble protein; B2, buffer-insoluble, NDF-soluble protein; B3, NDF-insoluble, ADF-soluble protein; and C, ADF-insoluble protein, were determined for each ingredient. Protein composition was correlated with total gas production in vitro (GP), gas production rate (S), lag time (L), DM disappearance (DMDIV) and residual protein (RPIV). The completely randomised designed was analysed using mixed proc. and Tukey contrasts. Forages contained 18.29, 7.86, 66.00, 2.96, 4.89% of fractions A, B1, B2, B3 and C, respectively. Vegetable byproducts contained 22.55, 4.55, 59.51, 8.84, 4.55% of each fraction, in the same order. Animal by-products contained 19.13, 4.52, 70.24, 3.74, 2.37% of each fraction, in the same order. Vetch, wheat bran and poultry litter had the greatest Vmax in each group. Vmax was correlated (P≤0.01) with total protein (r = -0.45), ADF (r = 0.27) and DMDIV (r = 0.61). In conclusion, there were differences in protein composition and kinetics of in vitro gas production among ingredients.
ISSN:1870-0462
1870-0462