Kinetics of ruminal passage rate of particles of signal grass silage, maize and intercropped

• Published in: Revista brasileira de saúde e produção animal 2015-03, Vol.16 (1), p.149-160
• Main Authors: BELTRÁN, Natalia Andrea Rincón, LEONEL, Fernando de Paula, VILLELA, Severino Delmar Junqueira, TAMY, Wagner Pessanha, CARVALHO, Juliana do Carmo, OLIVEIRA, Margarida Maria Nascimento Figueiredo de, MOREIRA, Leonardo Marmo, MACHADO, Henrique Valentim Nunes, ARAÚJO, Raphael Pavesi
• Format: Article
• Language: English
• Subjects: AGRONOMY
• ISSN: 1519-9940; 1519-9940
• DOI: 10.1590/S1519-99402015000100016

The purpose of this study was to evaluate the kinetics of ruminal passage rate of particles from the subsequent associations: corn and signal grass; corn, signal grass and Calopogônio; corn, signal grass and Macrotiloma; and corn, signal grass and Estilosantes. It was used four crossbred holstein-zebu cattle with the rumen tubed in order to determine the the kinetics of ruminal passage rate of particles. The feces were collected at the times zero (immediately after addition of fibers complexed with chromium), 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 56 , 64, 72, 80, 88, 96, 120, 132, 144 and 192 hours. The profile parameters of passage rate estimative were adjusted according to robust regression procedures. The average time of particles retention in the raft (ATPR1); the average time in the rumen liquid phase (ATRLP2) and the average time of total ruminal retention (ATTRR) were adjusted for the passage kinetics and estimated with the NLIN procedure of SAS. From the observed results, may be suggested that the transference rate λ has an inverse behavior to the escape rate κ, the τ average values, the average retention time and average particles retention time in the rumen liquid phase (ATRLP2) were not statistically different. The feed characteristics after the raft escape and reach to ATRLP2, were very similar; (ATTRR), related to treatments, were not statistically different (P