ORIGINAL PAPER
Estimation of digesta kinetics of different particle size fractions using rumen evacuation technique in dairy cows fed red clover-grass silag
A. R. Bayat 1, 2,   M. Rinne 1,   H. Khalili 1,   R. Valizadeh 2,   P. Huhtanen 1, 3  
 
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1
MTT Agrifood Research Finland, Animal Production Research, 31600 Jokioinen, Finland
2
Animal Science Department, Agricultural Faculty, Ferdowsi University of Mashhad, 91775-1163 Mashhad, Iran
3
Current address: Department on Animal Science, Cornell University, Ithaca, NY 14853-4801, USA
CORRESPONDING AUTHOR
P. Huhtanen   

Department on Animal Science, Cornell University, Ithaca, NY 14853-4801, USA
Publication date: 2007-11-21
 
J. Anim. Feed Sci. 2007;16(4):538–554
 
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ABSTRACT
Ruminal kinetic parameters of different particle size fractions were estimated using four lactating dairy cows in a 4×4 Latin square experiment. Cows received red clover-grass silage alone diet. Ruminal contents and faeces were divided into six particle size fractions by wet sieving. Indigestible (iNDF) and potentially digestible (pdNDF) neutral detergent fibre were separated by a 12d ruminal in situ incubation. Particles >2.5 mm formed the greatest dry matter, iNDF and pdNDF pools in the rumen. Passage rates of iNDF and pdNDF increased with decreasing particle size. Particle breakdown in the rumen was a relatively slow process (0.041 h-1). Contribution of particle breakdown to turnover of different particle size fractions of rumen iNDF decreased with decreasing particle size while the contribution of passage increased. Accumulation of iNDF in the rumen was greater than generally observed with grass-based diets and pdNDF was rapidly digested.
 
CITATIONS (3):
1.
Ruminal large and small particle kinetics in dairy cows fed red clover and grass silages harvested at two stages of growth
A.R. Bayat, M. Rinne, K. Kuoppala, S. Ahvenjärvi, A. Vanhatalo, P. Huhtanen
Animal Feed Science and Technology
 
2.
A comparison of ruminal or reticular digesta sampling as an alternative to sampling from the omasum of lactating dairy cows
F. Fatehi, S.J. Krizsan, H. Gidlund, P. Huhtanen
Journal of Dairy Science
 
3.
Ruminal large and small particle kinetics in dairy cows fed primary growth and regrowth grass silages harvested at two stages of growth
A.R. Bayat, M. Rinne, K. Kuoppala, S. Ahvenjärvi, P. Huhtanen
Animal Feed Science and Technology
 
ISSN:1230-1388