ORIGINAL PAPER
Sources of omega-6 fatty acids do not alter the rumen degradation and transit of fibre from dairy cow diets
 
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1
State University of São Paulo, Department of Animal Science, School of Agrarian and Veterinary Science, Jaboticabal, Sao Paulo, Brazil
2
Federal University of Great Dourados, Department of Animal Science, School of Agrarian Sciences, Rodovia Dourados, Itahum, Km 12, Cidade Universitária, Caixa Postal 533, CEP: 79.804-970, Dourados, Mato Grosso do Sul, Brazil
3
Federal University of Viçosa, Department of Animal Science, Viçosa, Minas Gerais, Brazil
4
University of Sao Paulo, Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, Pirassununga, Sao Paulo, Brazil
CORRESPONDING AUTHOR
J. R. Gandra   

Federal University of Great Dourados, Department of Animal Science, School of Agrarian Sciences, Rodovia Dourados, Itahum, Km 12, Cidade Universitária, Caixa Postal 533, CEP: 79.804-970, Dourados, Mato Grosso do Sul, Brazil
Publication date: 2013-11-05
 
J. Anim. Feed Sci. 2013;22(4):295–301
 
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ABSTRACT
The objective of this study was to evaluate the behaviour of fibre in the digestive tract on the basis of the passage kinetics of forage and concentrate particles in cows fed different omega-6 fatty-acid sources. The scientific hypothesis of this study was that omega-6 fatty acids do not interfere with the digestion of fibre in the diets of dairy cows. Five primiparous lactating Holstein cows were used in the experiment. The experimental diets were: control (C), ground soyabean (GS), cottonseed (CS), soyabean oil (SO), calcium salts of fatty acids (CSFA). The global mean estimates for the parameters of passage rate (γ) were 0.038 and 0.055 h–1 for forage and concentrate, respectively. The only significant effect with respect to the passage rate was a high negative correlation between the concentrate passage rate and dry matter intake. There was less undegradable neutral detergent fibre (NDF) in treatments without added lipid. Dietary supplementation with lipid sources does not alter the kinetic parameters of roughage and concentrate particle passage or in vitro NDF degradation. Sources of omega-6 fatty acids do not alter the rumen degradation and transit of fibre.
 
CITATIONS (1):
1.
Effect of different dietary inclusion levels of whole raw soyabean on ruminal fermentation and nutrient utilization in Nelore steers
N. Cônsolo, J. Gandra, R. Gardinal, J. Freitas Júnior, C. Takiya, F. Rennó, A. Pereira
Journal of Animal and Feed Sciences
 
ISSN:1230-1388