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Selected Publication:

Publication type: Journal Article
Document type: Full Paper

Year: 2012

Author(s): Zebeli, Q; Klevenhusen, F; Drochner, W

Title: Characterisation of particle dynamics and turnover in the gastrointestinal tract of Holstein cows fed forage diets differing in fibre and protein contents.

Source: Arch Anim Nutr. 2012; 66(5):372-384



Authors Vetmeduni Vienna:

Klevenhusen Fenja
Zebeli Qendrim

Vetmed Research Units
Institute of Animal Nutrition and Functional Plant Compounds


Abstract:
An improved understanding of the role of forage quality on the processes of particle dynamics and turnover is important for the development of healthier and cost-effective feeding strategies that aim at lowering the proportions of concentrates in the diets of cattle. The aim of this study was to evaluate the effects of feeding hays of different qualities on particle dynamics, digestion kinetics and turnover in the gastrointestinal tract (GIT). Three non-lactating, rumen fistulated Holstein cows were fed diets consisting exclusively of hay with either low quality [Group LH; 605 ± 12.4 g/kg neutral detergent fibre (NDF) and 63 ± 4.7 g/kg crude protein (CP)] or good quality (Group GH; 551 ± 20.1 g/kg NDF and 116 ± 3.6 g/kg CP). Data showed that in situ dry matter (DM) disappearance of the soluble fraction was greater for Group GH (p < 0.05). Feeding good quality hay also lowered the proportion of particles >1.18 mm particularly during the eating process (p < 0.05). Changes in the particle size occurring afterwards were greater for Group GH as well (p < 0.05); approximately 30% in the comminution in the particle size occurred postruminally. Feeding hay of good quality lowered DM content of solid rumen digesta (p < 0.05), accelerated (p < 0.05) the turnover rate of DM and NDF in the GIT and increased DM intake (p < 0.05). In conclusion, feeding forages of better quality significantly promoted degradation processes and kinetics in the GIT with positive effects on turnover rate of digesta and feed intake in Holstein cows.

Keywords Pubmed: Animal Feed/analysis*
Animal Nutritional Physiological Phenomena
Animals
Cattle
Cross-Over Studies
Diet/veterinary*
Dietary Fiber/administration & dosage
Dietary Fiber/pharmacology*
Dietary Proteins/administration & dosage
Dietary Proteins/pharmacology*
Digestion
Eating
Female
Gastrointestinal Motility/drug effects*
Gastrointestinal Tract/physiology*
Particle Size
Rumen/physiology


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