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- Title
Urinary excretion of purine derivatives, microbial protein synthesis, nitrogen use, and ruminal fermentation in sheep and goats fed diets of different quality.
- Authors
Carro, M. D.; Cantalapiedra-Hijar, G.; Ranilla, M. J.; Molina-Alcaide, E.
- Abstract
The objective of this study was to com-pare N balance, microbial N flow (MNF) estimated from purine derivatives (PD) urinary excretion, and its variation when estimated using purine bases:N ratios in liquid associated bacteria (LAB) from models reported in the literature (MNF - response models) or measured ratios in liquid and solid-associated bacterial (SAB) pellets (MNF-LAB+SAB), diet digestibility, and rumen fermentation variables in sheep and goats fed 3 different practical, quality diets to study interspecies differences concerning N use as accurately as possible. Four mature female Merino sheep and 4 mature female Granadina goats, each fitted with a ruminal cannula, were used in 3x3 Latin square design with an extra animal. Two experimental diets had a forage-to-concentrate ratio of 70:30 (DM basis) with alfalfa hay (ALC) or grass hay (GRC) as forage, and the third diet contained 70% concentrate and 30% alfalfa hay (CAL). All animals were fed the diets at a daily rate of 56 g/kg BW0. 75 to minimize feed selection. Digestibility of nutrients was similar (P = 0.16 to 0.88) in the 2 species, but some animal species x diet interactions (P = 0.01 to 0.04)
- Subjects
EXCRETION; PURINES; MICROBIAL proteins; FERMENTATION; ANIMAL feeding; DIGESTION
- Publication
Journal of Animal Science, 2012, Vol 90, Issue 11, p3963
- ISSN
0021-8812
- Publication type
Article
- DOI
10.2527/jas.2011-4577