Variation in urea kinetics associated with ruminant species, dietary characteristics, and ruminal fermentation: A meta-analysis
V.C. Souza, R.R. White
Abstract
). Increasing the ratio of energy to protein (TDN:RDP) increased the GER:UER ratio, decreased the ROC:GER ratio, and increased the UUA:GER ratio and the incorporation of recycled urea N into microbial N relative to gastrointestinal entry rate of urea N. Comparison among models revealed that species was an important explanatory variable affecting most response variables. However, whether these differences are related to the intrinsic N metabolism of each species or due to the diet variation remains unclear. Understanding these differences could lead to improvements in N use efficiency in ruminant diets by formulating more precise low-N diets considering the particularities for each species.
Topics & Concepts
Animal scienceRuminantUreaChemistryNutrientRumenFermentationFood scienceBiologyBiochemistryAgronomyPastureOrganic chemistryRuminant Nutrition and Digestive PhysiologyReproductive Physiology in LivestockLiver Disease Diagnosis and Treatment