Natural15N abundances in plasma and urea-N concentration in milk as biomarkers of urinary N excretion in dairy cows: a meta-analysis
| Autor: | Long Cheng, E. Froidmont, Pierre Nozière, Gonzalo Cantalapiedra-Hijar, S.M. Nasrollahi, C. Chantelauze, Richard J. Dewhurst, Cécile Martin |
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| Rok vydání: | 2019 |
| Předmět: |
0303 health sciences
Chemistry Urinary system 0402 animal and dairy science 04 agricultural and veterinary sciences Metabolism 040201 dairy & animal science Excretion 03 medical and health sciences chemistry.chemical_compound Animal science Meta-analysis Individual data Urea Biomarker (medicine) Animal nutrition 030304 developmental biology |
| Zdroj: | Energy and protein metabolism and nutrition |
| DOI: | 10.3920/978-90-8686-891-9_66 |
| Popis: | Knowledge on the flux of nitrogen (N) excreted through urines is essential in animal nutrition since it may provide information on animal N metabolism and the extent of environmental N pollution. Both the 15N natural enrichment of animal proteins over the diet (Δ15Nanimal-diet) and the milk urea N (MUN) concentration have been previously linked to N partitioning. The objective of this meta-analysis was to test the effect of combination of Δ15Nanimal-diet in plasma and MUN for predicting the urinary N excretion (UNE) in dairy cows. Individual data on Δ15Nanimal-diet in plasma, MUN, and UNE of 177 cow/period observations were evaluated by meta-analysis. Data were analyzed by mixed-model regression analysis. When model was fitted with either Δ15Nanimal-diet or MUN, both biomarkers were capable to independently predict UNE. However, when Δ15Nanimal-diet and MUN were combined in one model, both biomarkers remained significant and the error of the model decreased. In conclusion, both Δ15Nanimal-diet and MUN can predict UNE and their combination can strengthen the prediction capacity of the model. |
| Databáze: | OpenAIRE |
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