Relationship between efficiency of nitrogen utilization and isotopic nitrogen fractionation in dairy cows: contribution of digestion v. metabolism?

Animal : an International Journal of Animal Bioscience
G Cantalapiedra-HijarI Ortigues-Marty

Abstract

Animal tissues are naturally 15N enriched relative to their diet and the extent of this difference (Δ15Nanimal-diet) has been correlated to the efficiency of N assimilation in different species. The rationale is that transamination and deamination enzymes, involved in amino acid metabolism are likely to preferentially convert amino groups containing 14N over 15N. However, in ruminants the contribution of rumen bacterial metabolism relative to animal tissues metabolism to naturally enrich animal proteins in terms of 15N has been not assessed yet. The objective of this study was to assess the impact of rumen and digestion processes on the relationship between Δ15Nanimal-diet and efficiency of N utilization for milk protein yield (milk N efficiency (MNE); milk N yield/N intake) as well as the relationship between the 15N natural abundance of rumen bacteria and the efficiency of N use at the rumen level. Solid- and liquid-associated rumen bacteria, duodenal digesta, feces and plasma proteins were obtained (n=16) from four lactating Holstein cows fed four different diets formulated at two metabolizable protein supplies (80% v. 110% of protein requirements) crossed by two different dietary energy source (diets rich in starch v. fiber...Continue Reading

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Citations

Dec 30, 2017·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty
May 28, 2020·American Journal of Physiology. Endocrinology and Metabolism·O L ManthaH Fouillet
Aug 17, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Kavindra WijenayakeDianne Clarke
Feb 13, 2021·Animals : an Open Access Journal From MDPI·Anna Lavery, Conrad P Ferris
Jul 27, 2021·Animal : an International Journal of Animal Bioscience·P Guarnido-LopezG Cantalapiedra-Hijar
Oct 24, 2017·Journal of Agricultural and Food Chemistry·Sarah J MealeGonzalo Cantalapiedra-Hijar

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