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Diet–animal fractionation of nitrogen stable isotopes reflects the efficiency of nitrogen assimilation in ruminants.
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- Author(s): Cantalapiedra-Hijar, G.; Ortigues-Marty, I.; Sepchat, B.; Agabriel, J.; Huneau, J. F.; Fouillet, H.
- Source:
British Journal of Nutrition; 4/14/2015, Vol. 113 Issue 7, p1158-1169, 12p- Subject Terms:
AMINO acid metabolism; PROTEIN analysis; PROTEIN metabolism; FECAL analysis; HEART analysis; ADIPOSE tissues; ANIMAL experimentation; BIOPHYSICS; CATTLE; DIET; HISTOLOGICAL techniques; ISOTOPES; KIDNEYS; LACTATION; MATHEMATICS; RESEARCH methodology; MILK proteins; NITROGEN; PROBABILITY theory; PROTEINS; REGRESSION analysis; STATISTICS; DATA analysis; DATA analysis software; STATISTICAL models; DESCRIPTIVE statistics - Source:
- Additional Information
- Subject Terms:
- Abstract: The natural abundance of 15N in animal proteins (δ15Nanimal) is greater than that in the diet consumed by the animals (δ15Ndiet), with a discrimination factor (Δ15N = δ15Nanimal− δ15Ndiet) that is known to vary according to nutritional conditions. The objectives of the present study were to test the hypothesis that Δ15N variations depend on the efficiency of nitrogen utilisation (ENU) in growing beef cattle, and to identify some of the physiological mechanisms responsible for this N isotopic fractionation in ruminants. Thus, we performed the regression of the Δ15N of plasma proteins obtained from thirty-five finishing beef cattle fed standard and non-conventional diets against different feed efficiency indices, including ENU. We also performed the regression of the Δ15N of different ruminant N pools (plasma and milk proteins, urine and faeces) against different splanchnic N fluxes obtained from multi-catheterised lactating dairy cows. The Δ15N of plasma proteins was negatively correlated with feed efficiency indices in beef cattle, especially ENU (body protein gain/N intake) and efficiency of metabolisable protein (MP) utilisation (body protein gain/MP intake). Although Δ15N obtained from different N pools in dairy cows were all negatively correlated with ENU, the highest correlation was found when Δ15N was calculated from plasma proteins. Δ15N showed no correlation with urea-N recycling or rumen NH3 absorption, but exhibited a strong correlation with liver urea synthesis and splanchnic amino acid metabolism, which points to a dominant role of splanchnic tissues in the present N isotopic fractionation study. [ABSTRACT FROM PUBLISHER]
- Abstract: Copyright of British Journal of Nutrition is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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