The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination

Animal nitrogen (N) partitioning is a key parameter for profitability and sustainability of ruminant production systems, which may be predicted from N isotopic discrimination or fractionation (Δ15N). Both animal genetics and feeding level may interact and impact on N partitioning. Therefore, this st...

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Autores principales:	H. Khanaki, R.J. Dewhurst, B.J. Leury, G. Cantalapiedra-Hijar, G.R. Edwards, C. Logan, L. Cheng
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Biomarker Nitrogen-15 Small ruminants Stable isotope Sustainability Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/ff23a4eb23db4c16bc2da41d4158d4f1
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spelling	oai:doaj.org-article:ff23a4eb23db4c16bc2da41d4158d4f12021-11-12T04:28:29ZThe effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination1751-731110.1016/j.animal.2021.100400https://doaj.org/article/ff23a4eb23db4c16bc2da41d4158d4f12021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1751731121002433https://doaj.org/toc/1751-7311Animal nitrogen (N) partitioning is a key parameter for profitability and sustainability of ruminant production systems, which may be predicted from N isotopic discrimination or fractionation (Δ15N). Both animal genetics and feeding level may interact and impact on N partitioning. Therefore, this study aimed to assess the interactive effects of genetic merit (G) and feed allowance (F) on N partitioning and Δ15N in sheep. The sheep were drawn from two levels of G (high G vs. low G; based on New Zealand Sheep Improvement Limited (http://www.sil.co.nz/) dual (wool and meat) growth index) and allocated to two levels of F (1.7 (high F) vs. 1.1 (low F) times Metabolisable Energy requirement for maintenance) treatments. Twenty-four Coopworth rams were divided into four equal groups for a N balance study: high G × high F, high G × low F, low G × high F, and low G × low F. The main factors (G and F) and the interaction term were used for 2-way ANOVA and regression analysis. Higher F led to higher N excretions (urinary N (UN); faecal N (FN); manure N), retained N, N use efficiency (NUE), and urinary purine derivatives excretion (P < 0.05). On the other hand, higher UN/N intake, and plasma Δ15N were observed with the lower F (P < 0.05). Higher G led to increased UN, FN, manure N, apparent N digestibility, and urinary purine derivatives excretion (P < 0.05). Higher F only increased UN in high G sheep, with no effect on low G sheep (P < 0.05). Regression analysis results demonstrated potential to use plasma Δ15N to reflect the effects of G and F on NUE and UN/N intake. Further research is urged to study interactive effects of genetic and feeding level on sheep N partitioning.H. KhanakiR.J. DewhurstB.J. LeuryG. Cantalapiedra-HijarG.R. EdwardsC. LoganL. ChengElsevierarticleBiomarkerNitrogen-15Small ruminantsStable isotopeSustainabilityAnimal cultureSF1-1100ENAnimal, Vol 15, Iss 12, Pp 100400- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biomarker Nitrogen-15 Small ruminants Stable isotope Sustainability Animal culture SF1-1100
spellingShingle	Biomarker Nitrogen-15 Small ruminants Stable isotope Sustainability Animal culture SF1-1100 H. Khanaki R.J. Dewhurst B.J. Leury G. Cantalapiedra-Hijar G.R. Edwards C. Logan L. Cheng The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
description	Animal nitrogen (N) partitioning is a key parameter for profitability and sustainability of ruminant production systems, which may be predicted from N isotopic discrimination or fractionation (Δ15N). Both animal genetics and feeding level may interact and impact on N partitioning. Therefore, this study aimed to assess the interactive effects of genetic merit (G) and feed allowance (F) on N partitioning and Δ15N in sheep. The sheep were drawn from two levels of G (high G vs. low G; based on New Zealand Sheep Improvement Limited (http://www.sil.co.nz/) dual (wool and meat) growth index) and allocated to two levels of F (1.7 (high F) vs. 1.1 (low F) times Metabolisable Energy requirement for maintenance) treatments. Twenty-four Coopworth rams were divided into four equal groups for a N balance study: high G × high F, high G × low F, low G × high F, and low G × low F. The main factors (G and F) and the interaction term were used for 2-way ANOVA and regression analysis. Higher F led to higher N excretions (urinary N (UN); faecal N (FN); manure N), retained N, N use efficiency (NUE), and urinary purine derivatives excretion (P < 0.05). On the other hand, higher UN/N intake, and plasma Δ15N were observed with the lower F (P < 0.05). Higher G led to increased UN, FN, manure N, apparent N digestibility, and urinary purine derivatives excretion (P < 0.05). Higher F only increased UN in high G sheep, with no effect on low G sheep (P < 0.05). Regression analysis results demonstrated potential to use plasma Δ15N to reflect the effects of G and F on NUE and UN/N intake. Further research is urged to study interactive effects of genetic and feeding level on sheep N partitioning.
format	article
author	H. Khanaki R.J. Dewhurst B.J. Leury G. Cantalapiedra-Hijar G.R. Edwards C. Logan L. Cheng
author_facet	H. Khanaki R.J. Dewhurst B.J. Leury G. Cantalapiedra-Hijar G.R. Edwards C. Logan L. Cheng
author_sort	H. Khanaki
title	The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
title_short	The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
title_full	The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
title_fullStr	The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
title_full_unstemmed	The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
title_sort	effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/ff23a4eb23db4c16bc2da41d4158d4f1
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The effect of sheep genetic merit and feed allowance on nitrogen partitioning and isotopic discrimination

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