Estimation of nitrogen use efficiency for ryegrass-fed dairy cows: model development using diet and animal-based proxy measures

Wumaierjiang Aizimu; Omar Al-Marashdeh; Simon Hodge; RJ Dewhurst; Ao Chen; Guangyong Zhao; Saranika Talukder; Grant R. Edwards; Long Cheng

doi:10.3390/dairy2030035

Estimation of nitrogen use efficiency for ryegrass-fed dairy cows: model development using diet and animal-based proxy measures

Wumaierjiang Aizimu, Omar Al-Marashdeh^*, Simon Hodge, RJ Dewhurst, Ao Chen, Guangyong Zhao, Saranika Talukder^*, Grant R. Edwards, Long Cheng^*

^*Corresponding author for this work

Dairy Research Centre

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

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Abstract

This study aimed to identify suitable predictors of nitrogen (N) use efficiency (NUE; milk N/N intake) for cows that differed in breeds and were fed with ryegrass pasture, using existing data from the scientific literature. Data from 16 studies were used to develop models based on the relationships between NUE and dietary and animal-based factors. Data from a further 10 studies were used for model validation. Milk urea N (MUN) and dietary water-soluble carbohydrate-to-crudeprotein ratio (WSC/CP) were the best and most practical animal- and diet-based proxies to predict NUE. The results indicate that it might be necessary to adopt separate models for different breeds when using WSC/CP to predict NUE but not when using MUN.

Original language	English
Pages (from-to)	435-451
Number of pages	17
Journal	Dairy
Volume	2
Issue number	3
Early online date	16 Aug 2021
DOIs	https://doi.org/10.3390/dairy2030035
Publication status	First published - 16 Aug 2021

Keywords

Crude protein
Friesian
Jersey
Dairy cow
milk urea nitrogen
Soluble carbohydrates
N-use efficiency
soluble carbohydrates
crude protein

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10.3390/dairy2030035Licence: CC BY

dairy-1274282Accepted author manuscript, 220 KBLicence: CC BY
dairy-02-00035Final published version, 1.29 MBLicence: CC BY

Cite this

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title = "Estimation of nitrogen use efficiency for ryegrass-fed dairy cows: model development using diet and animal-based proxy measures",

abstract = "This study aimed to identify suitable predictors of nitrogen (N) use efficiency (NUE; milk N/N intake) for cows that differed in breeds and were fed with ryegrass pasture, using existing data from the scientific literature. Data from 16 studies were used to develop models based on the relationships between NUE and dietary and animal-based factors. Data from a further 10 studies were used for model validation. Milk urea N (MUN) and dietary water-soluble carbohydrate-to-crudeprotein ratio (WSC/CP) were the best and most practical animal- and diet-based proxies to predict NUE. The results indicate that it might be necessary to adopt separate models for different breeds when using WSC/CP to predict NUE but not when using MUN.",

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author = "Wumaierjiang Aizimu and Omar Al-Marashdeh and Simon Hodge and RJ Dewhurst and Ao Chen and Guangyong Zhao and Saranika Talukder and Edwards, {Grant R.} and Long Cheng",

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AU - Aizimu, Wumaierjiang

AU - Al-Marashdeh, Omar

AU - Hodge, Simon

AU - Dewhurst, RJ

AU - Chen, Ao

AU - Zhao, Guangyong

AU - Talukder, Saranika

AU - Edwards, Grant R.

AU - Cheng, Long

PY - 2021/8/16

Y1 - 2021/8/16

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AB - This study aimed to identify suitable predictors of nitrogen (N) use efficiency (NUE; milk N/N intake) for cows that differed in breeds and were fed with ryegrass pasture, using existing data from the scientific literature. Data from 16 studies were used to develop models based on the relationships between NUE and dietary and animal-based factors. Data from a further 10 studies were used for model validation. Milk urea N (MUN) and dietary water-soluble carbohydrate-to-crudeprotein ratio (WSC/CP) were the best and most practical animal- and diet-based proxies to predict NUE. The results indicate that it might be necessary to adopt separate models for different breeds when using WSC/CP to predict NUE but not when using MUN.

KW - Crude protein

KW - Friesian

KW - Jersey

KW - Dairy cow

KW - milk urea nitrogen

KW - Soluble carbohydrates

KW - N-use efficiency

KW - soluble carbohydrates

KW - crude protein

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JO - Dairy

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ER -

Estimation of nitrogen use efficiency for ryegrass-fed dairy cows: model development using diet and animal-based proxy measures

Abstract

Keywords

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