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Article

Estimation of Nitrogen Use Efficiency for Ryegrass-Fed Dairy Cows: Model Development Using Diet- and Animal-Based Proxy Measures

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College of Animal Science, Tarim University, Alar 843300, Xinjiang, China
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Faculty of Agriculture and Life Sciences, Lincoln University, P.O. Box 85084, Lincoln 7674, Canterbury, New Zealand
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School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland
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Scotland’s Rural College, King’s Buildings, West Mains Road, Edinburgh EH9 3JG, UK
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State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
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Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, VIC 3010, Australia
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Faculty of Veterinary and Agricultural Science, University of Melbourne, Dookie, VIC 3647, Australia
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Authors to whom correspondence should be addressed.
Academic Editor: Monica Isabella Cutrignelli
Dairy 2021, 2(3), 435-451; https://doi.org/10.3390/dairy2030035
Received: 9 June 2021 / Revised: 7 July 2021 / Accepted: 21 July 2021 / Published: 16 August 2021
(This article belongs to the Section Nutrition and Physiology)
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. View Full-Text
Keywords: crude protein; Friesian; Jersey; milk urea nitrogen; soluble carbohydrates crude protein; Friesian; Jersey; milk urea nitrogen; soluble carbohydrates
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MDPI and ACS Style

Aizimu, W.; Al-Marashdeh, O.; Hodge, S.; Dewhurst, R.J.; Chen, A.; Zhao, G.; Talukder, S.; Edwards, G.R.; Cheng, L. Estimation of Nitrogen Use Efficiency for Ryegrass-Fed Dairy Cows: Model Development Using Diet- and Animal-Based Proxy Measures. Dairy 2021, 2, 435-451. https://doi.org/10.3390/dairy2030035

AMA Style

Aizimu W, Al-Marashdeh O, Hodge S, Dewhurst RJ, Chen A, Zhao G, Talukder S, Edwards GR, Cheng L. Estimation of Nitrogen Use Efficiency for Ryegrass-Fed Dairy Cows: Model Development Using Diet- and Animal-Based Proxy Measures. Dairy. 2021; 2(3):435-451. https://doi.org/10.3390/dairy2030035

Chicago/Turabian Style

Aizimu, Wumaierjiang, Omar Al-Marashdeh, Simon Hodge, Richard J. Dewhurst, Ao Chen, Guangyong Zhao, Saranika Talukder, Grant R. Edwards, and Long Cheng. 2021. "Estimation of Nitrogen Use Efficiency for Ryegrass-Fed Dairy Cows: Model Development Using Diet- and Animal-Based Proxy Measures" Dairy 2, no. 3: 435-451. https://doi.org/10.3390/dairy2030035

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