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

Research output: Contribution to journalArticlepeer-review

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Abstract

The study aimed to identify suitable predictors of nitrogen (N) use efficiency (NUE; milk N/N intake) for cows differ in breeds and 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 crude protein 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 languageEnglish
Pages (from-to)435-451
JournalDairy
Early online date16 Aug 2021
DOIs
Publication statusFirst published - 16 Aug 2021

Keywords

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

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