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Technical note: Nitrogen isotopic fractionation can be used to predict nitrogen-use efficiency in dairy cows fed temperate pasture

Cheng, Paul; Sheahan, A. J.; Gibbs, Steven J.; Rius, A. G.; Kay, J. K.; Meier, S.; Edwards, Grant; Dewhurst, Richard J.; Roche, J. R. (Oxford University Press on behalf of the American Society of Animal Science, 2013-12)

The objective of this study was to investigate the relationship between nitrogen isotopic fractionation (δ¹⁵N) and nitrogen-use efficiency (milk nitrogen/nitrogen intake; NUE) in pasture-fed dairy cows supplemented with ...

Requirements for zero energy balance of nonlactating, pregnant dairy cows fed fresh autumn pasture are greater than currently estimated

Mandok, K. S.; Kay, J. K.; Greenwood, S. L.; Edwards, Grant; Roche, J. R. (Elsevier on behalf of the American Dairy Science Association, 2013-06)

Fifty-three nonlactating, pregnant Holstein-Friesian and Holstein-Friesian × Jersey cross dairy cows were grouped into 4 cohorts (n = 15, 12, 13, and 13) and offered 1 of 3 allowances of fresh, cut pasture indoors for 38 ...