Published online by Cambridge University Press: 20 November 2017
Concentrate supplementation at grass enables the higher genetic merit cow to perform closer to her production potential (McGilloway and Mayne, 1996). Responses to concentrate supplementation are usually greater in late summer and autumn as availability and quality of grazing declines. The objective of this study was to quantify milk production responses when early lactation, high yielding dairy cows at grass, were supplemented with high levels of concentrates, over the late summer period.