Abstract
The objective was to estimate the influence of genetic merit on milk production at different levels of concentrate feeding. The presence of an interaction between genetic merit and level of feeding would mean that cows with a high potential for milk production are unable to express their potential under all conditions. Oldham and Simm, (1998) showed there was a significant interaction between level of concentrate feeding and PTAf+p under experimental conditions, and that the milk yield response to genetic merit increased with increased concentrate feeding. The current work estimated the value of genetic merit (PIN95 and PTAf+p) on 305-day milk production traits of dairy cattle on commercial farms, where farms were categorised by the level of concentrate (Cg) fed.
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