Abstract
SUMMARY1. Twenty-four Ayrshire cows were used in a changeover experiment to investigate the effects on milk yield of offering concentrates at three rates of feeding (220, 250 and 290 g SE/kg milk) and two nutrient densities (63·5 and 72·5 SE). Nutrient density had no effect on milk yield but there was a positive relationship between rate of feeding and persistency.2. A regression equation relating log10 (—log10 persistency) to the rate of feeding (g SE/kg milk) was fitted to the data and accounted for 92·3 % of the variation between treatments.
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