Abstract
The influence of three varieties of ryegrass on milk yield and composition was examined using lactating monozygous twin cattle in a series of experiments. During the spring period the mean milk yields produced by the different groups, in decreasing order, were: Manawa ryegrass > Ariki ryegrass > Ruanui ryegrass (P 0.05). In the autumn experiments the cows on the Ruanui ryegrass produced higher milk and butterfat yields than those on the Ariki ryegrass (P < 0.01). Possible reasons for the differences in nutritive value of the ryegrasses are discussed in relation to results of other recent work.
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