Influence of Feed Upon the Composition of Milk. I. High versus Low Fiber Ration

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Abstract
Based on an 8-week hot weather single-reversal feeding trial involving 2 lots of 10 cows each, 5 Holstein and 5 Jersey, the following information was obtained. Ration B containing 63% more crude fiber and 14% more dry matter than Ration C resulted in highly significant mean differences in favor of Ration B with respect to per cent TS (total solids) and per cent fat when comparing weekly averages of all 20 cows. Mean differences based on individual cow 4-week averages were highly significant with respect to conductivity at 37 C and per cent fat, and significant with respect to per cent TS, all in favor of ration B. Mean significant differences based on individual cow 4-week averages for Holstein cows only was per cent solids-not-fat in favor of Ration B, whereas for Jersey cows both conductivity at 37 C and per cent fat were highly significant and conductivity at 0 C was significant in favor of Ration B. Milk of cows of both breeds showed lower freezing point depression on Ration C than on Ration B.