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

Department of Dairy Science, Texas Agricultural Experiment Station, College Station

ABSTRACT

Based on an 8-wk. hot-weather, single-reversal feeding trial involving two lots of ten cows each—five Holstein and five 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 T.S. and per cent fat, when comparing weekly averages of all 20 cows. Mean differences based on individual cow 4-wk. averages were highly significant with respect to conductivity at 37° C. and per cent fat, and significant with respect to per cent T.S., all in favor of Ration B.

Mean significant differences based on individual cow 4-wk. averages for Holstein cows only was per cent S.N.F. 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 depressions on Ration C than on Ration B.