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Response of Calves Fed ad Libitum to Variations in Milk Diet Composition

Department of Dairy Science, University of Florida, Gainesville 32601

ABSTRACT

Sixteen calves were fed milks ad libitum 2 through 22 days of age to study the effect of differences in composition and energy concentrations upon intake, growth, and efficiency of energy utilization for body weight gains. Diets were whole milk, whole milk diluted with 1.17 parts of water, nonfat milk, and nonfat milk diluted with equal parts of water. Weight gains on the respective diets averaged 20.4, 16.2, 15.9, and 11.9 kg, and all differed significantly (P < 0.05) except for the comparison between diluted whole milk versus nonfat. Kilocalories of metabolizable energy above resting metabolism consumed per gram of gain averaged 4.46, 3.17, 2.28, and 1.60, and all comparisons differed significantly (P < 0.05) except for that between nonfat and diluted nonfat milks. When these values were adjusted for energy intake, metabolizable energy in all diets was used with equal efficiency. Thus, dilution of diet or removal of most milk fat did not affect efficiency of energy utilization.