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Influence of Feed upon the Composition of Milk. II. Low versus High Fat Rations

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

ABSTRACT

Based on a 12-wk. mild weather switch-back feeding trial involving two groups of three Holstein and two Jersey cows each, this information was obtained. The per cent S.N.F. and the per cent lactose in milk from Holstein cows fed a high fat ration with 6% Marcol B-75 (Ration M) were significantly lower than when fed a control ration (Ration B) which contained 63% more crude fiber and no added fat. No significant differences in composition of milk were observed with the Jersey cows when on Rations M and B.

The per cent fat was significantly higher in milk produced by Holsteins fed a high fat ration with 6% stabilized prime tallow (Ration T) than when fed Ration B. However, the per cent S.N.F. and S.N.F.-lactose were significantly higher on Ration B than on Ration T with this breed. With the Jersey, the only significant difference was a higher per cent fat in milk with Ration T than with Ration B.

Holsteins fed on Ration M produced 75 and 70% of all milk samples below Texas minimum requirements for 3.25% fat and 8% S.N.F., respectively. With Ration B the values were 39 and 43%, and with Ration T, 9 and 61% for fat and S.N.F., respectively.

Based on a 13-wk. mild weather continuous feeding trial involving two groups of five Holstein and five Jersey cows each, the following information was obtained. The per cent fat, S.N.F., and S.N.F.-lactose in milk of Holsteins fed a high fat ration with 6% stabilized prime tallow (Ration T) were significantly lower than for the control group fed the regular herd ration (Ration H) without added fat. However, this was true only for Period II (7th to 13th wk. of trial). With the Jersey group the per cent of the alcohol-soluble portion of milk fat was significantly higher with Ration T than with Ration H in Period I (1st to 7th wk. of trial).