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Protein Supplementation of an Alfalfa Hay-Sorghum Grain Ration for Cows in Early Lactation¹

Departments of Animal Sciences and Statistics, Kansas State University, Manhattan 66506

ABSTRACT

We evaluated supplementing an alfalfa hay-sorghum grain ration with soybean oil meal in an alternating-treatment, single-reversal trial involving 37 comparisons and 23 Holstein cows in early lactation during 1974 to 1976. Data were collected for a week after a 1-wk preliminary period for each treatment. Intakes of dry matter and protein and production of milk for control and soybean meal treatments were 18.8 and 18.7 kg/day, 2.87 and 3.47 kg/day, and 29.9 and 31.0 kg/day. Percentages of milk fat, protein, ash, and total solids were not influenced by the treatments. Net efficiency of protein (feed protein minus maintenance requirement) averaged 80 g per kg milk and 2,98 g per g milk protein for the control treatment.

¹ Contribution No. 78-278-J, Departments of Animal Sciences and Industry and Statistics, Agricultural Experiment Station, Kansas State University, Manhattan 66506.