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Journal of Dairy Science Vol. 60 No. 4 591-595
© 1977 by American Dairy Science Association ®
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Evaluation of Sunflower Meal as a Protein Supplement for Lactating Cows1

D. J. Schingoethe, J. A. Rook and F. Ludens

Dairy Science Department, South Dakota State University, Brookings 57006

ABSTRACT

Isonitrogenous concentrate rations containing 60% of the crude protein from either soybean meal (50% crude protein) or sunflower meal (37% crude protein) were fed at 1 kg/3 kg milk produced to 10 cows each during a 16-wk lactation trial. All cows received corn silage ad libitum and 2.5 kg alfalfa-brome hay daily. Milk yields and composition were not affected by diet. Averages for soybean meal and sunflower meal fed cows were: milk, 21.2 and 21.1 kg/day; fat, 3.96 and 3.87%; protein, 3.44 and 3.44%; and solids-not-fat, 8.85 and 8.89%. Milk casein nitrogen, serum protein nitrogen, and nonprotein nitrogen concentrations were not affected by ration. Feed composition and changes in body weight were not affected by ration. Ruminal ammonia 3 to 4 h postfeeding was slightly higher (8.62 versus 7.17 mg/100 ml) in sunflower meal-fed cows, possibly reflecting the greater solubility of the sunflower meal protein in the rumen. Volatile fatty acids in the rumen were not affected by ration although concentrations of several acids tended to be higher in cows fed sunflower meal. Rumen pH was lower in sunflower meal-fed cows. Protein from sunflower meal is equivalent to that from soybean for lactating cows.

FOOTNOTES

1 Published with the approval of the Director, South Dakota Agricultural Experiment Station as Publication No. 1446 of the Journal Series.






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Copyright © 1977 by the American Dairy Science Association ®.