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Effects of Source of Protein and Carbohydrate on Ruminal Fermentation and Passage of Nutrients to the Small Intestine of Lactating Cows¹

Department of Animal Sciences, University of Illinois, Urbana 61801

D. R. Nelson

Department of Veterinary Clinical Medicine, University of Illinois, Urbana 61801

ABSTRACT

Four early lactation multiparous Holstein cows were used in a 4 x 4 Latin square to investigate the effects of source of protein (fish meal or soybean meal) and carbohydrate (corn or barley) on ruminal fermentation, flow of nutrients to the small intestine, and animal performance. The treatments, arranged in a 2 x 2 (protein x carbohydrate) factorial were: 1) corn plus soybean meal; 2) corn plus fish meal; 3) barley plus soybean meal; and 4) barley plus fish meal. Dry matter and starch intakes were greater when corn was fed than when barley was fed. Barley-based diets were more extensively degraded in the rumen than corn-based diets and therefore provided more energy for microbial growth. However, passage of amino acids and starch to the duodenum was greater for corn-based diets than barley-based diets, because of the greater intake and lower ruminal degradability of the corn-based diets. Microbial protein constituted a larger portion of the total N and had a greater influence on the pattern and quantity of amino acids that passed to the duodenum than did protein from fish meal or soybean meal, which escaped ruminal degradation. Feeding corn-based diets increased production of milk and milk protein compared with feeding barley-based diets.

¹ Supported in part by the University of Illinois Agricultural Experiment Station.

² Co-operative Feed Dealers, Inc., P.O. Box 670, Chenango Bridge, NY 13745.

³ Monsanto Agricultural Co., BB2K, 700 Chesterfield Village Parkway, St. Louis, MO 63198.

This article has been cited by other articles:

				G. N. Gozho and T. Mutsvangwa Influence of Carbohydrate Source on Ruminal Fermentation Characteristics, Performance, and Microbial Protein Synthesis in Dairy Cows J Dairy Sci, July 1, 2008; 91(7): 2726 - 2735. [Abstract] [Full Text] [PDF]