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Feeding Polyunsaturated Vegetable Oils to Lactating Cows

U. S. Department of Agriculture, ARS, Beltsville, MD and Philadelphia, PA

ABSTRACT

Holstein cows fed concentrate:hay diets also were fed for 14 days supplements of soybean oil plus casein, soybean oil protected from ruminal hydrogenation by encapsulation in a casein-formaldehyde matrix, cottonseed oil plus casein, or cottonseed oil protected with casein-formaldehyde. The supplements were fed at rates to give a linoleic acid (18:2) intake of 225 g/day. Yields of milk and milk protein were not affected by treatment. Milk 18:2 was not increased by the unprotected soybean oil or cottonseed oil but was increased by protected soybean and cottonseed oil from a control of 2.3 to 5.7% of total milk fat. Milk 18:0 and 18:1 also increased. Compensatory declines were observed in milk 16:0 and 14:0 acids. In fecal fatty acids during the treatment periods, percentage of 18:2 of the total fat decreased and 18:0 markedly increased. These results indicate hydrogenation of the dietary oils in the alimentary tract or a differential absorption. Fecal 16:0 and 14:0 decreased.

¹ USDA, ARS, Nutrition Institute, Ruminant Nutrition Laboratory, Beltsville, MD 20705.

² USDA, ARS, Animal Physiology and Genetics Institute, Nutrient Utilization Laboratory, Beltsville, MD 20705.

³ USDA, ARS, Eastern Regional Research Center, Dairy Laboratory, Philadelphia, PA 19118.

⁴ Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.

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