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1 Département des Sciences Animales, Pavillon Paul-Comtois, Université Laval, Sainte-Foy, QC, Canada G1K 7P4
2 Service de la Zootechnie, Direction de la Recherche et du Développement, Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec, Deschambault, QC, Canada G0A 1S0
Twenty-four multiparous Holstein cows (48 d in lactation) were used in an 8-wk trial employing a completely randomized block design to determine the effect of heat treatment of full fat soybeans on the fatty acid composition of milk fat. Treatments consisted of a total mixed ration supplemented with 1) ground raw, 2) extruded, 3) micronized, or 4) roasted soybeans included at 17.5% of the dry matter of the total mixed ration. Dietary treatment had no effect on body weight, yields of milk or solids-corrected milk, fat percentage, or yield of milk fat or protein. Cows fed ground raw soybeans had a higher dry matter intake and a higher percentage of protein in milk than those fed heat-treated soybeans. The concentrations of saturated fatty acids from C8:0 to C16:0 were lower, and cis-
-9-C18:1 tended to be higher, in the milk fat of cows fed heat-treated soybeans than in the milk fat of cows fed ground raw soybeans. The concentration of trans--11-C18:1 was lowest for cows fed ground raw soybeans, intermediate for cows fed micronized and roasted soybeans, and highest for cows fed extruded soybeans. Cows fed extruded soybeans had lower concentrations of C18:2 and C18:3 than did cows fed micronized or roasted soybeans; cows fed ground raw soybeans had intermediate concentrations of C18:2 and C18:3
Key Words: milk fatty acids • full fat soybeans • heat treatment • dairy cows
Submitted on November 17, 1995
Accepted on May 17, 1996
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