Lactational responses of dairy cows fed unsaturated fat from extruded soybeans or sunflower seeds

• Published in: Journal of dairy science 1996-07, Vol.79 (7), p.1244-1249
• Main Authors: Schingoethe, D. J, Brouk, M. J, Lightfield, K. D, Baer, R. J
• Format: Article
• Language: English
• Subjects: acide gras; acide gras polyinsature; acidos grasos; acidos grasos poliinsaturados; alpha-Linolenic Acid - administration & dosage; Animal Feed; Animal productions; Animals; Biological and medical sciences; Cattle - physiology; composicion aproximada; composition globale; contenido de lipidos; contenido de materia seca; contenido proteico; corps gras; dairy cows; diet; dieta; Dietary Fats, Unsaturated - administration & dosage; dry matter content; fats; fatty acids; feed intake; Female; Fundamental and applied biological sciences. Psychology; Glycine max; graine de tournesol; grasa de la leche; grasas; Helianthus; Hordeum; ingestion de piensos; Lactation - physiology; lactosa; lactose; Linoleic Acid; Linoleic Acids - administration & dosage; lipid content; matiere grasse du lait; Medicago sativa; Milk - chemistry; milk fat; milk protein; Milk Proteins - metabolism; milk yield; polyunsaturated fatty acids; prise alimentaire animaux; protein content; proteinas de la leche; proteine du lait; proximate composition; regime alimentaire; rendement laitier; rendimiento lechero; Seeds; semilla de girasol; soja; soybeans; sunflower seed; teneur en lipides; teneur en matiere seche; teneur en proteines; Terrestrial animal productions; vacas lecheras; vache laitiere; Vertebrates; Zea mays
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.S0022-0302(96)76477-9

Nine multiparous Holstein cows were used in a replicated 3 X 3 Latin square to evaluate the response to diets containing equal amounts of supplemental fat from extruded soybeans or sunflower seeds. Both fat sources contained about 66% polyunsaturated fatty acids; for soybeans, about 8% was linolenic acid, but sunflower seeds contained mostly linoleic acid. Periods were 5 wk, and data were collected the last 3 wk of each period. Total mixed diets were (DM basis) 25% corn silage, 25% alfalfa hay, and 50% concentrate mix. Control concentrate mix contained primarily corn, barley, and soybean meal; extruded soybeans or rolled sunflower seeds replaced portions of the corn, barley, and soybean meal in isonitrogenous (17% CP) diets. Milk yield was higher for cows fed supplemental fat. Percentages of milk fat and protein and DMI were similar for all three dietary treatments. Milk fat from cows fed soybeans or sunflower seeds contained higher concentrations of unsaturated fatty acids and long-chain fatty acids than did milk fat from cows fed the control diet. Milk yield and composition were similar for cows fed soybeans or sunflower seeds. Soybeans or sunflower seeds can be used as dietary fat supplements to increase milk yield and the proportion of unsaturated fatty acids in milk fat.