Performance and profiles of milk fatty acids of cows fed full fat, heat-treated soybeans using various processing methods

• Published in: Journal of dairy science 1997-02, Vol.80 (2), p.334-342
• Main Authors: Chouinard, P.Y, Girard, V, Brisson, G.J
• Format: Article
• Language: English
• Subjects: ACIDE GRAS; ACIDOS GRASOS; Animal Feed - analysis; Animal productions; Animals; Biological and medical sciences; BODY WEIGHT; Cattle - physiology; CONTENIDO DE LIPIDOS; CONTENIDO DE MATERIA SECA; CONTENIDO DE NITROGENO; DAIRY COWS; Dietary Fats - administration & dosage; DRY MATTER CONTENT; Eating; EFFICACITE ALIMENTAIRE; EFICIENCIA DE CONVERSION DEL PIENSO; EXTRUSION; FATTY ACIDS; Fatty Acids - analysis; FEED CONVERSION EFFICIENCY; FEED INTAKE; Feeding. Feeding behavior; Female; Food Handling; Fundamental and applied biological sciences. Psychology; Glycine max - chemistry; GRASA DE LA LECHE; GRILLAGE; HEAT TREATMENT; Hot Temperature; INGESTION DE PIENSOS; Lactation; LIPID CONTENT; MATIERE GRASSE DU LAIT; MICRONISATION; MICRONIZACION; MICRONIZATION; Milk - chemistry; MILK FAT; MILK PROTEIN; MILK YIELD; MILLING; MOLIENDA; MOUTURE; NITROGEN CONTENT; PESO CORPORAL; POIDS CORPOREL; PRISE ALIMENTAIRE (ANIMAUX); PROTEINAS DE LA LECHE; PROTEINE DU LAIT; RENDEMENT LAITIER; RENDIMIENTO LECHERO; ROASTING; SOJA; SOYBEANS; TENEUR EN AZOTE; TENEUR EN LIPIDES; TENEUR EN MATIERE SECHE; Terrestrial animal productions; TOSTADO; TRAITEMENT THERMIQUE; TRATAMIENTO TERMICO; VACAS LECHERAS; VACHE LAITIERE; Vertebrates; Vertebrates: anatomy and physiology, studies on body, several organs or systems
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.S0022-0302(97)75943-5

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-delta-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-delta-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