Lactational evaluation of protein supplements of varying ruminal degradabilities

• Published in: Journal of dairy science 1997-02, Vol.80 (2), p.385-392
• Main Authors: Henson, J.E, Schingoethe, D.J, Maiga, H.A
• Format: Article
• Language: English
• Subjects: ACIDE AMINE; ACIDE GRAS VOLATIL; ACIDO GRASO VOLATIL; ALIMENT CONCENTRE POUR ANIMAUX; AMINO ACIDS; Amino Acids - administration & dosage; Amino Acids - metabolism; AMINOACIDOS; Animal productions; Animals; ARTERE; ARTERIAS; ARTERIES; Biological and medical sciences; Blood; BLOOD MEAL; BLOOD PLASMA; BLOOD VEINS; BODY CONDITION; BODY WEIGHT; BONE MEAL; Cattle - physiology; COMPLEMENT ALIMENTAIRE; CONCENTRATES; CONDICION CORPORAL; CONTENIDO DE LIPIDOS; CONTENIDO DE MATERIA SECA; CONTENIDO PROTEICO; CONTEO DE CELULAS SOMATICAS; CRUDE PROTEIN; DAIRY COWS; DIET; DIETA; Dietary Proteins - administration & dosage; Dietary Proteins - metabolism; DRY MATTER CONTENT; ETAT CORPOREL; FARINE D'OS; FARINE DE SANG; FARINE DE VIANDE; Fatty Acids, Volatile - metabolism; FEED FORMULATION; FEED INTAKE; Feeding. Feeding behavior; Female; Fermentation; FLUIDE DU RUMEN; FLUIDO DEL RUMEN; FORMULACIONES; FORMULATION; FORMULATIONS; Fundamental and applied biological sciences. Psychology; GAIN DE POIDS; GANANCIA DE PESO; GLUTEN; Glycine max; GRASA DE LA LECHE; HARINA DE CARNE; HARINA DE HUESOS; HARINA DE SANGRE; Hydrogen-Ion Concentration; INGESTION DE PIENSOS; Lactation - physiology; LACTOSA; LACTOSE; LIPID CONTENT; LIVEWEIGHT GAIN; MAIS; MAIZ; MAIZE; MAIZE GLUTEN MEAL; MATIERE GRASSE DU LAIT; Meat; MEAT MEAL; Milk - chemistry; MILK FAT; MILK PROTEIN; MILK YIELD; NUMERATION CELLULAIRE SOMATIQUE; PESO CORPORAL; PIENSOS CONCENTRADOS; PLASMA SANGUIN; PLASMA SANGUINEO; POIDS CORPOREL; PRISE ALIMENTAIRE (ANIMAUX); PROTECTED PROTEIN; PROTEIN CONTENT; PROTEINA BRUTA; PROTEINAS; PROTEINAS DE LA LECHE; PROTEINE; PROTEINE BRUTE; PROTEINE DU LAIT; PROTEINS; REGIME ALIMENTAIRE; RENDEMENT LAITIER; RENDIMIENTO LECHERO; Rumen - metabolism; RUMEN FLUID; SEBO; SOMATIC CELL COUNT; SOYBEAN MEAL; SOYBEAN OILMEAL; SUIF; SUPLEMENTOS; SUPPLEMENTS; TALLOWS; TENEUR EN LIPIDES; TENEUR EN MATIERE SECHE; TENEUR EN PROTEINES; Terrestrial animal productions; TORTAS DE SOJA; TOURTEAU DE SOJA; VACAS LECHERAS; VACHE LAITIERE; VEINE; VENAS; Vertebrates; Vertebrates: anatomy and physiology, studies on body, several organs or systems; VOLATILE FATTY ACIDS; WEIGHT GAIN; Zea mays
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.S0022-0302(97)75948-4

Twelve lactating Holstein cows (9 multiparous and 3 primiparous) were used in a replicated 3 x 3 Latin square design with three periods of 4 wk each to evaluate diets containing three protein supplements that varied in ruminally undegradable protein and amino acid (AA) composition. Diets contained either 44% crude protein (CP) solvent-extracted soybean meal, expeller (mechanically extracted) soybean meal, or a blend of animal and vegetable proteins as the protein supplement. The animal and vegetable blend consisted of equal portions of protein from blood meal, corn gluten meal, meat and bone meal, and soybean meal. All diets contained 33.3% alfalfa haylage, 16.7% corn silage, and 50% of the respective concentrate mix (dry matter basis). Diets contained 17.4, 17.8, and 17.8% CP and 34, 45, and 45% of CP as ruminally undegradable protein, respectively. Dry matter intake, milk production and composition, and body weight were similar among treatments. Uptakes of AA by the mammary gland were similar among treatments. The apparent first-limiting AA for each diet was likely Met, but Lys and Phe were also potentially limiting. Varying degrees of protein degradability and AA composition within the range of this study did not affect lactational responses, indicating that all of these protein supplements were adequate to support milk production