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Comparative Acceptability and Nutritive Value of Barley, Wheat Mixed Feed, and a Mixed Concentrate Ration in Meal and Pelleted Forms for Lactating Cows^1,2,

Department of Animal Sciences, Washington State University, Pullman 99163

ABSTRACT

Grain rations consisting of 98% barley, 98% wheat mixed feed, and a control mixture of barley, wheat, peas, and cottonseed meal, fed in meal and pelleted forms, were compared in digestion, lactation, and acceptability trials. Alfalfa hay was fed as the only roughage with each grain mixture at a 55 :45 ratio in the lactation and digestion trials and at a 30:70 ratio in the acceptability trial.

Digestibility of dry matter, energy, and total digestible nutrients content of wheat mixed feed rations were lower than barley or control rations. Fed as a meal, wheat mixed feed was consumed at a lower rate than all other grain rations (P < .05) in the acceptability trial.

Cows fed pelleted grain rations in the lactation trial produced more milk, protein, solids-not-fat, fat, and fat-corrected milk than those fed meal rations (P < .10). Differences in production of fat-correeted-milk, percentage solids-not-fat, and percentage protein of milk among meal and pelleted rations were small (P < .10). Pelleting the grain rations resulted in the greatest depression of milk fat percentage for cows in the acceptability trial. Fat depression was not as great for cows on the acceptability trial fed wheat mixed feed, a result associated with greater fiber and lower nitrogen-free extract intake. Mean diurnal levels of rumen volatile fatty acids associated with pelleted rations resulted in an increase in molar.

¹ Scientific Paper no. 3286, College of Agriculture Eesearch Center, Pullman, Washington. Project 1439.

² Taken from data presented by the junior author to the Graduate School of Washington State University in partial fulfillment of the requirements for the M.S. degree.

³ Present Address: Canada Department of Agriculture, Eesearch Station, Agassiz, British Columbia, Canada.

⁴ Present Address: Granja Tibaitata ICA, Apartado Aereo 58-13, Bogota, Colombia.