Milk Production and Composition, and Intake of Holstein Lactating Cows Fed Diets with Partial Substitution of Soybean Meal with Flaked Field Pea

The objective of this study was to investigate the effect of a partial substitution of soybean meal with field pea (Pisum sativum) in Holstein lactating dairy cow diets on dry matter intake, milk yield and composition, blood metabolites, rumen ammonia-N concentration and pH. Eighteen lactating Holstein cows were ran-domly assigned into three groups based on parity, days in milk, and milk yield. Flaked field peas replaced soybean meal (SBM) at the levels of 0.0, 33 and 66% (P0, P33 and P66, respectively) and were fed to the animals for 33 days. Dry matter intake, milk yield, milk fat and protein content, blood metabolites, rumen ammonia-N concentration and pH were not significantly (P<0.05) affected by the diets. The results of this study demonstrated that field pea could safely replace soybean meal up to 66% in the diet of high-producing dairy cows.