Effect of replacement of barley meal with crude glycerol on lactation performance of primiparous dairy cows fed a grass silage-based diet

摘要: The use of increasingly available glycerol, from the biodiesel industry, in dairy cow diets was assessed. effects replacement barley meal by crude glycerol a total mixed ration based on grass silage dry matter intake, milk yield and composition, rumen pH, degradability metabolic status mid-lactation Holstein cows were evaluated. Eight, tie-stalled, primiparous assigned to 4 � Latin square experimental design with two per treatment. Cows paired according body weight, one ruminally cannulated each pair. treatment period lasted 21 days which 16 for adaptation. given where replaced isoenergetically 0 kg (control), 1 kg, 2 3 day cow. An increased level diet intake (Po 0.001). Milk composition not affected inclusion diet, exception an increase protein content (Po0.001). had lower concentrations blood nonesterified fatty acids (P¼ 0.038) higher concentration urea Partial environment, as proportions volatile changed. There no effective nutrients. These results indicate that is suitable detrimental effect lactation performance or parameters.