Effect of feeding different fat sources on milk production and composition and blood metabolites in Hostein dairy cow during transition period

The aim of this study was to investigate the effects of different sources of fat on milk production and composition and blood metabolites during the transition period in the Holstein dairy cow. Sixty multiparous Holstein cows were chosen randomly according to expected parturition. Cows were assigned to 3 groups from 21 days prior to calving until 21 days postpartum. Groups included: 1. control diet with protected palm oil (n = 20), 2. extruded linseed (n =20) and 3. soybean whole roast (n= 20). The diets were similar in dry matter and crude protein content but were different in fat sources. Milk production and composition were measured weekly. Blood samples collected weekly to measure glucose, beta-hydroxybutyrate (BHBA), non-esterified fatty acids (NEFA), high density lipoprotein (HDL), triglycerides and total cholesterol. Results showed milk yield and DMI were not affected by experimental diets (P > 0.05). Milk compositions were similar (P > 0.05) among diets, except milk fat percentage and milk fat yield which was affected by experimental diets (P