Effect of feeding different fat sources on milk production and composition and blood metabolites in Hostein dairy cow during transition period
2017
Rajabi, Y. | Chashnidel, Y. | Dirandeh, E.
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 < 0.05) and were less in cows fed control and soybean whole roast diets. Triglycerides, NEFA and BHBA concentrations were significantly lower in cows fed extruded linseed compared to control and soybean whole roast groups (P < 0.05). The overall results showed that feeding diets containing soybean and extruded flaxseed can improve health status by decreasing milk fat percentage, NEFA and BHBA in dairy cows at the transition period.
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