Effects of feeding saturated and unsaturated fatty acids in the prepartum period on milk production and blood parameters in multiparous Holstein lactating dairy cows

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This study was carried out to determine the effect of different fatty acids (fatty acid profile) in close – up period on production performance, milk composition and blood parameters of lactating dairy cows. In this study, 15 Holstein cows were selected by the expected date of parturition (around 30 days before calving) and were randomly assigned in three groups with five cows. Three iso-nitrogenous diets differing in energy contents were fed in close up period. Experimental treatments were 1) control (without fat), 2) rumen-protected fat (RF) (saturated fatty acids) and 3) Roasted Soybean (RS) (unsaturated fatty acids). After calving, all cows were fed with similar diets. Cows’ performance, daily milk production, milk composition, dry matter intake, body condition score were recorded. Also blood samples were collected at 7 day intervals in -21, -14, -7, 1, 7, 14, 21 periods of calving. Dry matter intake and body condition score were not affected by fat supplementation. Corrected milk yield based on 3.5 and 4 percentage of fat and milk production, fat, lactose and protein production in cows that were fed fat diet were higher than control cows. But, the percentage of protein and lactose milk in the control group was higher than other groups. Glucose and cholesterol concentration in day of calving and cholesterol concentrate after calving in RS group was higher than RF group. Also glucose concentrate after calving in the control group was higher than RF group. The results indicate that rumen-protected fat and roasted soybean can be supplemented to dairy cows diet to increase milk production, Moreover, roasted soybean supplementation improve metabolic condition in dairy cows. 

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