The Economic and Nutritional-Physiological Aspects of Dairy Cows Are Influenced by the Different Sources of Dietary Starch
محورهای موضوعی :
1 - Department of Animal Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran
2 - Department of Animal Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran
کلید واژه: dairy cow, efficiency, milk production, nutrient digestibility, starch,
چکیده مقاله :
This study utilized a Latin square experimental design to assess the effects of different nonstructural carbo-hydrate sources on milk production, nutrient digestibility, nitrogen and energy utilization efficiency, and plasma metabolites in 32 multiparous dairy cows. The cows, with an average of 130 ± 13 days-in-milk, produced milk at a rate of 45 ± 2.4 kg, and had a live weight of 656 ± 27 kg, were fed diets formulated based on National Research Council (NRC) recommendations. Our results indicated that cows fed a corn-based diet exhibited a higher milk fat percentage compared to those fed other diets. Additionally, diets con-taining wheat, barley, or corn improved milk production efficiency, as measured by the ratio of milk pro-duction to dry matter intake and net energy of milk to net energy intake, compared to diets containing pota-toes. Furthermore, cows on wheat or corn diets showed enhanced digestibility of dry matter, organic matter, crude protein, and crude fat compared to those on barley or potato diets. Notably, a diet based on potatoes resulted in significantly increased triglyceride levels in plasma. These findings underscore the impact of carbohydrate source on milk yield, nutrient utilization, and metabolic profile, highlighting the importance of selecting appropriate nonstructural carbohydrates for optimizing dairy cow performance.
This study utilized a Latin square experimental design to assess the effects of different nonstructural carbo-hydrate sources on milk production, nutrient digestibility, nitrogen and energy utilization efficiency, and plasma metabolites in 32 multiparous dairy cows. The cows, with an average of 130 ± 13 days-in-milk, produced milk at a rate of 45 ± 2.4 kg, and had a live weight of 656 ± 27 kg, were fed diets formulated based on National Research Council (NRC) recommendations. Our results indicated that cows fed a corn-based diet exhibited a higher milk fat percentage compared to those fed other diets. Additionally, diets con-taining wheat, barley, or corn improved milk production efficiency, as measured by the ratio of milk pro-duction to dry matter intake and net energy of milk to net energy intake, compared to diets containing pota-toes. Furthermore, cows on wheat or corn diets showed enhanced digestibility of dry matter, organic matter, crude protein, and crude fat compared to those on barley or potato diets. Notably, a diet based on potatoes resulted in significantly increased triglyceride levels in plasma. These findings underscore the impact of carbohydrate source on milk yield, nutrient utilization, and metabolic profile, highlighting the importance of selecting appropriate nonstructural carbohydrates for optimizing dairy cow performance.
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