Abstract
Current study evaluated the inclusion of protected fat and different levels of crude protein (CP) in the diet of crossbreed cows in early lactation. Twelve cows were distributed in a 4 x 4 factorial design, with four treatments (12 or 16% CP, with or without MEGALAC-E ® ). Statistical analyzes with ANOVA and Pearson's linear correlation procedures were performed. Protected fat did not affect intake of dry matter (DM) and organic matter (OM) (p > 0.05). Increased CP raised consumption of CP and EE and decreased the non-fiber carbohydrates (NFC; p 0.05) on milk yield and composition due to protected fat or CP rates. Since the inclusion of protected fat and higher content of CP (16%) in the diet did not benefit the production and composition of milk in crossbreed cows, diets with 12% CP without the inclusion of protected fat are recommended.
Highlights
Brazil has the biggest dairy livestock herd in the world and ranks fifth in milk production, with 31 billion liters/year, second only to Russia (32 billions), China (34 billions), United States (91 billions) and India (129 billions) Anuário da pecuária brasileira (ANUALPEC, 2013)
Negative energy balance (NEB) is a physiological stage experienced by dairy cows after giving birth and is caused by the voluntary intake of feed which is insufficient for the nutritional requirements of the animal during this period
Current assay evaluates the inclusion of protected fat and two different protein levels in the diet of crossbreed cows in early lactation on the consumption and digestibility of nutrients, production and physical and chemical composition of milk
Summary
Brazil has the biggest dairy livestock herd in the world and ranks fifth in milk production, with 31 billion liters/year, second only to Russia (32 billions), China (34 billions), United States (91 billions) and India (129 billions) Anuário da pecuária brasileira (ANUALPEC, 2013). Negative energy balance (NEB) is a physiological stage experienced by dairy cows after giving birth and is caused by the voluntary intake of feed which is insufficient for the nutritional requirements of the animal during this period. Protected fat (MEGALAC-E®) has the best concentration of fatty acids Since it is protected by calcium salts, it is neither subjected to microorganisms nor damaged by ruminal fermentation in normal pH conditions. Current assay evaluates the inclusion of protected fat and two different protein levels in the diet of crossbreed cows in early lactation on the consumption and digestibility of nutrients, production and physical and chemical composition of milk
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