Energy-mineral supplementation during the gestation-lactation transition period in Holstein cows
Abstract
contributions of Cu and Zn did not cover the requirements in both study groups. The metabolizable energy was deficient in the animals that were not supplemented with corn. In the cows from the treated group, the concentrations in blood serum of P, Cu, Zn and cholesterol, and the body condition were higher (P <0.05) at 30 and 60 days postpartum. Total proteins increased (P <0.05) at 60 days postpartum, while betehydroxybutyrate decreased (P <0.01) at 30 days postpartum.The supplementation decreased (P <0.05) the parturition-first service interval, the services per gestation (P <0.001) and the parturition-conception and parturition-parturition intervals. It is concluded that energy-mineral supplementation improves the metabolic profile and reproductive indicators.
Key words: energy, protein, deficit, metabolic profile, reproductive indicators
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