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Utilization of Milk Urea Concentration to Study Nitrogen Use Efficiency in Haouz Dairy Herds of Central Morocco

Napoléon Munyaneza, Youssef EL Hachimi.

This study was conducted on 10 commercial dairy herds, over one year to explore effects of feeding strategies on milk urea concentrations as a predictor of efficiency of N utilization and urinary N excretion in dairy cows. Milk samples were collected monthly and analyzed for milk urea concentrations using a colorimetric procedure. Feed samples were characterized and their concentrations of protein digestible in the intestine and net energy for lactation were calculated according to the French system. Regression equations were performed to predict N in milk and urinary N excreting. Averages values were 28.3±2.1 mg.dl-1 for milk urea concentration, 26.8±5.1% for efficiency of N utilization and 178±16.2g/d for urinary N excreting. Significant correlation between urea in milk and crude protein content, milk production and urinary N excretion was observed (p

Key words: Crude Protein, Dairy Cows, Nitrogen Utilization, Milk Urea Concentration, Nitrogen Intake, Nitrogen Losses

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