Effect of dietary energy and protein concentration on the concentration of milk urea nitrogen in dairy ewes

Journal of Dairy Science
A CannasA Nudda

Abstract

To study the effects of dietary crude protein (CP) and energy on milk urea N concentrations in dairy sheep, eight pelleted total mixed rations were prepared to obtain two levels of energy density (1.65 and 1.55 Mcal of net energy for lactation per kilogram of dry matter for high energy and low energy rations, respectively) and four concentrations of CP within each energy level (mean CP concentrations, 14.0, 16.4, 18.7, and 21.2% of dry matter). The experimental design consisted of two 4 x 4 Latin squares (one per energy level) with two replications per treatment within each 3-wk period. Milk urea N concentrations were similar between dietary energy levels. Within each energy level, milk urea N was linearly and positively associated with dietary CP content and intake (range of milk urea N concentrations, 12.2 to 25.8 mg/dl for ewes fed high energy rations and 12.9 to 26.7 mg/dl for ewes fed low energy rations). The comparison of these results with those from other trials suggested that milk and blood urea N concentrations are closely correlated with dietary CP concentrations and less closely correlated with dietary CP intake. Our results suggest that milk or blood urea N concentrations can be used as indicators of protein metabo...Continue Reading

References

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Citations

Mar 20, 2008·Journal of Dairy Science·C M MikolayunasS R Eckerman
Sep 20, 2002·Acta Veterinaria Hungarica·Martina BaumgartnerW Baumgartner
Aug 25, 2009·Journal of Dairy Science·C Mikolayunas-SandrockY M Berger
Feb 24, 2001·Journal of Dairy Science·S M GoddenJ H Lumsden
Jun 22, 2001·Journal of Dairy Science·S M GoddenJ H Lumsden
Apr 2, 2020·Animals : an Open Access Journal From MDPI·Ewa Pecka-KiełbAnna E Zielak-Steciwko
Dec 15, 2019·Animals : an Open Access Journal From MDPI·Valeria GiovanettiGiovanni Molle

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