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
Nov 1, 1992·Journal of Animal Science·C J SniffenJ B Russell
Oct 1, 1991·Journal of Dairy Science·P J Van SoestB A Lewis
Jul 11, 1991·Journal of Dairy Science·G P LynchM J Camp
Mar 1, 1989·Journal of Dairy Science·J D Ferguson, W Chalupa
Dec 1, 1988·Journal of Animal Science·G P LynchL W Douglass
Aug 22, 1987·The Veterinary Record·Q McKellarA Rycroft
Nov 1, 1986·Journal of Animal Science·E R Orskov
Jan 1, 1967·The British Journal of Nutrition·M R Cocimano, R A Leng
Nov 1, 1971·The British Journal of Nutrition·A R Egan, R C Kellaway
Oct 1, 1980·Journal of Dairy Science·J Harmeyer, H Martens
Apr 1, 1994·Experimental Aging Research·D R RoyallJ Cornell
Jan 1, 1964·The British Journal of Nutrition·H TAGARIA BONDI
Citations
Jul 2, 2015·The Journal of Dairy Research·Eleni TsiplakouGeorge Zervas
May 26, 2016·Asian-Australasian Journal of Animal Sciences·Lin WangHajime Kumagai
Mar 20, 2008·Journal of Dairy Science·C M MikolayunasS R Eckerman
Sep 20, 2002·Acta Veterinaria Hungarica·Martina BaumgartnerW Baumgartner
Aug 21, 2010·Journal of Dairy Science·E AbilleiraL J R Barron
Apr 29, 2014·Journal of Dairy Science·L HymøllerM R Weisbjerg
Dec 25, 2010·Journal of Dairy Science·V Tufarelli, V Laudadio
Dec 25, 2010·Journal of Dairy Science·C MikolayunasY M Berger
Jun 1, 2001·Journal of Dairy Science·S M GoddenJ H Lumsden
Jun 22, 2007·Journal of Dairy Science·L A SinclairD E Bauman
Aug 25, 2009·Journal of Dairy Science·C Mikolayunas-SandrockY M Berger
Feb 24, 2001·Journal of Dairy Science·S M GoddenJ H Lumsden
Dec 24, 2011·Journal of Dairy Science·W M P B WeerasingheL A Sinclair
Jun 22, 2001·Journal of Dairy Science·S M GoddenJ H Lumsden
Apr 6, 2000·Journal of Dairy Science·S M GoddenJ S Walton
Dec 5, 2000·Journal of Dairy Science·A BachM D Stern
Jun 28, 2016·Journal of the Science of Food and Agriculture·Ruixia LanInho Kim
Apr 2, 2020·Animals : an Open Access Journal From MDPI·Ewa Pecka-KiełbAnna E Zielak-Steciwko
Feb 3, 2004·Journal of Animal Science·A CannasP J Van Soest
Dec 15, 2019·Animals : an Open Access Journal From MDPI·Valeria GiovanettiGiovanni Molle
Aug 21, 2019·Foods·Mohammad AlothmanTom F O'Callaghan
Jan 19, 2021·Journal of Dairy Science·M F LunesuA Cannas