Urea-nitrogen recycling in sheep given low quality hill herbages.
D000821:Animal Feed / Q000592:standards; D000818:Animals; D005285:Fermentation; D007421:Intestine, Small / Q000502:physiology; D008297:Male; D009584:Nitrogen / Q000378:metabolism*; D012417:Rumen / Q000502:physiology; D012756:Sheep; D014508:Urea / Q000378:metabolism*
D014508:Urea; D009584:Nitrogen