The Nutrient Requirements of Ruminant Livestock: Technical Review, Tema 2

absorption acid adequate allowances amount animals apparent assumed Blaxter body breeds calcium calculated calf calves castrates cattle changes coefficient concentration containing copper cows daily deficiency degradability diet dietary digested dry matter edition effects efficiency endogenous equation estimates et al evidence ewes experiments factors faecal feed g/day g/kg gain given grass growing growth higher increase intake iodine iron lactation lambs less live weight liver loss lower magnesium maintenance meal mean measured metabolizable energy mg/kg microbial milk milk yield needs normal observations obtained phosphorus pregnancy present production protein range ration RDP RDP RDP UDP RDP receiving reduced relationship reported requirements retention retinol rickets rumen ruminants selenium sheep showed silage similar sodium sources studies suggested supplementation supply Table tissue trials utilization values vitamin weeks weight gain weight kg zinc