Phosphorus in rangeland ruminant nutrition: A review

The role of phosphorus in ruminant nutrition is discussed with reference to factors influencing phosphorus turnover. Recent information leading to a re-estimation of P requirements is presented.Particular reference is made to recent information on the hormonal control of P homeostasis and its relationship to the CaP interaction. Emphasis is placed on the interaction of P with other nutrients, particularly Ca, protein and energy, and it is stressed that phosphorus cannot be considered as an isolated nutrient and panacea for ill-thrift and infertility of rangeland cattle and sheep.