The major nutrients commonly analyzed in feed samples are described below. Requirements for CP must be met in a ration designed to optimize production. Energy Energy is a major nutrient required for maintenance, growth, production and reproduction. Energy values for other feedstuffs are usually obtained from reference books. P. Hay and haylage are good sources of Ca but relatively poor in P. Grains are rich in P but contain little Ca.
Many roughages grown on Mg deficient soil are low in Mg.
In general, hay and haylage provide an abundant source of Mg and K, whereas grains contain lower levels. Mg and K should be analyzed in feeds fed to ruminant animals. The levels of these three minerals vary considerably in feed. Copper should be routinely analyzed in feeds offered to sheep. Consult a veterinarian for advice if a trace mineral deficiency or excess is suspected.