Mineral and vitamin nutrition of dairy cattle.

摘要: Abstract During the last quarter century progress has been great in methodology for mineral and nutrition research, especially as it relates to analytical instrumentation use of radioactive isotopes. Vastly greater numbers both research farmer samples are analyzed now elements resulting much better understanding variability content feeds. Important made dairy cattle metabolism certain including zinc, copper, iodine, selenium, manganese, iron, magnesium, potassium, chlorine, calcium, phosphorus, sulfur. Substantial interest work have developed or renewed toxic potentially cadmium, mercury, nickel, fluorine. Also, on adverse effects excessive amounts essential elements. Because practical importance grass tetany, magnesium an area considerable work. Some new expanded concepts contributed materially Among these is a role homeostasis minerals. This useful interpreting old data. For instance, knowledge routes homeostatic control crucial understand related calcium requirement cattle. The interrelationship between vitamins among prominent accomplishments this 25 yr. Especially noteworthy that selenium vitamin E D metabolism. Progress few aspects which functional forms notable example.