Models for estimating feed intake in small ruminants

摘要: This review deals with the most relevant limits and developments of modeling intake sheep goats reared intensively extensively. Because small ruminants are normally fed ad libitum, voluntary feed is crucial in feeding tactics strategies aimed at optimal animal production. The effects genetic, neuroendocrine, hormonal, environmental factors on were discussed. Then, several mathematical models to estimate dry matter (DMI) examined, emphasis empirical for intensive farm systems or extensive areas under pasture rangeland conditions. A sensitivity analysis four prediction DMI housed lactating dairy meat breeds was also presented. work evidenced a large variability approaches used variables considered goats. Regarding estimation grazing browsing goats, accuracy estimates based developed so far very low when applied out boundaries studied system. Feeding experiments indoors outdoors remain fundamental better understanding interactions between feeds ruminants. However, there need biological theoretical frameworks which these should be carried out, that appropriate mechanistic equations predict could developed.