Abstract:

Although there are different units used in the evaluation of feed by animals, the studies that used the residual feed intake is noted to be quite limited. Residual feed intake is defined as the difference between an animal's actual feed intake and expected feed intake depending on its size and growth. This study aims to present the current situation regarding residual feed intake in animal nutrition and to provide information about the usability of residual feed intake. In this context, the subject is discussed in detail by focusing on the physiological basis of residual feed intake, some units in defining feed efficiency, residual feed intake calculation models, residual feed intake practices in some livestock, and the economic and environmental benefits of residual feed intake selection. In the limited study conducted on residual feed intake, it is reported that breeding studies can be carried out by using residual feed intake (animal selection), that the animals with the least dry matter intake can be determined among the animals with the same yield, and that positive effects on the growth rate can be achieved by using the residual feed intake unit. In addition, it is thought that residual feed intake can be preferred in ruminants in terms of providing very important contributions to reducing greenhouse gas emissions, and considering the advantages and successful results in animal nutrition, the use of residual feed intake will become widespread worldwide.

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