Consumo residual de alimento (RFI) en la raza Angus.

Abstract

The objective of this research was to systematically analyze bibliographic sources, criteria by experts about the research and results that have been carried out in the study of Residual Feed Intake RFI in the Angus breed and its different racial crosses. For the analysis of the documents, some selection criteria were established. They were useful for the collection of information that was used during the research process and the following parameters were proposed: information with a high level of validity, that is to say that these are found in recognized and better academically valued formats such as magazines, scientific articles, theses and scientific documents where 90% of the information belongs to the last five years and 10% corresponds to previous years, in both, Spanish and English languages. Search criteria were used including the following descriptors: "Angus" and "RFI". Therefore, it is concluded that through the analysis and processing of the information of the scientific bases it is determined that the variables used to determine the residual feed consumption are: Adjusted initial weight (AIW), Adjusted final weight (AFW), Daily weight gain (GWG), daily consumption on dry basis (DCDB) and Feed Conversion (FC) which are obtained in a process of stabling the specimens in a minimum period of 120 days that lasted the behavioral test. It is recommended to continue studying the usefulness of RFI evaluated in confinement as an indicator of efficiency for grazing systems, predominant in our country. At the same time, although few antagonisms between RFI and traits of productive relevance have been found at international level, it is necessary to know the impact of selection by RFI under typical production conditions in the country on reproductive traits.