Evolução e premissas dos protocolos hormonais de inseminação artificial em tempo fixo na pecuária / Evolution and premises of hormonal protocols of fixed time artificial insemination in livestock
Brazil has historically become one of the main producers of dairy and beefcattle. However, for the country to continue with high efficiency in production, it is necessary to perform the replacement productive animals. Such factor is provided by animalreproduction, through new biotechnologies created, one of which is Artificial Insemination in Fixed Time (IATF), which assigns a certain hormonal protocol and it is possible to know the specific day for the insemination of the female without the need of oestrus observation. The objective of the current review is to synthesize the evolution of hormonal protocols of IATF and present the current strategies for increasing herd fertility.(AU)