Bovine reproductive characteristics of the Nelore breed in the middle northern Brazil

Abstract

The Brazilian Court consists of cattle in its majority by animals of zebuínas breeds, with high level of adaptation to the tropical environment that favors its exploitation is primarily pasture production system, making Brazil a major competitor in the beef export market, nevertheless, this sector still find yourself submerged in low reproductive rates, which forces the industry to undergo great transformations in order to seek ways to increase productivity and economic efficiency in the industry. Reproductive efficiency of livestock is one of the determining factors for total system efficiency of meat production, therefore, must be considered as one of the main selection criteria within the animal genetic improvement programs for high rates of production, associated with the high efficiency of reproductive, herds which targets to bring technicians and designers to achieve greater productivity and achieve greater cost-effectiveness in the activity. Many scientific studies have also been developed for estimating genetic parameters characteristics of age at first calving (IPP) that has the purpose of expressing sexual precocity in female, influencing directly on the productive efficiency and the range of parts (PID) which is one of the most important features for assessing reproductive efficiency in cutting herds, being constituted by gestation period Open days, or dry period and period of lactation. The interest of this study is to show for students and researchers the importance of studying the reproductive features emphasizing the age the first lambing and calving interval.