Abstract
The aim of this work was to analyze the influence of different zoo technical indexes in the composition and evolution of dairy cattle through the years. Two hundred forty herds were simulated by combinations among the zoo technical indexes ages at the first birth (24,30 and 36 months), birthrate (100%, 90%, 80%, 70% and 60%), culling (10%, 15%, 20% and 25%) and the female death rate from 0 to 1 year old, 1 to 2, 2 to 3 (3%, 6%, 9%, 12%, 2%, 4%, 6%, 8%, 1%, 2%, 3% and 4%, respectively). For the simulations of herd evolutions, the Computational System for Measurements and Evolution of Beef Cattle software was used. It was applied in the statistical analysis Kruskal-Wallis non-parametrical statistic, through NPAR1WAY procedure. Having observed significance in Kruskal-Wallis test, MULTTEST procedure was applied to verify the difference among the averages by the contrast. It was concluded the appropriate gaining of zoo technical indexes in the raise of dairy cattle influences the composition and evolution of herds, being the birthrate the most responsible for the herd evolution, followed by age at first birth, culling and death rates. KEY WORDS: Dairy cattle, herd planning, reproductive efficiency, simulation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
