Eficiência reprodutiva de um rebanho leiteiro pardo suiço criado na Estação Experimental de Cruzeta-Emparn, Município de Cruzeta - RN.

Abstract

This study aimed to evaluate the reproductive efficiency of cows bred brown Swiss created in the semiarid Northeast, specifically in Vocational Technology Center of Dairy Cattle RN - CVTBL - RN, located at the Experimental Station Cruzeta - EMPARN, municipality of Cruzeta. Data were collected from 50 individual chips husbandry of Brown Swiss cows, between the years 1984-2013. The data collected was recorded and cataloged with the purpose of statistical analysis, which was performed by determining the mean values and their standard deviation of age at first calving and calving interval. We tested the effects of the month, year and season on age at first calving, year, season and lactation on calving interval. Data were analyzed using the software InStat 3 and compared by Tukey test with a significance level of 1%. The statistical results obtained for age at first creates considering the time of year rainy and dry birth and birth year were P<0.01 e 0.01%, respectively, to be rather significant, however those regarding age at first calving, considering the month of birth as well as those related to calving interval given year, season and lactation, were not found statistically significant differences in these values.