Characterization of dystocia in a herd of Holstein dairy cows in Brazil

Abstract The objective of this study was to characterize calvings with low and high difficulty based on the productive reproductive performance dairy cows. Calvings were grouped in no calving assistance, assistance. original data set comprised 1,902 records obtained from a large farm Southeast Brazil. Factor analysis applied using SAS® Studio 3.8 statistical program through factor procedure, considering Multivariate Analysis category. Milk fat (0.92–0.79) total solids (0.91–0.80) strongly correlated 1. Calving interval (0.87– 0.68) number AI (artificial inseminations) per conception (0.87–0.71) showed correlations 2. yield (0.84–0.76) accumulated milk (0.84–0.77) 3. Based results, we conclude that three scenarios characterized by well-defined independent factors. Cows which required assistance at lower variance explained model for contents, interval, AIs conception.