The evaluation of fat to protein ratio in milk as an indicator of calving to conception interval in dairy cows using various biostatistical methods

The effect of fat to protein ratio (FPR) in milk for the prediction of calving to conception interval (CC) in dairy cows is evaluated using different biostatistics' method. Results of this study demonstrate that there is a significant relationship between the FPR in milk samples and the fertility data of these cows. We showed that various biostatistical methods should be used for the evaluation of FPR, because each method provides a unique view on the parameter's characteristics. The results of the study contribute to a complementary tool in the evaluation of metabolic stress in early postpartum period in dairy cows. Moreover, the results will help veterinary practitioners and farmers to analyse fertility problems in dairy herds and to improve their reproductive and productive efficiency.