THE RELATIONSHIPS BETWEEN MILK PRODUCTION AND REPRODUCTION IN A HIGH-PERFORMANCE HOLSTEIN-FRIESIAN HERD PUBLISHEDAdrienn Zsanett KRAJCSOVICS, A. RIBÁCS Hungarian University of Agriculture and Life Sciences Ribacs.Attila@uni-mate.hu
The authors studied the relationships between the milk production and reproduction in a high performance Holstein-Friesian herd in Hungary (Békés County). The corrected lactation performance (calculated for 305 days) was above 10 thousand kg in the first lactation and later above 11 thousand kg. From the 2nd lactation, the FCM performance (calculated for 305 days and 4% fat) also exceeded 10 thousand kg. The effect of milk production (total lactation, corrected for 305 days, FCM) as well as the production of milk components (fat, protein) on the length of the service period and the fertility index was examined. The studied parameters influenced the length of the service period mainly in young (the first and second lactation) and older (the fourth and fifth lactation) cows, while there was less correlation in the third lactation cows. The strongest correlation was found with the length of lactation (r = 0.82-0.89) and the total lactation performance (r = 0.57-0.80). There was also a significant correlation with the ratio (%) of the performance in the first 100 days / total lactation (r = (-0.59)-(-0.78)). In young age, the milk protein production (r = 0.42-0.47), while in older cows the milk fat production (r = 0.47-0.59) had a stronger effect on the length of the service period. The fertility index was also most related to the length of lactation (r = 0.63-0.76) and the total lactation performance (r = 0.40-0.70).
Holstein-Friesian, milk production, reproduction