Phenotypic correlation parameters, reproductive, production and longevity traits of Black White cattle
1995
Petrovic, M.M. (Institut za stocarstvo, Beograd - Zemun (Yugoslavia)) | Lazarevic, R. | Lazarevic, Lj. | Miscevic, B. | Aleksic, S.
The age of heifers at first fertilization did not greatly effect the service period duration, age at culling, productive life duration, the number of milking days, and milk and milk fat quantity during life-span. Correlation coefficients of service period duration and longevity traits showed poor correlative strength existing between the two of them. Mutual correlation was complete between the longevity traits and productive lifetime duration. Phenotypic correlation coefficient of 4 FCM in 305 lactation days and 4 FCM in lifetime production, expressed as production per milking day, per production day and per life-day, ranged from very weak, to weak and strong. The longevity traits and traits of cow life-span production were statistically considerably dependent upon age at first calving. The service period duration caused considerable influence on milking traits, longevity and life-span production.
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