| Abstrakt: |
The data comprising 274 first lactation records of Red Sindhi x Jersey crossbred cows spread over a period of 25 years from 1990 to 2014 maintained at CBF, Kalsi, Dehradun, Uttarakhand were used to estimate the genetic parameters of production traits. The average First lactation milk yield (kg), First lactation length (days), First calving interval (days) and First dry period (days) were 3045±590 kg, 326±53 days, 423±48 days and 106±15 days, respectively. The corresponding estimates of heritability were 0.32±0.10, 0.21±0.10, 0.17±0.12 and 0.10±0.10, respectively. The genetic correlation of First lactation milk yield FLMY with FLL, FCI and FDP was 0.27±0.05, 0.10±0.05 and 0.03±0.01, respectively. The phenotypic correlation of First lactation milk yield with FLL, FCI and FDP was 0.30±0.10, 0.18±0.09 and -0.10±0.05, respectively. The genetic correlation of FLL with FCI -0.35±0.11 and with FDP was -.30±0.16. The phenotypic correlation of FLL with FCI was -0.04±0.01 and with FDP 0.14±0.05. [ABSTRACT FROM AUTHOR] |
