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The objective of this study was to determine the relationships between milk yield andcalving interval in first lactation and breeding efficiency, herd life and length ofproductive life of 1 293 Holstein cows maintained at Ceylanpinar State Farm in SoutheastAnatolia from 1990 to 2002.  The least-squares means of first lactation milk yield, lactation length and calvinginterval were 5 620.1 ± 76.6 kg, 315.5 ± 2.0 and 386.9 ± 2.6 days. The values for breedingefficiency, herd life and length of productive life were 94.9 %, 2 095.9 ± 34.7 and1 257.2 ± 34.4 days. The year of first lactation had significant effect (<i>P</i><0.05) on all traitsexcept for calving interval and lactation length, and breeding efficiency was only affectedby age at first insemination and age at first calving (<i>P</i><0.05).  Heritabilities were 0.27 ± 0.08 for milk yield, 0.02 ± 0.05 for lactation length, 0.06 ± 0.05for calving interval, 0.05 ± 0.05 for breeding efficiency, 0.30 ± 0.08 for herd life and0.29 ± 0.08 for length of productive life. Genetic and phenotypic correlations betweendifferent traits ranged from −0.49 to 0.99 and −0.37 to 0.99 respectively

Relationships between production and fertility traits in first lactation and life time performances of Holstein cows under subtropical condition