DAIRY AND REPRODUCTIVE-PERFORMANCE OF IMPORTED HOLSTEIN CATTLE

Production traits (import to first calving period, first and second la ctation milk performance, protein and fat yield) and fertility traits (calving interval, calving to first insemination interval, service per iod, first service conception rate, conception rate and services per c onception) were analysed in imported Holstein cattle. 544 first calver cows were used for the analyses. Data were analysed by SAS/STAT(R) pr ogram using mixed model least squares and maximum likelihood method. A model of analysis contained effects of farm, first calving season and import to first calling period. Import to first calving period had si gnificant effect on first lactation length, hundred days of first lact ation milk performance and protein yield. Long (P less than or equal t o 0.01) import to first calving period was observed in farm II and III and short (P less than or equal to 0.01) import to first calving peri od was observed in farm I. Farm II had high (P less than or equal to 0 .01) protein yield.at hundred days of first lactation and during secon d lactation. Low (P less than or equal to 0.01) first lactation protei n yield was recorded in farm I. Farm II had high (P less than or equal to 0.01); second lactation milk performance. Significantly best ferti lity traits were determined in farm III. Except service period first c alving season had no significant effect on analysed fertility traits. Import to first calving period effect was insignificant on analysed re productive traits. Finally, before importation of highly improved bree d the preparation of farms to provide proper nutrition and management is the most important paragenetic factor.