engleski

Partitioning of genetic trends by flock and gender in Istrian sheep breed

Istrian sheep is Croatian native breed traditionally selected for milk yield, but the success of past selection efforts has never been studied. Genetic trends play an important role in this regard, and their decomposition is effective in identifying the main contributors to trait related genetic change. The objective of this study was to estimate recent genetic trends (2014-2018) obtained under framework of single step genomic BLUP (test-day animal model) and to partition them by gender and flock. The overall genetic trend was positive, but negligible and inconsistent. Males contributed slightly more to the overall genetic trend than females, while the partitioning by flock was inconclusive. The results implicate absence of systematic selection in the recent period and impose a need to conduct selection based on the estimated breeding values. The ongoing transition to single step genomic BLUP in this population will provide sufficiently accurate breeding values to provide faster and consistent selection gain.

partitioning, Istrian sheep, selection, flock, sex

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