ArticleTropical animal health and production2026
Influence of genomic retained heterosis on lactation persistence and tropical resilience: leveraging joint-model GWAS to quantify non-additive variance in India's Karan Fries population.
Article in Tropical animal health and production, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The Karan Fries (KF), a newly developed dairy cattle (Holstein Friesian × Tharparkar), after nine generations of inter se mating (mating among crossbreds) by maintaining a stable, composite breed structure, is expected to preserve some heterosis or hybrid vigour through the retention of heterozygosity and selective pressure for performance traits. Although a decline in productivity is generally seen from F1 to later inter se generations, the rate of loss of heterosis slows down, allowing the population to reach a new equilibrium. This seems to be an interesting proposition. Therefore, to assess the retained heterosis and to evaluate the current status of the KF population, the present study was conducted, which included a sizeable phenotyped and genotyped animals (n = 355). The analysis identified a stabilized genomic architecture with a mean exotic inheritance of 64.34 ± 0.74% (predominantly Holstein Friesian) and an indigenous contribution of 35.66 ± 0.95% (primarily Tharparkar). Genomic indicators of heterosis revealed a mean Genomic Retained Heterosis (RH
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