ArticleAnimals : an open access journal from MDPI2026
Effects of the Temperature-Humidity Index on Milk Production Traits and Gene-Environment Interactions in Chinese Holstein Cows.
Article in Animals : an open access journal from MDPI, 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
Heat stress limits dairy production. The temperature-humidity index (THI), combining temperature and relative humidity, is widely used to assess heat stress. However, in Chinese Holstein cattle, the phenotypic responses of milk traits and genotype-environment interaction mechanisms under different THI conditions are understudied. Based on 63,334 records from 7240 cows (milk yield, fat percentage, protein percentage), matched with meteorological data and 113,297 SNPs, we employed a random-effects GWAS to examine SNP effects across a continuous THI gradient, comparing results with conventional, temperature-, and humidity-interaction GWAS. As THI increased, all traits declined with distinct patterns. Random regression GWAS identified 149 significant SNP × THI interactions (5 for MY, 86 for FP, 58 for PP), distributed across BTA5, BTA6, BTA14, and BTA20. Candidate gene annotation identified 52 candidate genes near significant SNPs, of which 50 core candidate genes were supported in both temperature and humidity GWAS. The most robustly supported core candidate genes include
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