Campos, Ivan L; Chud, Tatiane C S; Junior, Gerson A Oliveira; Baes, Christine F; Cánovas, Ángela; Schenkel, Flavio S (2022). Estimation of Genetic Parameters of Heat Tolerance for Production Traits in Canadian Holsteins Cattle. Animals, 12(24) MDPI 10.3390/ani12243585
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Understanding how cows respond to heat stress has helped to provide effective herd management practices to tackle this environmental challenge. The possibility of selecting animals that are genetically more heat tolerant may provide additional means to maintain or even improve the productivity of the Canadian dairy industry, which is facing a shifting environment due to climate changes. The objective of this study was to estimate the genetic parameters for heat tolerance of milk, fat, and protein yields in Canadian Holstein cows. A total of 1.3 million test-day records from 195,448 first-parity cows were available. A repeatability test-day model fitting a reaction norm on the temperature-humidity index (THI) was used to estimate the genetic parameters. The estimated genetic correlations between additive genetic effect for production and for heat tolerance ranged from -0.13 to -0.21, indicating an antagonistic relationship between the level of production and heat tolerance. Heritability increased marginally as THI increased above its threshold for milk yield (0.20 to 0.23) and protein yield (0.14 to 0.16) and remained constant for fat yield (0.17). A Spearman rank correlation between the estimated breeding values under thermal comfort and under heat stress showed a potential genotype by environmental interaction. The existence of a genetic variability for heat tolerance allows for the selection of more heat tolerant cows.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics 05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) |
UniBE Contributor: |
Baes, Christine Francoise |
Subjects: |
500 Science > 590 Animals (Zoology) 600 Technology > 630 Agriculture |
ISSN: |
2076-2615 |
Publisher: |
MDPI |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
05 Jan 2023 11:35 |
Last Modified: |
05 Jan 2023 23:23 |
Publisher DOI: |
10.3390/ani12243585 |
PubMed ID: |
36552505 |
Uncontrolled Keywords: |
dairy cow heat stress production temperature-humidity index |
BORIS DOI: |
10.48350/176507 |
URI: |
https://boris.unibe.ch/id/eprint/176507 |
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