Genotype x environment interaction for milk production of daughters of Australian dairy sires from test-day records

Hayes, B. J., Carrick, M., Bowman, P. and Goddard, M. E. (2003) Genotype x environment interaction for milk production of daughters of Australian dairy sires from test-day records. Journal of Dairy Science, 86 11: 3736-3744. doi:10.3168/jds.S0022-0302(03)73980-0


Author Hayes, B. J.
Carrick, M.
Bowman, P.
Goddard, M. E.
Title Genotype x environment interaction for milk production of daughters of Australian dairy sires from test-day records
Journal name Journal of Dairy Science   Check publisher's open access policy
ISSN 0022-0302
1525-3198
Publication date 2003-11
Sub-type Article (original research)
DOI 10.3168/jds.S0022-0302(03)73980-0
Open Access Status Not yet assessed
Volume 86
Issue 11
Start page 3736
End page 3744
Total pages 9
Place of publication New York, NY, United States
Publisher Elsevier
Language eng
Abstract In Australia, dairy farming is carried out in environments that vary in many ways, including level of feeding and climate variables such as temperature and humidity. The aim of this study was to assess the magnitude of genotype × environment interactions (G×E) on milk production traits (milk yield, protein yield, and fat yield) for a range of environmental descriptors. The environment on individual test days was described by herd size (HS), average herd protein yield (AHTDP), herd test-day coefficient of variation for protein yield (HTDCV), and temperature humidity index (THI). A sire random regression model was used to model the response of a sire’s daughters to variation in the environment and to calculate the genetic correlation between the same traits measured in two widely different environments. Using test-day records, rather than average lactation yields, allowed exploitation of withincow variation as well as between-cow variation at different levels of AHTDP, and led to more accurate estimates of sire breeding values for “response to environment.” The greatest G×E observed was due to variation in AHTDP, with a genetic correlation of 0.78 between protein yield when AHTDP = 0.54 kg and protein yield when AHTDP = 1.1 kg (the 5th and 95th percentile of the distribution of AHTDP). The G×E was also observed for THI, with a genetic correlation of 0.90 between protein yield at the 5th and 95th percentile of THI. The use of response to environment estimated breeding values to improve the accuracy of international sire evaluations is discussed.
Keyword Genotype x environment interaction
Herd test day
Random regression
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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