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Reaction norm model to describe environmental sensitivity across first lactation in dairy cattle under tropical conditions

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Reaction norm model to describe environmental sensitivity across first lactation in dairy cattle under tropical conditions

Content Provider	Springer Nature Link
Author	Bignardi, Annaiza Braga El Faro, Lenira Pereira, Rodrigo Junqueira Ayres, Denise Rocha Machado, Paulo Fernando Albuquerque, Lucia Galvão de Santana, Mário Luiz
Copyright Year	2015
Abstract	Reaction norm models have been widely used to study genotype by environment interaction (G × E) in animal breeding. The objective of this study was to describe environmental sensitivity across first lactation in Brazilian Holstein cows using a reaction norm approach. A total of 50,168 individual monthly test day (TD) milk yields (10 test days) from 7476 complete first lactations of Holstein cattle were analyzed. The statistical models for all traits (10 TDs and for 305-day milk yield) included the fixed effects of contemporary group, age of cow (linear and quadratic effects), and days in milk (linear effect), except for 305-day milk yield. A hierarchical reaction norm model (HRNM) based on the unknown covariate was used. The present study showed the presence of G × E in milk yield across first lactation of Holstein cows. The variation in the heritability estimates implies differences in the response to selection depending on the environment where the animals of this population are evaluated. In the average environment, the heritabilities for all traits were rather similar, in range from 0.02 to 0.63. The scaling effect of G × E predominated throughout most of lactation. Particularly during the first 2 months of lactation, G × E caused reranking of breeding values. It is therefore important to include the environmental sensitivity of animals according to the phase of lactation in the genetic evaluations of Holstein cattle in tropical environments.
Starting Page	1405
Ending Page	1410
Page Count	6
File Format	PDF
ISSN	00494747
Journal	Tropical Animal Health and Production
Volume Number	47
Issue Number	7
e-ISSN	15737438
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-07-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Breeding Environment interaction Holstein Milk Selection Test day Zoology Veterinary Medicine
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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Reaction norm model to describe environmental sensitivity across first lactation in dairy cattle under tropical conditions