scholarly journals Single‐step genomic evaluation of Russian dairy cattle using internal and external information

2021 ◽  
Author(s):  
Andrei A. Kudinov ◽  
Esa A. Mäntysaari ◽  
Timo J. Pitkänen ◽  
Ekaterina I. Saksa ◽  
Gert P. Aamand ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Single Step ◽  
External Information ◽  
Genomic Evaluation

scholarly journals Application of single-step genomic evaluation using multiple-trait random regression test-day models in dairy cattle

2019 ◽  
Vol 102 (3) ◽  
pp. 2365-2377 ◽  
Author(s):  
H.R. Oliveira ◽  
D.A.L. Lourenco ◽  
Y. Masuda ◽  
I. Misztal ◽  
S. Tsuruta ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Single Step ◽  
Random Regression ◽  
Genomic Evaluation ◽  
Multiple Trait ◽  
Regression Test

Single step genomic evaluation for female fertility in Nordic Red dairy cattle

2018 ◽  
Vol 135 (5) ◽  
pp. 337-348 ◽  
Author(s):  
Kaarina Matilainen ◽  
Ismo Strandén ◽  
Gert Pedersen Aamand ◽  
Esa A. Mäntysaari
Keyword(s):  
Dairy Cattle ◽  
Single Step ◽  
Female Fertility ◽  
Genomic Evaluation

Reducing bias in the dairy cattle single-step genomic evaluation by ignoring bulls without progeny

2018 ◽  
Vol 135 (2) ◽  
pp. 107-115 ◽  
Author(s):  
M. Koivula ◽  
I. Strandén ◽  
G.P. Aamand ◽  
E.A. Mäntysaari
Keyword(s):  
Dairy Cattle ◽  
Single Step ◽  
Genomic Evaluation

scholarly journals Genotype-by-environment interaction in Holstein heifer fertility traits using single-step genomic reaction norm models

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Rui Shi ◽  
Luiz Fernando Brito ◽  
Aoxing Liu ◽  
Hanpeng Luo ◽  
Ziwei Chen ◽  
...  
Keyword(s):  
Heat Stress ◽  
Dairy Cattle ◽  
Candidate Genes ◽  
Heat Tolerance ◽  
Reaction Norm ◽  
Single Step ◽  
Conception Rate ◽  
Critical Periods ◽  
Genotype By Environment ◽  
Fertility Traits

Abstract Background The effect of heat stress on livestock production is a worldwide issue. Animal performance is influenced by exposure to harsh environmental conditions potentially causing genotype-by-environment interactions (G × E), especially in highproducing animals. In this context, the main objectives of this study were to (1) detect the time periods in which heifer fertility traits are more sensitive to the exposure to high environmental temperature and/or humidity, (2) investigate G × E due to heat stress in heifer fertility traits, and, (3) identify genomic regions associated with heifer fertility and heat tolerance in Holstein cattle. Results Phenotypic records for three heifer fertility traits (i.e., age at first calving, interval from first to last service, and conception rate at the first service) were collected, from 2005 to 2018, for 56,998 Holstein heifers raised in 15 herds in the Beijing area (China). By integrating environmental data, including hourly air temperature and relative humidity, the critical periods in which the heifers are more sensitive to heat stress were located in more than 30 days before the first service for age at first calving and interval from first to last service, or 10 days before and less than 60 days after the first service for conception rate. Using reaction norm models, significant G × E was detected for all three traits regarding both environmental gradients, proportion of days exceeding heat threshold, and minimum temperature-humidity index. Through single-step genome-wide association studies, PLAG1, AMHR2, SP1, KRT8, KRT18, MLH1, and EOMES were suggested as candidate genes for heifer fertility. The genes HCRTR1, AGRP, PC, and GUCY1B1 are strong candidates for association with heat tolerance. Conclusions The critical periods in which the reproductive performance of heifers is more sensitive to heat stress are trait-dependent. Thus, detailed analysis should be conducted to determine this particular period for other fertility traits. The considerable magnitude of G × E and sire re-ranking indicates the necessity to consider G × E in dairy cattle breeding schemes. This will enable selection of more heat-tolerant animals with high reproductive efficiency under harsh climatic conditions. Lastly, the candidate genes identified to be linked with response to heat stress provide a better understanding of the underlying biological mechanisms of heat tolerance in dairy cattle.

scholarly journals Sparse single-step method for genomic evaluation in pigs

2016 ◽  
Vol 48 (1) ◽  
Author(s):  
Tage Ostersen ◽  
Ole F. Christensen ◽  
Per Madsen ◽  
Mark Henryon
Keyword(s):  
Single Step ◽  
Genomic Evaluation ◽  
Step Method
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