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Breeding Dairy Cattle for Female Fertility and Production in the Age of Genomics
Year:
2022
Source of publication :
Veterinary sciences
Authors :
Gershoni, Moran
;
.
Weller, Joel Ira
;
.
Volume :
Co-Authors:

Joel Ira Weller
Moran Gershoni
Ephraim Ezra

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Phenotypic and genetic changes for female fertility and production traits in the Israeli Holstein population over the last three decades were studied in order to determine if long term selection has resulted in reduced heritability and negative genetic correlations. Annual means for conception status, defined as the inverse of the number of inseminations to conception in percent, decreased from 55.6 for cows born in 1983 to 46.5 for cows born in 2018. Mean estimated breeding values increased by 1.8% for cow born in 1981 to cows born in 2018. Phenotypic records from 1988 to 2016 for the nine Israeli breeding index traits were divided into three time periods for multi-trait REML analysis by the individual animal model. For all traits, heritabilities increased or stayed the same for the later time periods. Heritability for conception status was 0.05. The first parity genetic correlation between conception status and protein yield was −0.38. Heritabilities decreased with the increase in parity for protein but remained the same for conception status. Realized genetic trends were greater than expected for cows born from 2008 through 2016 for somatic cell score, conception status and herd-life, and lower than expected for the production traits.

Note:
Related Files :
dairy cattle
Female fertility
genomics
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More details
DOI :
10.3390/vetsci9080434
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
62048
Last updated date:
19/09/2022 16:22
Creation date:
18/09/2022 17:54
Scientific Publication
Breeding Dairy Cattle for Female Fertility and Production in the Age of Genomics

Joel Ira Weller
Moran Gershoni
Ephraim Ezra

Breeding Dairy Cattle for Female Fertility and Production in the Age of Genomics

Phenotypic and genetic changes for female fertility and production traits in the Israeli Holstein population over the last three decades were studied in order to determine if long term selection has resulted in reduced heritability and negative genetic correlations. Annual means for conception status, defined as the inverse of the number of inseminations to conception in percent, decreased from 55.6 for cows born in 1983 to 46.5 for cows born in 2018. Mean estimated breeding values increased by 1.8% for cow born in 1981 to cows born in 2018. Phenotypic records from 1988 to 2016 for the nine Israeli breeding index traits were divided into three time periods for multi-trait REML analysis by the individual animal model. For all traits, heritabilities increased or stayed the same for the later time periods. Heritability for conception status was 0.05. The first parity genetic correlation between conception status and protein yield was −0.38. Heritabilities decreased with the increase in parity for protein but remained the same for conception status. Realized genetic trends were greater than expected for cows born from 2008 through 2016 for somatic cell score, conception status and herd-life, and lower than expected for the production traits.

Scientific Publication
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