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Genetic analysis of fertility traits in Israeli Holsteins by linear and threshold models.
Year:
1992
Source of publication :
Journal of Dairy Science
Authors :
Ron, Micha
;
.
Weller, Joel Ira
;
.
Volume :
75
Co-Authors:
Weller, J.I., Institute of Animal Sciences, Volcani Center, Bet Dagan, Israel.
Ron, M., Institute of Animal Sciences, Volcani Center, Bet Dagan, Israel.
Facilitators :
From page:
2541
To page:
2548
(
Total pages:
8
)
Abstract:
Conception rates of Israeli Holstein cows and heifers were analyzed separately by linear and threshold models. Fixed effects for both data files were insemination number, AI institute, geographical region, and calendar month. Analysis of cows also included the fixed effects of parity, calving status, and DIM at insemination. Random effects included in the models were herd-year-season, insemination technician, sire of cow, and service sire. Fixed effect solutions for heifers and cows were not similar. For cows, insemination month had the greatest effect on conception rate. Heritability of conception rate ranged from 2 to 3.5% for heifers and from 1 to 2% for cows. Correlations between corresponding threshold and linear model random effect solutions were all greater than or equal to .99. Correlations between heifer and cow analyses for sire and service sire solutions were less than .4. Analysis with an incorrect herd-year-season variance component affected only the technician solutions.
Note:
Related Files :
Animal
article
cattle
Female
fertility
Genetics
Israel
Models, Biological
pregnancy
season
Seasons
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29037
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:43
Scientific Publication
Genetic analysis of fertility traits in Israeli Holsteins by linear and threshold models.
75
Weller, J.I., Institute of Animal Sciences, Volcani Center, Bet Dagan, Israel.
Ron, M., Institute of Animal Sciences, Volcani Center, Bet Dagan, Israel.
Genetic analysis of fertility traits in Israeli Holsteins by linear and threshold models.
Conception rates of Israeli Holstein cows and heifers were analyzed separately by linear and threshold models. Fixed effects for both data files were insemination number, AI institute, geographical region, and calendar month. Analysis of cows also included the fixed effects of parity, calving status, and DIM at insemination. Random effects included in the models were herd-year-season, insemination technician, sire of cow, and service sire. Fixed effect solutions for heifers and cows were not similar. For cows, insemination month had the greatest effect on conception rate. Heritability of conception rate ranged from 2 to 3.5% for heifers and from 1 to 2% for cows. Correlations between corresponding threshold and linear model random effect solutions were all greater than or equal to .99. Correlations between heifer and cow analyses for sire and service sire solutions were less than .4. Analysis with an incorrect herd-year-season variance component affected only the technician solutions.
Scientific Publication
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