Phenotypic relationships between docility and reproduction in Angus heifers 1

Phenotypic relationships between docility and reproduction in Angus heifers 1

The objective of this study was to elucidate the phenotypic relationships between docility and first-service AI conception rate in heifers. Data (n = 337) collected from 3 cooperator herds in Kansas at the start of synchronization protocol included exit velocity (EV), chute score (CS), fecal cortiso...

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Veröffentlicht in:Journal of animal science 2016-02, Vol.94 (2), p.483-489
Hauptverfasser: White, K L, Bormann, J M, Olson, K C, Jaeger, J R, Johnson, S, Downey, B, Grieger, D M, Waggoner, J W, Moser, D W, Weaber, R L
Format: Artikel
Sprache:eng
Schlagworte:
Age
Animal reproduction
Animal sciences
Blood
Cattle
Correlation analysis
Correlation coefficients
Cortisol
Data collection
Data processing
Dependent variables
Fertility
Genetics
Genotype & phenotype
Pregnancy
Regression analysis
Statistical analysis
Studies
Synchronism
Synchronization
Velocity
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Zusammenfassung:The objective of this study was to elucidate the phenotypic relationships between docility and first-service AI conception rate in heifers. Data (n = 337) collected from 3 cooperator herds in Kansas at the start of synchronization protocol included exit velocity (EV), chute score (CS), fecal cortisol (FC), and blood serum cortisol (BC). Data were analyzed using logistic regression with 30-d pregnancy rate as the dependent variable. The model included the fixed effect of contemporary group and the covariates FC, BC, EV, CS, BW, and age. Correlation coefficients were calculated between all continuous traits. Pregnancy rate ranged from 34% to 60% between herds. Blood cortisol positively correlated with EV (r = 0.22, P
ISSN:0021-8812
1525-3163
DOI:10.2527/jas2015-9327