At each marker, the mean fertility, scored as a Z-score, was compared between genotypes using single marker regression.
A quantitative trait locus (QTL) affecting female fertility, scored as the inverse of the number of inseminations to conception, on Bos taurus chromosome 7 was detected by a daughter design analysis of the Israeli Holstein population (P < 0.0003).
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Schindler et al. demonstrated that the primary surgical intervention reduced the total r-AFS (revised American Fertility Society) score by 34%, whereas the combined therapy brought about a reduction of 66% [ 31].
In Israel, fertility is scored as the inversed number of inseminations to conception.
Male fertility was scored 14 day later, as the number of offspring eclosing from their pupal cases.
In this study, females were irradiated to induce transient sterility and the recovery of fertility was scored over time (see 'Materials and methods').
In the Phase I samples, the fertility (Z-score) of bulls was used as the quantitative trait for the association analysis of the remaining 8,207 markers.
The animals were transferred to a new vial at designated time points, and fertility was scored by the presence of larvae 10 days after the parents were removed.
We collected eggs for 7 days and scored them for fecundity (number of eggs), fertility (percent fertilized), and hatching success (percent hatched).
