Figure 1.
Figure 1.

The total number of small (1 to 5 mm) antral follicles counted on d 5.8 ± 0.2 of the estrous cycle in the paired ovaries of a cow at slaughter. Genotype of ionotropic glutamate receptor AMPA1 (GRIA1) did not influence follicle number (P = 0.43); however, there was a significant effect of fertility group (P = 0.003) because repeat breeder cows had fewer small follicles in their ovaries than control cows when corrected for day of the estrous cycle. Number of cows in each genotype is as follows: GG: repeat breeder = 9, control = 19; GA: repeat breeder = 27, control = 26; AA: repeat breeder = 20, control = 18.

 


Figure 2.
Figure 2.

Influence of GnRH receptor (GnRHR) genotype on age at first calving in days. Cows that were homozygous for the C allele had a greater average age at first calving than heterozygotes or cows that were homozygous for the T allele (P = 0.01). a,bBars with different superscripts are different. Number of cows in each genotype is as follows: CC = 16, CT = 67, TT = 39.

 


Figure 3.
Figure 3.

Relative abundances of anti-Müllerian hormone (AMH) and pentraxin 3 (PTX3) gene expression in the pooled granulosa cells from repeat breeder (n = 32) and control (n = 25) cows. Fertility group did not influence the relative abundances of AMH (P = 0.12) or PTX3 (P = 0.44) mRNA produced by the granulosa cells.