The GnRHR and NPY genes were genotyped after digestion of the PCR products with
the restriction enzymes Bpu1102I and DarI, respectively. The restriction fragment lengths for
the A and a alleles of the GnRHR gene were 255/145 and 400 bp, and for the B and b alleles
of the NPY gene 240 and 79/161 bp, respectively. Genotype and allele frequencies for both
genes investigated are shown in Table 2.