Abstract. The Fbxl5 gene is a member of the F-BOX family
and plays an important role in maintaining iron homeostasis in cells. In
order to reveal the genetic effects of Fbxl5 gene polymorphisms on
body weight (BW) traits and reproductive performance in chickens,
Fbxl5 gene polymorphisms were detected in 363 Jinghai Yellow
chickens by PCR-single-strand conformation polymorphism (SSCP) and DNA
sequencing methods using three primers. With primer 1, three genotypes (BB,
bb, Bb) were detected in the Jinghai Yellow chicken population and two
mutations (g. 14257 T > C and g. 14262 T > C)
were revealed by gene sequencing. With primer 2, two genotypes (EE, Ee) were
detected in the same population and one mutation (g.
19018 G > A), and for primer 3, three genotypes (FF, ff, Ff)
and one mutation (g. 19018 G > A) were detected. Four single
nucleotide polymorphisms (SNPs) were used to estimate the frequency
distributions of the eight haplotypes with PHASE 2.1 software. CTCG was the
major haplotype with a frequency of 37.93 %, while the least frequent was
TCTA with a frequency of 2.98 %. The BW of haplotype combination H1H8 was
higher than that of the other haplotypes and was a dominant combination. In
terms of reproductive performance, the age at the first egg of the haplotype
combination H9H1 was later than in the other haplotypes, but the mean egg
weight at 300 days was relatively optimal. The H1H2 haplotype produced the
highest mean egg weight in 300 days, although the total number of eggs in
300 days was smaller in the H2H4 haplotype with the highest at first egg.
Therefore, we can consider using the haplotype combination H1H2 for
selection. The findings of this study expand the theoretical basis of the use
of the Fbxl5 gene in the molecular breeding of poultry.