Fig. 2: Genetic diversity and differentiation of indigenous chicken breeds during different conservation programmes.

a Patterns of linkage disequilibrium (LD) decay across the genome for TC during different conservation programmes (Con – cryopreserved samples, as a control, NCF; In – in situ conservation, NCF; and Ex – ex situ in vivo conservation, NCGR). LD decay in WC and BC are shown in Supplementary Fig. 4. X axis: physical distance between two SNPs marked in kb; Y axis: R2, pearson’s correlation coefficient, used to measure LD. b Heterozygosity across populations. Estimated as the ratio of homozygous SNPs (HOM) to heterozygous SNPs (HET) per individual. The centre line of boxplots represents median value of each population. c Nucleotide diversity (π) across populations. The centre line of boxplots represents median value of each population. d Genetic differentiation (FST) across populations in each breed of different conservation programmes. The value on each dotted line indicates FST between the two populations, and the value in each cycle represents π in this populations.