Correlation and regression analysis of KRT35 and TCHHL1 functional genes for cashmere fineness in Liaoning cashmere goats

Liaoning cashmere goat (LCG) is the world's highest cashmere producing white cashmere goat. It has the characteristics of long cashmere fiber, high net cashmere rate, moderate cashmere fineness, white cashmere, strong size, strong adaptability, stable genetic performance, and good effect in improving middle and low production cashmere goat. It is known as "National treasure of China". With LCG as the paternal parent, five new local breeds have been cultivated, which has made outstanding contributions to the improvement and breeding of Chinese cashmere goat breeds. LCG cashmere has moderate fineness (the average fineness of cashmere of LCG population is about 16 µm).However, as a slightly coarse textile raw material, we hope to identify the key genes regulating cashmere fineness through PCR-seq and MLR, in order to reduce cashmere fineness.We collected and extracted DNA from the blood of Liaoning cashmere goats, designed primers, PCR amplification, and Statistical analysis. It was found that the the AA genotype of the G3667A locus of the KRT35 gene, CT genotype of the T615C locus of the TCHHL1 gene in bucks and the CC genotype of does, as well as CT genotype of the T615C locus of the TCHHL1 gene in bucks and the CC genotype of does are dominant genotypes in cashmere fineness. The dominant haplotype combination with multiple factors and effects of cashmere fineness has been determined to be CTGG in bucks and TTGG in does. There was a significant linear regression relationship between the fineness of cashmere in LCG and the cashmere rate and cashmere quantity. There is a significant linear regression relationship between the fineness of LCG and the cashmere rate and cashmere quantity. CF = 0.001SQ-0.71CY + 20.784 (R² = 0.818) in buck and CF = 0.001SQ-0.767CY + 22.009 (R² = 0.863) in doe. Conclusion: The AA genotype of KRT35 gene, CT genotype of TCHHL1 gene in bucks and CC genotype of does can be used as molecular markers to assist in the selection of cashmere fineness.