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Small ruminants farming plays an important role in the livelihood of a large part of the population. Herein we aimed to analyze the effects of single nucleotide polymorphisms in  PRKAA2  gene on the growth-related traits of Hu sheep and Dorper sheep. The body weight and body type of 1254 sheep were measured at 80, 100, 120, 140, 160 and 180d, and 37620 phenotypic data were collected. RT-qPCR analysis was performed to test  PRKAA2  gene expressed in different tissues of sheep, with the highest expression level in spleen, followed by kidney. In the present study, the  PRKAA2  gene sequencing revealed one polymorphism located on Chr1 (Oar_rambouillet_v1.0), termed as chr1:32832382 G &gt; A, and were significantly associated with growth traits of sheep ( p &lt;  0.05). The body weight, body length, chest circumference, and cannon circumference of individuals with AA genotype were significantly higher than those with the GG and GA genotypes ( p  &lt; 0.05). Our findings reveal that  PRKAA2  gene could be used as a marker-assisted selection to improve the growth-related traits of sheep.

Polymorphism of sheep PRKAA2 gene and its association with growth traits