Analysis of the Genetic Pattern of Tail Length Variation in Sheep

doi:10.7668/hbnxb.20194862

Abstract

Abstract:

In order to grasp the genetic characteristics of sheep tail length trait,evaluate the genetic effect of c.C334A genotype of TBXT gene,a candidate marker related to sheep tail length variation,and provide a reference for breeding sheep short tail trait.The long-tailed Texel sheep,tailless Kazakh sheep,and hybrid F₁ and F₂ progeny populations were selected as the research objects.The genetic pattern of the number of tail vertebrae was analyzed,and the correlation between the number of tail vertebrae and tail length was analyzed.The genotype effect of TBXT c.C334A on tail length variation was evaluated in the hybrid population of Texel sheep and Kazakh sheep using SPSS 26.0 regression analysis.The results showed that the average number of caudal vertebrae,skewness and peakedness of Texel sheep were 17.87±1.30,1.18±0.58 and 1.37±1.12,respectively.The average number of caudal vertebrae,skewness and peakedness of Kazak sheep were 3.52±1.03,0.54±0.50 and 0.34±0.97,respectively.The average number of caudal vertebrae,skewness and peakedness of the F₁ population were 12.61±1.82,-0.40±0.54 and 1.52±1.08,respectively.The average number of caudal vertebrae,skewness and peakedness of the F₂ population were 11.67±2.63,-0.70±0.23 and-0.12±0.46,respectively.It showed that the inheritance of the number of sheep tail vertebrae in parents and offspring conformed to the genetic pattern of quantitative traits.The coefficient of determination R² of the number of tail vertebrae to the tail length of sheep was 0.726,indicating that the change of the number of tail vertebrae was the main influencing factor of the tail length variation.The additive effect,dominant effect and substitution effect of TBXT c.C334A on tail length variation were 2.62,0.14 and 2.57,respectively.This locus explained 43.96% of the phenotypic variation of tail length,suggesting that TBXT c.C334A is a genetic marker that affects the tail length by affecting the number of tail vertebrae.

Key words: Sheep, Tail length, Number of caudal vertebrae, TBXT, Genetic pattern

LI Jingping, LI Zhonghui, LIU Xuan, MA Haiye, YUE Chengguang, WANG Jiajun, ZHANG Qianwen, LI Wenrong. Analysis of the Genetic Pattern of Tail Length Variation in Sheep[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(S1): 312-319. doi: 10.7668/hbnxb.20194862.

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References 36

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性别 Sex	数量 Number	尾长/cm Tail length
公羔Male lambs	250	10.70±2.50a
母羔Mother lambs	284	10.23±2.75a

性别 Sex	数量 Number	尾长/cm Tail length
公羔Male lambs	250	10.70±2.50a
母羔Mother lambs	284	10.23±2.75a

杂交组合 Hybridized combination	数量 Number	尾长/cm Tail length	等位基因频率 Allele frequency		HWE (P value)
杂交组合 Hybridized combination	数量 Number	尾长/cm Tail length	C	A	HWE (P value)
级进F₂ Grading F₂	303	11.06±2.21a	0.73	0.27	0.002
级进F₂×F₁ Grading F₂×F₁	134	10.66±2.64a	0.65	0.35	0.862
级进F₂×哈萨克Grading F₂×Kazakh	97	8.25±2.76b	0.39	0.61	0.006

杂交组合 Hybridized combination	数量 Number	尾长/cm Tail length	等位基因频率 Allele frequency		HWE (P value)
杂交组合 Hybridized combination	数量 Number	尾长/cm Tail length	C	A	HWE (P value)
级进F₂ Grading F₂	303	11.06±2.21a	0.73	0.27	0.002
级进F₂×F₁ Grading F₂×F₁	134	10.66±2.64a	0.65	0.35	0.862
级进F₂×哈萨克Grading F₂×Kazakh	97	8.25±2.76b	0.39	0.61	0.006

TBXT c.C334A 基因型 TBXT c. C334A genotype	数量 Number	尾长/cm Tail length	等位基因频率 Allele frequency		加性效应 Additive effect	显性效应 Dominant effect	等位基因频率 Allele frequency		替代效应 Substitution effect	c.C334A解释百分比 Percentage explained by c.C334A
TBXT c.C334A 基因型 TBXT c. C334A genotype	数量 Number	尾长/cm Tail length	C	A	加性效应 Additive effect	显性效应 Dominant effect	α₁	α₂	替代效应 Substitution effect	c.C334A解释百分比 Percentage explained by c.C334A
CC	55	12.41±1.32a
CA	65	9.93±2.18b	0.65	0.35	2.62	0.14	0.90	-1.67	2.57	43.96%
AA	14	7.18±3.51c

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