显性效应对内蒙古绒山羊产绒量和绒纤维直径育种值估计准确性的影响

doi:10.11843/j.issn.0366-6964.2025.02.009

Abstract

Abstract:

The aim of this study was to analyze that whether the accuracy of breeding value prediction for cashmere traits in Inner Mongolia cashmere goats was improved if dominance effects were added in animal genetic evaluation models. Based on the Illumina GGP_Goat_70K BeadChip sequencing data from 2 256 individuals of Inner Mongolia cashmere goats (Aerbas type), the phenotype and pedigree records of cashmere traits(cashmere diameter, cashmere production) were collected from individuals at age 1 to 8 years old.Two animal models were established according to whether dominance effects were taken into account or not. The genetic parameters and breeding values were estimated using the BLUP and GBLUP methods.And the accuracy of the estimated breeding values of cashmere traits was further evaluated by the cross-validation method, which was used to determine the optimal model. Finally, a multivariate animal model was established to estimate the genetic correlation and accuracy of breeding value prediction for both of the traits.And the differences in genetic parameters and breeding value accuracy between single trait and multi trait models were compared. The results showed that when the dominance effects were not considered in the animal model, the additive heritabilities for cashmere production using the BLUP and GBLUP methods were 0.156 and 0.215, and the accuracy of breeding value estimation was 27.58% and 60.33%, respectively; and the additive heritabilities for cashmere diameter were 0.252 and 0.292, and the accuracy of breeding value estimation was 28.08% and 62.33%, respectively. When both additive and dominance effects were considered in the animal model, the additive heritabilities for cashmere production using the BLUP and GBLUP methods were 0.150 and 0.200, and the dominant heritabilities were 0.147 and 0.070, with breeding value estimation accuracies of 38.50%and 72.62%, respectively; And the additive heritabilities for cashmere diameter were 0.263 and 0.290, and the dominant heritabilities were 0.288 and 0.026, and the accuracy of breeding value estimation was 39.66% and 65.97%, respectively.Under the best model, the genetic correlation between cashmere production and cashmere diameter was 0.340 0, and the phenotypic correlation was 0.038 5.Compared to that in single trait animal model, the accuracy of breeding value estimation for cashmere production and cashmere diameter was increased by 9.81%-19.43% and 14.01%-21.97%, respectively. In summary, the cashmere production have moderate to low heritability, and the cashmere diameter have moderate to high heritability. The genetic correlation between the two traits is relatively small, indicating that genetic improving for cashmere production will not cause thickening of cashmere diameter. The accuracy of breeding values estimation for the two traits by GBLUP method is significantly higher than that with BLUP method, with a 10.92% to 12.29% increase in cashmere production and a 3.64% to 11.58% increase in cashmere diameter. The accuracy of breeding value estimation under multi trait animal models is higher than that with single trait animal models. When both additive and dominance effects are considered in the animal model, the accuracy of genomic prediction can be significantly improved, indicating that the influence of dominance effects should be considered in the breeding process of Inner Mongolia cashmere goats in terms of cashmere production and cashmere diameter.

Key words: Inner Mongolia cashmere goat, cashmere diameter, cashmere production, dominance effects, accuracy of estimated breeding value

CLC Number:

S827.2

XI Haijiao, LI Jinquan, ZHANG Yanjun, WANG Ruijun, LÜ Qi, MEI Bujun, WANG Na, SU Rui, WANG Zhiying. Influence of Dominance Effects on the Accuracy of Breeding Value Estimation of Cashmere Production and Cashmere Diameter in Inner Mongolia Cashmere Goats[J]. Acta Veterinaria et Zootechnica Sinica, 2025, 56(2): 571-581.

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References 37

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性状 Trait	性别 Sex	样本量 Sample	平均值 Mean	标准差 Standard deviation	变异系数/% Variation coefficient	最大值 Maximum	最小值 Minimum
产绒量/g Cashmere production	公	613	1 001.62	430.41	43.08	2 390	118
	母	8 570	726.37	187.36	25.79	1 910	101
	总	918 3	740.31	215.28	29.07	2 390	101
绒纤维直径/μm Cashmere diameter	公	613	15.06	1.04	6.91	18.40	12.82
	母	8 570	15.24	0.78	5.11	18.66	12.73
	总	9 183	15.23	0.81	5.31	18.66	12.73

方法 Method	σ_a²	σ_d²	σ_d_d²	σ_e²	σ_y²	h_add²	h_dom²	r	logL
BLUP(add)	6 174.9	—	7 620.1	25 700.2	39 495.2	0.156	—	0.35	-51 344.77
BLUP(add+dom)	5 918.4	5 784.2	2 045.9	25 708.7	39 457.2	0.150	0.147	0.35	-51 345.43
GBLUP (add)	8 249.1	—	4 718.3	25 400.6	38 368.0	0.215	—	0.34	-46 285.38
GBLUP(add+dom)	7 684.9	2 679.4	2 639.6	25 396.3	38 400.2	0.200	0.070	0.34	-46 286.98

方法 Method	σ_a²	σ_d²	σ_d_d²	σ_e²	σ_y²	h_add²	h_dom²	r	logL
BLUP(add)	0.130 3	—	0.062 7	0.324 6	0.517 6	0.252	—	0.37	-602.89
BLUP(add+dom)	0.134 4	0.147 6	0.000 2	0.229 9	0.511 9	0.263	0.288	0.55	-722.44
GBLUP (add)	0.148 9	—	0.035 9	0.316 5	0.501 3	0.292	—	0.37	-387.92
GBLUP(add+dom)	0.145 1	0.012 9	0.026 5	0.316 5	0.501 0	0.290	0.026	0.39	-388.08

方法 Method	准确性/% Accuracy	准确性标准差 Standard deviation of accuracy
BLUP (add)	27.58^b	0.138 6
BLUP(add+dom)	38.50^a	0.279 0
GBLUP (add)	60.33^b	0.062 7
GBLUP(add+dom)	72.62^a	0.100 1

方法 Method	准确性/% Accuracy	准确性标准差 Standard deviation of accuracy
BLUP (add)	28.08^b	0.150 7
BLUP(add+dom)	39.66^a	0.305 8
GBLUP (add)	62.33^b	0.076 3
GBLUP(add+dom)	65.97^a	0.096 7

Influence of Dominance Effects on the Accuracy of Breeding Value Estimation of Cashmere Production and Cashmere Diameter in Inner Mongolia Cashmere Goats

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性状 Trait	绒纤维直径 Cashmere diameter	产绒量 Cashmere production
绒纤维直径 Cashmere diameter	0.260 3(0.325 5)	0.386 8(0.340 0)
产绒量 Cashmere production	0.038 5(0.038 5)	0.145 8(0.189 5)

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