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Heritability and genetic correlations for infectious hypodermal and hematopoietic necrosis virus load, body weight at harvest, and survival rate in Pacific white shrimp (Litopenaeus vannamei)
Journal of the World Aquaculture Society ( IF 2.3 ) Pub Date : 2019-11-07 , DOI: 10.1111/jwas.12664
Hortencia Hernández‐Ruíz 1 , Hugo H. Montaldo 2 , Jaime Bustos‐Martínez 3 , Gabriel R. Campos‐Montes 4 , Héctor Castillo‐Juárez
Affiliation  

Heritability and genetic correlations for body weight at harvest size (BW), grow‐out survival (SU), and log‐transformed infectious hypodermal and hematopoietic necrosis virus (IHHNV) load (VLln) in Litopenaeus vannamei were estimated. Data were obtained in 2012 from a shrimp breeding population in Mexico using 12,440 shrimp for BW and 16,814 shrimp for SU, and quantitative polymerase chain reaction determinations from 160 full‐sib families were obtained for VLln. DNA was extracted from pooled muscle samples of six shrimp per family for a total of 960 individuals. Heritability estimates for BW, SU, and VLln at the family mean and at individual levels were 0.24 ± 0.08, 0.02 ± 0.01, 0.42 ± 0.45, and 0.08 ± 0.11, respectively. Genetic correlation estimates of BW with SU, BW with VLln, and VLln with SU were 0.40, −0.04, and −0.57, respectively. Our results suggest that VLln has genetic variation and a favorable genetic association with BW and SU. No serious drawbacks were found from selection responses estimated using single‐trait and multitrait indices to increase BW and SU and decrease VLln. Favorable correlated responses for IHHNV tolerance estimated as BW/VLln and SU/VLln were also found. This study offers new insights into the possibility of using IHHNV viral load as a possible selection criterion in L. vannamei breeding programs.

中文翻译:

太平洋白虾(南美白对虾)感染性皮下和造血坏死病毒的载量,收获时的体重和成活率的遗传力和遗传相关性

估计了南美白对虾体重在收获量(BW),成活率(SU)和对数转化的传染性皮下和造血坏死病毒(IHHNV)负荷(VL ln)的遗传力和遗传相关性。2012年获得的数据来自墨西哥的一个虾类繁殖种群,其中BW为12,440虾,SU为16,814虾,VL ln的定量分析来自160个全同胞科。从每个家庭六只虾的合并肌肉样本中提取DNA,总共960个人。BW,SU和VL ln的遗传力估计家庭平均水平和个人水平分别为0.24±0.08、0.02±0.01、0.42±0.45和0.08±0.11。BW的遗传相关估计与SU,BW与VL LN和VL LN与SU是0.40,-0.04,-0.57和分别。我们的结果表明VL ln具有遗传变异,并且与BW和SU具有良好的遗传关联。使用单性状和多性状指数估算的选择反应不会增加BW和SU并降低VL ln,没有发现严重的弊端。IHHNV耐受性的良好相关响应估计为BW / VL ln和SU / VL ln也被发现。这项研究为在南美白对虾繁殖计划中使用IHHNV病毒载量作为可能的选择标准提供了新的见解。
更新日期:2019-11-07
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