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 (VL_ln) 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 VL_ln. DNA was extracted from pooled muscle samples of six shrimp per family for a total of 960 individuals. Heritability estimates for BW, SU, and VL_ln 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 VL_ln, and VL_ln with SU were 0.40, −0.04, and −0.57, respectively. Our results suggest that VL_ln 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 VL_ln. Favorable correlated responses for IHHNV tolerance estimated as BW/VL_ln and SU/VL_ln 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。