Universidad Nacional Agraria La Molina, Lima, Peru.
Instituto Veterinario de Investigaciones Tropicales y de Altura, Universidad Nacional Mayor de San Marcos, El Mantaro, Peru.
Trop Anim Health Prod. 2020 Nov 23;53(1):34. doi: 10.1007/s11250-020-02473-6.
This study aimed to estimate genetic parameters for four guinea pig lines of a crossbreeding scheme. Two paternal lines are selected for growth rate (P1) and feed conversion rate (P2), whereas two maternal lines are selected for growth rate of litter (M1) and litter size at birth (M2). The heritabilities and genetic correlations were estimated with animal linear models employing multivariate analyses with REML. The heritabilities for birth weight (BW) were 0.21±0.02 and 0.23±0.03 for P1 and P2, respectively, and for weaning weight (WW), the heritability was 0.28±0.03 for P2. The estimates for weight at 60 days of age (W60) were 0.34±0.01 and 0.47±0.04 for P1 and P2, respectively, and for partial feed conversion rate was 0.46±0.03 for P2. Heritabilities for litter weight at birth (LW) were 0.09±0.03 and 0.10±0.03 for P1 and M1, respectively. For litter weight at 10 days of age (LW10), the heritability was 0.15±0.03 for M1. Heritabilities for litter size (LS) were 0.17±0.03, 0.20±0.03 and 0.11±0.03, and for number of pups born alive (BA) were 0.09±0.03, 0.14±0.03 and 0.09±0.03 for P1, M1 and M2, respectively. Similarly, high genetic correlations were found between BW, WW and W60 and between LW, LS, LW10 and BA. The genetic correlation between BW direct and maternal was moderately negative (- 0.24 ± 0.10) for P1. These results show the genetic status for all four guinea pig lines, which is essential for the further improvement of the currently implemented breeding programme and also indicate an opportunity for genetic improvement.
本研究旨在评估杂交方案下四个豚鼠品系的遗传参数。两个父本品系分别选择生长速度（P1）和饲料转化率（P2），而两个母本品系分别选择窝产仔数（M1）和产仔数（M2）。使用动物线性模型，通过 REML 进行多元分析来估计遗传力和遗传相关性。P1 和 P2 的初生重（BW）遗传力分别为 0.21±0.02 和 0.23±0.03，P2 的断奶重（WW）遗传力为 0.28±0.03。60 日龄体重（W60）的估计值分别为 P1 和 P2 的 0.34±0.01 和 0.47±0.04，P2 的部分饲料转化率为 0.46±0.03。P1 和 M1 的窝产仔数（LW）遗传力分别为 0.09±0.03 和 0.10±0.03。M1 的 10 日龄窝重（LW10）遗传力为 0.15±0.03。LS 的遗传力分别为 0.17±0.03、0.20±0.03 和 0.11±0.03，BA 的遗传力分别为 0.09±0.03、0.14±0.03 和 0.09±0.03，用于 P1、M1 和 M2。同样，BW、WW 和 W60 与 LW、LS、LW10 和 BA 之间存在较高的遗传相关性。P1 的 BW 直接与母本的遗传相关性为中度负相关（-0.24±0.10）。这些结果显示了所有四个豚鼠品系的遗传状况，这对于进一步改进当前实施的育种计划至关重要，也为遗传改良提供了机会。
