Poultry Production Department, Faculty of Agriculture, Fayoum University, Fayoum, Egypt.
Anim Biotechnol. 2023 Dec;34(7):2414-2419. doi: 10.1080/10495398.2022.2094800. Epub 2022 Jul 8.
The main objectives of this study were to estimate genetic parameters for the survival, longevity and evaluate risk factors for the occurrence of mortality in a Japanese quail line selected for high growth rate during the period from hatch to 21 days of age (GR) for eight generations and its control. Total number of 1095, 2289 and 16,506 for sires, dams and progeny, respectively, was used to estimate genetic parameters, a separate hatch of 687 chicks was used to examine the risk factors of quails in the selected (SL, 438) and control (CL, 249) lines. The proportion of censored quails until 42 days of age was 82.20 and 87.14 for SL and CL, respectively. The CL showed higher longevity than SL (38.42 vs. 36.86 days). In the two tested lines, mortality% significantly declined when body weight at death increased, however, the CL had a higher reduction of mortality% than the SL (50 vs. 42%). Survival and longevity had low heritability values, low genetic and phenotypic correlations between survival and longevity with GR and ranging from 0.025 to 0.208. The survival tended to be less correlated with GR and body weight at marketing age than the longevity.
本研究的主要目的是估计遗传参数，包括生存、长寿，并评估从孵化到 21 日龄（GR）期间选择高生长速度的日本鹌鹑品系（GR）及其对照品系的死亡率发生的风险因素。共使用了 1095 只、2289 只和 16506 只种鸡、母鸡和后代来估计遗传参数，一个单独的孵化 687 只小鸡用于检查选择（SL，438 只）和对照（CL，249 只）品系鹌鹑的风险因素。在 42 日龄之前被淘汰的鹌鹑比例分别为 SL 和 CL 的 82.20%和 87.14%。CL 的长寿性高于 SL（38.42 天对 36.86 天）。在两个测试的品系中，死亡率随着死亡时体重的增加而显著下降，但是 CL 的死亡率下降幅度高于 SL（50%对 42%）。生存和长寿的遗传力值较低，生存和长寿与 GR 之间的遗传和表型相关性较低，范围为 0.025 至 0.208。生存与 GR 和上市体重的相关性低于长寿。
