调查早期产蛋选择(产蛋前90d)对产蛋特性的影响,累积选择响应(CSR),和促性腺激素(FSHβ和LHβ)的mRNA表达,和它们的受体(FSHR和LHR),在日本鹌鹑是目标。选择实验共有1293名女性,257个来自基群和1036个来自4个选定世代。性成熟时的年龄和体重(ASM,BWSM),第一个鸡蛋的重量(WFE)天到前10个鸡蛋(DF10E),前10个鸡蛋的鸡蛋质量(EMF10E),鸡蛋重量(EW),产蛋的前90d(EN90D),和产蛋前90天(EM90D)的蛋量都被记录。大多数产蛋性状的遗传力估计为低至中等,范围为0.17至0.33。,其中EN90D(0.33)和BWSM(0.32)的估计值最高。除了EN90D,在ASM和其他产蛋性状之间观察到低至中等的正遗传相关性(0.17-0.44)。第4代显示显著(P<0.05)较低的ASM和DF10E但较高的BWSM,WFE,EN90D,EM10E,和EM90D与基代相比。ASM(-6.67d)的企业社会责任显著(P<0.05),BWSM(27.13g),WFE(0.93g),DF10E(-1.25d),EN90D(7.24鸡蛋),EM10E(10.57克),和EM90D(140.0克)。FSHβ,LHβ,FSHR,和LHR基因mRNA表达在第四代中显著高于(P<0.05)。总之,取决于产蛋效率的选择程序(EN90D)可以提高产蛋性状的遗传增益并上调FSHβ的mRNA表达,LHβ,FSHR,和LHR基因在选定的鹌鹑(第四代)。这些发现可能有助于加强育种计划,并创造高产蛋日本鹌鹑的商业生产线。
Investigating the impact of early egg production selection (the first 90 d of laying) on egg production features, cumulative selection response (CSR), and the mRNA expression of gonadotropins (FSHβ and LHβ), and their receptors (FSHR and LHR), in Japanese quails was the goal. The selection experiment involved 1293 females in all, 257 from the base group and 1036 from the 4 selected generations. Age and body weight at sexual maturity (ASM, BWSM), weight of the first egg (WFE), days to the first 10 eggs (DF10E), egg mass for the first 10 eggs (EMF10E), egg weight (EW), egg number at the first 90 d of laying (EN90D), and egg mass at the first 90 d of laying (EM90D) were all recorded. Most egg production traits had heritability estimates that were low to moderate and ranged from 0.17 to 0.33., where the highest estimates were reported for EN90D (0.33) and BWSM (0.32). With the exception of EN90D, low to moderate positive genetic correlations were observed between ASM and other egg production traits (0.17-0.44). The fourth generation showed significantly (P < 0.05) lower ASM and DF10E but higher BWSM, WFE, EN90D, EM10E, and EM90D when compared with the base generation. CSR were significant (P < 0.05) for ASM (-6.67 d), BWSM (27.13 g), WFE (0.93 g), DF10E (-1.25 d), EN90D (7.24 egg), EM10E (10.57 g), and EM90D (140.0 g). FSHβ, LHβ, FSHR, and LHR gene mRNA expression was considerably (P < 0.05) greater in the fourth generation compared to the base generation. In conclusion, selection programs depending on the efficiency of egg production (EN90D) could improve the genetic gain of egg production traits and upregulate the mRNA expression of FSHβ, LHβ, FSHR, and LHR genes in selected quails (fourth generation). These findings might help to enhance breeding plans and create commercial lines of high egg production Japanese quails.