Nestor K E, Bacon W L, Anthony N B, Noble D O
Department of Animal Sciences, Ohio Agricultural Research and Development Center, Ohio State University, Wooster 44691, USA.
Poult Sci. 1996 Mar;75(3):303-10. doi: 10.3382/ps.0750303.
Japanese quail lines were divergently selected for 30 generations for 4-wk BW (HW, LW) or plasma yolk precursor (HP, LP) as measured by total plasma phosphorus (TPP) at the beginning of lay. The HW, LW, HP, and LP lines were initiated from a randombred control line (R1). In the ninth generation of selection in the HW line, sublines were developed by continuing to select males for increased 4-wk BW whereas females were selected for increased (HW-HP line) or decreased (HW-LP) TPP. Individual selection was used in the HW, LW, HW-HP, and HW-LP lines. In the HP and LP lines, females were individually selected whereas males were selected on their full-sisters' performance. Realized heritabilities (h2), based on the linear regression of selection responses (corrected for environmental changes) on accumulated selection differentials (weighted for the number of offspring produced) over generations, declined with selection in the HW, LW, HP, and LP lines. The h2 of 4-wk BW in the HW line was 0.42 during the first 10 generations of selection and then declined to 0.30 during the next 2 generations of selection. In the LW line, realized h2 of 4-wk BW was 0.40, 0.16, and -0.12 in Generations 1 through 10, 11 through 20, and 21 through 30, respectively. The respective h2 for TPP in the HP line were 0.29, 0.17, and 0.14. The h2 of TPP in the LP line was 0.35 during the first 10 generations and essentially zero during the next 20 generations. Four-week BW and TPP were negatively associated in the HW, HP, and LP lines. There was no significant relationship between these two traits in the LW line.
日本鹌鹑品系针对4周龄体重（高体重品系、低体重品系）或血浆卵黄前体（高血浆磷品系、低血浆磷品系）进行了30代的 divergent 选择，血浆卵黄前体通过产蛋初期的总血浆磷（TPP）来衡量。高体重品系、低体重品系、高血浆磷品系和低血浆磷品系均源自一个随机交配的对照品系（R1）。在高体重品系选择的第九代，通过继续选择4周龄体重增加的雄性鹌鹑，同时选择血浆磷增加（高体重 - 高血浆磷品系）或降低（高体重 - 低血浆磷品系）的雌性鹌鹑，培育出了亚系。高体重品系、低体重品系、高体重 - 高血浆磷品系和高体重 - 低血浆磷品系采用个体选择。在高血浆磷品系和低血浆磷品系中，雌性鹌鹑采用个体选择，而雄性鹌鹑则根据其全姐妹的表现进行选择。基于选择反应（校正环境变化）对各代累积选择差（根据所产后代数量加权）的线性回归得出的实际遗传力（h2），在高体重品系、低体重品系、高血浆磷品系和低血浆磷品系中随着选择而下降。在高体重品系中，4周龄体重的h2在选择的前10代中为0.42，在接下来的2代选择中降至0.30。在低体重品系中，4周龄体重的实际h2在第1代至第10代、第11代至第20代和第21代至第30代分别为0.40、0.16和 -0.12。高血浆磷品系中TPP的相应h2分别为0.29、0.17和0.14。低血浆磷品系中TPP的h2在最初10代中为0.35，在接下来的20代中基本为零。在高体重品系、高血浆磷品系和低血浆磷品系中，4周龄体重与TPP呈负相关。在低体重品系中，这两个性状之间没有显著关系。
