Mignon-Grasteau S, Minvielle F
Station de Recherches Avicoles, INRA, 37380 Nouzilly, France.
Poult Sci. 2003 Dec;82(12):1839-44. doi: 10.1093/ps/82.12.1839.
Duration of tonic immobility (TI) is a well-established criterion of fearfulness in birds, but its relation to production traits has been little studied. TI and 27 variables related to egg production and quality, feed consumption, and body condition were collected for 355 female Japanese quail. Experimental birds were the F2 generation from a reciprocal cross between a line selected for long TI and a line from a different origin and selected for early egg production. TI and several other variables had very asymetrical distributions so all variables were categorized, and the association between traits was studied by factorial correspondence analysis (FCA). Attributes of good versus poor layers were well separated by the FCA, but no association was obtained between TI and other traits on the primary axes of the FCA. Fearfulness, as measured by TI, was not related to levels of performance of egg laying quail. Secondary negative associations between TI and body temperature and between TI and residual feed consumption were obtained; however, they were marginal and need to be confirmed.
强直静止（TI）的持续时间是衡量鸟类恐惧程度的一个公认标准，但它与生产性状之间的关系鲜有研究。我们收集了355只雌性日本鹌鹑的TI以及与产蛋量和质量、采食量和身体状况相关的27个变量。实验鸟是长TI品系与来自不同来源且选择早期产蛋的品系进行正反交产生的F2代。TI和其他几个变量具有非常不对称的分布，因此对所有变量进行了分类，并通过因子对应分析（FCA）研究了性状之间的关联。FCA很好地分离了高产蛋鸡和低产蛋鸡的属性，但在FCA的主轴上，TI与其他性状之间未发现关联。通过TI衡量的恐惧程度与产蛋鹌鹑的生产性能水平无关。TI与体温以及TI与剩余采食量之间存在次要的负相关；然而，它们的相关性很微弱，需要进一步证实。
