Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan.
Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Japan.
Anim Sci J. 2021 Jan-Dec;92(1):e13507. doi: 10.1111/asj.13507.
The aim of this study was to investigate the differences in fearfulness between two Japanese native chicken breeds, Tosa-Kukin (TOK) and Yakido (YKD). In a tonic immobility test, TOK breed chicks showed longer duration and lower induction number compared with YKD. The number of peeps in YKD in an isolation test was lower than that in TOK, whereas there were more bouts of peeping in YKD than in TOK. In a manual restraint test, YKD showed more active responses and initiated peeps and struggling earlier than TOK. The three behavioral tests all indicated that YKD are less fearful than TOK chickens. A latent structures discriminant (OPLS-DA) analysis was used to identify behavioral parameters that contributed to the differences between the breeds. The major parameters were duration and number of inductions in the tonic immobility test and number of struggle in the manual restraint test. These results suggest that three behavioral tests can be used together to evaluate fearfulness of Japanese native breeds of chickens.
本研究旨在探究两个日本本土鸡品种——土佐鸡（TOK）和秋田鸡（YKD）之间的恐惧差异。在僵直不动测试中，与 YKD 相比，TOK 品种的雏鸡表现出更长的持续时间和更低的诱导数。在隔离测试中，YKD 的吱吱叫声数量低于 TOK，而 YKD 的吱吱叫声次数多于 TOK。在手动约束测试中，YKD 比 TOK 表现出更多的活跃反应，更早地开始吱吱叫和挣扎。这三个行为测试均表明，YKD 比 TOK 鸡的恐惧程度更低。使用潜在结构判别分析（OPLS-DA）对导致品种间差异的行为参数进行了鉴定。主要参数是僵直不动测试中的持续时间和诱导次数，以及手动约束测试中的挣扎次数。这些结果表明，三种行为测试可以一起用于评估日本本土鸡品种的恐惧程度。
