Siopes T D
Department of Poultry Science, North Carolina State University, Raleigh 27695-7608, USA.
Poult Sci. 1995 Jun;74(6):1039-43. doi: 10.3382/ps.0741039.
Sexual receptivity of turkey hens as indicated by squatting (sexual crouch) was evaluated in three strains of breeder hens, Nicholas (N), Hybrid (H), and British United (B). The incidence of squatting was compared among strains through 84 d of photostimulation and related to egg production characteristics. Significant strain, time, and strain by time interaction effects occurred for the incidence of squatting. In all three strains, squatting started within the 1st wk of photostimulation, rapidly peaked (75.0, 65.6, and 43.0% for H, B, and N hens, respectively) at 14 d of photostimulation, then returned to lower, basal levels at or before attainment of 50% hen-day egg production. Squatting incidence was highly variable within and between strains but was generally lower in N hens than H and B hens, which showed similar squatting expression. The incidence of prelay squatting was not correlated to onset or rate of egg production. However, there was a negative correlation between squatting behavior and percentage floor eggs in H (P = .03) hens. It was concluded that squatting incidence varies within and between strains of hens and is not related to subsequent egg laying performance.
通过蹲伏（性蹲伏）来评估尼古拉斯（N）、杂交（H）和英国联合（B）三个品系的种母鸡的性接受能力。在84天的光照刺激期间比较各品系间的蹲伏发生率，并将其与产蛋特性相关联。蹲伏发生率存在显著的品系、时间以及品系与时间的交互作用。在所有三个品系中，蹲伏在光照刺激的第1周内开始，在光照刺激14天时迅速达到峰值（H、B和N品系的母鸡分别为75.0%、65.6%和43.0%），然后在母鸡日产蛋率达到50%时或之前恢复到较低的基础水平。蹲伏发生率在品系内和品系间差异很大，但N品系母鸡的蹲伏发生率通常低于H和B品系母鸡，后两者表现出相似的蹲伏表现。产蛋前蹲伏的发生率与产蛋开始或产蛋率无关。然而，在H品系母鸡中，蹲伏行为与地面产蛋百分比之间存在负相关（P = 0.03）。研究得出结论，母鸡品系内和品系间的蹲伏发生率各不相同，且与随后的产蛋性能无关。
