黄土高原甘肃鼢鼠危害及防治研究 (Ⅰ)甘肃鼢鼠的繁殖研究

Study on the habits of Gansu zokor and its control in the loess plateau (Ⅰ) on the reproduction of Gansu zokor

本文通过对1988年所采568个标本的剖检分析研究表明,甘肃鼢鼠繁殖始于3月,4～5月为繁殖盛期,7月终止繁殖。性比为36.80％,雌体显著多于雄体。1年产1胎,妊娠率为40.08％,胎仔1～5只,平均胎仔数2.53只,繁殖指数1.209。幼鼠第二年达性成熟,繁殖寿命3～4年。甘肃鼢鼠性成熟速度慢、寿命长、繁殖力低、种群数量相对稳定的繁殖特点,为防治提供了有利条件。防治时机选在越冬鼠繁殖后,幼鼠大量出现之前,繁殖基数最小,妊娠率最高的4～5两月为好。秋后再防治一次,即可将密度降低到不足以引起危害的数量水平。

The analysis results from inspection dissection of 568 samples collected in the year of 1988 showy that the reproduction of the Gansu zokor begins in March, and reaches prosperous period in April and May. The sexual rate is 36.80%, the female is much more than male. The time of annual birth is only one, the gestation rate is 40.08%, number of the young zohor from one birth is 1～5, being averaged for 2.53, the reproduction index is t.209. The young zokors become sexual-matured in the second year, the lifetime of reproduction is 3 to 4 years. The nature of Gansu zokor in slow sexual mature, long life, low reproductivity and relatively stable number in communities creates favourable condition to harness. The opportunity selected to harness is after the reproduction of overwintering zokor and/or before the birth of great number of the young zokor, i.e., April and May is the adoptable time of harness when the base of reproduction is the lowest and the gestation rate the highest. It is suggested to harness for another time afterauturne could decrease the zokor density so greatly that the number might not induce harm.