共查询到20条相似文献,搜索用时 641 毫秒
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本文对南四湖区夏候鸟大苇莺的繁殖习性做了系统阐述,记述了该乌的求偶交配、营巢产卵、孵卵育雏、雏乌的生长发育及食性等。 相似文献
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罗非鱼繁殖适宜水温为22℃-23℃,自然产卵孵化繁育需充分利用光、热与饵料资源,必须采取人工增温,强化培育,使罗非鱼提早产卵孵化出苗。具体做法如下: 相似文献
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日粮中添加酶制剂对环颈雉繁殖机能影响的研究 总被引:2,自引:0,他引:2
主要探讨了酶制剂对环颈雉繁殖机能的影响。分别在种雉日粮中添加 0 5 %纤维素酶 +0 5 %淀粉酶、0 5 %纤维素酶 +0 5 %中性蛋白酶、0 3 %纤维素酶 +0 3 %淀粉酶 +0 4%中性蛋白酶。试验结果表明 ,种雉总产蛋数、产蛋总重及产蛋率均有明显提高 ,种蛋受精率、孵化率也有所提高 ;同时 ,料蛋比及啄蛋数、碎蛋数均有明显降低。平均蛋重及种蛋品质无显著变化 (P >0 0 5 ) ,种蛋中粗蛋白、无氮浸出物含量有所提高。综合比较 ,以添加 0 5 %纤维素酶 +0 5 %中性蛋白酶 ,作用效果最好。 相似文献
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Studies on the susceptibility of eggs of gallinaceous birds to 2,4,5,-T and 2,4-D. Second report
By spraying eggs with a herbicide containing 2,4-D prior to incubation, the effect of this substance on sex differentiation and reproductive performance of Japanese quails was studied. As compared with appropriate controls, birds originating from eggs exposed to 2,4-D showed no significant differences either in their laying capacity or in the fertility and the hatching rate of their eggs. 相似文献
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A. Egger 《Journal of pest science》1973,46(12):183-186
Summary
Contributions to bionomy and control of Xyleborus dispar F. and X. saxeseni Rtz. (Col., Scolytidae)
In the beginning of May the females ofX. dispar began to swarm. Within about a week they established their system of hatching tubes which had a mean length of 12.95 cm. In the average 28 eggs were laid in 15 days in heaps in the horizontal fork corridor. 2–3 days after the first laying of the eggs the larvae came out. The change into the chrysalis state occured in another 14–16 days. The young beetle shed after 14–16 days of larva rest their exuviae. After 4 days of feeding, the melanin formation was completed. The whole process took 33 days. A generation needed a period of 54 days stretched over the months of May and June. The sexual ratio (M:F) is 1:2 and the sexual index was 0.6. Only one generation per year was produced and hibernated in the hatching tubes until next spring. Summarizing the results give a bionomic formula of 5 – 56/6 + 6, 4 5 forXyleborus dispar.Xyleborus saxeseni showed an average of 73 offsprings per hatching site. Both Xyleborus species were controlled with Metasystox (i).
A 1180 Wien, Gregor-Mendel-Straße 33, Institut für Forstentom. u. Forstschutz der Hochschule für Bodenkultur. 相似文献
A 1180 Wien, Gregor-Mendel-Straße 33, Institut für Forstentom. u. Forstschutz der Hochschule für Bodenkultur. 相似文献
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利用椴树吸引光肩星天牛成虫产卵又抑制其卵及幼虫发育的特殊功能,对失去生物控制天牛危害能力的林木和林分,实施控虫生物因子补偿及诱控功能的放大,调控天牛种群数量。椴树和杨树分别套笼接虫,诱控树种上的平均产卵刻槽数为15.8个/株,孵化率为0;合作杨上的平均产卵刻槽数为16.1个/株,孵化率为10.56%。光肩星天牛对沙枣和几种感虫树种的嗜好程度有明显差异。在产卵刻槽数量上,加杨〉沙枣〉白桦、毛白杨、北京杨、糖槭;在取食面积上,锗槭〉沙枣〉加杨、白桦、毛白杨、北京杨。通过野外次生林椴树控虫调查结果显示,椴树的引诱距离为10m以内,引诱强度最好的距离为6~8m。以径粗6—10cm的杨树点滴注入或喷布诱控树种提取剂,50d后检查死虫数,其杀虫率在70%。 相似文献
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北红尾鸲繁殖习性及食性研究 总被引:3,自引:3,他引:0
北红尾鸲在辽宁省为夏候鸟,居留期长达半年。以多种昆虫为食,这些昆虫多为农林业的重要害虫,在抑制森林虫害的发生,维持自然生态平衡方面有较重要的作用。通过在宽甸县白石砬子自然保护区的观察,报道了该鸟的求偶与交尾、营巢与产卵,孵卵与育雏等繁殖习性,并对雏鸟的生长变化及食性进行了观察与分析。有助于对该鸟的生态进行深入研究和人工招引与利用。 相似文献
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花椒红胫潜跳甲(Podagricomela flavitibialis Wang)、花椒铜色潜跳甲(Podagricomela cuprea Wang)、花椒桔啮跳甲(Clites seiahatai Chuyo)三种跳甲都以成虫在花椒树冠下周围表土层7cm以内越冬。在花椒展叶后越冬成虫开始出土活动,4月下旬至5月中旬为产卵盛期孵化盛期,这一时期是药剂防治最关键时期。试验结果表明,花椒休眠期树冠下覆膜防治花椒三种跳甲效果显著,同时花椒树覆膜后抗旱保水、提高地温,也有明显的增产效果,且对环保无污染,安全可靠,操作简便,符合无公害农产品生产的技术要求。 相似文献