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<正> 我市目前全年饲养春、夏、中秋、晚秋四期蚕,为更好地提高养蚕生产的效益,我们从1990年以来,从本地实际出发,在收蚁时间和各季养蚕数量上进一步作了调整,做法是适当推迟春蚕的收蚁时间,增加春蚕饲养量,养足春蚕;适量饲养夏蚕;适当推迟中秋蚕收蚁时间,平衡中、晚秋蚕发种量。实践证明,这一措施的实施,有利于增加产量,提高茧质,使国家、企业和蚕农三满意。我市在各批蚕的收蚁时间调整上,主要是将春蚕和中秋蚕收蚁时间,分别往后推迟了3—5天(表1)。 相似文献
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中秋蚕发生大面积农药中毒的思考 总被引：3，自引：0，他引：3
嘉兴市南湖区2006年中秋共发蚕种15680张,8月30日收蚁,收蚁当天就有蚕农发现蚕儿农药中毒,呈现症状是摆胸、拒食、陆续死亡,一直延续到上蔟,蔟中还有不结茧蚕发生。中秋蚕全区共损失蚕种4500张,占发种量的28.7%,张种产量20kg,是三秋改二秋布局调整以来产量最低的1年,很多农 相似文献
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草桥镇位于新沂市西部，栽桑养蚕历史悠久，蚕农养蚕经验丰富，现有桑田面积5000亩（1亩≈667m^2，下同），蚕茧收入是草桥蚕农的主要经济来源。2003年以前，草桥镇一直推行一年养四批蚕的生产布局，即：5月份养春蚕，7月份养夏蚕，8月份养中秋蚕，9～10月份养晚秋蚕，其中夏蚕养的最少，中秋次之。后来由于多种原因，夏蚕饲养量持续增加，而中秋饲养量大幅度下降，至2000年夏蚕饲养量已超过中秋。中秋蚕期正值农作物、杨树等大量用药时期，加之气温高，空气闷热，给此时的中秋蚕作安全造成严重威胁，中秋蚕正常年景平均单产每张20kg左右，而2002年平均仅4kg。为此，2003年草桥镇被迫取消了中秋蚕，全年养蚕布局调整为“四改三”，即二秋改一秋，全年四批蚕改为三批蚕，并适当增养夏蚕，提早晚秋蚕收蚁时间。[第一段] 相似文献
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湖州市重点蚕区2008年的中秋蚕于8月29日发种，31日收蚁饲养。至5龄第3～4天，各地普遍反映蚕讯良好，发育齐一，蚕体粗壮强健，基本上没有发生工业、农药污染危害与蚕病损失。当时预测，该年中秋蚕将是少有的大丰收年份，全市平均张产将超过40kg，部分地区将达到45kg以上。然而，让人意料不到的是，上蔟期气候异常，结果大批中秋茧由于解舒率太低，吊糙太多不能缫丝，只能忍痛改制丝绵，造成了近数十年来从未发生过的重大损失。现对这次中秋茧质量大幅度下降的原因作一探讨。 相似文献
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2003年我市中秋蚕普遍发生农药中毒，中毒情况之重，中毒面积之广，中毒损失之多是我市历史上所罕见的。据调查：全市所有的中秋蚕都不同程度地发生了中毒，有三分之一的蚕户损失达到30％以上，有部分蚕户甚至颗粒无收。不但影响了我市的蚕茧质量， 相似文献
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对孙庄镇中秋蚕农药中毒的主要原因进行了分析，针对孙庄镇蚕区农作物布局不合理、农药污染环境和桑叶、蚕农对农药的特性不了解等情况，提出了科学规划合理调整桑园布局、合理进行大田治虫、高度重视桑园治虫、慎重选用桑园农药、防止蚕室蚕具和养蚕用品农药污染、重视对中毒蚕的处理等预防中秋蚕中毒的措施。 相似文献
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近几年来,水稻、柑桔等作物除虫时,大量使用杀虫双农药,使桑叶或蚕室周围环境被污染,导致家蚕中毒。尤其是早中秋蚕期,发生大面积微量中毒现象,蚕儿老熟后上山不结茧,损失十分严重。在1989年、1990年的早秋蚕生产实践中,笔者发现发生杀 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引：1，自引：0，他引：1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献
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嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.…… 相似文献
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Meschan EM Peham C Schobesberger H Licka TF 《Veterinary journal (London, England : 1997)》2007,173(3):578-584
As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks. 相似文献
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