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现在,鸡蛋生产供大于求,价格水平下跌,经济效益下降。面对这种形势,许多养鸡户纷纷望风转舵,放弃优质饲料,选择劣质饲料,企图通过降低饲料成本挽回败局。殊不知,这样做不但于事无补,结果反而适得其反,误入歧途。价格低,是劣质饲料的外在表现。质量低才是劣质饲料的内在实质。劣质饲料,主要劣在两个方面。一是大量使用杂饼,二是大量使用土霉素渣粉。通常,在鸡饲料中,豆饼应占饼类饲料的绝大部分,棉籽饼、菜籽饼等杂饼只占较小比例。这样搭配,一是为了丰富各种营养物质,二是为了适当降低饲料成本,这也是配合饲料应遵循的一… 相似文献
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中蜂堪称华夏宝,具有十优特点好。 一是不畏暑热天,盛夏产卵不减少, 越夏期间群不衰,一般不需喂饲料。 二是抗寒能力强,二月采集就涌跃, 蜂群结团密集紧,蜂王开春产卵早。 三是勤奋采花粉,自晨至暮不停劳, 立春开采立冬蛰,可比意蜂长一月。 四是搜集能力强,感觉敏锐采粉料, 蜜源稀少早涝区,繁衍贮蜜减量少。 五是起飞速度俨,体小飞翔极轻巧, 由于飞行快速度,因而搜集效率高。 六是记忆力特强,始终不忘回原巢, 巢箱搬迁二公里,三天四日可找到。 七是工蜂也产卵,丧失蜂王则需要, 幼虫改为蜂王房,大量工蜂产卵巢。 八是… 相似文献
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一、树立质量意识数量和质量是对立的,又是统一的。就某项商品生产而言,没有质量,数量越多,效益越低。目前的畜牧业已经从数量型过渡到质量型。发展獭兔生产,必须树立质量意识。獭兔及其产品是商品,商品必须有其使用价值。决定其使用价值大小的依据是质量。过去确实存在忽视种兔质量的问题,认为凡公能配种,是母可产仔。见公就留,是母就配;有人认为,我买来的是好种,所生的后代必定好。其实,好种产的未必都是好种,好种未必产好皮。好种是选出来的;有人为了追求短期效益,趁市场行情好,多卖种兔,采取早配和频密繁殖,即所谓的… 相似文献
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为了追踪研究畜产品的国际贸易。特别是饲料贸易,这是第三部分。的确,全球市场的新时代已经到来,特别是蛋白质饲料,我们早已涉足这个领域。根本不可能置身于国际化大潮之外。因此,我们需要了解国际蛋白饲料的贸易全貌和情况。特别是我国,1999年肉类总产6146.8万吨,产量占世界总量(22889.6万吨)的26.9%。众所周知,动物产品都是蛋白质的转化物,植物蛋白质肯定有一定程度的短缺.这不足为奇,需要在世界范围内思考战略,才是上策。 相似文献
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新农村建设,应该是生态的、环保的、创新的。只有这样,生产出的农牧产品才能打破贸易壁垒,走向世界。一个国家的农牧业水平程度是农业现代化的标志,农牧业承前启后,前连种植业,后接加工业,是大农业的主要角色,是农民增收的重要途径。中国农牧业出路在哪里?发展方向是什么?就是生态化方向,发展生态型农牧业,建设生态、创新型养殖小区。 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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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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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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