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十八年来我国蛋鸡业的区域化和商品生产预测 总被引：1，自引：0，他引：1
十八年来，我国畜牧业进步最快有两个领域。一是现代化水平的提高，二是畜牧生产的区域化。区域化使产区分布、生产结构、商品结构、畜牧经济、消费结构发生深刻变化。区域化本身就是资源的优化配置。它是商品经济发展，基础设施建设，生产技术进步的必然结果。而且，关系到饲料、种禽等行业和投资者。因此，有必要对生产区域化进行系统分析。因牵涉内容太多，只好分两部发表。 相似文献
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十八年来．我国畜牧业进步最快的有两个领域：一是现代化水平的提高；二是畜牧生产的区域化。区域化与产区优势、生产结构、商品结构、畜牧经济、消费结构都有重要关系。生产的区域化本身就是资源的优化配置，足经济发展必然结果．住何物质投入产出过程，随着生产发展，边际效益总是递减，最后失去竞争力，产业不得不转移到成本低的地区。虽现象残酷，但这是资源优化配置 相似文献
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自1983年以来 ,我国畜牧业进步最快有两个领域 :一是现代化水平的提高 ;二是畜牧生产的区域化。区域化使产区分布、生产结构、商品结构、畜牧经济、消费结构发生深刻变化。区域化本身就是资源的优化配置。它是商品经济发展、基础设施建设、生产技术进步的必然结果。而且 ,关系到饲料、种禽等行业和投资者。因此 ,有必要对生产区域化进行系统分析。一、我国禽蛋生产在世界上占有重要地位从表1可以得出如下结论 :1.中国禽蛋生产发展是世界第一。2000年世界禽蛋总产量5110.67万吨 ,从1983年起 ,18年增长了0.75倍 ,年递增率3.16 % ,远低于我国11… 相似文献
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改革开放以来,我国畜牧业进步最快的有两个领域:一是现代化水平的提高;二是畜牧生产的区域化。区域化与产区优势、生产结构、商品结构、畜牧经济、消费结构都有重要关系。生产的区域化本身就是资源的优化配置,是经济发展必然结果。任何物质投入产出过程,随着生产发展,边际效益总是递减,最后失去竞争力,产业不得不转移到成本低的地区。虽现象残酷,但这是资源优化配置过程。同等物质消耗,得到的产品更多,成本也更低,宏观经济越能得到发展。这就是产业转移和经济循环理论。任何产业总是沿着这一规律。世界都遵循这个规律。随着时间推移,我国商… 相似文献
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畜牧业是国民经济的重要组成部分 ,又是实施农业产业结构战略性调整的突破口 ,最近我们对奉化市畜牧生产的现状及存在问题进行了调查 ,并结合当地实际提出了今后五年发展畜牧业的总体思路和目标。1 畜牧生产现状近几年来 ,奉化市的畜牧生产发展较快。1 999年全市畜牧业总产值达到 1 .8亿元 ,占农业总产值的 2 8.5 %。发展畜牧业已成为农民脱贫致富奔小康的重要途径。据调查 ,该市畜牧生产主要有以下几个特点 :1 .1 区域化、产业化雏形基本形成 一是以块状经济为特点的专业乡 (村 ) ,如大堰、董李等乡为主的山区发展食草动物 ;莼湖、吉奇… 相似文献
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1 畜牧产业化及其与畜牧业的可持续性关系 畜牧产业化的最终目标是谋求最大的综合经济效益.按照产业化的要求,畜牧产业化必须包括以下内容:畜牧业布局区域化、生产专业化、经营规模化、服务社会化、管理企业化. 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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Observations on the Pathology of the Spleen of the Cat 总被引：1，自引：0，他引：1
Abstract— Lesions were found in the spleen of four of sixty-three cats examined post mortem in the department, and comprised two examples of lymphosarcoma, one of chronic fibrinous peritonitis and one of subcapsular haematoma. Abnormalities were found in two cat spleens received from veterinary surgeons in general practice. In one cat the abnormalities were an haemangiosarcoma with secondary deposits in the liver and in the other extensive mast cell infiltration. In addition lesions were detected in the spleen of three of eighty-seven cats examined post mortem in general practice. The lesions were: multiple secondary deposits of adenocarcinoma from a primary tumour of the mammary gland, a ruptured spleen and a foreign body below the splenic capsule. Résumé— L'examen microscopique de soixante-trois chats pratiqué dans le service a permis de rencontrer quatre fois des lésions de la rate, dont deux lymphosarcomes, une péritonite capsulaire fibrineuse et un hématome sous-capsulaire. D'autre part des lésions ont été trouvées dans deux rates de chat expédiées par des vétérinaires exerçant en pratiaue générale. Chez un chat il s'agissait d'un htmangiosarcome avec métastases hépatiques et chex l'autre d'une infilt ation diffuse par des mastocyta. De plus, on a rencontré des llésions dnas la rate de trois chats parmi quatre-vingt sept autopsies effectuées dans le cadre d'une clientèle génárale. Ces iésions étaient dés métastases multiples d'un adénocarcinome dont la tumeur primitive siègeait dam la glande mammaire, une rupture de la rate et un corps érangers sou capsulaire. Zusammenfassung— Läsionen der Milz wurden bei vier von dreiuiidsechzig in dieser hbteilung sezierten Katzen gefunden, und zwar in zwei Fällen ein Lymphosarkom, in einem Falle eine chron-ische fibrinöse Peritonitis und in einem ein subkapsuläres Hématom. Anomalien fanden sich auch in der Milz von zwei Katzen, die aus der tierxrztlichen Praxis eingesandt wurden. Bei der einen Katze war dies ein Hämangiosarkom mit Metastasen in der Leber, bei der anderen eine weitläufige Infiltration der Mastzellen. Außerdem wurden bei drei von siebenundachtzig in der Praxis sezierten Katzen Milzläsionen gefunden. Diese bestanden am multiplen Metastasen eines Adenokarzinoms der Brustdrüse, einer Milzzerreissung und einem Fremdkörper unterhalb der Milzkapsel. 相似文献