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肉用麻鸭是我省近年来饲养较多的肉鸭品种,具有生长快,抗病力强等特点。但目前还没有肉用麻鸭的营养需要标准,因此配合饲料时多参照NRC(1994)北京鸭营养需要和我国在1986年确定的肉鸭营养需要。鉴于这些标准制定条件的特殊性及我省饲料资源情况,实践证明参照这些标准配合的饲料并不能充分发挥肉用麻鸭的生产性能,深入研究我国饲料资源情况下肉用麻鸭对蛋白质的适宜需要量,对于充分发挥其生产性能和合理利用地方饲料资源具有重要重义。 相似文献
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朱泽远 《兽药与饲料添加剂》2000,5(5):41-43
早在公元前 4500年,我国开始驯化鸭子,开始了世界历史上养鸭的历程。据联合国粮农组织统计, 1993年全球鸭只存栏数为 6. 5亿只,我国就有 4.3亿只,居世界第一。由于肉鸭商品率高,生活力强耐粗放饲养,养鸭条件比养肉鸡要求低,疾病也少,因此,肉鸭饲养业是一种投资少、见效快、效益高的产业。目前,我国已建立一批大型养鸭场和肉鸭加工企业,如江苏南京桂花鸭集团。养鸭要发展,肉鸭营养研究要跟上。肉鸭营养研究还远不如肉鸡系统和深入,其主要原因有二:其一,由于消费习惯,多数发达国家并不喜欢食用肉鸭,因此并不重视肉鸭营养研… 相似文献
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樱桃谷肉鸭日粮能量、粗蛋白需要量的研究 总被引:2,自引:0,他引:2
樱桃谷肉鸭日粮能量、粗蛋白需要量的研究王仲樱桃谷肉鸭是当前肉鸭的主要良种之一,肉用性能好,饲养十分普遍。国内尚没有研究过其营养需要,没有统一的饲养标准,有必要进行一系列试验研究,以确定其各饲养阶段营养水平,配制日粮,指导生产。本试验通过两种不同能量、... 相似文献
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目前饲养肉鸭普遍存在的问题是:同样的饲料,同样的饲养管理,同样的畜舍饲养,由于鸭苗质量的差异,料肉比可相差0.1~0.2,对养殖户来讲饲养每只肉鸭由于鸭苗质量的差异要少收入0.5~1.0元。若每批饲养肉鸭5000只,一年就少收入1.5~3.0万元。所以鸭苗的质量非常的关键和重要!现在的父母代肉种鸭场,要充分发挥肉种鸭的遗传潜力,生产出更多优质健康的鸭苗无论是对种鸭场本身还是对广大的肉鸭养殖户都至关重要。由于肉种鸭的繁殖培育时间相对较短,可参考资料少,大家在肉种鸭营养和管理方面的许多工作都参照肉种鸡的要求,结果饲养的肉种鸭效果不理想。肉种鸭与肉种鸡的生理特性不同,肉种鸭的营养调制和日常管理正在探讨摸索中,要养好肉种鸭,发挥出更好的性能,我认为应该从以下几个方面做好工作。 相似文献
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英国的樱桃谷肉鸭,是目前较受欢迎的肉鸭品种。该鸭种适应性强,生长迅速,生长期短,饲养至7周龄,体重可达2.5公斤以上,经济效益较高。近年引进我国饲养,发展极快。因此,有需要研究樱桃谷肉鸭在当地条件下饲养的营养需要。 相似文献
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肉鸭品种的遗传改良促进肉鸭生长速度越来越快,料肉比大幅降低,但是抗病能力也随之下降。当前的养殖环境疾病复杂,在这种环境下最大限度减少肉鸭养殖风险,使效益最大化,需要在饲养管理、饲料营养、疾病防治方面不断改进。 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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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