共查询到20条相似文献，搜索用时 62 毫秒
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天水刺槐种植面积大，生长良好，不论是山坡路旁，村前地边，到处都有成片的刺槐林，花期前后４０～５０天，素有立体蜜源之称。这是天水主要蜜源之一，也是天水最好的蜜源。每年有成千上万的蜂场来赶这一蜜源。由于花期单纯，蜂蜜色泽清澈透亮，是天水蜂蜜中的佳品，许多客商慕名而来。我们把这一花期优质蜂蜜的生产作为主要工作来抓，也作为宣传的主要环节。当蜂群进入场地，我们就到各蜂场大力宣传生产成熟蜜的好处，鼓励生产成熟蜜。宣传生产成熟蜜对养蜂业的积极作用，能够提高我国养蜂业在国际蜂业中的地位，能使蜂蜜在国际市场上畅销… 相似文献
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蜂王浆总糖含量和酸度是蜂王浆的两个重要理化指标，是衡量王浆是否掺有蜂蜜、是否腐败的两个重要依据。本文根据我们在收购蜂王浆时所测定的结果，对云南不同地区、不同蜜源植物的蜂王浆总糖含量和酸度作一报道。 相似文献
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环境或气候变化引起蜜蜂采集有毒蜜源植物的花蜜或蜜露,导致生产出含有植物源毒素的有毒蜂蜜,食用此类有毒蜂蜜容易引发中毒。尽管国内外食用蜂蜜中毒的具体原因存在差异,但多数食用蜂蜜中毒事件与有毒蜜源植物之间存在着较大的关联性。我国地域广阔,蜜源植物种类多样,梳理清楚有毒蜜源植物资源及其毒性对蜂蜜安全生产、毒性成分溯源等工作具有极其重要的意义。在广泛文献调研的基础上,对我国分布的15科29种有毒蜜源植物种类、分布区域及花期等进行总结,并结合文献报道的急性毒性试验结果对有毒蜜源植物毒性进行归纳,以期为蜜蜂放养场地选择、蜂蜜安全生产及中毒原因追溯提供科学参考。 相似文献
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《中国蜂业》2020,(5):20-22
<正>生产群是指具有较强蜂蜜、蜂王浆、蜂花粉等蜂产品生产能力的蜂群。要实现蜂产品的优质高效生产(如实现成熟蜂蜜高产),除了良好的蜜粉源条件外,生产群至少应拥有以下特征:适龄工作蜂个体数量达到高峰,各日龄工蜂比例合理,子脾、空脾、蜜粉脾排列结构和比例合理,工蜂健康状态良好。对于优质成熟蜂蜜生产而言,要求西方蜜蜂群势至少达到16足框4万只蜜蜂(条件允许,最好能达到20足框以上),中蜂达到8足框(2万只蜜蜂)以上。但在我国,受蜂种、蜜源条件、气候环境和药害等多种因素影响,多数自然蜂群的群势达不到以上要求,这就必须改变传统养蜂模式,在主要蜜源大流蜜期前,采取有效管理措施把生产蜂群扶壮,使群势达到优质成熟蜂蜜生产要求。 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