共查询到20条相似文献，搜索用时 156 毫秒
1.
2.
陈兴龙 《河南畜牧兽医(综合版)》2002,23(5):44-44
１选择高产奶牛品种要想使奶牛获得高产，奶牛品种本身是关键，决定着奶牛产奶量。各养奶牛户购买奶牛时，尽量从大城市的郊区购买奶用体型比较好、３～５岁以内的青壮年中国荷斯坦奶牛或其它杂交奶牛，这些奶牛经高产奶牛改良，产奶量高，体型也比较大。２合理搭配饲料养奶牛户由于缺乏对青贮饲料的认识，许多养奶牛户常年不给泌乳牛饲喂青贮料，使奶牛产奶量下降，影响奶牛户的经济收入。因此，要提高奶牛的产奶量，充分利用本地饲料资源，有条件的养奶牛户挖青贮窖，进行全株玉米青贮，每天给泌乳牛饲喂１０～１５千克青贮料，将会提高泌… 相似文献
3.
为了探索不同档次产奶量的奶牛投入与产出情况,寻找最佳经济效益区间,我们对金华市户养奶牛情况进行了调查研究,并从技术经济的角度分析了得失。调查与比较 1990年8—9月间,我们对养奶牛比较集中的村,采用普查的方法实地调查了147个养牛户,通过将各不同胎次的产奶量统一换算成第五胎产奶量,并剔除一些不可比的因素,选出123头有效统计头数,分别以第五胎产奶量为标准,划分了3000— 相似文献
4.
通过对双城市户养奶牛饲养现状进行抽样调查与分析,提出根据奶牛的生理特点和产奶规律配制日粮,按生理阶段进行精粗料的调整,饲喂TMR。采取科学的管理措施来减少户养奶牛疾病的发生率和提高产奶量,达到节本增效的目的。 相似文献
5.
孟宪生 《养殖与饲料．饲料世界》2004,(3):19-19,28
农户培育高产奶牛，对于提高饲料报酬，降低饲养成本，增加产奶量，提高经济效益等都有着密切的关系。从养奶牛生产实践中来看，影响奶牛产奶量的因素很多，其中选育工作是创高产的前提，饲养管理是发挥产奶 相似文献
6.
7.
近年来，郑州市奶牛业有了长足的发展，出现不同程度的“养奶牛热”现象，据统计，２０００年全市存栏奶牛１万余头，今年市政府启动“奶业工程”，实施学生奶计划，规划在５年内建成１００个奶牛养殖小区，将有力地推动我市奶牛业的发展。由于有些养奶牛户刚开始起步，缺乏奶牛的饲养管理知识，致使饲养的奶牛产奶量较低，影响养奶牛户的积极性及经济效益。笔者主要从品种及饲养管理等方面谈谈提高奶牛产奶量的措施。１选择高产奶牛品种现在全国各地都处于大力发展奶牛的时期，奶牛品种参差不齐，要想使奶牛获得高产，奶牛品种本身是关键，… 相似文献
8.
李晓波 《北方牧业(奶牛)》2006,(2):45-45
河北省迁安市太平庄乡某养殖户养奶牛4头．2005年12月份有一头奶牛出现食欲减退、产奶量下降、日渐消瘦的症状，于12月26日来我站求治。 相似文献
9.
乳房炎是乳腺发生各种不同性质的炎症，是奶牛泌乳期最多发的一种乳房疾病。影响泌乳机能和产奶量，对养奶牛业危害极为严重，且危害健康。 相似文献
10.
11.
12.
13.
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
14.
15.
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
17.
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
18.
19.
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