如何提高工蜂育成率

<正>工蜂育成率是指蜂王在正常情况下产下1框卵从哺育、羽化到新蜂出房成为成蜂的比值。工蜂育成率直接影响蜂群繁殖速度和工蜂体质的好坏,影响蜂群产值,那么,影响工蜂育成率的原因有以下几方面:一、气候原因在气候影响因素中,温度和湿度尤为重要。我国南方夏季炎热,当温度超过蜂群自我调节能力时会造成育成率降低,蜜蜂出现卷翅病;而北方春秋季节低温导致外界蜜粉缺少,巢内蜜粉不足,低温导致蜂群结团,     

规模养猪场如何实施保健计划提高养猪“三率”的探讨

根据猪的生物学特性和生长发育规律，结合猪场实际，采取积极主动的措施，综合运用消毒、隔离、免疫、预防性用药等技术。合理组装，使之相互衔接，最大限度地抑制发病因素，充分发挥猪的生长发育潜能，提高养猪“三率”，即仔猪成活率、断奶仔猪育成率和商品猪育成率，提高经济效益，是值得探讨的问题。     

提高雏鸡育成率的关键技术

雏鸡饲养管理的好坏,对雏鸡的育成率和整个养鸡生产都有很大的关系。因此,在养鸡生产实践中,只有认真抓好雏鸡的饲养管理,彻底提高雏鸡的育成率,才能有效提高养鸡的经济效益。     

蛋鸡粪便铜排泄率的研究

试验蛋鸡分为育成和产蛋两个阶段,每个阶段蛋鸡分5组,每组5只鸡采用全收粪法分别收集并测量各组试验鸡的产粪量和采食量,分春、夏、秋、冬四季进行代谢试验,每季连续采样5 d.结果表明,育成、产蛋鸡饲料铜分别平均为11.41 mg/kg和10.02mg/kg;育成、产蛋鸡粪铜分别为20.46和18.19 mg/kg;育成与产蛋鸡平均日产铜分别为0.428和0.519 mg/只.研究表明,粪铜与料铜水平相关性较好,铜排泄率随摄入的铜增加而提高;产蛋鸡的铜排泄率低于育成鸡,铜在产蛋鸡和育成鸡的分配模式上不同.研究结果为推进环境友好型蛋鸡业的发展提供基础依据.     

提高新区细毛羊繁殖育成率研究报告

针对四川绵羊养殖新区羔羊、周岁羊育成率低的问题，主攻了繁殖母羊配种期、妊娠期、哺乳期、羔羊断奶期的关键技术，提出了“提高新区细毛羊繁殖育成率的技术要点”。１９９１～１９９４年度参试母羊９２９只次，产羔母羊７２４只次，产羔８１２只，产羔率１１２．１５％。羔羊断奶成活率９０．０３％，周岁羊育成率７５．５７％，羔羊平均断奶体重２３．９０ｋｇ（公羔２５．３０ｋｇ，母羔２２．４９ｋｇ，周岁羊平均体重４０．７９ｋｇ（公羊４４．９５ｋｇ，母羊３６．６３ｋｇ），分别比１９９１年试前提高１７．８６、３０．９个百分点和２．７７、１１．８８ｋｇ。     

提高雏鸡育成率的关键技术

雏鸡饲养管理的好坏，对雏鸡的育成率和整个养鸡生产都有很大的关系。因此，在养鸡生产实践中，只有认真抓好雏鸡的饲养管理，彻底提高雏鸡的育成率，才能有效提高养鸡的经济效益。     

气候生态因子对仔猪育成率的影响

本文定量研究了不同月份气候生态因子（温度、湿度、寒潮）对仔猪育成率的影响，结果表明：在开放式无保温设施猪舍饲养条件下，寒潮及２０℃以下，２６℃以上的气温对仔猪育成率有显著影响，而且高温热应激的影响有延续效应。     

受体牛移植后再次放栓对妊娠率的影响

本试验采用对移植后的受体牛再次阴道内放入本牛用过的CIDR（孕酮阴道栓）的方法,对妊娠率进行对比研究。结果表明：再次放栓组妊娠率（育成牛63.64%和经产牛60.98%）略高于未再次放栓组（育成牛53.66%和经产牛53.85%）,但无显著性差异（P〉0.05）。     

提高后备鸡育成率指标的措施

在后备鸡培育过程中，广大饲养管理者需重点做好鸡群存活率与体重的相关管理工作，以确保较高水平的后备鸡育成率。     

提高肉鸡育成率的措施

提高肉鸡的育成率是肉鸡养殖的关键,可以很大程度的提高养殖场的经济效益,因此应该采取一定的措施来提高育成率,在雏鸡的选择上要符合一定的标准,做好进雏前的准备工作,为肉雏鸡提供舒适的生活环境,同时保证雏鸡合理的饲养密度,提供充足的饮水,进行合理的饲喂,做到定时定量,还要做好雏鸡的防病驱虫工作。     

中国饲料工业协会第五届理事会顾问、会长、常务副会长、副会长、秘书长、副秘书长、常务理事、理事名单

顾问刘中一张德邻宋瑞祥聂振邦张子仪戎易王维四会长白美清国务院原副秘书长、第四届理事会会长常务副会长(8人,以姓氏笔划为序)刘永好新希望集团董事长、第四届理事会副会长刘汉元通威股份有限公司董事长、第四届理事会副会长陈丹广东恒兴集团股份有限公司董事长、第四届理事会副会长张延喜农业部原副部长、第四届理事会副会长吴明夏湖南正虹科技发展股份有限公司董事长、第四届理事会副会长陶一山唐人神集团股份有限公司董事长、第四届理事会副会长温鹏程广东温氏食品集团有限公司董事长、第四届理事会副会长谭竹洲原化学工业部副部长、第…     

Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog

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.     

The influence of the width of the saddle tree on the forces and the pressure distribution under the saddle

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.     

浅谈对症用药

对症用药就是通过对患病信鸽的症状进行诊断,进而确定病属,选择药物及如何用药的方法。     

军犬鉴别中的嗅源培养和易出现的问题及对策

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.……     

Observations on the Pathology of the Spleen of the Cat

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.