商品猪场确定种猪及精液配种价值的生物经济学方法

商品猪场选购种猪或精液时 ,需要考虑其配种的综合效果 ,这些包括配种后母猪受胎率、窝产活仔数及商品猪的日增重、饲料转化率及瘦肉率等。本文通过建立生物经济学模型模拟商品猪群生产过程 ,利用差额法计算这些指标对出栏猪利润的影响 ,确定其边际效益 ,在此基础上提出“相对配种价值”指数的概念 ,用来估计种猪及精液的综合利用价值 ,为商品猪场选择适当的种猪、精液及配种方法提供参考     

应用生物经济学方法评估种猪及精液的价值

前言 在商品猪生产流程中,配种是关键的技术环节,而公猪或者精液的质量对配种效率及后代生产性能具有重要影响。目前商品猪场多从种猪场引进种公猪,采用本交或者人工授精的方式进行配种。近年来,社会化的种猪性能测定站及猪人工授精站     

猪人工授精技术现场操作

猪人工授精技术是以种猪的培育和商品猪的生产为目的最简单有效的配种方法，是进行科学养猪、实现养猪生产现代化的重要手段。猪人工授精是指用器械采取公猪的精掖，经过检查．处理和保存，再用器械将精液输入到发情母猪的生殖道内以代替自然交配的一种配种方法。     

猪人工授精技术对母猪受胎率的影响

<正>猪人工授精技术是采集公猪的精液,经过精液品质检查、稀释、保存等一系列处理后,再将精液输入到发情母猪的生殖道内以达到受胎目的配种方法。与自然交配相比,人工授精具有能提高优秀公猪利用率、提高商品猪整齐度、减少饲养公猪数量、节     

猪人工授精技术对母猪受胎率的影响

<正>猪人工授精技术是采集公猪的精液,经过精液品质检查、稀释、保存等一系列处理后,再将精液输入到发情母猪的生殖道内以达到受胎目的配种方法。与自然交配相比,人工授精具有能提高优秀公猪利用率、提高商品猪整齐度、减少饲养公猪数量、节     

种公猪的科学饲养管理

<正>在规模化养猪生产中,一头种公猪要负担几十头或更多母猪的配种任务,因而种公猪繁殖性能的好坏,对整个母猪群的繁殖力影响很大。因此,必须加强种公猪的饲养管理,使种猪保持良好的体质以提供优质的精液,提高配种受胎率及窝产仔数。在我国目前的商品猪生产体系中,仍然以追求商品猪的生长速度和瘦肉率为主,使用的种公猪主     

巍山县猪人工授精工作存在的问题及建议

猪人工授精技术始于20世纪30年代,迄今为止已有80多年的应用历史.人工授精可以充分发挥优秀种公猪的遗传潜力,提高优秀种公猪的利用率,减少种公猪的饲养数量和饲养费用,提高商品猪的质量;克服公、母猪因体格差异所造成的配种困难,提高配种率及妊娠率;减少由于配种所带来的疾病传播,确保配种环节中的公猪精液质量;克服时间和区域的差异,实现适时配种.     

农村散户养猪人工授精效果观察

猪人工授精技术是人工方法采集公猪的精液，经过品质检查、稀释、保存等处理后，再将精液输入到发情母猪的生殖道内以达到受胎目的的配种方法。与自然交配相比，它具有提高优良公猪利用率和商品猪整齐度以及减少饲养公猪数量等优点。目前，猪人工授精技术在大中型猪场逐步普及，而在农村散养猪中使用的却很少。     

普及猪人工授精技术促进科学养猪

猪人工授精是指用人工辅助器械采集公猪精液,经过实验室检查、处理和保存,再用器械将公猪精液输入到发情母猪生殖道内的一种配种方法.此技术是以种猪的培育和商品猪的生产为目的,进行科学养猪,实现养猪生产现代化的重要手段.普及猪人工授精技术能有效解决农村散养母猪配种难、品种劣、疾病交叉感染的问题.     

北京猪人工授精技术推广11年成效分析

猪人工授精技术（AI）是以种猪的培育和商品猪的生产为目的而采用的最简单有效的配种方法,是进行科学养猪、实现养猪生产现代化的重要手段。1猪人工授精技术现实意义猪人工授精是指用器械采取公猪的精液,经过检查,处理和保存,再用器械将精液输入到发情母猪的生殖道内以代替自然交配的一种配种方法。在养猪生产中应用,它具备减少公猪的饲养数量、提高优秀公猪的配种效能、减少疾病的传播、克服体格大小的差别,充分利用杂种优势、可异地配种、减少劳动强度等优点。     

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.     

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.……     

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.     

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.