如何促进我国肉牛产业的健康发展

肉牛产业（Beef Industry）是以牛属动物的肉作为原料，经过加工以满足人类需求的产业。西方国家由于草地或粮食资源较丰富，他们在将牛属动物作乳用和役用之外，还发展了以肉用为目的的养牛业。我国由于人多地少，牛属动物主要用作役用和乳用。正如一位外国学者说：“80年代之前，中国没有真正的肉牛业”。这位学者在解释什么是肉牛业时说：所谓肉牛业是指牛属动物，     

中国肉牛生产、贸易和需求现状及预测

1中国肉牛养殖发展历程 目前,中国肉牛养殖大致经历了三个发展阶段:第一阶段:发展初期(1980-1990年)中国的牛以役用为主.当时农业机械紧缺,役用牛是主要的耕畜,政府规定严禁屠杀能繁母牛、种牛和青年牛,同时肉牛养殖也受到重视,国家开始投资建设肉牛生产基地,逐渐形成了以饲养役用牛为主,肉用牛为辅的生产格局;第二阶段:快速发展期(1991-2006年)国家相继出台了对肉牛养殖业扶持的各种政策,"秸秆养畜"项目在农村迅速发展,使得这一阶段肉牛出栏数快速提高.     

江西省肉牛生产效率及其影响因素研究——基于SDEA-Tobit模型

本文基于2011～2020年江西省各地级市肉牛生产的投入产出面板数据，运用SDEA-Tobit模型对肉牛生产效率及其影响因素进行分析。研究表明：时间上，江西省肉牛生产效率均值从0.41提高到0.89，发展态势良好，但仍有进步空间。空间上，全省呈现“南北弱、东中西强”的空间布局，宜春、新余、吉安及景德镇的肉牛生产居全省前列，赣州和九江肉牛生产效率较低。农村居民人均可支配收入、农林水支出、粮食播种面积、人口城镇化水平和商品零售价格指数对江西省肉牛生产效率呈显著正向影响。据此，提出注重科技创新与推广，依据本地特色探索肉牛发展新模式及加大肉牛生产扶持力度的建议。     

中加肉牛产业联盟常务副理事长、中国农业大学教授 孟庆翔:中国肉牛业发展六道枷锁——种养病人管销

正中国农业大学肉牛研究中心、中法肉牛研究中心、中加肉牛产业合作联盟分别于2003年2月、2005年12月、2017年6月成立,在孟庆翔教授带领下,开展了大量基础性卓有成效的工作,奠定了我国肉牛研究及产业发展的基础。新时代开启了中国肉牛发展新一轮的时期,我国肉牛产业不仅面临巨大机遇,同时也存在很大挑战。肉牛主产区地方政府、肉牛育肥企业、屠宰加工企业对中国肉牛产业未来的发展存在诸多分歧,中国肉牛界资深专     

中国肉牛业现状和发展对策

本文介绍了中国肉牛业的现状，分析了中国肉牛业生产中存在的3个方面的问题，提出了中国肉牛业发展的5个对策，即继续开展肉牛改良，加快肉牛良种培育和扩繁；提高肉牛饲养管理水平，促进优质肉牛生产；提高牛肉产品质量；实现产业化生产；实施牛肉品牌战略。     

节粮型畜牧业有前途

2011年12月21日，农业部印发了《全国节粮型畜牧业规划2011-2020年》，提出未来5～10年发展牛、羊、兔等节粮型畜牧业的规划。规划中的节粮型畜牧业，是指充分利用牧草、农副产品、轻工副产品等非粮饲料资源，在减少粮食消耗的同时达到高效畜产品产出的畜牧产业，主要包括奶牛、肉牛、肉羊、绒毛羊、兔和鹅等。     

肉牛养殖场粪污综合治理技术探索

丰都县自2008年打造中国南方肉牛之都以来，肉牛产业得到快速发展，但肉牛养殖场粪便排放造成的环境污染问题也日益突出。随着人们环保意识的增强，肉牛养殖场粪便污染问题必须加以综合治理。     

泾源县肉牛养殖业现状问题及对策

草畜产业是宁夏农业优势特色产业之一,自治区提出建设以泾源县为核心区的"环六盘山清真肉牛产业带",先后实施了"两轮"肉牛产业项目,极大的助推了泾源肉牛养殖业快速发展。经过6年连续发展,肉牛养殖业已成为全县农民增收,带动地方经济可持续发展的主导产业。同时,泾源县肉牛产业发展成功经验,被自治区农牧厅总结形成了"泾源肉牛发展模式",在全区进行推广。     

其他

中国粮食生产可望连续6年增产引起世界瞩目 农业部部长孙政才日前表示，中国今年粮食生产大局已定．预计全年粮食产量将再创历史新高．实现近40年来首次连续6年增产。     

第四届(2017)中国肉牛选育改良与产业发展国际研讨会邀请函

正尊敬的同行专家及业界同仁:为了促进中国黄牛肉用选育改良和肉牛产业发展,交流国内外养牛先进技术,促进我国肉牛产业转型升级,经教育部批准,西北农林科技大学、国家肉牛改良中心将于2017年11月28-30日在陕西杨凌举办"第四届(2017)中国肉牛选育改良与产业发展国际研讨会"。现将有关事项通知如下:会议主题:加强中国黄牛选育改良,促进现代肉牛产业发展。主要议题:(1)中国黄牛肉用遗传改良及种质创新;(2)肉牛高效繁育体系及运行模式创立;(3)肉牛健康     

白术、微米白术和白术多糖对断奶仔猪生长性能和肠道形态及微生态区系的影响

试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。     

Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia

Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal (GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April 2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes. But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia.     

Internal Parasites and Haematological Values in Cattle Slaughtered in Buea Subdivision of Cameroon

Tropical Animal Health and Production -     

Phase I evaluation of CCNU (lomustine) in tumor-bearing cats

1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.     

Chemotaxis of macrophage in inflammation

Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.     

Prevalence of gastric lesions in racing Alaskan sled dogs

Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.     

Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects

Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.     

Y‐chromosomal variation of local goat breeds of Turkey close to the domestication centre

Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded.     

Changes in proportion of canine urinary calculi composed of calcium oxalate or struvite in specimens analyzed from 1981 through 2001

The objective of this report was to characterize 20-year changes in proportion of calcium oxalate (CaOx) calculi and struvite calculi in dogs, and associations with breed, age, and sex. In this retrospective study, results of analysis of urinary calculi from dogs were reviewed for specimens received between July 1, 1981, and December 31, 2001. Breed, sex, age, year of submission of the specimen, and mineral type(s) were analyzed statistically. CaOx or Struvite or both were contained in 18,966 of 20,884 (91%) specimens. For both sexes, a 20-year statistically significant increase was observed in the proportion of calculus specimens that contained CaOx. The increase in this proportion was greater in females (1% to 31%) than in males (18% to 82%). From 1998 to 2001, when proportions may have plateaued, the odds of specimens containing CaOx were markedly higher in 18 breeds, markedly lower in 5 breeds, and not significantly different in 13 breeds compared with crossbreds. For both sexes, a 20-year statistically significant decrease was observed in the proportion of calculus specimens that contained struvite. This decrease in proportion was greater for males (79-16%) than for females (97-68%). From 1998 to 2001, when proportions plateaued, the odds of calculi containing struvite were markedly lower in 20 breeds, markedly higher in 1 breed, and not significantly different in 15 breeds when compared with crossbreds. Breed, age, and sex were associated statistically with CaOx or struvite urolithiasis. In conclusion, there appears to have been a long-term increase in the proportion of specimens of canine urinary calculi that contain CaOx as well as a long-term decrease in the proportion of specimens of calculi that contain struvite for both male and female dogs. The rate of change appeared to begin leveling off in the period 1998 to 2001. The recent proportion of dogs with either CaOx- or struvite-associated urolithiasis may depend on breed, age, and sex, and on interactions among these 3 factors.     

Smart Phone Assisted City-scale Wireless Sensor Network Deployment for Transportation System Monitoring

<正>1.INTRODUCTION Ensuring transportation network security is one Of the most daunting challenges confronting homeland security agencies today.Significant research has been dedicated.To model and analyze the vulnerability of transportation systems,while notably fewer studies propose specific strategies for deploying defensive technologies to safeguard these systems.