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1.
在青海环湖牧区放牧条件下 ,用边区莱斯特公羊与藏母羊杂交 ,杂种一代羔羊初生重、6月龄产毛量、周岁羊体重均呈明显杂种优势 ,产羔率、羔羊成活率、适应性良好。  相似文献   

2.
采用夏洛来公羊、萨福克公羊与藏母羊、青海半细毛母羊及青海细毛母羊杂交一次，利用杂交优势生产肥羔。试验结果表明：在相同的饲养管理和放牧条件下，夏洛来羊、萨福克羊的杂种后代平均初生重和６￣７月龄平均体重均高于当地同龄羔羊，平均日增重比同龄藏羊羔提高４０％￣４６％，比青海半细毛羔羊提高４２％，比青海细毛羔羊提高２１％；胴体平均重比以上三种羊提高３０％￣８０％；周岁母羊剪毛量比同龄藏母羊高１．０２￣１．３  相似文献   

3.
夏洛莱羊在内蒙古的繁育结果表明,母羊繁殖率、羔羊增重等主要指标都达到和超过原产地品种标准,在牧区放牧条件下,夏洛莱羊与蒙古羊的一代杂种羔羊6月龄胴体重为19.5 kg,比蒙古羊羔羊增加3.71 kg.用夏洛莱作杂交父本生产肉羔羊效果好,可广泛用于经济杂交生优质羔羊肉.  相似文献   

4.
根据羔羊早期生长发育快的特点，在每年秋冬将西部牧区不作繁殖用的羔羊贩运到东部农区，分适应期，放牧＋补饲，舍饲育肥三个阶段育肥１２０－１５０天，平均每只８月龄育羔胴体重为１８．１千克，与一般同龄羔羊相比，产肉率提高６１％，经济效益和社会效益显著。  相似文献   

5.
无角道赛特羊和特克塞尔羊与藏系羊杂交效果   总被引：1，自引：0，他引：1  
在高寒农区放牧加舍饲条件下,分别采用优良肉用无角道赛特、特克塞尔公羊与当地藏系羊杂交,利用杂交优势进行羔羊肉生产。道藏 F1和特藏 F1羔羊平均初生重分别为3.40 kg 和3.35 kg,3月龄重分别为11.45 kg 和12.32 kg,6月龄断奶重分别为28.24 kg 和27.67kg,6月龄羯羊胴体重分别为14.65 kg 和14.24kg,屠宰率分别为51.34%和51.1%,净肉率分别为76.45%和76.27%。两品种肉羊与当地藏系羊杂一代羔羊的肉用生产性能显著高于藏系羔羊(P<0.01)。  相似文献   

6.
在平安县南山草食畜商品经济开发区（６个乡）实施幼龄羊西繁东育育技术。秋冬季节将牧区的幼龄羊贩运到本地区，在农户饲养管理条件下，采用放牧＋补饲和舍饲育肥方式进行肥育。结果：育肥幼龄羔羊３５００只，８月龄平均胴体重１８．２ｋｇ，产肉率比对照羊提高６１．０９％，增加收入６０％以上，经济效益显著。  相似文献   

7.
为进一步研究不同肉羊品种与湖羊杂交F1代羔羊育肥效果,本试验选择国外优良的肉羊品种杜泊羊、无角陶赛特羊和萨福克羊作父本,国内优良地方品种湖羊作母本开展杂交试验研究,所获得的杂交F1代羔羊在全舍饲条件下进行育肥。测定杂交F1代羔羊初生重、不同月龄体重和平均日增重等生长性能。结果表明：试验A组（杜泊公羊与湖羊母羊杂交F1羔羊）、试验B组（无角陶赛特公羊与湖羊母羊杂交F1羔羊）、试验C组（萨福克公羊与湖羊母羊杂交F1羔羊）6月龄平均重分别为44.76±3.62 g、 43.65±4.18 g、43.28±3.34 g,均极显著高于对照组D 6月龄平均重36.32±3.86 g,差异极显著(P＜0.01)。试验A组、B组、C组与对照组D相比较,试验A组、B组、C组每只羊的利润较对照组分别多收入80.02元、69.74、42.74元,差异极显著（P＜0.01）,其中试验A组的生长性能和利润均优于试验B组和C组,差异显著(P＜0.05)。  相似文献   

8.
陶赛特羊与藏系羊杂交试验   总被引：3，自引：1，他引：2  
在高寒牧区天然草地的放牧条件下，采用优良肉用品种陶赛特公羊与当地藏系羊杂交，利用杂交优势进行羔羊肉生产。杂交一代羔羊平均初生重3.12kg，月龄重10.89kg,4月龄继奶重27.14kg，4月龄羯羔胴体重12.52kg，屠宰率46.14%，净肉率74.36%，羔羊的肉用生产性能显著高于当地藏系羔羊，在高寒牧区可以推广应用。  相似文献   

9.
1夏洛来羊原产于法国中部夏洛来丘陵地带,以产肉为主。夏洛来羊公母均无角,体躯圆桶形,后躯发育特别良好,成年公羊体重100～130kg,母羊体重60～80kg。初产母羊产羔率130%～140%,经产母羊产羔率180%～190%。在法国适宜草场放牧条件下,母羊产奶多,完全能带好双羔。羔羊生后至4月龄,日增重达250g,6月龄羔羊体重可达40～50kg,胴体重20～25kg。夏洛来羊是一个优良肉用种羊,饲养于河北、河南、内蒙古和新疆,表现出了良好的适应性。其采食速度快,不择食,放牧性很好。目前在辽宁省朝阳地区饲养较多,与当地绵羊杂交,杂交优势明显。2无角道赛特羊无角…  相似文献   

10.
无角陶赛特和萨福克羊在新疆的杂交利用研究   总被引：1，自引：0，他引：1  
１９８９年新疆从澳大利亚引进无角陶赛特和萨福克肉羊，在全区８个地州与当地棉羊进行了杂交试验。杂种后代具有明显的父本特征和杂交优势，２８５只羔羊屠宰结果表明，无角陶赛特或萨福克公羊与哈萨克羊、阿勒泰羊、蒙古羊、卡拉库尔羊、当地粗毛羊或低代细毛杂种羊的杂交后代，在相同的饲养管理条件下，４－６月龄屠宰前活重比对照组高３－８公手，胴体重高１－５公斤，净肉重高１－５公斤，尾脂重减少１－２公斤。一般４－６月龄  相似文献   

11.
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。  相似文献   

12.
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.  相似文献   

13.
Tropical Animal Health and Production -  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
<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.  相似文献   

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