共查询到20条相似文献，搜索用时 62 毫秒
1.
选择８头处于泌乳中期的荷斯坦泌乳牛，采用配对分组法，分为对照组和试验组，每组４头，对照组饲喂基础日粮，试验组在基础日粮中添加占精料量０．８％的硫酸钠，经４０天的试验，结果表明：试验组比对照组头均每天多产奶１．０７ｋｇ，产奶量提高 ７．１％，差异显著（Ｐ＜０．０５）。试验期内试验组比对照组牛头均每天增收 １．５１元。 相似文献
2.
选择8头处于泌乳中期的荷斯坦泌乳牛，采用配对分组法，分为对照组和试验组，每组4头，对照组饲喂基础日粮，试验组在基础日粮中添加占精料量0．8％的硫酸钠，经40天的试验，结果表明：试验组比对照组头均每天多产奶1.07kg，产奶量提高7．1％，差异显著（P＜0．05）。试验期内试验组比对照组牛头均每天增收1．51元。 相似文献
3.
选择10头泌乳中期的中国荷斯坦泌乳牛，采用配对分组的方法，分为对照组和试验组，每组5头。对照组饲喂基础日粮，试验组在基础日粮中添加占精料量1％的复合预混料，经35d的试验，结果表明：试验组牛平均每头每天比对照组多产奶2．1kg，产奶量提高14．6％，差异极显著(P＜0．01)，试验组牛均每天增收3．07元，经济效益显著。 相似文献
4.
选择30头18月龄的西门塔尔牛×本地黄牛的杂种一代阉牛,随机分为试验组和对照组,每组15头。对照组饲喂基础日粮,试验组在基础日粮中添加0．2％复合酶制剂,育肥91d,结果表明;对照组与试验组牛头均分别增重62．70kg,84．80kg,两组差异极显著（P〈0．01）,试验组较对照组头均多增重22．1kg,头均每天可增收2．39元,经济效益显著。 相似文献
5.
选择8头处于泌乳中期的荷斯坦泌乳牛,采用配对分组法,分为对照组和试验组,每组4头,对照组饲喂基础日粮,试验组在基础日粮中添加占精料量0.8%的硫酸钠,经40天的试验,结果表明:试验组比对照组头均每天多产奶1.07kg,产奶量提高7.1%,差异显著(P<0.05)。试验期内试验组比对照组牛头均每天增收1.51元。 相似文献
6.
选择8头处于泌乳中期的荷斯坦泌乳牛,采用配对分组法,分为对照组和试验组,每组4头,对照组饲喂基础日粮,试验组在基础日粮中添加占精料量0.8%的硫酸钠,经40d的试验,结果表明:试验组比对照组头均每d多产奶1.07kg,产奶量提高7.1%,差异显著(P<0.05)。试验期内试验组比对照组牛头均每d增收1.51元。 相似文献
7.
选择８头育肥牛随机分为两组，第组４头（３♀，１♂），试验组日粮中添加５０％的ＥＭ发酵饲料，对照组饲喂基础日粮。经５０ｄ试验，结果表明：试验组和对照组牛平均每头增重分别为３８．６３ｋｇ和３２．８１ｋｇ，试验组比对照组头均多增重５．８２ｋｇ，差异显著（Ｐ〈０．０５）。 相似文献
8.
选择20头中国荷斯坦奶牛随机分为两组，每组10头。试验组牛每头每日在日粮中添加50g碳酸氢钠，对照组牛不添加，只喂基础日粮。结果表明：试验组奶牛比对照组奶牛的产奶量提高1．69kg，差异显著（P〈0．05）。说明碳酸氢钠能提高饲料转化率，增加产奶量。 相似文献
9.
选用平均体重10．4kg断奶后仔猪大白120头，长大二元60头，长白20头，共200头。按品种、体重、性别等随机分为2组，每组100头，两组各项指标差异不显著。试验期30天，Ⅰ组为对照组，Ⅱ组为试验组，饲喂基础日粮＋0．2％生物活性添加剂。生物活性添加剂组仔猪日增重比对照组提高27．1％，差异显著；料肉比试验组比对照组下降了11．63％；试验比对照组腹泻频率下降了84．97％。显示生物活性添加剂有较好的促生长预防腹泻的作用。 相似文献
10.
试验采用出生日期、体重基本一致的杜长大三元杂交断奶仔猪54头，随机分为两组，分设试验组和对照组，分三栏饲养，每栏9头，每组三个重复，在基础日粮相不同添加抗菌促生长剂的情况下，试验组添加1‰的盛肥速速是微生态制剂，结果表明试验组与对照组日增重分别为778g和687g，提高13．24％，差异显著（P＜0．05），试验组与对照组料肉比分别为2．47和2．71，试验组比对照组降低8．85％，差异显著（P＜0．01）。经济效益分析试验组比对照组可增收22．1元／头，试验证明，日粮添加盛肥速得可显著提高生长猪的生产性能和经济效益。 相似文献
11.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
13.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
15.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium. 相似文献
16.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
17.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
18.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
19.
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
20.
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%). Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada. 相似文献
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