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1.
将320只21日龄艾维因肉鸡随机分为5个CO2浓度组(3 000 mg/m35、000 mg/m38、000 mg/m3、12 000 mg/m31、5 000 mg/m3),分别饲养在结构一致的自制环控塑料棚舍内。研究不同CO2浓度对肉鸡血液中免疫球蛋白及其它血液生化指标的影响。鸡舍内CO2浓度为5 000 mg/m3时,免疫球蛋白高于其它组(P>0.05);而当鸡舍内CO2浓度升高到12000 mg/m3时,免疫球蛋白呈下降趋势,血液中白细胞数量、血红蛋白含量和平均血红蛋白含量显著高于其它组(P<0.05),而死亡率比对照组高150.32%(P<0.05)。说明鸡舍内CO2浓度为5 000 mg/m3时,可提高肉鸡特异性免疫;当鸡舍内CO2浓度升高到12 000 mg/m3时,肉鸡正处于一种应激状态,不利于肉鸡健康。 相似文献
2.
《饲料研究》2014,(15)
选用240只1日龄健康的AA商品代肉鸡雏,随机分为4个处理,每处理3个重复,每重复20只鸡。试验1组,饲喂基础日粮;试验2组~试验4组,在基础饲粮中依次添加2 g/kg的酸化剂、120 mg/kg的丝兰提取物及2 g/kg的酸化剂+120 mg/kg的丝兰提取物,研究丝兰提取物和酸化剂合用对肉鸡生产性能及鸡舍有害气体质量浓度的影响。试验结果表明:试验2组、试验3组和试验4组的终质量、平均日增质量、料重比和病死率与试验1组差异显著(P0.05);试验2组、试验3组和试验4组的鸡舍内的NH3含量与试验1组差异极显著(P0.01)。试验2组与试验3组和试验4组鸡舍内的NH3含量差异显著(P0.05);试验2组、试验3组和试验4组的鸡舍内的H2S含量与试验1组差异显著(P0.05)。在肉鸡日粮中添加丝兰提取物和酸化剂,能够提高肉鸡的生产性能,减少肉鸡的病死率;显著地降低鸡舍内NH3和H2S的质量浓度(P0.05),改善鸡舍内的空气状况,减少畜牧业对环境的污染。 相似文献
3.
《畜牧与兽医》2014,(9):44-47
将3 200只健康的1日龄AA商品代肉鸡随机分成4个处理。在各组饲粮中分别添加不同水平的丝兰提取物,研究其对肉鸡饲粮养分利用率及鸡舍有害气体浓度的影响。结果表明:试验3、4组的终重、平均日增重、料重比与试验1组差异显著(P<0.05),试验3、4组的代谢能及粗蛋白利用率与试验1组差异显著(P<0.05),试验2、3、4组鸡舍内的NH3的含量与试验1组差异极显著(P<0.01),试验2、3、4组鸡舍内的H2S的含量与试验1组差异显著(P<0.05)。在肉鸡饲粮中添加不同水平的丝兰提取物,可以加快肉鸡的生长速度,提高肉鸡饲粮养分利用率,改善了鸡舍内的空气状况。 相似文献
4.
试验旨在探讨饲养密度对黄羽肉鸡舍内有害气体、粉尘及微生物的影响.选用1 440只21日龄苏禽黄鸡(公雏),随机分成3个饲养密度组,即8只/m2组(低密度组,LSD)、16只/m2组(中密度组,MSD)、24只/m2组(高密度组,HSD),每组3个重复,共9间鸡舍,每间饲养面积均为10 m2.试验期为21 d.结果表明:HSD组42日龄肉鸡鸡舍内二氧化碳、氨气含量显著高于其他两组(P＜0.05);LSD组28日龄肉鸡鸡舍内粉尘含显著低于其他两组(P＜0.05);LSD组28、35、42日龄肉鸡鸡舍内空气中大肠杆菌的含量显著高于其他两组(P＜0.05),且LSD组42日龄肉鸡鸡舍垫料中大肠杆菌含量显著高于HSD (P＜0.05).由此可知,夏季适当降低饲养密度可以改善平养肉鸡舍中有害气体和粉尘状况,但对降低鸡舍中微生物含量效果不佳. 相似文献
5.
《动物营养学报》2021,33(7)
本试验旨在研究大蒜粉对肉鸡生长性能、抗氧化能力、免疫力和肠道形态的影响。选取480羽体重相近、健康状况良好的1日龄白羽肉鸡,随机分成4组,每组8个重复,每个重复15羽,进行为期42 d的饲养试验。对照组饲喂基础饲粮,抗生素组饲喂基础饲粮+75 mg/kg金霉素,2个大蒜粉组分别饲喂基础饲粮+1 000 mg/kg大蒜粉(1 000 mg/kg大蒜粉组)、基础饲粮+2 000 mg/kg大蒜粉(2 000 mg/kg大蒜粉组)。结果表明:1)与对照组相比,饲粮中添加1 000 mg/kg大蒜粉可显著提高1～42日龄肉鸡的平均日增重(P 0.05),添加1 000和2 000 mg/kg大蒜粉可显著降低1～21日龄肉鸡的料重比(P0.05);2)与对照组和抗生素组比,饲粮中添加1 000和2 000 mg/kg大蒜粉均可显著提高肉鸡血清免疫球蛋白A(IgA)、免疫球蛋白Y(IgY)、免疫球蛋白M(IgM)含量(P0.05),显著降低血清肿瘤坏死因子-α(TNF-α)含量(P0.05),且大蒜粉组血清白细胞介素-1β(IL-1β)含量显著低于抗生素组(P 0.05);3)2 000 mg/kg大蒜粉组血清谷胱甘肽过氧化物酶(GSH-Px)活性显著高于对照组(P0.05);4)与对照组相比,饲粮中添加1 000 mg/kg大蒜粉可显著提高肉鸡21日龄绒毛高度,添加1 000和2 000 mg/kg大蒜粉均可显著降低42日龄肉鸡隐窝深度(P0.05),并可显著提高绒毛高度/隐窝深度(V/C)(P0.05);5)与对照组相比,饲粮中添加1 000和2 000 mg/kg大蒜粉均可显著降低回肠黏膜Toll样受体2(TLR2)的相对表达量(P0.05)。综上可知,饲粮中添加大蒜粉能促进肉鸡生长,调节机体免疫力,促进肠道发育,减少炎症反应。本试验中,肉鸡饲粮中大蒜粉的最佳添加量为1 000 mg/kg。 相似文献
6.
试验旨在研究日粮中添加双歧杆菌对肉鸡生长性能、血清生化指标及肠道功能的影响。选取10 000只AA肉鸡随机分为4组,每组5个重复,每个重复500只鸡。对照组肉鸡饲喂基础日粮,试验组分别在基础日粮中添加500、750、1 000 mg/kg双歧杆菌。试验期42 d。结果显示,1～42 d,750 mg/kg组、1 000 mg/kg组肉鸡的平均日增重显著高于对照组,料重比显著低于对照组（P<0.05）。1 000 mg/kg组肉鸡血清免疫球蛋白A (IgA)和免疫球蛋白M (IgM)含量显著高于对照组（P<0.05）,血清白细胞介素-1 (IL-1)含量显著低于对照组（P<0.05）。750 mg/kg组肉鸡血清白细胞介素-10 (IL-10)含量显著低于对照组（P<0.05）。1 000 mg/kg组肉鸡血清总抗氧化能力（T-AOC）显著高于对照组（P<0.05）。各试验组肉鸡血清超氧化物歧化酶（SOD）活性显著高于对照组（P<0.05）。750 mg/kg组、1 000 mg/kg组肉鸡血清丙二醛（MDA）含量显著低于对照组（P<0.05）。... 相似文献
7.
本试验旨在研究断奶仔猪暴露于不同浓度、不同时长氨气中对生长性能、免疫及抗氧化性能的影响。选取36头初始体重为(10.70±2.10)kg的健康断奶仔猪,随机分为4组,每组3个重复,分别饲养在4个密闭的环境控制仓内,对照组氨气浓度为0 mg/m~3,各试验组氨气浓度分别为25、35、45 mg/m~3。试验期15 d。试验期间记录生产性能,每隔5 d进行前腔静脉采血,测定血液生化指标、免疫细胞因子和抗氧化酶活性。结果表明：不同氨气浓度对断奶仔猪平均日增重、平均日采食、耗料增重比无显著影响。氨气暴露5 d,与对照组相比,各试验组断奶仔猪血液中过氧化氢酶、总抗氧化酶活性降低(P<0.05);各试验组免疫球蛋白G含量降低(P<0.05),血液中白介素2和免疫球蛋白M含量在45 mg/m~3氨气组下降(P<0.05);35和45 mg/m~3氨气浓度组免疫球蛋白A含量低于25 mg/m~3浓度组(P<0.05)。暴露10 d,与对照组相比,各试验组血清免疫球蛋白G含量降低(P<0.05),氨气浓度为45 mg/m~3组仔猪血清谷丙转氨酶含量提高(P<0.05)... 相似文献
8.
为明确氯化稀土对延边黄牛瘤胃微生物体外发酵的影响,试验在高精料日粮条件下(73),利用体外静态模拟发酵法,设计了0、500、1000和2000mg/kg 4个氯化稀土添加剂量组,经过恒温培养箱39℃培养12 h,在设定的时间内测定pH值、气体(气体总量、H2、CH4、CO2)产量、氨氮浓度(NH3-N)及挥发性脂肪酸(VFA)浓度。试验结果表明,氯化稀土添加量在设定范围内,对pH值无显著影响(P>0.05);产气量随发酵时间的延长而逐渐增加,其中500mg/kg组显著高于对照组(P<0.05);氯化稀土提高了CO2产量,3 h时500mg/kg处理组与对照组相比差异显著(P<0.05),12 h时1 000mg/kg处理组与对照组相比差异显著(P<0.05);同时氯化稀土提高了H2产量,9~12 h时500mg/kg处理组与对照组相比差异显著(P<0.05),12 h时2 000mg/kg处理组与对照组相比差异显著(P<0.05)。氯化稀土在一定添加量范围内能够降低瘤胃液中氨氮浓度,其中6~12 h时间段500、1 000mg/kg处理组与对照组相比显著降低(P<0.05),其余各组无显著变化(P>0.05);TVFA、乙酸含量在3 h时2 000mg/kg处理组显著高于对照组(P<0.05),12 h时氯化稀土处理组显著高于对照组(P<0.05),丙酸、丁酸无显著影响(P>0.05),氯化稀土提高了VFA中乙酸/丙酸的比值,在12 h时,1 000、2 000mg/kg处理组与对照组相比差异显著(P<0.05)。研究初步表明,氯化稀土可以在一定程度上提高延边黄牛的瘤胃微生物发酵功能,并以1 000mg/kg添加量较为适宜。 相似文献
9.
选用21日龄AA肉仔鸡3 000羽,随机分成3组,每组5个重复,每个重复200只。第1组为对照组,饲喂基础日粮;第2、3组为试验组,分别在基础日粮中添加0.1%、0.2%的益生素,以研究益生素对肉鸡生产性能及鸡舍空气质量的影响。结果:日粮中添加益生素的试验2组、3组的终重、耗料量、料重比与对照组差异显著(P<0.05);各组屠宰率差异不显著(P>0.05)。试验组鸡舍内的NH3含量明显低于对照组,差异极显著(P<0.01);H2S含量与对照组差异显著(P<0.05);各组鸡舍内CO2的含量无明显差异。表明益生素能提高肉鸡的生长速度,降低料重比,但对肉鸡的屠宰率影响不明显,同时还可改善舍内空气质量,减少环境污染。 相似文献
10.
为了研究微生态制剂对笼养蛋鸡舍内空气质量的影响,试验选择300日龄海兰褐蛋鸡24 000只,随机分为2组,每组12 000只,每组设4个重复,每个重复3 000只,对照组按常规饲喂基础日粮,试验组在基础日粮中添加产酶益生素、肽菌素各1‰,并且每周用微生态制剂进行鸡舍的喷雾净化,测定鸡舍空气中NH3、CO2含量和粉尘含量。结果表明:试验组鸡舍内NH3、CO2含量均显著低于对照组(P0.05),1.0μm以上粒径粉尘含量试验组显著低于对照组(P0.05)。说明微生态制剂对鸡舍空气质量改善有一定的促进作用,值得进一步推广。 相似文献
11.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(9):347-350
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12.
Heartworm in dogs in Canada in 1982 总被引：8，自引：8，他引：0
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1983,24(7):227-229
13.
Owen J Slocombe D McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(9):324-328
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14.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(6):504-508
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
15.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1985,26(10):323-327
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16.
17.
Slocombe JO Villeneuve A 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(10):630-633
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
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.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(8):641-646
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.
Owen J Slocombe D McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1987,28(8):491-495
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