早期诊断与干预可减少妊娠母猪跛行的发生

母猪跛行不仅能引起疼痛,也影响着母猪的繁殖、运动、采食和淘汰率。目前对跛行早期检查与预防措施的研究较少,但这些措施可提高母猪的整体健康程度、动物福利以及其生产性能。蹄壳相关疾病是导致跛行最重要的因素之一。     

非遗传因素对母猪繁殖性能的影响分析

现代养猪生产的经济效益的好坏在很大程度上取决于母猪繁殖性能的优劣,母猪繁殖性状多为低遗传力性状,因而探讨非遗传因素对繁殖性能的影响对改善母猪繁殖性能具有积极意义。文章从胎次、日粮营养、输精方式、初配日龄、饲养管理、母猪背膘厚以及环境等非遗传因素对母猪繁殖性能的影响展开综述,通过分析各非遗传因素对母猪繁殖性能的影响,旨在为实际生产中改善母猪繁殖性能提供可靠理论依据。     

美纤多(MEXIDO)在母猪膳食中的应用

美纤多(MEXIDO)作为一种母猪膳食纤维,对改善母猪的消化道功能、提高能量代谢和营养物质吸收,增强母猪繁殖性能和后代仔猪生长性能,以及对母猪福利和生猪养殖环境都有重要影响。     

母猪繁殖性能影响因素及建议

母猪繁殖性能直接决定了养猪业的生产效益,提高母猪有效的繁殖性能可显著提升猪场经济效益。母猪的繁殖性能由多因素影响制约,文中着重探究母猪非遗传力因素对母猪繁殖性能的影响进行分析与建议,如胎次、非生产天数、背膘厚、季节、生物安全5个因素,以期给广大猪场在提高母猪繁殖性能上提供可行性的参考。     

非遗传因素对母猪繁殖性能影响的研究进展

母猪的繁殖性能对养猪生产效益具有重大影响。母猪的繁殖性状属于低遗传力性状,其性能的优劣受外界因素的影响较大。胎次、配种季节和分娩季节、营养水平、环境(高温、光照等)以及饲养管理等非遗传因素对母猪繁殖性能具有重大的影响。笔者就国内外对影响母猪繁殖性能的非遗传因素的研究加以综述,阐述非遗传因素对母猪繁殖性能的影响,旨在为提高母猪的繁殖性能提供思路和依据,进而改善养猪生产的效益。     

日粮纤维在繁殖母猪生产中的重要作用(续1)

日粮纤维对母猪的行为、动物福利、免疫状态、氮排放量和繁殖性能具有一定的的影响。在母猪生产周期的不同阶段,如妊娠期、哺乳期,给其饲喂不同来源的纤维,会对母猪繁殖性能和所产仔猪的生产性能产生不同的影响,如果处理得当,猪场可从中获益。     

妊娠母猪的流产原因与保胎要点

繁殖母猪是猪场的"摇钱树",流产是制约母猪高效繁殖的重要因素,只有摸清母猪流产的传染性因素与非传染性因素的原因及采取应对措施,才能为降低母猪流产率提供准确指导。同时,提高繁殖母猪的福利水平,也将为猪场经营者带来更高的利益回报。     

非遗传因素对母猪繁殖性能的影响

母猪的繁殖性能决定养殖场的生猪繁殖。以往研究主要集中在遗传因素对母猪的繁殖性影响,但是一些非遗传因素同样会对母猪的繁殖性能造成影响,例如养殖方式、母猪的胎次等。     

提高农村中小猪场母猪繁殖性能的对策

母猪的繁殖性能是影响猪场经济效益的直接原因,尤其是中小猪场母猪的繁殖性能是决定猪场生存的关键因素,因此,提高中小猪场母猪的繁殖性能十分有必要。影响母猪的繁殖能力的因素包括遗传因素和环境因素等,本文通过对影响母猪繁殖性能的原因进行分析,进一步提出提高母猪繁殖性能的对策,旨在为农村中小猪场提高经济效益提供一定帮助。     

影响母猪繁殖性能的营养因素及其调控

<正>养猪生产效率与经济效益深受母猪繁殖效率影响,且遗传、疾病、环境、饲养管理、营养水平等均可能对母猪繁殖性能产生影响。因此,为提高养猪生产效率和经济效益,养猪户应分析影响母猪繁殖性能的因素,并采取预防措施。笔者以影响母猪繁殖性能的营养因素为出发点,提出相应的调控措施。1营养对母猪繁殖性能的影响分析繁殖过程中,起主要作用的是促黄体素(LH)     

Heartworm in dogs in Canada in 1984

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.

     

Heartworm in dogs in Canada in 1983

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.

     

Heartworm in dogs in Canada in 1991

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.     

Heartworm in dogs in Canada in 1985

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.

     

Heartworm in dogs in Canada in 1988

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%).     

Heartworm in dogs in Canada in 1989

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.

     

Heartworm in dogs in Canada in 1987

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%).     

Heartworm in dogs in Canada in 1986

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.