麦洼牦牛选育情况调查

以麦洼牦牛原种场建设为重点，组建选育核心群和扩繁群，对麦洼牦牛进行选育，提纯复壮。通过5年的艰苦工作，选育核心群一世代牛：1岁公母牛体尺体重达到1．5岁一级品种标准；2岁公母牛体尺体重达到2．5岁一级品种标准；3岁公母牛体尺体重达到2．5岁特级品种标准。选育效果非常显著。     

湖羊保种性选育初报

多胎和特殊羔皮花纹是湖羊主要的品种特点之一,为维持和提高这两个性状,分别组建了多羔和羔皮保种性选育核心群,经过3个世代封闭纯繁选育,初步形成了以第2胎为主、4个公羊家系、10头公羊和38头基础母羊组成的多羔系,16头公羊和55头基础母羊组成的羔皮系纯繁选育核心群。多羔系核心群平均同胞数3．2头,公、母羊平均初生重分别为3．13kg和2．71kg;选育群平均产羔头数由第1世代的3．00头增加到第3世代的3．60头,3个世代平均选育进展为0．30头。羔皮系核心群特级羔皮公、母羊比例分别为87．50％和76．36％,一级羔皮公、母羊比例分别为12．50％和23．64％,公、母羊平均初生重分别为3．50kg和2．94kg,群体平均同胞数为2．08头;选育群特级羔皮公、母羊比例分别由第1世代的45．45％和50．00％增加到第3世代的84．62％和72．73％,公母羊平均选育进展分别为19．59％和11．37％。获得了较好的保种选育效果,为湖羊优良种质资源保护贡献了力量。     

湖羊保种性选育初报

多胎和特殊羔皮花纹是湖羊主要的品种特点之一,为维持和提高这两个性状,分别组建了多羔和羔皮保种性选育核心群,经过3个世代封闭纯繁选育,初步形成了以第2胎为主、4个公羊家系、10头公羊和38头基础母羊组成的多羔系,16头公羊和55头基础母羊组成的羔皮系纯繁选育核心群。多羔系核心群平均同胞数3．2头,公、母羊平均初生重分别为3．13kg和2．71kg;选育群平均产羔头数由第1世代的3．00头增加到第3世代的3．60头,3个世代平均选育进展为0．30头。羔皮系核心群特级羔皮公、母羊比例分别为87．50％和76．36％,一级羔皮公、母羊比例分别为12．50％和23．64％,公、母羊平均初生重分别为3．50kg和2．94kg,群体平均同胞数为2．08头;选育群特级羔皮公、母羊比例分别由第1世代的45．45％和50．00％增加到第3世代的84．62％和72．73％,公母羊平均选育进展分别为19．59％和11．37％。获得了较好的保种选育效果,为湖羊优良种质资源保护贡献了力量。     

辽宁黑猪瘦肉系选育进展初报

辽宁黑猪两次导入杜洛克血缘，采用群体继代选育法，进行辽宁黑猪瘦肉系选育，历时3年完成了0-2世代的选育。选育群种猪活重达90kg的日龄为143天．料重比为2．96；胴体瘦肉率为63．09％，肌内脂肪含量为4．11％，肉质良好；母猪产仔数为12．80头，35日龄断奶窝重为124．61kg，全面达到了预期技术经济指标。     

新美系大白猪测定选育报告

新美系大白猪测定选育。2003年组建基础群，经过三个世代的选育测定，其主要经济性状达到和超过保种选育指标。公猪30～100kg日增重达到936g，母猪912g；100kg体重背膘厚，公猪10．6mm，母猪11．5mn2，生长到100kg体重日龄公猪152d，母猪157d，饲料报酬为2．6：1，公猪屠宰率为70．3％，眼肌面积46．57％，瘦肉率66．85％；母猪屠宰率为71．5％，眼肌面积48．6％，瘦肉率67．32％。母猪初产仔猪10．3头，二胎为11．5头，经产为12．6头，猪群氟烷基因阳性率为2．03％。开展杂交利用效果好。且将种猪推广到全国20几个省市的218个种猪场，社会效益和经济效益显著。     

提高新泰大黑山羊绒产量和质量的措施

为恢复和保留新泰大黑山羊适应性强、产绒多、肉质好的特点，我们干1990年开始，对地方良种新泰大黑山羊进行有计划地选育，组建了有种群，使优秀个体保留下来作母本；同时引进辽宁白绒山羊诈父本，开展黑、白绒山羊杂交改良提高了羊绒产量和质量．l材料与方法1．1育种群：选育理想个体．组建新泰大黑山羊育种群，共三群10O0只。1．2引进羊与当地羊：1991年和1994年两次从辽宁省盖县引进辽宁白城山羊60只，其中公羊40只、母羊20只：在石茶等乡镇先选200只新泰大黑山羊母羊作试验。1．3同养管理：种羊投放到农户，签订合同，登记造册．群体…     

甘加型藏羊选育效果浅析

甘加型藏羊本品种选育核心群公母羔平均初生重为4.15＋0.59kg和4．02＋0．53kg;3月龄公羔体重、体高、体长、胸围同比未选育群3月龄公羔分别提高4．42kg、4．34cm、5．05cm和5．98cm,3月龄母羔体重、体高、体长、胸围同比未选育群3月龄母羔分别提高2．37kg、5,1cm、5．17cm和4．77cm,均差异极显著（P〈0．01）。6月龄公羔同比未选育群6月龄公羔体重提高2．98kg差异极显著（P〈0．01）,6月龄母羔同比未选育群6月龄母羔体重提高3．64kg差异极显著（P〈0．01）。选育核心群18月龄公羊同比对照18月龄公羊体重提高6.18kg,剪毛量提高0．06kg差异不显著（P〉0．05）;18月龄母羊同比对照体重提高5．26kg差异极显著（P〈0．01）,剪毛量提高0．15kg差异显著（P〈0.05）。经过三年的严格选育,核心群的羊只结构有了显著变化,种公羊和适龄母羊的比例更加合理,适龄母羊优秀个体比例显著提高,其中特级提高了4．7个百分点,一级提高了10、7个百分点。     

中国西门塔尔牛草原类群培育方法

一、中国西门塔尔牛草原类群的选育方法及步骤１．选育方法：在同质选配自群扩繁的同时，采用开放式的核心群西门塔尔牛与多品系的优良公牛级进杂交，扩群为辅，以纯种扩繁为主的繁育方法。其模式为：利用西门塔尔公牛与蒙古牛，包括三蒙杂种牛（三河牛×蒙古牛）杂交。在级进杂交后选择理想型扩群繁育。２．育种步骤：中国西门塔尔牛草原类群选育早在５０年代开始，历时４０多年，经过引种（１９５８～１９８２年）、提纯复壮（１９８３～１９９０年）、选育提高（１９９１～２０００年）三个阶段培育而成。二、选育成果截至２０００年６月…     

甘肃黑猪瘦肉型Ⅰ系选育试验研究

以原甘肃黑猪为材料，采用继代选育方法，通过组建基础群，综合选择指数选择，参考同胞性能等技术措施，经５个世代选育，瘦肉率由５０．９０％提高到５４．６２％，并通过选种使繁殖性能有一定改进。     

澳洲荷斯坦牛选育效果初报

通过对澳洲荷斯坦牛进行初步选育，牛群质量和生产性能显著提高。选育后母牛6月龄、12月龄、24月龄平均体重分别达到187．94千克、296．07千克、484．07千克，比选育前分别提高33．02％、25．03％、21．47％3母牛第一胎305天平均泌乳量(4％标准乳)4231．75千克，比选育前提高12．38％，其中核心群平均为4812．00千克，比选育前提高27．79％。     

Scrapie in goats in Cyprus

Ovine scrapie was first recorded in Cyprus in 1985. Subsequently four dairy goats kept in two mixed flocks with affected sheep developed characteristic clinical signs similar to those seen in sheep. Fifteen goats from the two flocks were examined histologically and neurological lesions consistent with a diagnosis of scrapie were found in the four animals and in three others which had subsequently developed early neurological signs. These lesions were similar to those of naturally-affected sheep although neuronal degeneration and vacuolation were more severe in some cases.     

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 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 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 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.