河西走廊农区优质牧草引种栽培试验研究

根据3年的观察试验结果，对引种栽培的9个多年生牧草品种的物候期、产草量、品种特性、气候资源利用率等进行了对比分析，筛选出适合河西走廊农区生态条件下栽培的杂交狼尾草、黑麦草、Comndor苜蓿。以杂交狼尾草表现最为优良，平均鲜草产量达18．96万kg／hm^2。从而为河西走廊农区草种的选择奠定了基础。     

河西走廊农区优质绿肥饲草引种栽培试验

根据三年的观察试验结果，对引种栽培的9个多年生绿肥饲草品种的物候期、产草量、品种特性、气候资源利用率等进行了对比分析，筛选出了适合河西走廊农区生态条件下栽培的杂交狼尾草、黑麦草、Comndor苜蓿。以杂交狼尾草表现最为优良，平均每公顷鲜草产量达18．96万kg，从而为河西走廊农区草种的选择奠定了基础。     

河西走廊农区畜牧业可持续发展的结构调整探索

在阐述了河西走廊农区概况的基础上 ,分析了河西走廊农区畜牧业可持续发展的影响因素 ,对河西走廊农区畜牧业可持续发展的结构调整进行了探索性研究     

杂交狼尾草在苏南农区养殖业中的利用

杂交狼尾草具有高产、优质、耐高温和供草期长等特点，在苏南农区养殖业中起重要作用，研究表明，在以杂交狼尾草为主栽草种的集约草地模式中，３亩草地可养一头奶牛，杂交狼尾草的栽种面积占２５％，而鲜草，干物质和粗蛋白的产量占３６．１％、３７％和２７．７％。０．６亩草地可满足一亩亩产５００公斤鲜鱼的鱼塘青饵料需要，其中杂交狼尾草的产量比重占８３．７％。     

不同前作对杂交狼尾草产量和品质的影响

对长江流域农区不同粮草前作下杂交狼尾草的草产量、再生情况和营养品质进行了研究。结果表明,多花黑麦草茬的杂交狼尾草长势好、再生植株高、分蘖多、叶面积指数大、干物质积累多、产量较高。而且茎叶比较小、鲜干比较大、适口性较好。黑麦茬茬口较早,杂交狼尾草产量高,小麦茬表现最差。但是不同前作对杂交狼尾草的营养品质的影响较小。为了达到高产优质,杂交狼尾草应与多花黑麦草或黑麦进行复种。     

杂交狼尾草新品系遗传关系的RAPD分析

利用RAPD分子标记技术分析狼尾草属11个品种（品系）12份材料间的遗传关系,结果发现7个引物共扩增出82条带,其中多态性条带为60条,多态位点达73.2%,表明在这11个品种（品系）间具有较高的遗传多样性。从SPSS聚类分析结果发现,杂交狼尾草新品系1号、杂交狼尾草新品系2号与原品种杂交狼尾草有较为密切的亲缘关系,杂交狼尾草新品系1号与杂交狼尾草的遗传距离为0.033,杂交狼尾草新品系2号与杂交狼尾草的遗传距离也仅为0.067,从而为杂交狼尾草新品系1号、杂交狼尾草新品系2号与杂交狼尾草之间亲缘关系的确定提供了重要依据。此外,也发现象草新品系与摩特矮象草具有最小的遗传距离（0.033）。     

杂交狼尾草对獭兔饲喂效果的研究

自1981年江苏省农科院从美国引进杂交狼尾草后,该草在苏南农区被广泛栽种,用作奶牛、鱼及其他食草畜禽的青饲料。在种植杂交狼尾草养奶牛的模式中,每头牛每年平均节省精料300～500kg;在种草养鱼的模式中,杂交狼尾草的粗蛋白消化率及饵料系数分别为82.71％和23.5％,优于苏丹草,近似于豆科牧草红三叶。种植杂交狼尾草饲养肉兔,其适口性、利用率、日增重均优于象草。但上述研究,杂交狼尾草都是青刈后直接利用,而有关其深加工后饲喂效果的试验报道甚少。本试验以杂交狼尾草为主要原料,参照獭兔标准化饲养配方生产全价颗粒并进行饲喂试验,与杂交苏丹草、鲁梅克斯及     

杂交狼尾草栽培及其喂猪技术

杂交狼尾草(Pnnisetum amerieanum XP．purpureum)是美洲狼尾草(母本Pnnisetum amerieanum)和象草(父本Pnnisetum purpureum)的杂交种。它较好地综合了父本象草高产、多年生和母本美洲狼尾草品质好的特点。我国栽培的杂交狼尾草有两个来源．一是1981年从美国引进，另一个是1984年从哥伦比亚国际热带农业中心引进。由于母本美洲狼尾草是二倍体，而父本象草是四倍体，     

肥料对杂交狼尾草产量及粗蛋白的效应

杂交狼尾草的父、母本原产热带非洲,我省1981年从美国引进栽培。栽培试验表明:杂交狼尾草抗逆性强,适应性广,且具有较高的生产潜力,是鱼、兔及一些大牲畜喜食的优良青饲料。为了充分发挥其生产优势,探索肥料对其产量和品质的影响,1984年我们进行了杂交狼尾草的施肥试验。     

皇草微贮饲料的制作及对羊补饲的增重效果

皇草是一种禾本科狼尾草属多年生高产优质饲草品种,由象草和美洲狼尾草杂交育成。我所1993年从广东农科院引进栽培,经几年观察和试验,见其适应性广、产草量高(亩产鲜草可达3万kg)、品质好、易栽培等,具有广阔的开发前景,皇草喂奶牛、鸵鸟等都     

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 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 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.

     

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 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 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.