高寒半干旱区油菜与豆科牧草混播草地施肥效应

油菜与豆科牧草混播草地施肥效应表明，氮磷合理配施促进土壤水分消耗，干草、植物量和施肥产投比显著提高。坡梁地最高植物产量施肥量Ｎ为７８．０６ｋｇ／ｈｍ２，Ｐ２Ｏ５为６１．１５ｋｇ／ｈｍ２，最高干草产量施肥量Ｎ为７６．６５ｋｇ／ｈｍ２，Ｐ２Ｏ５为５７．２９ｋｇ／ｈｍ２，增产效果Ｎ＞Ｐ２Ｏ５；旱滩地最高植物产量施肥量Ｎ为５８．３３ｋｇ／ｈｍ２，Ｐ２Ｏ５为５５．６８ｋｇ／ｈｍ２，最高干草产量施肥量Ｎ为５３．６０ｋｇ／ｈｍ２，Ｐ２Ｏ５为５９．１１ｋｇ／ｈｍ２，增产效果Ｐ２Ｏ５＞Ｎ；且氮磷具有明显的正交互效应。氮磷合理配施还显著提高了水分利用效率，坡梁地和旱滩地分别提高３．０５和２．６７ｋｇ／（ｍｍ．ｈｍ２）。     

秋播箭舌豌豆喷施“益微”增产菌的效果

在复种箭舌豌豆上用２２５ｇ／ｈｍ＾２、３００ｇ／ｈｍ＾２的剂量进行２次叶面喷施，其鲜草产量分别达２８００１．４ｋｇ／ｈｍ＾２、２９６６８．２ｋｇ／ｈｍ＾２，比不喷施赠草量１３．５％和２０．３％。     

籽粒苋No2高产栽培的正交组合试验

以籽粒苋进行了不同播期，密度，施肥量的正交组合试验，结果表明各处理间产量差异显著，以播期在５月１５日，密度在８．３３４万株／ｈｍ＾２，量在基肥３万ｋｇ／ｈｍ６２，种肥二胺１５０ｋｇ／ｈｍ＾２，追肥尿素１５０ｋｇ／ｈｍ６２的处理，产量最高，达９．９１５万ｋｇ／ｈｍ＾２。     

草坪杂草化学防除研究初报

防除草坪中双子叶杂草用７２％的２，４－Ｄ丁酯０．７５￣０．９８ｋｇ／ｈｍ＾２或７２％的２甲４氯１．５ｋｇ／ｈｍ＾２，株防效为８６．２％￣９６．９％；防除草坪中单子叶杂草可根据草坪的建植年限及草坪草的高度选用１２％的恶草灵３．６￣４．２ｋｇ／ｈｍ＾２或１２．５％的拿扑净０．９ｋｇ／ｈｍ＾２，防效为８６％￣９４．９％；同时防除单、双子叶杂草用恶草灵复配剂３．２￣４．０ｋｇ／ｈｍ＾２或拿扑净复配剂１．７     

祁连山北麓高寒牧区人工混播草地适宜播种与施氮量的研究

试区燕麦与箭舌琬豆混播条件下播种量与施Ｎ量关系的研究结果表明，播种量对产草量影响较大，施Ｎ量影响程度相对较小；播种量与施Ｎ量之间呈负交互效应，其最佳配比线方程为Ｂ＝２７１．６３９８－０．１１９３Ｎ；鲜草产量最大时的播种量为２３７ｋｇ／ｈｍ＾２，施Ｎ量为２９０ｋｇ／ｈｍ＾２。     

冷温半干旱黄土丘陵区荒坡地沙打旺系统生态效能的调查研究

通过典型调查的方法，对渭源县北部冷温半干旱黄土丘陵区荒坡的地沙打旺系统的生态效能进行了初步研究。结果表明：一，二和三年沙打旺地上部分风干草平均产量依次是８３４．０，３９０１．５和８９２０．５ｋｇ／ｈｍ＾２，粗蛋白质平均产量依次是１６６．５，６２１．０和１０５３．０ｋｇ／ｈｍ＾２，产出能依次是１．３４６，６．５１８和１４．７２８×１０＾１＾０Ｊ／ｈｍ＾２，光能利用率分别是０．０５３％，０．２５４％和     

臂形草属牧草品种比较试验

对８种臂形草属热带牧草的品种进行了比较试验研究，３年的试验结果表明，饲草产量以网脉臂形草产量最高，年干物质产量为２４２７１ｋｇ／ｈｍ＾２，其次为ＣＩＡＴ ６０９５刚果臂形草，年干物质产量为２０９８６ｋｇ／ｈｍ＾２，四生臂形草产量最低，年干物质产量仅为１１８２ｋｇ／ｈｍ＾２。     

行距及施肥量对兰引3号结缕草种子产量的影响

研究了不同行距及施肥量对兰引３号结缕草种子产量与种穗数量的影响，并对种穗数与其种子产量间的关系进行了回归和相关分析。结果表明：在１０ｃｍ，３０ｃｍ，４０ｃｍ，５０ｃｍ和６０ｃｍ的行距处理中，５０ｃｍ处理的种子产量和种穗数均极显著地高于其它处理，种穗数与其种子产量呈极显著正相关（ｐ＝０．０００，ｒ＝０．８７５），种穗数控制了种子产量的７６．６％；种子田的施肥量以Ｎ——１００ｋｇ／ｈｍ２、Ｐ２Ｏ５——５０ｋｇ／ｈｍ２、Ｋ２Ｏ——５０ｋｇ／ｈｍ２最为经济，施肥后兰引３号结缕草生殖枝数量显著增多是其种子产量大幅度提高的主要原因。     

高寒地区优良牧草的筛选及生产性能研究

为解决高塞牧区冬季家畜补饲需要,进行了优良牧草的引种栽培及生产性能的研究。结果表明,优选出的无芒雀麦、老芒麦、甘肃红豆草和甘农１号杂花苜蓿的干草产量在第６年仍然能分别达到３３１７０．０、３１１３３．３、１００５６．０和１１０７７．３ｋｇ／ｈｍ＾２,粗蛋白质产量最高的是老芒麦、最低的是甘肃红豆草,分别是５０５９．９和１４９０．９ｋｇ／ｈｍ＾２。牧草产量从栽培第２年开始逐年增加,第６年的产量第１年的１２～２２倍。     

燕麦品种性状变异的研究

在西宁地区,对６３２个燕麦品种的性状进行了研究,结果表明,品种间的性状差异很大,不同品种各性状最大与最小值的范围为;生育期７５￣１３８ｄ,千粒重１３．２￣５８．３ｇ,茎粗０．２５￣０．７６ｃｍ,株高７４．２￣２１０．０ｃｍ,单株粒重１．５￣１４．９ｇ,拮秆产量３０３０￣１４９１０ｋｇ／ｈｍ＾２,籽实产量１５００￣５９２５ｋｇ／ｈｍ＾２,粒色有白、黄、褐、棕、黑等;株高,生育期和产量三者之间呈正相关     

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 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.