共查询到20条相似文献，搜索用时 156 毫秒
1.
多年生黑麦草不同播种量对混播草地产草量的影响 总被引：1，自引：0，他引：1
为了低投入高产出和有效地建植人工草地，发展草地奶牛业，贵州清镇地区对多年生黑麦草三种不同播种量的试验表明：１５ｋｇ多年生黑麦草＋６ｋｇ白三叶／ｈｍ＾２，２０ｋｇ多年生黑麦草＋６ｋｇ白三叶／ｈｍ＾２和２２．５ｋｇ多年生黑麦草＋６ｋｇ白三叶／ｈｍ＾２三种不同种籽用量的产草量之间差异不显著，我们初步认为，当地建植永久性多年生黑麦草和白三叶混播人工草地时，选择１５ｋｇ多年生黑麦草＋６ｋｇ白三叶／ｈｍ＾２的 相似文献
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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 总被引：1，自引：0，他引：1
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。 相似文献
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冷地早熟禾种子生产的优化栽培技术研究 总被引：2，自引：0，他引：2
采用３因素５水平二次回归正交组合设计试验,建立了冷地早熟种子产量（Ｙ）与播种量（Ｘ１）、行距（Ｘ２）和施肥量（Ｘ３）的回归方程：Ｙ＝４２．６１＋５．０１Ｘ１－７．８１Ｘ２＋７．７７Ｘ３＝２．２１Ｚ１Ｘ２＋１．４１Ｘ１Ｘ３－０．４１Ｘ２Ｘ３＝４．６４Ｘ１＾２＋６．３６Ｘ２＾２＋８．５６Ｘ３＾２;并提出西宁地区冷地早熟禾种子生产的优化农艺措施,播咎量８ｋｇ／ｈｍ＾２,播种行距２０－３０ｃｍ,种肥１５０ 相似文献
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南方苇状羊茅草地建植及利用研究 总被引：8，自引：1，他引：7
研究了红壤岗地建植苇状羊茅人工草地时,不同的播期,播法和利用期以及不同的刈割方式对苇状羊茅生长发育的影响。结果表明,在南方红壤岗地无灌溉条件下种植苇状羊茅,播期是成败的关键,秋旱过后立即播种最佳;条播稍好于撒播,覆土远胜于不覆土;播量以３０ｋｆ／ｈｍ＾２为宜,其鲜草产量１２３９９ｋｇ／ｈｍ＾２。 相似文献
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对６种青饲牧草用７种除草剂进行除草试验。证明播后苗前墨西哥类玉米用４０％阿特拉津胶悬剂０．９０ｋｇ（ａｉ）／ｈｍ＾２；Ｍ－８１Ｅ饲用高粱与串叶松香草适宜用６０％丁草胺乳油０．９０ｋｇ（ａｉ）／ｈｍ＾２；苏丹草适宜用６０％丁草胺乳油０．９０ｋｇ９ａｉ）／ｈｍ＾２与２５％绿麦隆可湿性粉剂０．９４ｋｇ（ａｉ）／ｈｍ＾２，紫苏用１２％恶草灵乳油０．２７ｋｇ（ａｉ）／ｈｍ＾２与８４％ｃｈｉｎｃｈ乳油１．８９ 相似文献
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毛苕子最适播种量试验研究 总被引：1，自引：0，他引：1
每公顷１５，３０，４５，６０，７５ｋｇ种子的不同播种量试验表明，３０ｋｇ的处理最佳，比对照（７５ｋｇ／ｈｍ＾２）种子增产２７．４％；４５ｋｇ次之，增产１２．５％；播量过大或过小均会减产。随着播种量的增加，单位面积株数，株高增加；单株分枝数，结荚总数，成熟荚数，结荚率，种子产量和千粒重减少。在确定最适播种量的同时，提出了毛苕子种子田的丰产栽培技术。 相似文献
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不同行距及播种量对宁农苏丹草种子生产性能的影响 总被引：3，自引：0，他引：3
试验于１９９５年在宁夏农学院草业科学研究所试验地进行。研究结果表明，苏丹草的株高和茎粗随播种量增加而减少，随行距增加而增加；行距越窄，单位面积上的总穗数越多，但千粒重越小；在一定范围内，随播种量的增加千粒重和单位面积上总穗数逐渐增加，但穗粒重减轻；行距对种子产量影响不大，播量２２．５ｋｇ／ｈｍ＾２时种子产量最高，为４１５０．２ｋｇ／ｈｍ＾２，故在生产上应推荐采用低播量中等行距的栽培方式。 相似文献
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为了掌握川西草原野生播娘蒿的生物学特性和经济价值，将川西地区的野生播娘蒿种子收集后在成都栽培观察，初步掌握了其生物学特性和生产价值，通过比较选出红原产播蒿的种子产量达到１１５９．５ｋｇ／ｈｍ＾２，含油量为４４．２０％，其油分中亚麻酸含量为４０．９０％，亚麻的理论产量可达２０９．４７ｋｇ／ｈｍ＾２，高寒草原产的播娘蒿引入低海拔地区种植可以秋播，幼细越冬生长正常，生育期为２１０ｄ，在高海拔区地区播娘蒿 相似文献
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本研究观察了利用秸秆覆盖对鸡舍氨气排放以及舍内环境恶臭影响效果.包括2个试验:试验一为实验室模拟,试验二为鸡舍现场测试.试验一分为11个组,鸡粪为对照组,另外分别选取不同类型秸秆材料覆盖鸡粪表面作为处理组,定期测定鸡粪氨气质量浓度,连续6d.结果表明,采用秸秆材料覆盖后各组氨气质量浓度均显著下降(P<0.05),尤其在覆盖初期.从全程来看,经过覆盖后氨气质量浓度始终保持在26mg/m3以下的组为麦秸末组,其次为玉米秸秆末组等.试验二选择在两栋建筑类型一致的肉鸡舍进行,网上平养,每舍3900只9日龄肉鸡.试验鸡舍网下地面采用不清粪、每两天覆盖一薄层玉米秸秆方式,而对照组鸡舍采用每两天清一次粪、不覆盖方式,试验开始两舍环境温度保持在33～35℃,之后连续对比测定环境指标9 d.结果表明,单独秸秆覆盖第1～4天试验鸡舍NH3和CO2质量浓度总体趋势低于对照组鸡舍(P>0.05);第5天开始利用秸秆覆盖并且辅助喷洒微生态茵液,试验组鸡舍NH3和CO2质量浓度与对照组鸡舍相比差异仍不显著(P>0.05),但均低于国家规定的26mg/m3标准.说明现场采用秸秆覆盖鸡粪方式来减少鸡舍氨气排放和环境影响效果,还受到多种因素的影响有待今后进一步深入研究. 相似文献
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试验研究窝箱不同加热方式对1~7 d仔貂生长性能的影响,选择了150只已成功交配的一岁母貂(标准黑貂),平均体重为( 1084.2±169.6) g,随机分成5组,每组30只,分别是对照组(无加热无笼网结构)、试验Ⅰ组(底部电热板19 ℃)、试验Ⅱ组(底部电热板15 ℃)、试验Ⅲ组(笼网结构加热10 ℃)、试验Ⅳ组(笼网结构不加热,＜10 ℃)。结果表明,各组间产仔个数、出生活仔数、出生成活率、7 d活仔数无显著差异(P>0.1),但7 d成活率各组间差异极显著(P<0.01),Ⅰ组7 d后的仔兽成活率显著高于Ⅲ组,而与其他各组间虽差异不显著,但均高于其他各组,Ⅲ组妊娠天数要明显高于其他组(P<0.01),而其他各组间差异不显著;Ⅰ、Ⅱ组的仔貂聚集度要明显低于其他各组,Ⅰ组混合度最高(20.8%),Ⅱ组的仔貂分散度最高(26.34%),Ⅳ组的仔貂分散度最低(4.55％);对照组的营救时间最短(5.24 s),明显低于其他各组。综合以上各项指标得出对于1~7日龄仔貂,窝箱底部电热板加热方式要优于笼网结构加热,当底部加热至19 ℃时,对仔貂成活最有利。 相似文献
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Nordquist B Fischer J Kim SY Stover SM Garcia-Nolen T Hayashi K Liu J Kapatkin AS 《Veterinary and comparative orthopaedics and traumatology》2011,24(6):435-444
OBJECTIVES: To document the contributions of trial repetition, limb side, and intraday and inter-week measurements on variation in vertical and craniocaudal ground reaction force data. Methods: Following habituation, force and time data were collected for all four limbs of seven Labrador Retrievers during sets of five valid trot trials. Each set was performed twice daily (morning and afternoon), every seven days for three consecutive weeks. A repeated measures analysis of variance was used to determine the effects of limb, trial, intraday, and inter-week factors on ground reaction force data for the thoracic and pelvic limbs. RESULTS: Of the four factors evaluated, variation due to trial repetition had the largest magnitude of effect on ground reaction forces. Trial within a set of data had an effect on all craniocaudal, but not vertical, ground reaction force variables studied, for the thoracic limbs. The first of five trials was often different from later trials. Some thoracic limb and pelvic limb variables were different between weeks. A limb side difference was only apparent for pelvic limb vertical ground reaction force data. Only pelvic limb craniocaudal braking variables were different between sets within a day. DISCUSSION AND CLINICAL SIGNIFICANCE: When controlling for speed, handler, gait, weight and dog breed, variation in ground reaction forces mainly arise from trial repetition and inter-week data collection. When using vertical peak force and impulse to evaluate treatment, trial repetition and inter-week data collection should have minimal effect of the data. 相似文献
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Schaufelberger KS Zottmaier B Wanner M Wichert B 《Research in veterinary science》2011,91(3):e113-e115
The objective of the present study was to investigate the influence of diet composition on enzyme activities in feline leukocytes. In trial A, the enzyme activity was measured in six normal weight cats fed four cooked diets with varying protein, fat and carbohydrate contents and different protein sources. In trial B, six normal weight and six obese cats were fed on dry food of different protein and carbohydrate content.The enzyme activities did not show a distinct and consistent reaction to different diet compositions. Therefore, it is doubtful, if enzyme activities in feline leukocytes are an appropriate tool to examine the metabolic state or detect metabolic diseases in cats. 相似文献
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《Research in veterinary science》2012,92(3):e113-e115
The objective of the present study was to investigate the influence of diet composition on enzyme activities in feline leukocytes. In trial A, the enzyme activity was measured in six normal weight cats fed four cooked diets with varying protein, fat and carbohydrate contents and different protein sources. In trial B, six normal weight and six obese cats were fed on dry food of different protein and carbohydrate content.The enzyme activities did not show a distinct and consistent reaction to different diet compositions. Therefore, it is doubtful, if enzyme activities in feline leukocytes are an appropriate tool to examine the metabolic state or detect metabolic diseases in cats. 相似文献
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能量摄入水平对放牧绒山羊养分消化和产绒性能的影响 总被引：1，自引：0，他引：1
试验旨在研究生绒旺盛期内不同能量摄入水平对放牧绒山羊养分消化和产绒性能的影响。选用28只3周岁体重和上年度产绒量相近的内蒙古白绒山羊羯羊,随机分为4组,每组7个重复。试验于绒生长旺盛期(2006年9—11月)进行,羊群白天放牧,晚上归牧后对试验1、2、3组分别补饲3种不同能量水平(1.62、3.16MJ/kg和4.58MJ/kg)的日粮,对照组不补饲。换算成全日粮后,对照组和试验1、2、3组的代谢能摄入量分别为714.99、758.32、834.24、904.56KJ/(kgW0.75·d)。结果表明:提高能量摄入水平对干物质消化率有显著影响(P<0.05);不同能量摄入对产绒量、绒厚度、绒伸直长度、绒占被毛总重比例和净绒率的影响不显著(P>0.05),提高能量摄入使绒细度有增粗的趋势,试验2组显著粗于其他组(P<0.05)。 相似文献
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Essential fatty acids supplementation in different-stage atopic dogs fed on a controlled diet 总被引：1，自引：0，他引：1
Abba C Mussa PP Vercelli A Raviri G 《Journal of animal physiology and animal nutrition》2005,89(3-6):203-207
The aim of this trial was to evaluate the effects of polyunsaturated fatty acid (PUFA) supplementation in different-stages atopic dogs fed on a controlled diet. Twenty-two non-seasonal atopic dogs of different breeds and ages were included in the 2-month trial. All the patients were given an essential fatty acid (EFA) supplementation [17 mg/kg eicosapentaenoic acid (EPA) + 5 mg/kg docosahexaenoic acid (DHA) + 35 mg/kg gammalinolenic acid (GLA)], the global (diet + supplementation) omega-6 to omega-3 ratio was 5.5-1. Two groups of dogs were considered: group A 'pre-immunotherapy' (15 cases) included dogs with early stages atopy, which had not been submitted to any treatment yet; group B 'post-immunotherapy' (seven cases) included dogs with chronic atopy immunotherapy non-responsive. Clinical evaluations were performed at the beginning, on day 30 and at the end of the trial. Blood serum fatty acids profile was determined at the beginning and at the end of the study. Better clinical results were obtained in group A, a great difference was found between the two groups on pruritus score. Serum arachidonic acid (AA) was significantly lower at the end of the trial in group A while GLA was significantly higher in group B. We hypothesized that different-stages atopic dogs could have different response to EFA supplementation, maybe because of a different fatty acids metabolism. Early stages cases seem to be more responsive to EFA supplementation. 相似文献
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J A Hawkins R R Evans T J Newby M H Delivorias T D Tyler 《Veterinary parasitology》1985,17(3):229-238
The efficacy of a morantel sustained release bolus (MSRB) for control of gastrointestinal nematodes in yearling steers was evaluated over a 6-month grazing period commencing on 26 March 1982. Three groups of 15 steers were allotted to the following treatments: Group 1 -- one MSRB at start of trial; Group 2 -- one therapeutic dose of thiabendazole at start of trial; Group 3 -- untreated control. The treatment groups were grazed separately. Parasite egg counts (EPG), herbage larval counts, pepsinogen levels and weight gains were monitored. Every other month, sets of 2 parasite-free tracer calves were placed in the pasture grazed by each treatment group and allowed to graze for 3 weeks before being subsequently necropsied for worm counts. At the end of the trial, 6 animals from each group were also necropsied for worm counts. The MSRB treatment resulted in significantly lower egg counts, fewer infective larvae on pasture, lower pepsinogen levels and lower worm burdens in tracer calves than was the case for the untreated group, but generally the levels were not significantly different from those associated with the thiabendazole treatment. The mean weight gain for the MSRB treated steers showed a significant advantage (70.9 lb) over the untreated animals, but was not significantly different from those which received thiabendazole. Total worm counts at the end of the trial were not different from any treatment group. 相似文献
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本试验旨在研究不同浓度苜蓿黄酮对体外培养奶牛乳腺上皮细胞增殖与抗氧化的影响。试验利用含不同浓度0 μg/mL(对照组)、25 μg/mL(试验Ⅰ)、50 μg/mL(试验Ⅱ)、75 μg/mL(试验Ⅲ)、100 μg/mL(试验Ⅳ)苜蓿黄酮的培养基进行细胞培养。结果表明,1)细胞培养第3天,各组细胞增殖无显著差异,但第5天试验Ⅱ~Ⅳ组细胞增殖能力极显著高于对照组和试验I组(P<0.01)。2)试验Ⅱ~Ⅳ组一氧化氮(NO)水平明显高于对照组与试验Ⅰ组,且差异极显著(P<0.01)。试验Ⅰ组、Ⅱ组、Ⅳ组的乳酸脱氢酶(LDH)活性显著低于对照组与试验Ⅲ组,且差异极显著(P<0.01),但对照组与试验Ⅲ组差异不显著。3)试验Ⅳ组细胞内过氧化氢酶(CAT)含量极显著高于其他各组(P<0.01),而试验Ⅲ组丙二醛(MDA)含量极显著低于其他各组(P<0.01);试验Ⅱ和Ⅲ组的谷胱甘肽过氧化物酶(GSH-PX)活性极显著高于其他各组(P<0.01),而各处理组细胞的超氧化物歧化酶(SOD)含量差异不显著。4)试验Ⅱ和Ⅲ组细胞p53、Caspase-3、SOCS3和STAT1基因的相对表达量极显著低于对照组(P<0.01)。因此,苜蓿黄酮能够促进体外培养奶牛乳腺上皮细胞的增殖,提高细胞抗氧化的能力,抑制细胞凋亡,其中添加浓度为75 μg/mL组效果最好。 相似文献