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几种热带禾草烧草效应的初步观察 总被引：1，自引：0，他引：1
本文主要说明20种热带禾本科牧草火烧效应的初步结果。烧草后,表现优的品种有甘巴草、坚尼草、汉密尔坚尼草、湿生臂形草、旗草、巴拉草、南迪狗尾草、卡松古鲁狗尾草,青绿黍、杂交象草:表现良的品种有巴夫草、内洛克狗尾草、象草、粽籽雀稗;表现中等的品种有格顿坚尼草、罗得草、危地马拉草:表现差的品种有糖蜜草、红苞茅、岸杂一号狗牙根。 相似文献
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怒江干热河谷牧草适应性研究 总被引：1，自引：1，他引：0
在云南怒江干热河谷地区对引进的16个禾本科热带牧草进行区域适应性研究,结果表明,参试的 16个牧草品种(品系)均能适应云南怒江干热河谷气候。在产量方面,红象草(Pennisetum purpureum cv. Red)产量最高,干草产量达35 915.00 kg/hm2,极显著高于参试的其他15个牧草品种（P<0.01）。其次是热研8号坚尼草（Panicum maximum cv.Reyan No.8）、热研9号坚尼草(P.maximum CIAT 9)、TD 58坚尼草(P.maximum cv.TD 58)和热研6号珊状臂形草（Brachiaria brizantha cv.Reyan No.6）,以上4个牧草品种产量之间差异不显著（P>0.05）,但显著高于杂交臂形草(B.hybrid)（P<0.05）,极显著高于参试的其他10个牧草品种。红象草、热研8号坚尼草、热研9号坚尼草、TD 58坚尼草、热研6号珊状臂形草等牧草品种饲草产量高、生长迅速、刈割再生能力强、抗旱性强,适宜在干热河谷地区推广种植。 相似文献
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为了获得栽培于广西的3种臂形草和2种坚尼草的营养价值.试验结合注射器式体外产气法和常规化学成分分析法评定成熟期新鲜坚尼草TD58、坚尼草CI.AT6299、珊状臂形草、杂交臂形草、俯仰臂形草的营养价值.瘤胃液来源于2头健康状况良好的带有瘤胃瘘管的水牛,记录了2、4、6、9、12、24、36、48、72、96 h的累积产气量,并取发酵了96 h的底物作为测定乙酸、丙酸和丁酸,以及氨态氮的含量.试验结果显示,从各时间点累积产气量来看,以臂形草类的俯仰臂形草最高;坚尼草CIAT6299的累积产气量较坚尼草TD58高.潜在产气量最高的为俯仰臂形草,最低的为坚尼草TD58;总挥发性脂肪酸浓度在68.21～74.86 mM范围内,乙酸摩尔百分数在53.66％～56.61％范围内,丙酸摩尔百分数在25.51％～33.48％范围内,乙酸/丙酸比在1.62～2.10.氨态氮浓度在22.25～26.96 mg/100 ml;微生物蛋白产量在3.82～4.43 mg/ml.根据饲料相对评定指数(RFV)计算公式得到RFV值,从大到小排列顺序为;杂交臂形草(81.85)＞俯仰臂形草(74.60)＞珊状臂形草(72.91)＞坚尼草CIAT6299(66.4)＞坚尼草TD58(63.13);可消化有机物质含量和代谢能从大到小的顺序为:坚尼草TD58 (509.72 g/kg,5.4 MJ/kg DM),坚尼草CIAT6299(531.09 g/kg,5.84 MJ/kg DM),珊状臂形草(552.28 g/kg,6.27 MJ/kg DM),杂交臂形草(596.80 g/kg,7.18 MJ/kg DM),俯仰臂形草(614.78 g/kg,7.55 MJ/kg DM). 相似文献
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为探讨C4牧草在北亚热带的适应性和生产性能,筛选出适合北亚热带中山地区种植的牧草,于2009年5-11月,对宽叶雀稗Paspalum wettsteinii、威提特东非狼尾草Pennisetumclandestinum cv.Whittet、纳罗克非洲狗尾草Setaria sphacelata cv.Narok和贝斯莉斯克伏生臂形草Brachiaria decumbens cv.Basilisk进行田间栽培试验,研究各种群产草量、营养成分、高度和密度等指标的动态变化。结果表明:1)臂形草和非洲狗尾草的干物质产量显著高于宽叶雀稗和东非狼尾草(P0.05);饲草供应集中于7月中旬-9月底;2)非洲狗尾草粗蛋白产量显著高于其他3种牧草(P0.05);3)4种牧草品质营养期优于开花期,适宜于营养期刈割。对各指标综合评价后初步认为,4种牧草的种植表现由好到差依次为非洲狗尾草、臂形草、宽叶雀稗和东非狼尾草。 相似文献
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Vitamin B12 deficiency was induced in 15 small East African goats by feeding cobalt deficient Chloris gayana hay (containing 0.02 mg of Co/kg dry matter) over a 25 week experimental period. Cobalt was supplemented as an oral drench to supply 0.3 g of Co/goat/week to 15 treated goats. At intervals of 3-4 weeks, serum concentrations of Vitamin B12 , total thyroxine (TT4), free tetra-iodothyronine (FT4) and free tri-iodothyronine (FT3) were determined by radioimmunoassay, while the rate of resting metabolism was determined by measuring the goats' rate of oxygen consumption. Serum Vitamin B12 concentration was significantly higher (p<0.01) in cobalt-treated (289.6 +/- 40.76 pg/ml) than in control (142.8 +/- 28.27 pg/ml) goats. The mean serum TT4 concentration was significantly (p<0.01) higher in control (59.0 +/- 1.70 nmol/l) than in cobalt-treated (51.6 +/- 2.45 nmol/l) goats. However, the levels of FT4, FT3 and the rate of resting metabolism were unaffected by the goats' cobalt status. Furthermore, the goats did not lose weight or become anaemic. 相似文献
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国外牧草品种比较试验 总被引：1，自引：0，他引：1
本文在福建福清对引进的３４种国外牧草进行３年比较试验结果表明：适用于福建推广的多年生优良牧草有以下１６种,豆科：大翼豆,柱花草,银合欢,白三叶;禾本科;卡松古鱼狗尾草,宽叶雀稗,罗得草,巴拉草,隐花狼尾草,几内亚草,青绿黍,毛花雀稗,草地羊茅,鸡脚草,多年生黑麦草。 相似文献
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THE EPIDEMIOLOGY OF EQUINE STRONGYLOSIS IN SOUTHERN QUEENSLAND 2. The Survival and Migration of Infective Larvae on Herbage 总被引：1，自引：0，他引：1
A. W. English 《Australian veterinary journal》1979,55(7):306-309
The seasonal changes in longevity on herbage of the infective larvae of strongylid nematodes of the horse were studied. During the summer months, 1% of the larvae survived on herbage for 2-3 weeks, with 0.2% still viable for a further 2-3 weeks. Equivalent survival periods in winter were 7-11 weeks and over 11 weeks respectively. During spring and autumn, larvae survived for periods varying from 3-8 weeks. On Rhodes grass (Chloris gayana) growing vigorously in the summer of 1976, the majority of larvae remained in the lowest layers of the pasture, within 10 cm of the soil surface. Very few reached the highest fraction of grass sampled, above 40 cm from the soil. More larvae were recovered higher on the pasture in a period when less torrential rain had occurred. It was concluded that the parasitological benefits to be gained from short-term mixed grazing with horses and cattle may be minimal, in view of the tendency of cattle to eat only the upper layers of the pasture initially, with a consequent increase in the number of infective larvae per unit weight of herbage remaining. 相似文献
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Osuga IM Abdulrazak SA Muleke CI Fujihara T 《Journal of animal physiology and animal nutrition》2012,96(4):634-639
Twenty growing Small East African goats were used to determine the effects of feeding sun-dried leaves of the browse forages Berchemia discolor and Zizyphus mucronata as supplements to low-quality basal diet, Rhodes grass (Chloris gayana) hay, on voluntary feed intake (VFI), digestibility and growth performance. The grass hay and maize bran were used as a control. The dried leaves were then included at the rates of 15% and 30% of the dry matter intake (DMI). Berchemia discolor had the highest crude protein (CP) content of 195.5 g/kg DM, while Z. mucronata had CP content of 169.5 g/kg DM. The grass hay had the lowest CP content of 50.9 g/kg DM. The browse forages had low fibre content [Neutral detergent fibre (NDF); 257.9-369.5 g/kg DM], while the grass hay had high fibre content (NDF; 713.1 g/kg DM). Goats in the groups supplemented with either of the browse forages had higher total DMI, nitrogen (N) intake and retention and live-weight gains than those in the control diet group. The digestibility of DM and organic matter (OM) was not affected by supplementation, but the CP digestibility increased with supplementation. The use of the browse forages as supplements for goats fed on poor-quality basal diets would enhance the performance of the animals. 相似文献
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C.S. Dannhauser 《African Journal of Range and Forage Science》2013,30(1):64-68
Digitaria eriantha subsp. pentzii (= D. decumbens), Cynodon nlemfuensis en “Coastcross II” (Cynodon‐Hibried) was met behulp van steggies gevestig is, en Chlorisgayana. Pennisetum clandestinum en Cynodon dactyton (Pasto Rico), wat met behulp van saad gevestig is, het die beste bedekkings‐waarde gedurende die seisoen van vestiging gelewer. Van die voormelde spesies het die basale bedekking van Chloris gayana, Pennisetum clandestinum, Cynodon dactylon (Pasto Rico) en Digitaria eriantha subsp. pentzii ( = D. decumbens) gedurende die vier jaar wat die proef geduur het, na bevredigende aanvanklike bedekking, toegeneem of minstens konstant gebly. Die beste vestiging is gedurende Desember verkry, terwyl aangetoon is dat ‘n bemesting van ten minste 120 kg N + 16 kg P/ha nodig is om ‘n goeie bedekking en produksie per ha gelewer. 相似文献
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中国矮马血红蛋白多态性的初步研究 总被引：4，自引：0，他引：4
采用等电聚焦电泳对中国矮马进行了血红蛋白多态性的检测。结果表明 :在该位点共发现有 2种基因型 ,由 2个等位基因HbBⅡ 、HbBⅠ 控制。基因型BⅡ /BⅡ、BⅠ /BⅡ的频率分别为 0 62 5 0、 0 375 0 ,其中纯合型BⅡ /BⅡ为优势基因型。基因频率HbBⅡ 、HbBⅠ 分别为 0 81 2 5、0 1 875。其基因杂合度 (H)、个体鉴别概率 (Dp)和亲仔关系排除概率 (PE)分别为 0 30 4 7、 0 4690和 0 1 2 90。 相似文献
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为确定淹水胁迫下适应性相对较强的苜蓿(Medicago sativa)品种,以‘金皇后’(B1)、‘阿尔金刚’(B2)、‘维多利亚’(B3)、‘巨能551’(B4)和‘巨能耐湿’(B5)为材料,研究了淹水处理对不同苜蓿品种群体质量和品质的影响。结果表明,随着淹水时间增加,不同苜蓿品种草产量之间差异显著,与0d相比1d淹水处理下B3,B4,B5的产量增加,随水淹胁迫时间的增加产量逐渐下降,而B1,B2则随淹水时间延长持续降低,5d时各品种草产量表现为B5B1B4B3B2;短期淹水对B1,B3,B5株高有促进作用,之后随时间延长逐渐降低,淹水5d时明显高于B2,B4。淹水5d时,B1,B4,B5的叶片数显著高于B2,B3,而B5的生长速率较0d仅降低15.38%,生长速率显著高于其他品种,其节间数、分枝数、根长和根重也均显著高于其他各品种;同时淹水5d时,B5光合能力显著强于其他品种,表现为B5B1B4B2B3;而品质上,B1,B4,B5在水淹胁迫后牧草品质均显著优于B2和B3。综上所述,‘巨能耐湿’(B5)在淹水胁迫下抗逆和恢复能力表现较好,群体质量相对较高,对产量品质影响较小,适宜在我国淮河以南多雨地区推广种植。 相似文献
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96份雀麦属材料遗传多样性的ISSR分析 总被引：6，自引：1，他引：5
利用ISSR分子标记技术研究了来自国内外的96份雀麦属材料的遗传多样性。19个ISSR引物共扩增出109条谱带,其中106条是多态性谱带,多态性位点比率为97.25%。POPGENE 1.31软件分析结果显示:96份雀麦属材料总的基因多样性指数(Nei’s)为0.2756,Shannon信息指数为0.4257,遗传多样性水平较高;基因流(Nm)为1.3273,各种群间有一定的基因交流。用SLT_NTsys2.1e软件进行UPGMA聚类分析表明,96份材料可分为6个类群,与主成分分析结果基本一致。用Arlequin3.1软件进行AMOVA分析表明,种间的分子变异比率为15.85%,种内的分子变异比率为84.15%,种内分子变异较大,种内遗传多样性高于种间的遗传多样性。 相似文献