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饲用墨西哥玉米适应性及其营养成分含量 总被引：4，自引：0，他引：4
随着养殖业畜群结构的调整,农区草食动物饲养量的增加,种植优质、高效牧草是当前人们所迫切需要的。本试验就饲用墨西哥玉米的生长特性及其营养成分含量进行研究。饲用墨西哥玉米适宜于在冀东农区种植,该作物具有较强的分蘖性能,适于多次的刈割,每茬次刈割株鲜草重在400~700 g之间,随着刈割茬次的增加,草产量大幅度增加,可采食的优质草量增多,纤维化程度大大下降,可消化养分量增加,种草的效益随刈割茬次显著的上升。墨西哥玉米牧草干物质、粗蛋白质、粗脂肪、粗纤维、粗灰分、钙、磷和胡萝卜素的含量都好于其他禾本科牧草。刈割茬次间各种营养成分差异不大,非常适合青饲,经饲喂各种草食动物,适口性好,采食率高。 相似文献
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对皖西南地区春播的9个牧草品种的适应性,草产量和营养成分进行分析,结果表明:墨西哥玉米、菊苣、杂交狼尾草、甜高粱产量高,干草产量和鲜草产量均在95 t/hm2和15 t/hm2以上,适应性强,品质优良,适合在皖西南地区大面积推广种植。苦荬菜和籽粒苋产量中等,蛋白质含量高达22%以上,青绿多汁,适口性好,可以做为优质牧草在皖西南地区大面积推广种植。饲用玉米、皖草2号、苏丹草产量较低,鲜草产量均在70 t/hm2以下,饲用玉米无再生性,皖草2号、苏丹草在高温条件下病虫害严重,种植时应该注意病虫害防治。 相似文献
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《饲料研究》2021,(4)
试验旨在筛选适合引黄灌区麦后复种饲用高粱、高丹草和青贮玉米品种,引进13个优质品种采用随机区组试验设计。结果显示:饲用高粱鲜草产量高于高丹草和青贮玉米品种,高丹草3901在鲜草产量、株高、茎粗、叶片数、叶长、叶面积显著高于CFSH30 (P0.05)。青贮玉米叶面积最大,与高丹草中三个品种相比差异显著(P0.05)。复种饲用高粱、高丹草、青贮玉米品种各农艺性状相关性分析表明,鲜草产量与茎粗、株高显著正相关,茎粗与叶片数、叶宽、叶面积极显著正相关。复种牧草营养成分测定、饲用价值评定结果表明,复种青贮玉米品种饲用价值较好,评定为特级,高丹草、饲用高粱品种等级评定均在3级以上。综合提示,饲用高粱3701、高丹草3901和饲用玉米屯玉168优势相对突出,可作为宁夏引黄灌区麦后复种生产优质饲草的主推品种。 相似文献
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饲用墨西哥玉米生长特性及其营养成分含量的研究 总被引：4，自引：0，他引：4
随着养殖业畜群结构的调整,农区草食动物饲养量的增加,种植优质、高效牧草是当前人们所迫切需要的.试验就饲用墨西哥玉米Euchlaena mexicana的生长特性及其营养成分含量进行研究,结果表明:饲用墨西哥玉米适宜在冀东农区种植,该作物具有较强的分蘖性能,适于多次刈割,每茬次刈割鲜草质量400～700 g/株,随着刈割茬次的增加,草产量大幅度增加,可采食的优质草量增多,纤维化程度大大下降,可消化养分量增加,种草的效益随刈割茬次显著的上升.墨西哥玉米干物质、粗蛋白、粗脂肪、粗纤维、粗灰分、钙、磷和胡萝卜素的含量都优于其他禾本科牧草.刈割茬次间各种营养成分差异不大,非常适合青饲,经饲喂的各种草食动物,适口性好,采食率高. 相似文献
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中原单32号杂交玉米是由中国农科院原子能利用研究所育成的一种粮饲兼用型新品种,具有适应性强、生育期短、产量高、品质好等特点.自1997年11月通过农业部的牧草品种审定后,已在全国大面积推广种植.为了进一步探索其生产性能和饲用价值,为大面积推广种植提供理论依据,1999年我们引进该品种,测定其在不同施肥条件下与掖单13号、掖单19号玉米的产量(包括秸秆产量)对比试验. 相似文献
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误区之一：什么都是草。其实不然。人们通常所指的草是自然状态下自生自灭的野(杂)草，其特点是早春萌发力强，抗旱、抗瘠，但其营养价值差、适口性差、产量低。现在我们所提倡种的草，是指经过人工培育出的饲用优质牧草，其特点是早期萌发力弱，对生长有一定的条件要求，但其营养价值高，产量高，甚至是野(杂)草的成百倍。由此可见，我们现在提倡种植的草，是专指用于饲喂畜禽的优质牧草，而不是泛指自然状态下生存的野草。误区之二：什么地方都能种草。对优质牧草而言，不同的品种对土壤有不同的要求，譬如，盐碱地只适合种植耐盐碱的牧草… 相似文献
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墨西哥饲用玉米（Euchlaena mexicana Schrad）属暖季型一年生禾本科牧草，本文通过不同播种方式与生产性能相关性的研究，大棚育苗移栽等播种方式的应用，以延长该草刈割利用期，提高产草量，缓解初夏禾本科牧草青黄不接的难题。 相似文献
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为了选出适宜在半干旱区种植的饲用植物,选取饲用玉米(Zea mays)、饲用高粱(Sorghum bicolor)和苏丹草(Sorghum sudanense)3种饲用作物和紫花苜蓿(Medicago sativa)、老芒麦(Elymus sibiricus)2种牧草为研究对象,在无灌溉和施肥的管理条件下,比较分析其干物质产量、营养品质及饲用价值。结果表明,高粱(引自日本)的株高最高(289.25 cm),比甜高粱和玉米高约10%,苏丹草SP20(引自美国)株高最低(172.80 cm);甜高粱干物质产量最高(17.38 kg·m–2),其次为高粱(12.35 kg·m–2),均显著高于玉米(P<0.05)。苏丹草中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)含量相对较低,甜高粱与饲用玉米NDF和ADF含量差异不显著(P>0.05)。苏丹草和紫花苜蓿相对饲用价值(RFV)值较高(135~143),其次是饲用玉米和甜高粱(107~109),高粱和老芒麦最低(95~102)。综合分析结果表明,在半干旱地区种植甜高粱具有与饲用玉米同等的饲用价值,但甜高粱具有更高的产量,因此在半干旱区种植甜高粱具有一定的发展潜力。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献