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本试验选取21头10月龄、体重26kg左右的湘东黑山羊,随机分成3组,其中A组为对照组,饲喂基础日粮,B组和C组为试验组,分别在饲喂基础日粮的基础上,补饲尿素含量为7%和10%的尿素糖蜜舔砖,以研究尿素糖蜜舔砖对山羊增重效果的影响。结果表明:补饲尿素糖蜜舔砖后,湘东黑山羊营养状况大大改善,增重速度得到不同程度的提高。补饲舔砖的B、C试验组日增重分别为0.12kg和0.15kg,比对照组分别高50%和87.5%,试验C组比试验B组高2 5%,经方差分析差异及显著(P<0.01)。试验B、C组中每只羊比对照组分别多收入8.34元和17.13元。从而也得出10%尿素添加比7%尿素添加的舔砖补饲山羊的效果要好。 相似文献
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山羊尿素舔砖不同添加水平的效果试验 总被引：2，自引：0，他引：2
本试验选取21头10月龄、体重26kg左右的湘东黑山羊,随机分成3组,其中A组为对照组,饲喂基础日粮,B组和C组为试验组,分别在饲喂基础日粮的基础上,补饲尿素含量为7%和10%的尿素糖蜜舔砖,以研究尿素糖蜜舔砖对山羊增重效果的影响.结果表明:补饲尿素糖蜜舔砖后,湘东黑山羊营养状况大大改善,增重速度得到不同程度的提高.补饲舔砖的B、C试验组日增重分别为0.12kg和0.15kg,比对照组分别高50%和87.5%,试验C组比试验B组高2 5%,经方差分析差异及显著(P<0.01).试验B、C组中每只羊比对照组分别多收入8.34元和17.13元.从而也得出10%尿素添加比7%尿素添加的舔砖补饲山羊的效果要好. 相似文献
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选用9只5月龄的萨福克×小尾寒羊杂交绵羊,随机分为3组,研究日粮中不同来源氮对绵羊消化代谢的影响.对照组饲喂常规日粮A,试验组分为2组,分别为尿素组饲喂日粮B(2%尿素)和包被尿素组饲喂日粮C(2%包被尿素).结果表明,与日粮B相比,日粮C使绵羊沉积氮与进食氮、沉积氮与可消化氮的比列显著提高,显著减少绵羊粪氮的排出.和其他日粮相比,日粮C提高了绵羊的沉积氮,但差异不显著.各组进食干物质、进食氮、尿氮及可消化氮间差异不显著:日粮C可显著提高绵羊中性洗涤纤维(NDF)的消化率,干物质消化率、氮表观消化率、酸性洗涤纤维(ADF)和酸不溶灰分(AlA)的利用率差异不显著.结果表明,绵羊日粮中添加2%尿素和2%包被尿素安全可靠,效果明显,其中日粮C对氮利用率效果最好. 相似文献
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试验选取3头24月龄左右,体重相近的健康青年母水牛,采用随机区组试验设计,分别饲喂基础日粮+15 g/d尿素（处理A）、基础日粮+30 g/d尿素（处理B）和基础日粮+45 g/d尿素（处理C）组合的试验日粮。结果表明,随着尿素用量的增加,粗蛋白质采食量明显提高,营养物质的表观消化率、氮沉积率和氮的表观消化率均以处理B组最高,且与其它处理组差异显著(P<0.05);尿中嘌呤衍生物的排出量仍以处理B组最高,与其它组差异不显著(P>0.05);肌酸酐的排出量稳定在40 mmol/d左右,各处理间无显著差异（P>0.05）。由此说明,适量添加尿素有利于青年母水牛营养物质消化率的提高、氮的沉积和微生物氮的合成,而过量添加反而降低其添加效果。 相似文献
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试验选用3头年龄和体质量相近的、健康无病的且安装永久小肠瘘管的延边黄牛,采用3×3拉丁方设计,随机分成3组即对照组(A组)、大相对分子质量单宁组(B组)和小相对分子质量单宁组(C组)。A组饲喂基础日粮,B组饲喂基础日粮+2%大相对分子质量缩合单宁,C组饲喂基础日粮+2%小相对分子质量缩合单宁。在试验期内测定其消化道p H、消化道氮利用及十二指肠食糜氨基酸流量。结果表明:饲喂缩合单宁组的p H都显著升高(P0.05);消化道氮利用分析中,B组的粪氮和尿氮的含量都极显著低于A组(P0.01),B组的沉积氮与A和C组相比差异极显著(P0.01)。十二指肠食糜氨基酸流量分析中,添加缩合单宁显著增加其蛋氨酸(Met)、丙氨酸(Ala)、谷氨酸(Glu)、脯氨酸(Pro)和赖氨酸(Lys)的流量(P0.05),但是除Glu,不同相对分子质量间差异都不显著(P0.05),B组Glu流量显著高于其他组(P0.05)。 相似文献
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《黑龙江畜牧兽医》2017,(18)
为了研究日粮纤维构成对鹅营养物质利用的影响,试验采用完全随机设计,选取17周龄健康、体重相近且性别一致的吉林白鹅30只,随机分为A组、B组和C组,每组10只,分别饲喂由苜蓿、玉米青贮和白菜作为纤维源的三种日粮。结果表明:粗纤维消化率C组极显著低于A组、B组(P0.01),酸性洗涤纤维消化率各组之间差异不显著(P0.05),中性洗涤纤维消化率B组与A组、C组之间差异极显著(P0.01);A组能量表观消化率显著高于B组、C组(P0.05),B组与C组之间差异不显著(P0.05);A组氮的表观沉积率最高,各组间差异不显著(P0.05)。说明鹅对苜蓿的各纤维组分消化率最高,日粮能量利用效率最好,对玉米青贮氮的表观沉积率最好。 相似文献
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《饲料研究》2017,(4)
试验研究不同组合的酶制剂及其与微生态制剂的配伍对仔猪营养物质消化率的影响。将60头体质量(30±2.5)kg的健康仔猪随机分为A、B和C组共3个处理组,每处理组2个重复,每重复10头,其中A组为对照组,饲喂由4.00%仔猪复合预混料与相应推荐配比大原料组成的全价基础日粮;B组在基础日粮中添加300 g/t复合酶制剂(纤维素、木聚糖酶、α-淀粉酶和酸性蛋白酶等);C组在基础日粮中添加300 g/t酶制剂与200 g/t枯草芽孢杆菌。试验期35 d,采用Cr2O3指示剂法,测定仔猪日粮中钙、磷、粗蛋白、粗脂肪和粗纤维等营养物质的消化率。与饲喂基础日粮的对照组相比,B和C组钙消化率分别提高23.89%和26.40%,粗蛋白消化率分别降低13.10%和15.40%,粗纤维消化率分别提高17.50%和16.80%,均差异显著(P0.05)。B和C组磷和粗脂肪消化率高于对照组,但组间差异不显著(P0.05)。在仔猪日粮中添加复合酶制剂及酶制剂与芽孢杆菌配伍组合均能提高仔猪对钙、粗蛋白质和粗纤维的消化率。 相似文献
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本试验通过在中速型黄羽肉鸡上测定构树芽的代谢能值和养分利用率,旨在评定构树芽在中速型黄羽肉鸡上的营养价值。选用60日龄、体重为（1.84±0.48） kg的健康雄性中速型黄羽肉鸡（黄花公鸡）33只,随机分为3组,每组11个重复,每个重复1只鸡。其中,A组为对照组,饲喂基础饲粮;B组为试验组,饲喂待测饲粮（构树芽替代基础饲粮中部分玉米、豆粕和油脂,替代比例为20%）;C组为饥饿内源组。试验为期10 d。采用全收粪法和套算法测定能量代谢指标及养分利用率。结果显示：中速型黄羽肉鸡对构树芽的表观代谢能、真代谢能、氮校正表观代谢能、氮校正真代谢能分别为9.55、10.22、9.33和9.96 MJ/kg,总能代谢率、氮利用率、表观氮沉积率和真氮沉积率分别为44.08%、70.80%、0.64%和0.75%;粗蛋白质、粗脂肪、粗纤维、钙、磷表观利用率分别为70.96%、84.53%、35.58%、59.45%和78.21%,真利用率分别为110.32%、87.91%、26.23%、59.85%和108.17%。由此可知,根据构树芽的有效能量及蛋白质水平,可在中速型黄羽肉鸡饲粮中合理搭配使用。 相似文献
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本试验旨在研究日粮中不同粗纤维水平对育肥后期苏山猪生长性能和胴体性能的影响。选用45头60kg左右苏山猪,随机分成A、B、C组,每组15头,分别采用8.35%,9.10%,11.39%粗纤维水平日粮进行饲喂。试验结束后,每组随机选取5头猪屠宰。结果表明:(1)日粮中粗纤维水平可影响苏山猪生长速度。B组平均日增重高于A组、C组,B组与A组间差异显著(P0.05)。(2)日粮中粗纤维水平可影响苏山猪血液生化指标。B组尿素氮、总胆固醇、高密度脂蛋白显著高于C组(P0.05);C组尿素氮显著高于A组(P0.05)。(3)日粮中粗纤维水平可影响苏山猪屠宰性能。粗纤维水平升高,脂率呈下降趋势;B组、C组肉脂比均显著高于A组(P0.05);B组小肠重量显著低于A组、C组(P0.05);C组的大肠重量显著高于A组、B组(P0.05)。心脏重量A组最高,B组最低,组间差异显著(P0.05);A组肺重量显著高于B组(P0.05)。本试验结果提示,适量提高日粮中粗纤维水平可提高苏山猪生长速度,降低育肥后期苏山猪的脂率,提高肉脂比;同时可影响育肥后期苏山猪小肠、大肠、心脏和肺的发育。 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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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
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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