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本试验旨在研究饲粮添加低聚木糖水平对1~21日龄和22~42日龄爱拔益加(AA)肉仔鸡生长性能、血液生理和血浆生化指标、器官发育和组织病理学变化的影响,从而评价低聚木糖对肉仔鸡饲用的生物安全性。试验采用单因子完全随机设计。选用240只1日龄AA肉仔鸡,随机分为4个组(每个组6个重复,每个重复10只鸡,公、母各5只),分别饲喂低聚木糖添加量为0、160、800和1 600 mg/kg的试验饲粮。试验期为42 d。结果表明,饲粮添加1 600 mg/kg低聚木糖显著提高21日龄肉仔鸡血浆球蛋白浓度和42日龄肉仔鸡血浆葡萄糖浓度(P0.05),显著降低21日龄肉仔鸡血浆磷酸肌酸激酶和谷丙转氨酶活性以及42日龄肉仔鸡血浆甘油三酯浓度(P0.05);800 mg/kg添加组42日龄肉仔鸡肾脏相对重量显著高于对照组和1 600 mg/kg添加组(P0.05)。以上结果表明,肉仔鸡玉米-豆粕型饲粮中低聚木糖的最高添加限量定为160 mg/kg,具有10倍的安全系数,对肉仔鸡饲用是安全的。 相似文献
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本试验旨在研究饲粮添加胍基乙酸(GAA)对爱拔益加(AA)肉仔鸡生长性能、血液学指标、脏器指数、组织同型半胱氨酸含量以及组织形态的影响,以系统评价AA肉仔鸡对GAA的耐受性。试验选用540只1日龄AA肉仔鸡公雏,随机分为5个组,每组6个重复,每个重复18只鸡。5组试鸡分别饲喂在基础饲粮中添加0、800、1 600、4 000和8 000 mg/kg GAA的饲粮。试验期42 d,分为前期(1~21日龄)和后期(22~42日龄)2个阶段。结果表明:与对照组相比,饲粮添加800~4 000 mg/kg GAA显著提高了肉仔鸡前期、后期和全期平均日增重(P0.05),显著降低其后期和全期料重比(P0.05),但对各期平均日采食量均无显著影响(P0.05)。饲粮添加8 000 mg/kg GAA组的平均日增重、平均日采食量和料重比与对照组相比差异不显著(P0.05)。饲粮添加800~8 000 mg/kg GAA对21、42日龄肉仔鸡血常规指标、血清生化指标、脏器指数和组织同型半胱氨酸含量均无显著影响(P0.05)。饲粮添加4 000、8 000 mg/kg GAA对肉仔鸡肝脏和肾脏组织形态无不良影响。由此可见,肉仔鸡饲粮中添加GAA对其生长性能、血液学指标、脏器指数、组织同型半胱氨酸含量和组织形态无不良影响,肉仔鸡可耐受8 000 mg/kg GAA。 相似文献
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试验选用1日龄AA肉仔鸡240只,随机分为3个处理组,每个处理组4个重复,每个重复20只。三个处理组分别饮清水、乳酸杆菌菌液和产木聚糖酶乳酸菌菌液。通过测定肉仔鸡增重、采食量、料肉比、血液生化指标和免疫器官指数,研究产木聚糖酶乳酸杆菌对肉仔鸡生产性能及免疫功能的影响。结果表明,在试验前、后期通过饮水添加产木聚糖酶乳酸杆菌对肉仔鸡生产性能无显著影响(P0.05),但可显著提高法氏囊指数(P0.05)。添加产木聚糖酶乳酸杆菌对肉仔鸡可显著提高血清中球蛋白和葡糖糖水平(P0.05),显著降低肉仔鸡生长前期血清中尿素、总胆固醇、甘油三酯水平(P0.05)。通过在饮水中添加产木聚糖酶乳酸杆菌可改善肉仔鸡机体免疫水平,但对肉仔鸡生产性能无显著影响。 相似文献
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香菇多糖对肉仔鸡生产性能和部分免疫指标的影响 总被引：1，自引：0，他引：1
《黑龙江畜牧兽医》2017,(14)
为了研究香菇多糖对肉仔鸡生产性能与免疫器官的影响,试验选择1日龄AA+肉仔鸡200只,随机分成4组,每组设5个重复,每个重复10只。对照组、低剂量组、中剂量组和高剂量组肉仔鸡分别饲喂含香菇多糖0 mg/kg、200 mg/kg、350 mg/kg和500 mg/kg的日粮,进行为期35 d的饲养试验。结果表明:在肉仔鸡的日粮中添加香菇多糖后,在14~21日龄、21~28日龄、28~35日龄时,低剂量组、中剂量组、高剂量组肉仔鸡的平均日增重均显著高于对照组(P0.05);在21~28日龄、28~35日龄时,低剂量组、中剂量组和高剂量组的料重比均显著低于对照组(P0.05);在35日龄时,低剂量组、中剂量组和高剂量组肉仔鸡的免疫器官指数均显著高于对照组(P0.05)。说明在肉仔鸡的日粮中添加香菇多糖对肉仔鸡的生产性能有促进作用,亦可以提高肉仔鸡的免疫器官指数,以香菇多糖添加量为350 mg/kg时效果最佳。 相似文献
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《饲料研究》2016,(17)
试验旨在研究胍基乙酸对AA肉仔鸡生长性能和经济效益的影响。试验一选用432只1日龄商品代AA肉仔鸡公雏,随机分为4个处理组,每组6个重复,每重复18只,试验期42 d。对照组饲喂基础日粮,其余3个处理组分别在基础日粮中添加200、400和600 mg/kg胍基乙酸。结果表明,日粮中添加600 mg/kg胍基乙酸可显著提高肉仔鸡平均日增质量和降低其生长全期料重比(P005)。试验二选用3万只1日龄AA肉仔鸡,随机分为2个处理组。对照组饲喂基础日粮,试验组在基础日粮中添加600 mg/kg胍基乙酸,试验期43 d。结果表明,与对照组相比试验组平均日增质量提高930 g,料重比降低011,造肉成本降低018元/kg,成活率提高128%及欧益指数提高7471。综上所述,胍基乙酸能有效改善AA肉仔鸡生长性能,提高肉仔鸡养殖经济效益。 相似文献
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《动物营养学报》2015,(11)
本试验旨在研究高粱饲粮中添加复合酶制剂对爱拔益加(AA)肉仔鸡生长性能、表观代谢能、蛋白质表观消化率和血清生化指标的影响。选取1日龄AA肉仔鸡1 200只,随机分为6个组,每个组10个重复,每个重复20只鸡。对照组饲喂基础饲粮(1~21日龄含8%高粱,22~35日龄含15%高粱),试验组分别饲喂添加不同高粱专用酶组合(复合酶制剂A、B、C、D和E)的基础饲粮,试验期35 d。结果表明,与对照组相比,复合酶制剂B能显著提高肉仔鸡的平均体重(P0.05),显著提高肉仔鸡的欧洲综合指数(EPI)(P0.05),改善了肉仔鸡的成活率和料重比(P0.05),提高了饲粮表观代谢能和蛋白质表观消化率(P0.05);各复合酶制剂对肉仔鸡血清生化指标未产生显著影响(P0.05)。综合各项测定指标,在本试验条件下,高粱饲粮中添加复合酶制剂能改善肉仔鸡的生长性能;结合复合酶的酶谱表明,复配高粱酶制剂时应该考虑提高果胶酶和蛋白酶的配比。 相似文献
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试验旨在研究饲粮添加发酵酒糟对肉仔鸡生产性能和肠道健康的影响。选取体况相近的1日龄AA雄性肉仔鸡440只,分为5个处理,每个处理8个重复,每个重复11只鸡。处理一为对照组,饲喂基础饲粮,其他处理为试验组,分别饲喂添加2.5%低纤维发酵酒糟,5%低纤维发酵酒糟,2.5%高纤维发酵酒糟和5%高纤维发酵酒糟的试验饲粮。试验期共35 d。结果表明:饲粮中添加发酵酒糟的试验组肉仔鸡的出栏重和欧洲效益指数都高于对照组,死淘率低于对照组(P0.05),1~21日龄添加低纤维发酵酒糟能显著降低饲料增重比(P0.05),22~35日龄阶段2.5%高纤维发酵酒糟添加组的采食量显著高于对照组(P0.05)。饲粮添加发酵酒糟还能增加肉仔鸡空肠的乳酸杆菌和双歧杆菌数量(P0.1)。综上,饲粮中添加发酵酒糟能改善肉仔鸡的生产性能,促进肠道健康。 相似文献
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本试验旨在研究饲粮添加不同水平酵母硒对爱拔益加(AA)肉仔鸡生长性能、血液血红蛋白含量和红细胞压积、血浆生化指标、器官指数和组织结构变化的影响,进而评价酵母硒对肉仔鸡的生物安全性。试验采用单因子完全随机设计,选用288只1日龄AA肉仔鸡,随机分为4个组,每个组6个重复,每个重复12只鸡(公母各占1/2)。各组分别在玉米-豆粕型基础饲粮中添加0、0.4、2.4和4.9 mg/kg(以硒计)的酵母硒试验。试验期为42 d。结果表明:1)与对照组相比,饲粮添加0.4和2.4 mg/kg酵母硒显著提高了22~42日龄肉仔鸡平均日采食量(P0.05);饲粮添加0.4、2.4和4.9 mg/kg酵母硒显著提高了1~42日龄肉仔鸡平均日增重(P0.05),而各酵母硒添加组之间差异不显著(P0.05)。2)饲粮添加不同水平酵母硒除对21日龄肉仔鸡血浆尿素氮含量和谷胱甘肽过氧化物酶(GSH-Px)活性以及42日龄肉仔鸡血浆GSH-Px活性有显著影响(P0.05)外,对其他血浆生化指标均无显著影响(P0.05)。与对照组相比,各酵母硒添加组21和42日龄肉仔鸡血浆GSH-Px活性随着酵母硒添加水平的增加均显著提高(P0.05),且饲粮添加2.4 mg/kg酵母硒显著降低了21日龄肉仔鸡血浆尿素氮含量(P0.05)。3)饲粮添加不同水平酵母硒对21和42日龄肉仔鸡血液血红蛋白含量和红细胞压积及42日龄肉仔鸡器官指数均无显著影响(P0.05),且并未引起主要器官的组织结构变化。综上所述,肉仔鸡饲粮中酵母硒的添加水平为0.4 mg/kg(饲粮中总硒含量为0.41 mg/kg)时,具有10倍的安全系数,即饲粮中以酵母硒形式添加硒对肉仔鸡是安全的。 相似文献
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芽孢乳杆菌对肉仔鸡生产性能、肠道发育和微生物菌群的影响 总被引：1，自引：0，他引：1
本试验旨在研究不同水平芽孢乳杆菌对内仔鸡生产性能、肠道发育及微生物菌群的影响.选取1日龄爱拔益加(AA)肉仔鸡2 400只,随机分为4组(每组6个重复,每个重复100只):对照组饲喂基础饲粮,试验组饲喂分别添加200、100和50 mg/kg芽孢乳杆菌的试验饲粮,试验期42 d.结果表明:1)饲粮添加200 mg/kg... 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