共查询到20条相似文献，搜索用时 62 毫秒
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骆宏机 《畜牧兽医科技信息》2014,(3):26-30
本试验旨在研究在生长育肥猪日粮中添加小麦替代玉米,对猪的生长性能、养分消化率的影响,并对其经济效益进行分析,探讨适宜的替代量。试验选用平均体重为30.12±1.28kg的（杜×长×大）三元杂交猪150头,随机分成5组,每组10头×3个重复。Ⅰ组为对照组,饲喂玉米-豆粕型基础饲粮;试验Ⅱ、Ⅲ、Ⅳ、Ⅴ组为小麦替代组,用小麦分别替代基础日粮中25%、50%、75%和100%的玉米,并在其中分别添加0.015%、0.020%、0.025%和0.030%的复合酶制剂（阿拉伯木聚糖酶、β-葡聚糖酶、木聚糖酶等）。试验期67天,其中预饲期7天,正试期60天。结果表明用小麦替代适当比例的玉米对生长猪的生产性能无影响,具有一定可行性;同时在添加复合酶制剂的情况下,小麦等量替代50%的玉米养殖效果最佳。 相似文献
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《饲料工业》2017,(21)
试验旨在筛选出膨化大豆在生长育肥猪日粮中替代豆粕的最适添加量。试验选用胎次相近、健康的"杜×长×大"三元猪80头[公母各半,平均体重为(35.83±5.07)kg],按照体重相近、公母各半的原则随机分为4个试验组,每组5个重复,每个重复4头猪。对照组饲喂玉米-豆粕型基础日粮,试验组日粮分别用10%、30%和50%的膨化大豆等量替代对照组日粮中的豆粕和豆油,研究日粮中使用膨化大豆替代豆粕对颗粒饲料加工质量的影响及对生长育肥猪生长性能的影响。试验结果表明:与对照组相比,日粮中膨化大豆等量替代豆粕+豆油可提高生长猪的生长性能,但对颗粒饲料加工质量和育肥猪的生长性能均无显著影响。生长猪可通过日粮中添加膨化大豆替代豆粕来提高其生长性能。 相似文献
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本试验使用两种抗菌肽、植物精油、微生态制剂共4种产品替代抗生素,配制断奶仔猪教槽料日粮,考察不同产品对断奶仔猪生长性能及腹泻率的影响。试验选用21日龄"杜×长×大"三元杂断奶仔猪150头,随机分为5个处理组,每组3个重复,每个重复10头猪,每个栏为一个重复,公母各半。对照组日粮为基础配方+抗生素处理组,其余4组分别使用抗菌肽A(菌丝霉素)、抗菌肽B、植物精油、微生态制剂替代抗生素,试验期为14天。结果表明,菌丝霉素处理组的平均日增重和平均采食量与抗生素对照组差异不显著,但略高于其他处理组。菌丝霉素处理组的腹泻率在各组中最低,体现了较好的抗腹泻作用。 相似文献
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本试验以育肥猪为研究对象,研究日粮中添加一定比例的苹果渣对其生长性能的影响.试验选择体重相近、健康良好的"杜×长×大"育肥猪40头,按照随机分组原则分成4组,每组2个重复,每个重复包含5头猪.试验预试期7 d,正式周期为30 d.试验结果表明,育肥猪日粮中添加苹果渣可提高其采食量、降低料重比,但与对照组相比差异不显著(... 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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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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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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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 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