共查询到20条相似文献，搜索用时 109 毫秒
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试验旨在探讨饲粮添加不同水平的生姜粉对蛋鸡生产性能和蛋品质的影响。选取27周龄罗曼褐壳蛋鸡120只,随机分为4组,每组设3个重复,每个重复10只。对照组饲喂基础饲粮,试验组分别添加0.5%、1.0%、1.5%的生姜粉。预饲期7 d,试验期4周。结果表明:饲粮中添加适量的生姜粉可以提高蛋鸡的平均日产蛋量和试验3~4周的产蛋率以及试验1~2周的平均蛋重(P<0.05)。饲粮中添加适量生姜粉能够提高鸡蛋的哈夫单位和蛋比重(P<0.05)。结果提示,饲粮中添加生姜粉可提高罗曼褐壳蛋鸡的生产性能和蛋品质,以1.0%生姜粉为最适添加量。 相似文献
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桑叶粉对蛋鸡生产性能及蛋品质的影响研究 总被引：1，自引：0，他引：1
选用240只330日龄的健康罗曼商品蛋鸡,随机分为5个组,每组3个重复,每个重复16只。5组蛋鸡饲喂5种日粮,对照组饲喂基础日粮,其他处理组在基础日粮的基础上分别添加2%、4%、6%和8%的桑叶粉形成的试验日粮,试验期5周,研究桑叶粉对蛋鸡生产性能和蛋品质的影响。试验结果表明：在蛋鸡日粮中添加桑叶粉能降低蛋鸡每日的采食... 相似文献
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本试验旨在研究日粮添加不同水平的大蒜粉对蛋鸡产蛋性能的影响。选取45周龄体重相近的海兰褐蛋鸡1 600只,随机分为4组,每组5个重复,每个重复80只。对照组饲喂基础日粮,其他3个试验组分别在基础日粮中添加1.0%、3.0%及5.0%剂量的大蒜粉,预饲期5 d,正试期30 d,每10天为1个阶段,分3个阶段。结果表明:各试验组的产蛋率、平均日采食量和平均蛋重显著高于对照组(P0.05),其中试验Ⅲ组产蛋性能效果最好。结果提示,在日粮中添加大蒜粉可以提高蛋鸡的产蛋性能,其中以添加5%大蒜粉效果最理想。 相似文献
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《养殖与饲料．饲料世界》2020,(3)
试验选取270羽60周龄的蛋鸡,随机分为3个处理,每个处理6个重复,每个重复15羽,以期研究在蛋鸡日粮中添加芽孢杆菌蛋白酶制剂对蛋鸡生产性能的影响。对照组饲喂基础饲粮,2个试验组分别在基础饲粮中添加饲喂芽孢杆菌蛋白酶制剂1号和芽孢杆菌蛋白酶制剂2号,试验结果显示,添加芽孢杆菌蛋白酶制剂组可提高蛋鸡的平均日采食量。 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