共查询到20条相似文献，搜索用时 93 毫秒
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本试验旨在研究饲粮椰子粕和复合酶添加水平对蛋鸭生产性能、蛋品质、血浆生化指标及卵巢发育指标的影响,为椰子粕在蛋鸭饲粮中的合理应用提供参考依据。试验1：选择24周龄、体重接近的健康的山麻鸭种公鸭24只,随机分为2组,每组4个重复,每个重复3只鸭。禁饲36 h后,强饲代谢饲粮（50%椰子粕+50%玉米淀粉）和无氮饲粮（玉米淀粉）,测定椰子粕表观代谢能、蛋白质表观利用率和氨基酸真利用率。试验2：选择健康、体重接近的福建龙岩麻鸭母鸭576只,随机分为8组,每组6个重复,每个重复12只。采用2×4双因子完全随机试验设计,利用试验1椰子粕氨基酸真利用率配制试验饲粮,椰子粕添加水平分别为0、6%、12%、18%,复合酶添加水平分别为0和400 mg/kg。试验期16周。结果表明：1）椰子粕表观代谢能为9.29 MJ/kg,蛋白质表观利用率为30.13%,氨基酸真可利用率在45.58%～87.95%。2）饲粮椰子粕添加水平为6%和12%时蛋鸭产蛋率、日产蛋重显著高于饲粮椰子粕添加水平为0时（P<0.05）,料蛋比显著低于饲粮椰子粕添加水平为0时（P<0.05）。饲粮复合酶添加水平对蛋鸭生产... 相似文献
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为研究在饲料中添加不同比例的紫花苜蓿提取物对长毛兔生长性能、养分表观消化率及毛皮质量的影响,采用单因素随机设计试验,选择体重相近的安哥拉兔60只,随机分成4组,每组3个重复,每个重复5只,1组饲喂基础日粮为对照组,试验2、3、4组在基础日粮中分别添加1.0％、2.0％、3.0％紫花苜蓿提取物,预试验7 d,试验期35 ... 相似文献
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《中国畜牧兽医文摘》2012,(10)
<正>本试验选用健康1日龄AA肉仔鸡144只,随机分为3个处理组,每组4个重复,每重复12只,分别饲喂3种不同日粮组。第1组为对照组饲喂基础日粮,第2,3组分别在基础日粮中添加1%的果寡糖和黄霉素4mg/kg。通过饲养试验、肠道菌群培养和血液IgG抗体水平测定,研究果寡糖替代抗生素对肉仔鸡生产性能、肠道菌 相似文献
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做肉仔鸡的生长试验，用L-赖氨酸盐酸盐和L-赖氨酸硫酸盐添加于含不同水平双低莱粕（canola meal）日粮中以比较其生物学效价。共价1440只1日龄的母哈巴德（HUBBARD）肉仔鸡被随机分配于6个日粮处理组，每个处理4个重复，每个重复60只。 相似文献
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蚯蚓抗菌肽对贵州黄鸡生产性能的影响研究 总被引：1，自引：0，他引：1
为了考察蚯蚓抗菌肽对贵州黄鸡生产性能的影响,试验采用单因素试验设计,共设4个抗菌肽添加水平,分别是0%、0.6%、0.8%和1.0%。选用0日龄健康贵州黄鸡120只,根据体重随机分为4组,分别为对照组和试验Ⅰ、Ⅱ、Ⅲ组,每组分别设3个重复,每个重复10只鸡。试验期21 d。试验结果表明:日粮中添加抗菌肽对贵州黄鸡的采食量无显著影响(P>0.05),但显著提高日均增重(P<0.05),降低料重比(P<0.05),降低发病率和死亡率(P<0.05),以添加1%水平的蚯蚓抗菌肽效果为佳。 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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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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Billinghurst RC Brama PA van Weeren PR Knowlton MS McIlwraith CW 《American journal of veterinary research》2004,65(2):143-150
OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis. 相似文献