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本试验旨在研究不同锌源对湘东黑山羊生长性能及羊奶的成分、氨基酸和脂肪酸含量的影响。选取体重(38.1±9.7) kg、胎次相近的21只怀双羔妊娠湘东黑山羊(妊娠日龄在90~100 d),随机分为3组,分别在基础饲粮(锌含量22.00 mg/kg DM)中添加硫酸锌(对照)、蛋氨酸螯合锌、甘氨酸螯合锌,各组锌添加量均为60 mg/kg DM。预试期为7 d,正试期为42 d。正试期3组妊娠母羊分别饲喂不同锌源饲粮,产后母羊饲喂无添加锌源的饲粮,母羊产后15 d采集奶样。结果表明:1)与对照组相比,蛋氨酸螯合锌组和甘氨酸螯合锌组妊娠母羊总增重和平均日增重显著增加(P0.05); 2)与对照组相比,蛋氨酸螯合锌组和甘氨酸螯合锌组羊奶体细胞数量、乳脂、乳蛋白、乳糖、尿素氮、去脂干物质含量差异不显著(P0.05),但蛋氨酸螯合锌组羊奶总干物质含量显著提高(P0.05); 3)与对照组相比,蛋氨酸螯合锌组和甘氨酸螯合锌组羊奶氨基酸含量差异不显著(P0.05); 4)与对照组相比,蛋氨酸螯合锌组羊奶正己酸、辛酸、月桂酸、十三酸、γ-亚麻酸含量显著提高(P0.05),甘氨酸螯合锌组羊奶木蜡酸、顺-11-二十烯酸、γ-亚麻酸含量显著提高(P0.05)。综上所述,蛋氨酸螯合锌可增加羊奶中的总干物质含量,甘氨酸螯合锌可增加羊奶中单不饱和脂肪酸含量,降低多不饱和脂肪酸含量,且均可提高妊娠母羊总增重和平均日增重,说明饲粮中添加蛋氨酸螯合锌和甘氨酸螯合锌均可提高妊娠母羊的生长性能并改变羊奶品质。 相似文献
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蛋氨酸螯合锌对绿头野鸭生产性能的影响 总被引:3,自引:1,他引:2
试验研究蛋氨酸螯合锌对绿头野鸭生长性能及能量和蛋白质代谢的影响,探讨蛋氨酸螯合锌的最佳添加剂量。第Ⅰ组为对照组,添加150mg/kg硫酸锌组;第Ⅱ、Ⅲ组为试验组,分别添加75mg/kg硫酸锌+150mg/kg蛋氨酸螯合锌、300mg/kg蛋氨酸螯合锌。结果表明,各试验组的平均日增重、能量和蛋白质代谢率显著高于对照组(P〈0.05),以4-7周效果最明显;料肉比显著低于对照组;添加75mg/kg硫酸锌+150mg/kg蛋氨酸螯舍锌效果较好。 相似文献
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研究蛋氨酸螯合锌对绿头野鸭免疫器官指数及血液指标的影响,探讨蛋氨酸螯合锌的最佳添加剂量。试验采用单因子完全随机试验设计,供试野鸭54只鸭,分为3个处理组,第Ⅰ组为对照组添加150 mg/kg硫酸锌;第Ⅱ组添加75 mg/kg硫酸锌+150 mg/kg蛋氨酸螯合锌,第Ⅲ组添加300 mg/kg蛋氨酸螯合锌。结果表明:各试验组的免疫器官指数均显著高于对照组;尿素氮水平明显降低,其他血液指标均无明显变化。 相似文献
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本文介绍了蛋氨酸螯合锌的制备方法及其对蛋鹑生产性能的影响。试验结果表明 :获得蛋氨酸螯合锌的最佳条件为 :反应液蛋氨酸浓度为 6.1 2 % ,p H值为 5。运用自制的蛋氨酸螯合锌饲喂蛋鹑 ,将 66只蛋鹑随机分成 3组 ,每组基础日粮相同 , 、 组为试验组 ,分别添加0 .0 2 %的蛋氨酸螯合锌 +0 .0 2 %硫酸锌 ,0 .0 4 %蛋氨酸螯合锌。 组为对照组 ,添加 0 .0 4 %硫酸锌。试验结果表明 :各试验组与对照组相比 ,总产蛋数、总产蛋重及料蛋比均差异显著 (P<0 .0 5) ,平均蛋重及蛋中概略养分各试验组与对照组相比差异不显著 (P>0 .0 5)。 相似文献
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试验采用火焰原子吸收光谱法研究饲料中锌添加水平10、15、30、45、60mg/kg蛋氨酸螯合锌、60mg/kg无机锌对水貂粪便、肾脏、肝脏和胰脏中锌含量的影响。结果表明,添加45mg/kg蛋氨酸螯合锌的水貂肾脏锌含量显著低于饲料中添加30mg/kg蛋氨酸螯合锌处理组和60mg/kg无机锌处理组的(P0.05);同时45mg/kg蛋氨酸螯合锌组粪便锌含量最低,显著低于60mg/kg无机锌处理组(P0.05)。饲料中添加45mg/kg蛋氨酸螯合锌水貂对锌的代谢利用率最高。饲料锌的不同水平添加对肝脏和胰脏锌含量影响差异不显著(P0.05),估计60日龄水貂肝脏和胰脏锌含量的95%置信区间分别为10.98~37.12μg/g和20.09~53.47μg/g。随日粮有机锌添加水平的增加,肾脏湿重呈上升趋势,胰脏湿重呈下降趋势,30mg/kg的添加水平胰脏重和肾脏锌含量均较高。结论:水貂饲料蛋氨酸锌的添加量在30~45mg/kg为宜。 相似文献
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本试验研究蛋氨酸螯合锌对绿头野鸭生长性能及能量和蛋白质代谢的影响,探讨蛋氨酸螯合锌的最佳添加量。试验采用单因子完全随机试验设计,供试绿头野鸭54只,分为3个处理组,每组18只,设3个重复。第Ⅰ组为对照组,添加150 mg/kg硫酸锌;第Ⅱ、Ⅲ组为试验组,分别添加75 mg/kg硫酸锌 150 mg/kg蛋氨酸螯合锌3、00 mg/kg蛋氨酸螯合锌。试验期为8周,采用3层立体笼养,每周进行称重、称料,通过饲养试验、代谢试验,测定绿头野鸭生长率、耗料量及营养物质的代谢率。研究结果表明,各试验组的平均日增重显著高于对照组(P<0.05),分别提高了12.13%、11.96%,以4~7周效果最明显;能量和蛋白质代谢率均显著高于对照组(P<0.05);料肉比显著低于对照组;从试验的总体效果看,添加75 mg/kg硫酸锌 150 mg/kg蛋氨酸螯合锌效果较好。因此,提倡蛋氨酸螯合锌与硫酸锌混合饲喂绿头野鸭效果好,成本低,建议推广使用。 相似文献
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试验旨在研究不同水平有机铜、有机锌对肉鸭生长性能、组织器官铜、锌、铁含量和血清抗氧化指标的影响。试验采用3×3完全随机试验设计,选用1 080只1日龄樱桃谷肉鸭,随机分为9组,每组6个重复,每个重复20只,试验期为42 d。基础日粮为不额外添加铜、锌,试验组分别在基础日粮中添加12、24和36 mg/kg的蛋氨酸螯合铜(以铜元素计)和24、48和72 mg/kg的蛋氨酸螯合锌(以锌元素计)。结果显示:72 mg/kg蛋氨酸螯合锌组肉鸭1~21日龄日增重显著高于添加48 mg/kg蛋氨酸锌组(P<0.05);饲粮添加铜可显著提高肉鸭血清铜水平(P<0.05);饲粮添加铜和锌对肉鸭血清超氧化物歧化酶(SOD)活性和铜锌超氧化物歧化酶(CuZn-SOD)活性具有显著影响(P<0.05)。研究表明,饲粮以蛋氨酸螯合锌形式添加72 mg/kg锌可提高1~21日龄肉鸭日增重,以蛋氨酸螯合铜形式添加36 mg/kg铜可提高肉鸭血清SOD活性。 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