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饲料中添加蛋氨酸螯合锌、锰对肉用仔鸡生产性能的影响 总被引：1，自引：0，他引：1
试验研究了日粮添加羟基酸螯合锌、锰代替无机锌、锰对肉用仔鸡生产性能影响。试验结果表明，以微量元素氨基酸螯合物代替无机盐可显著提高肉用仔鸡的生长速度和饲料转化率，改善肉鸡的健康状况，提高养殖的经济效益。 相似文献
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肉肝渣代替鱼粉可提高肉鸡经济效益河南农业大学畜牧系卢中华，林栋康，张松槐河南省农业科学院畜牧所张淑环，田金如为了充分开发和利用国内蛋白质饲料资源，提高养鸡经济效益，我们利用肉肝渣代替进口鱼粉饲喂肉用仔鸡，肉用仔鸡增重快、肉质细嫩，试验效果显著。现将试... 相似文献
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试验选用1日龄Arbor Acres(AA)商品肉用仔鸡180只,随机分为6组,每组30只.采用2×3因子设计,选用0.75%,1.25%两个钙水平;0、50、100 mg/kg三个锌水平(以Zn计,蛋氨酸形式);研究不同锌、钙水平对肉用仔鸡屠宰性能的影响.结果表明,不同的钙水平下,蛋氨酸锌不同水平对肉用仔鸡屠宰性无显著影响(P>0.05),但有改善胫骨长宽比的趋势.不同的饲粮钙水平对屠宰性能各项指标亦无显著影响(P>0.05). 相似文献
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肉用仔鸡日粮中添加蛋氨酸铜、锌和锰对粪便微量元素排放的研究 总被引：1，自引：0，他引：1
为了比较肉用仔鸡日粮中添加不同有机微量元素后粪便中铜、锰、锌、排放的影响,试验选择1日龄AA肉仔鸡,分为7个处理,对照组添加无机硫酸盐(锌50mg/kg;铜10mg/kg;锰50 mg/kg),试验组分别用Mintrex-Cu替代5 mg/kg或全部替代硫酸铜;以Min-trex-Zn代替20 mg/kg硫酸锌,以Mintrex-Mn代替20 mg/kg硫酸锰,或在对照组基础上添加20mg/kg的Mintrex-Mn或Mintrex-Zn.42日龄时,采用全收粪法收集粪样72h,用原子吸收分光光度计测定粪样中铜、锰、锌的含量.结果表明:Mintrex-Cu代替50%或100%硫酸铜,对粪便中铜、锌和锰的排泄量没有显著影响(P＞0.05),Mintrex-Zn/Mn替代40%无机锌、锰对锌、锰排泄量没有显著影响(P＞0.05).在基础日粮中额外添加20mg/kgMintrex-Zn/Mn显著提高了粪便中锌、锰的排泄量(P＜0.05),但添加20mg/kgMintrex-Mn降低铜排泄量20%以上(P＜0.05).研究说明,在基础日粮微量元素水平低于需要量的情况下,采用有机微量元素替代无机微量元素对粪便中微量元素排泄量的影响很小,额外添加有机微量元素则提高粪便微量元素的排泄. 相似文献
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用一日龄 Arbor Acres 肉用仔鸡(公母各半)进行两个饲养试验,测定不同无机锰添加水平对肉用仔鸡肝、胰、肾、心、脾、肌肉和骨中钙、磷、镁、铜、铁和锌浓度的影响。试验1的玉米—豆饼基础饲粮含锰18毫克/千克,分别添加锰0、32、72、112、262和2822毫克/千克;试验2的相同基础饲粮含锰16毫克/千克,分别添加锰0、20、40、60、80、100、120和140毫克/千克。笼养28天。结果表明,在实用基础饲粮中添加20—262毫克/千克锰时,可提高胰和肾锌(P<0.05或0.01)及肝铜(P>0.05)的浓度,但不同添加水平间无明显差异(P>0.05)。添加水平达2822毫克/千克,增加肝铜(P<0.01)而降低骨灰镁浓度(P<0.05或0.01)。组织钙、磷、和铁的浓度无明显变化(P>0.05)。 相似文献
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饲养试验结束后从试验鸡群中选用24只42日龄体重均匀、健康的从肉鸡,分为6个组,每组4只,单笼圈养.用氨基酸螯合锌、锰分别替代基础饲粮中添加的相应无机元素水平的0%、20%、40%、60%、80%和100%,6个处理组中Zn、Mn的含量和其它营养指标保持完全一致.采用常规分析法,测定日粮和鸡粪中干物质、粗蛋白、粗脂肪、粗灰分、钙、磷、锌和锰.研究不同水平下有机微量元素对这些营养物质和矿物质表观代谢的影响.试验结果表明:3D复合氨基酸螯合锌、锰可不同程度提高肉仔鸡对饲料中各种营养物质的表现消化率和矿物质的沉积率.从这个试验的各项指标综合考虑,肉仔鸡饲料中3D复合氨基酸螯合锌、锰替代相应无机微量元素的适宜比例为60%. 相似文献
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蛋氨酸锌与钙水平对肉用仔鸡生理生化指标的影响 总被引：2，自引：0，他引：2
锌（Ｚｎ）对肉用仔鸡具有重要的营养生理作用，而钙（Ｃａ）是肉用仔鸡吸收利用Ｚｎ的一个重要影响因素，尤其高Ｃａ会显著降低Ｚｎ在组织中的沉积。过去Ｚｎ与Ｃａ相互关系的研究多限于无机Ｚｎ，至于有机Ｚｎ与Ｃａ的相互关系研究尚少。本试验的目的在于，根据生理生化指标研究不同蛋氨酸锌（Ｍｅｔ－Ｚｎ）与Ｃａ水平对肉用仔鸡的影响，为肉用仔鸡实用日粮中Ｍｅｔ－Ｚｎ、Ｃａ水平提供科学依据。１ 材料与方法１．１ 试验方案 试验采用２×３因子设计，选用０．７５％、１．２５％两个Ｃａ水平，Ｍｅｔ－Ｚｎ分别取三个水平：０、５０… 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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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