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蛋白质水平对牛肉脂肪酸含量的影响 总被引：1，自引：0，他引：1
《养殖与饲料．饲料世界》2010,(12)
研究不同蛋白质水平对育肥肉牛脂肪酸含量的影响。设计5个营养水平的精料补充料配方,分别饲喂5个试验组肉牛,并与不添加精料补充料的对照组进行比较。结果表明:较高粗蛋白质水平有利于某些脂肪酸含量的增加,可以改善牛肉品质,但对肉色和脂肪色无明显影响。 相似文献
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牛羊复合添加剂对放牧绵羊的应用效果 总被引：2，自引：0，他引：2
枯草期选用藏系绵羊成年母羊40只 ,羔羊20只 ,分为二组 ,在放牧条件下 ,一组为试验组 ,补饲含复合添加剂的精料补充料 ,另一组为对照 ,补饲不含复合添加剂的精料补充料 ,进行为期60d的对比试验。结果表明 :成年羊试验组比对照组只均多增重0.46kg ,提高了29.87 % (P<0.05) ,羔羊试验组比对照组只均多增重3.48kg ,提高了43.66 %(P<0.01)。经济效益 :试验组纯收益为317.30元 ,对照组为119.3元 ,试验组比对照组多收益198.00元。每只羊平均收益 :成年羊试验组比对照组只均多收益2.07元 ,羔羊试验组比对照组只均多收益15.66元。表明在精料补充料中添加复合添加剂 ,在放牧绵羊生产中具有推广价值。 相似文献
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本试验选用体重、产奶量、产奶月份、胎次均相近的健康荷斯坦产奶母牛60头，随机分成2组，即对照组和试验组，进行苜蓿草块替代部分精料补充料的饲喂试验。对照组按原日粮饲喂，试验组在原日粮基础上，每5天减精料0.3kg，增加等量的苜蓿草块0．3kg。预试期为10天，试验期35天。从奶牛的产奶量来看，与对照组比较，试验组平均每头牛每天产奶量提高了1.12kg。通过经济效益分析比较，与对照组比较，试验组增加收入2．43元。结果表明，使用苜蓿草块替代部分精料补充料饲喂奶牛是切实可行的。 相似文献
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《饲料工业》2019,(14):11-17
通过饲养试验和消化试验评定精料补充料在湖羊中的饲用价值。选取健康的、体重约22 kg的生长育肥湖羊120只(60♂+60♀),将其分成对照组和试验组,每组60只(30♂+30♀),每组4个重复,每个重复15只。对照组羊日粮为羊场现行的日粮,由大体积性饲料与羊场精料补充料组成;试验组羊日粮由大体积性饲料(和对照组相同)与本试验研制的精料补充料组成;饲养试验周期60 d,消化试验期7 d。结果如下:①与对照组比较,试验组羊平均日增重提高37.95%(P<0.01);对无氮浸出物、粗纤维、粗蛋白质和粗脂肪的消化率分别提高5.10%(P<0.01)、5.38%(P<0.05)、5.83%(P<0.05)和3.07%(P<0.05)。②试验组羊血糖显著高于对照组(P<0.05);血清谷草转氨酶活性极显著低于对照组(P<0.01);其余多数血清生化参数不同程度地优于对照组羊,但差异不显著(P>0.05)。③试验组羊每千克增重所需饲料成本(10.49元/kg)较对照组(13.04元/kg)降低19.56%,净节约饲料成本2.55元。结果表明:自制的精料补充料饲用价值优于羊场精料补充料,为湖羊精补料的开发提供依据。 相似文献
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四季鹅仔鹅放牧条件下不同营养水平精料补饲试验 总被引：7，自引：0，他引：7
探讨四季鹅肉用仔鹅在放牧条件下快速生长的适宜营养水平和精料补饲量,为江苏省丘陵山区发展四季鹅生产提供依据。试验选择4～7日龄四季鹅苗鹅150只,均分为5组,1～4组为试验组,分别补饲不同营养水平的精料,5组为对照组,饲喂农户常用饲料,试验期63天。试验结果表明:在放牧条件下,补饲营养水平较高的精料补充料(ME 11.41MJ/kg,CP 17.67％),仔鹅9周龄体重达3.12kg,日增重47.17g,取得满意的经济效益。本试验补饲的精料中添加了限制性氨基酸(0.2％蛋氮酸,0.1％赖氨酸)和必需矿物元素,也有利于仔鹅生产。 相似文献
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根据肉用羔羊生理特点及营养需要配制营养丰富、安全无副作用的精料补充料。在全舍饲条件下将20只小尾寒羊(3￣4月龄)作为试验组进行饲喂,另20只作为对照组在当地传统方式下进行饲喂。经35d试验,结果表明,全期试验组平均日增重比对照组多111g。每只平均多盈利37.5元。 相似文献
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选择５８只成年梅花鹿，随机分为两组。试验组３８只，在精料补充料中添加 １％的鹿用预混料，并于收获头茬茸时，颈部皮下注射“再生茸生长剂”６ｍｌ；对照组 ２０只，不使用预混料和“再生茸生长剂”。结果表明，试验组三杈茸鲜重比对照组提高１３．４９％（Ｐ〈０．０５），再生茸平均单产提高２２１．０５％（Ｐ〈０．０１）。试验组平均纯增经济效益是增加投入的７．５６倍。 相似文献
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《家畜生态学报》2021,42(8)
为了探究亚麻酸对奶山羊泌乳性能的影响,选取30只生理状态相近的泌乳期西农萨能奶山羊,随机分为3组,每组10只羊,精料补充料中α-亚麻酸添加量分别为0%(对照组)、1%(低亚麻酸组)和2%(高亚麻酸组),各组精料补充料营养成分和能量水平保持相同,正试期8周,测定试验羊血清蛋白质、脂肪、泌乳量及乳成分含量等指标。结果表明:精料补充料中α-亚麻酸可以显著增加奶山羊的采食量(P0.05),但对其平均日产奶量没有显著影响(P0.05)。与对照组相比,试验组奶山羊血清中DHA(二十二碳六烯酸)和EPA(二十碳五烯酸)显著升高(P0.05);试验组羊奶中乳脂、乳糖、蛋白质和总固形物的含量与对照组无显著差异(P0.05),但高亚麻酸组羊奶中DHA含量比对照组和低亚麻酸组显著升高(P0.05)。总之,该研究发现奶山羊精料补充料添加亚麻酸有助于改善羊乳品质。 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