添加不同剂量复合酶制剂对羔羊增重效果的影响

将复合酶制剂添加到羔羊饲料中，观察其对羔羊生长发育所产生的作用。由于青海省特殊地理位置，小麦、青稞资源丰富，因此日粮配方多是利用小麦、青稞、菜籽饼为主要原料，但非淀粉多糖(non-starch polysacharides，NSP)含量高，营养物质利用率低。为消除NSP对畜禽消化吸收的影响，并改善麦类的饲用价值，试验通过育肥羊饲料中添加复合酶制剂，观察其对羔羊生长性能的影响，以选择出复合酶制剂在羔羊饲料中的最佳添加剂量。     

纤维素复合酶添加秸秆中饲喂绵羊效果试验

<正>饲草紧缺已成为制约当地畜牧业发展的关键因素。如何充分利用当地现有的饲草资源,挖掘农作物秸秆的潜力,发展节粮型畜牧业,已成为解决该问题的唯一有效途径。在饲草资源极度缺乏的农区,用纤维素复合酶处理农作物秸秆饲喂绵羊效果研究具有一定的推广应用价值。     

添加复合酶制剂对育肥牛增重效果的影响

选择30头18月龄的西门塔尔牛×本地黄牛的杂种一代阉牛,随机分为试验组和对照组,每组15头。对照组饲喂基础日粮,试验组在基础日粮中添加0．2％复合酶制剂,育肥91d,结果表明;对照组与试验组牛头均分别增重62．70kg,84．80kg,两组差异极显著（P〈0．01）,试验组较对照组头均多增重22．1kg,头均每天可增收2．39元,经济效益显著。     

饲料中添加铜对绵羊增重的影响

将60只羊随机分为3个组,在每千克饲料中分别添加5mg、10mg、15mg的微量元素铜。同一微量元素在不同梯度间进行组间对照。结果表明,日粮中添加10mg的微量元素铜,在提高日增重(P<0.05)及增加经济效益方面效果极佳。     

活体蚯蚓不同添加量对土鸡增重效果的影响

利用经过发酵后的猪粪养殖蚯蚓,再以活体蚯蚓的形式添加到土鸡的日粮中,试验结果显示:试验组与对照组的鸡增重差异不显著,但试验组的饲料成本降低了22%～33%。     

日粮中添加不同剂量半胱胺对绵羊增重效果的影响

选用48只体重相近(20.38 kg±2.15 kg)、健康无病的小尾寒羊,平均分为4组,分别向基础日粮中添加0、7.5、15、22.5 mg/kgBW的半胱胺(CS),进行为期60天的试验.结果表明在一定的时间内,每天添加适宜剂量的半胱胺可以促进绵羊的生长.以添加7.5 mg/kgBW的半胱胺在促进绵羊生长,提高采食量和饲料转化效率方面效果最佳.随着剂量的升高和时间的延长,促生长作用减弱.日粮添加22.5 mg/kgBW的半胱胺显著降低绵羊的采食量(P＜0.05),对饲料转化效率没有显著影响.     

绵羊日粮添加纤维复合酶对瘤胃代谢的影响

研究在玉米秸秆日粮中添加纤维复合酶对绵羊瘤胃代谢的影响。结果发现,在玉米秸秆日粮中添加外源纤维复合酶,使瘤胃液挥发性脂肪酸(VFA)质量浓度显著提高,pH显著下降;提高瘤胃内纤维物质消化率。     

复合纤维素酶不同添加量对阉牛增重效果观察

本试验以３０头草原红牛杂种阉牛为研究对象，随枘发３组，每组１０头。试验期在３组日粮基础上，研究了日粮添加０．１％、０．１５％及０．２％三种水平的复合纤维酶对阉牛增重的影响。结果，０．１％、０．１５％和０．２％三组平均日增重分别为７４８ｇ、７９９ｇ和８０６ｇ。试验结果表明：在此日粮水平基础上，复合纤维素酶以０．２％的添加量对阉牛的增重效果最好。     

日粮中添加不同剂量葡萄渣对成年羊增重效果的影响

选择28只健康无病、体重相近(P>0.05)的小尾寒羊成年母羊,分为试验Ⅰ组(对照组)、Ⅱ组、Ⅲ组和试验Ⅳ组,在相同的饲养管理条件下进行饲养试验,研究在日粮中添加不同剂量(8%、16%、24%)的葡萄渣对成年羊体增重的影响。结果表明:在日粮中添加不同剂量的葡萄渣对成年羊的体增重、平均日增重、饲料转化效率等均有显著影响(P<0.05)。     

不同处理方式的秸秆对舍饲肉羊育肥增重的影响

文章旨在评估不同处理方式的秸秆对舍饲肉羊育肥增重的影响,采用秸秆综合处理技术,对肉羊进行了120?d的饲养试验.结果表明,与放牧组相比,2、3、4组平均末重增加6.48、8.45、10.75?kg,分别增加23.64％、30.84％、39.23％;在只均增重方面分别增加20.36％、31.57％、38.13％;在平均日...     

Effect of dietary potassium on absorption of magnesium and other macroelements in sheep fed different levels of magnesium

Two metabolism trials were conducted with 24 crossbred wether lambs. Two levels of Mg (.1 and .2%) and four levels of K (.6, 1.2, 2.4 and 4.8%) were fed in a 2 x 4 factorial arrangement of treatments. Each trial consisted of a 10-d preliminary period followed by a 10-d collection of feed, feces and urine. Increasing levels of dietary K resulted in a linear increase in fecal Mg excretion and a linear decrease in Mg absorption. A large depression in Mg absorption occurred when K was increased from 1.2 to 2.4% with a further decrease when K was increased to 4.8%. Lambs fed the high level of Mg (.2%) absorbed and retained more (P less than .05) total Mg (g/d, but not percentage of intake) compared with the low magnesium level (.1%). Dietary Mg did not affect the amount of K excreted, absorbed or retained. Increasing the level of dietary K resulted in a linear increase in urinary, fecal and total K excreted, absorbed and retained (P less than .05).     

Terpenes transfer to milk and cheese after oral administration to sheep fed indoors

Terpenes have been proposed as potential biomarkers in verifying the diets of grazing animals. A study of the relationships between the intake of terpenes and their presence in animal tissues (blood and milk) as well as in the final product (cheese) was conducted. Eight dairy sheep were divided into two equal groups, representing control (C) and treatment group (T). In T group oral administration of a mixture of terpenes, α-pinene, limonene and β-caryophyllene, was applied over a period of 18 days. Blood and milk samples were collected regularly and terpenes were identified by extraction using petroleum ether and the solid phase micro-extraction (SPME) method, respectively, followed by GC-MS analysis. Cheese was produced, from C and T animals separately, twice during the period of terpenes oral administration. Terpenes contents and chemical properties of the produced cheeses were investigated. Limonene and α-pinene were found in all blood and milk samples of the T group after a lag-phase of 2 days, while β-caryophyllene was detected in few plasma samples and in all milk samples. None of the terpenes was traced in blood and milk of C animals. The contents of cheese, in dosed terpenes, presented a more complicated pattern suggesting terpenes non-credible as biomarkers. We conclude terpenes can be used as biomarkers for authentification of ewes' milk, but further research is required on factors affecting their transfer to dairy products from grazing diets.     

体外产气法研究不同钾水平日粮对绵羊瘤胃发酵的影响

<正>近年来通过调控瘤胃发酵来提高反刍动物饲料转化率及生产性能一直是反刍动物营养研究的重点之一。钾对瘤胃微生物的生长以及瘤胃发酵都是必需的,不同钾水平的日粮在很大程度上影响了瘤胃发酵模式及动物的生产性能。20世纪90年代初以来,体外产气法由于能够较好地模拟瘤胃中的发酵历程和     

Effect of heat stress on the behavioral and physiological patterns of Small-tail Han sheep housed indoors

Tropical Animal Health and Production - This study was conducted to investigate the effects of heat stress on the behavioral and physiological patterns in Small-tail Han sheep housed indoors in...     

不同精料补饲水平对藏绵羊瘤胃内环境参数的影响

选择1.2岁左右藏绵羊30只,随机分3组,采用单因子分组设计,以青干草为基础日粮,按每只150,300,450 g/d 3种精料水平补饲,研究不同精料补饲水平对藏绵羊瘤胃代谢参数变化规律的影响。结果表明;随精料补饲水平提高,藏绵羊瘤胃液pH值下降,NH3-N浓度、NH3-N浓度平均值、总挥发性脂肪酸(VFA)浓度显著增加(P<0.05)。在本试验条件下,从藏绵羊瘤胃内环境的稳定方面考虑,藏绵羊每日补饲精料300 g效果最佳。