“畜大壮”对黄牛增重效果试验

使用激素或类激素增重剂提高牛肉产量是加快肉牛业生产的一种经济有效的途径。据报道美国、澳大利亚、新西兰等国已广泛采用增重剂,生产的肉牛大部分用其处理过。一般经过增重剂处理的肉牛日增重可提高10～20%,饲料利用率提高6～10%。80年代后我国在这方面也做了     

利用“畜大壮”促进安西牛生长期增重试验

安西黄牛是我国役肉兼用型的优良品种之一。为了充分发挥安西黄牛的肉用生产性能,促进肉牛商品生产,1990年10月至1991年3月,我们利用“畜大壮”埋植技术,对舍饲条件下的生长期安西黄牛进行了促增重试验。旨在探索安西黄牛加速生     

牛耳后皮下埋植畜大壮增重试验观察

为了推广和应用育肥肉牛新技术;掌握肉牛增重剂—畜大壮的使用方法;提高农民养牛经济效益,特搞本试验。现将试验效果简报如下:1 材料和方法1.1 试验牛选择:供试验牛选自龙江县龙兴镇龙兴村许衍伦等十八个养牛农户,饲养管理、体重、发育健康等状况基本相同的48头牛1.2 试验用的畜大壮:由龙江县畜牧局总站提供。该产品系北京市营养源研究所生产,药形状     

“畜大壮”埋植育肥黄牛的效果

一、前言“畜大壮”为牛羊自然促生长剂,是一种间羟基苯酸内酯(Resorcylic Acid Lactone),不属于甾族化合物,更非激素类。它有增加氮沉积,加速合成蛋白质,促进发育和抑制脂肪沉积的作用。为探讨“畜大壮”在我县广大农村常规饲养条件下,对黄牛育肥增重效果,我站于1990年12月12日至1991年3月13日在     

绵羊埋植“畜大壮”增重试验

将北京市营养源研究所研制的“畜大壮”于绵羊耳根后皮下脂肪囊内，经８８天试验，试验组平均每羊增重１２．０８公斤，比对照组多增重２．８４公斤，相对增幅３０．７４％，投入效益比１：１０。     

“畜大壮”对利延杂交牛放牧期增重效果试验

“畜大壮”对利延杂交牛放牧期增重效果试验赵完现，朴永和，金光日，金文雄（吉林省延边农学院，１３３４００）（吉林省龙井市畜牧兽医总站，１３３４００）１前言使用“畜大壮”增重剂是提高牛肉产量加快肉牛业生产的一种有效途径。“畜大壮”是一种促生长剂，即一种间...     

牛羊育肥期埋植“畜大壮”试验

<正> 1 “畜大壮”的性质和作用机理“畜大壮”是北京营养源研究所在联合国计划开发署及国际粮农组织的资助下,吸收国外先进技术,利用基因工程研制成功的一种反刍家畜促生长剂,在国     

“畜大壮”增重剂育肥肉牛试验初报

在当地农户的舍饲条件下，对１８头黑×黄、西×黄杂交阉牛埋植“畜大壮”增重剂进行９０天育肥试验。试验结果：“畜大壮”组平均增重４１．９３ｋｇ，日增重４６６ｇ，比对照组（３４．８５ｋｇ，３８７ｇ）分别多７．０８ｋｇ，７９ｇ，增重率提高２．２５个百分点，头均纯收入增加６４．８０元，经济效益显著，试验结果表明，埋植“畜大壮”育肥肉牛是一面简便易行的实用技术，在肉年各有推广应用价值。     

“畜大壮”和氨化麦秸日粮对黄牛的增重效果

<正> “畜大壮”是一种较新的牛羊促生长剂,它的作用机理在于它能刺激牛羊脑下垂体,使之增加生长激素(SomatotroPhin)的分泌量,改善畜体对饲料的转化率。有增加氮的沉积,加速蛋白质的同化合成和促进生长发育等作用。与美国产品“Ralgro”属同类产品。 它的生理活性成分是α-玉米赤霉醇(Zeranol),Zeranol的化学名称称为间羟基苯酸内酯(Resory1ic-acid Lactones)。由其分子结构,它和性激素     

"兔热散"对兔只增重和血清生化指标的影响

选择60日龄体重相近、临床健康的新西兰肉兔30只(公母各半),进行为期30天的饲养试验,观测日粮中添加0.5%"兔热散"对兔只增重和血清生化指标的影响.结果表明:试验组比对照组平均日增重增加1.91g、提高7.62%(P＜0.05),饲料转化率提高1.98%(P＞0.05),血清葡萄糖、总蛋白、球蛋白、钙含量增加(P＜0.05),尿素、无机磷、钾、钠离子浓度和门冬氨酸氨基转移酶活性变化差异不显著(P＞0.05).说明"兔热散"对缓解兔的热应激和提高日增重,有一定的促进作用.     

"麦松散"对肉牛增重和血清生化指标的影响

为了解“麦松散”的饲用效果,选择10头年龄、体重相近的本地黄牛×西门达尔牛杂交一代公牛,随机分为对照组和试验组,每组各5头。对照组饲喂基础日粮,试验组在基础日粮中每天添加100g的“麦松散”,连续饲喂30d。试验前(0d)和试验结束时(30d),颈静脉采血测定其血清生化指标值。结果表明:试验组牛与对照组相比,平均日增重增加0.053kg、提高7.31%(P<0.05)、血清葡萄糖(Glu)、总蛋白(TP)、总钙(Ca)含量升高(P<0.05);血清尿素(Urea)浓度降低(P<0.05);血清球蛋白(GLOB)、无机磷(P)、钾(K)、钠(Na)离子浓度变化差异不显著(P>0.05)。结论:“麦松散”对肉牛有明显的促生长作用,并能改善其部分血清生化指标值。     

A meta-analysis on effects of supplementing low-quality roughages with foliages from browses and tree fodders on intake and growth in sheep

A meta-analysis of data obtained from previous studies was conducted to understand the responses of foliage supplementation on intakes of basal DM (BDMI) and total DM (TDMI), and daily gain (ADG). Thirty-four published studies containing 223 treatments and 1127 sheep met criteria for inclusion in the meta-analysis. Major predictive variables considered were percentages of foliages in diet (SD), CP in foliages (PS), NDF in foliages (FS), NDF in forages (FB), CP in basal roughages (PB), CP in diet (PD) and foliage CP intake (SPI). TDMI (g/d) increased quadratically (P < 0.001) with increasing PS, FS, SPI (R² = 0.66), PB, SD (R² = 0.58) and PD (R² = 0.73). The maximal response of TDMI were 778 g/d at 42% of SD, 894 g/d at 19.8% PD, 893 g/d at 148 g/d SPI and 749 g/d at 26.4% PS (P < 0.001; R² = 0.58, 0.73, 0.66, and 0.37, respectively). BDMI increased quadratically with increasing SD, PD and PB, but decreased quadratically (P < 0.001) with increasing PS (P < 0.001; R² = 0.07). The breakpoint of BDMI was 570 g/d at 6.58% of PD in the diet (P < 0.001, R² = 0.28). Overall, BDMI responded at very low level of SD in the diet, peaking at 7.6% SD with BDMI of 572 g/d (P < 0.001, R² = 0.72). However, when PB was less than 3%, the maximal BDMI was 489 g/d at foliage levels of 25.7%. When PB was between 3 and 6%, maximal BDMI was at 13% of foliage in the diet and the basal forage intake of 597 g/d; whereas, BDMI decreased linearly with SD when PB was greater than 6%. BDMI (g/d) decreased quadratically when foliage CP percentages were lesser than 10%, but increased quadratically with PS when foliage CP percentages were greater than 10%. ADG responded positively and quadratically to PS, SPI, SD, PD and TDMI (g/d) and the relationships were moderate to high. However, ADG (g/d) decreased linearly with increasing FS (P < 0.001, R² = 0.35). The maximal ADG was 42 g/d at 43% of SD, 41 g/d at 9.4% PD, 42 g/d at 53 g/d SPI, 35 g/d at 25% PS and 46 g/d at TDMI of 889 g/d (P < 0.001; R² = 0.74, 0.84, 0.74, 0.29 and 0.74, respectively). It is concluded that the interactions of quality and quantity of foliage supplements and quality of basal forages affect intakes of basal and total DM, and growth in sheep.     

溶胀剂U预处理对真丝织物性能及丝纤维结构的影响

为利用溶胀剂的膨化和分纤作用提高真丝织物的接枝增重率和改善织物的性能,采用不同浓度的溶胀剂U对真丝织物进行预处理,再以甲基丙烯酰胺(MAA)为单体,过硫酸钾(KPS)为引发剂对真丝织物接枝增重。选择体积分数为10%的溶胀剂U对真丝织物进行预处理,丝纤维直径由11.90μm增加至14.24μm,起到了较好的膨化和分纤作用,织物的强力、折皱回复角、白度损失也较小。与未进行预处理的真丝织物相比,用10%溶胀剂U预处理后真丝织物的接枝增重率提高,织物的强力、折皱回复角、白度得到改善。真丝织物经10%溶胀剂U预处理后进行丝纤维微观结构形貌表征:红外光谱(IR)显示丝纤维仍保持着β-折叠结构;扫描电子显微镜(SEM)观测到丝纤维表面覆盖的聚合物减少,横截面变粗,直径变大,出现分纤现象和微孔特征;X-射线衍射分析表明丝纤维的结晶度提高。     

Influence of urea molasses treated wheat straw fermented with cattle manure on chemical composition and feeding value for growing buffalo calves

The study was conducted to examine the chemical composition of urea–molasses treated wheat straw (WS) fermented with cattle manure (CM) and its feeding value for growing buffalo male calves. Wheat straw treated with varying levels of urea (0%, 2% and 4%) and molasses (2% and 4%) was ensiled with 30% cattle manure (on dry matter basis) for different fermentation periods (20, 30 and 40 days). Fermented wheat straw (FWS) after each fermentation period was analyzed for pH, dry matter (DM), crude protein (CP), true protein (TP), ammonia nitrogen (NH₃-N), acid detergent fiber (ADF) and neutral detergent fiber (NDF). Maximum pH, DM, CP, TP and NH₃-N and minimum NDF contents were observed with 4% urea. The 4% molasses level increased the CP, TP and NH₃-N contents of FWS, but pH, DM and NDF remained unchanged after 40 days of fermentation. The 4% urea × 4% molasses interaction resulted in maximum DM, CP, TP, NH₃-N after 40 days of fermentation period and this combination was used for large scale production of FWS to evaluate its feeding value for calves. Four isonitrogen and isocaloric diets were formulated. The control FWS 0 diet contained no FWS while in FWS 15, FWS 25 and FWS 35 diets concentrate was replaced with 15%, 25% and 35% FWS, respectively. The diets were randomly allotted to four groups of 28 calves 9–12 months of age, seven in each group, in a randomized complete block design to examine the nutrient intake, digestibility, nitrogen balance and weight gain. An increased DM, organic matter (OM), CP and NDF intakes were observed in calves fed FWS diets compared to those fed FWS 0 diet. Nitrogen retention increased significantly with increasing the level of FWS. The DM, OM, CP and NDF apparent digestibilities were non-significant in calves fed different levels of FWS. A linear increase in weight gain was noticed in calves fed diets containing increasing level of FWS.