SH9在线高速膨胀系统进料含水率对烟丝综合质量的影响

[目的]研究SH9进料含水率对干燥后烟丝综合质量的影响.[方法]研究了SH9在线高速膨胀系统对烟丝进行干燥时不同进料含水率条件下烟丝综合质量变化情况.[结果]研究显示,不同的进料含水率对烟丝、填充值以及感官质量均有较显著影响,对整丝率、碎丝率影响不显著.[结论]研究可为卷烟企业在用SH9在线高速膨胀系统对烟草加工时选择合适的控制参数提供依据.     

饲料添加剂对人畜健康的影响

文章主要讲述了饲料添加剂对人类和动物的影响,并且提出了减少饲料添加剂对人畜健康造成危害的措施。     

Photoperiod influences the growth, food intake, feed efficiency and digestibility of red sea bream (Pagrus major)

Two consecutive trials were conducted to investigate the effects of photoperiod manipulation on growth rate, food intake and feed conversion efficiency (Trial 1), and the digestibility of nutrients and energy (Trial 2) in red sea bream, Pagrus major (body weight 19–120 g). Fish were exposed to four photoperiods (6L:6D, 12L:12D, 16L:8D and 24L:0D) with light intensity 1500 lx on the water surface. The fish were fed with a commercial diet to apparent satiation. In Trial 2, 0.5% chromic oxide (Cr₂O₃) was used as an inert marker. Significantly higher weight gain and specific growth rates were observed in fish exposed to a 24L:0D photoperiod followed by 16L:8D, 6L:6D and 12L:12D photoperiods (P < 0.05). Food intake and feed conversion efficiency (FCE) were also significantly higher in fish exposed to 24L:0D followed by 16L:8D, 6L:6D and 12L:12D photoperiods (P < 0.05). Fish exposed to 24L:0D and 16L:8D photoperiods showed significantly higher lipid and energy digestibility than those exposed to a 12L:12D photoperiod (P < 0.05). The results demonstrated that the enhancement of growth performances under 16L:8D and 24L:0D photoperiods were attributed to improved appetite, greater food intake and higher feed conversion efficiency as well as higher digestibility.     

Manufacturing Different Diet Sizes and Its Effect on Pellet Water Stability and Growth of Three Size Classes of Pacific White Shrimp,Litopenaeus vannamei

Abstract

A feed manufacturing method involving the production of large pellets followed by crumbling to desired diet sizes was used to produce six shrimp diets to determine its effect on growth of three size classes of Pacific white shrimp, Litopenaeus vannamei. The six diets containing 45% protein were 0.7 mm crumble, 1.2 mm crumble, 1.7 mm crumble, 2.2 mm crumble, 2.6 mm crumble, and 3.0 mm pellet. These diets were fed to three size classes of shrimp subjected to a four-week growth trial under indoor laboratory conditions. Stocking density was 12 shrimp/aquarium for size class 1 (1.13iö.01 g), 9 shrimp/aquarium for size class 2 (7.31iö.06 g), and 6 shrimp/aquarium for size class 3 (13.12iö. 10 g). Shrimp were fed three times daily and were evaluated for live weight, growth rate, feed conversion ratio (FCR), and survival. Results for shrimp growth appeared to be affected by diet size and pellet water stability. The effects of diet size, however, were more evident on smaller sized shrimp. Weekly growth rates for class 1 and class 2 shrimp indicated significant responses (P < 0.05) to the effects of diet size, while the class 3 shrimp did not show any significant result. The growth rates for both class 1 and class 2 shrimp were lowest at the smallest diet size (0.7 mm crumble) but differed with respect to highest growth rates. The largest diet (3.0 mm pellets) yielded the highest growth rates for class 1 shrimp, while medium sized feed (2.2 mm crumble) produced the best growth for class 2 shrimp. This could be partly attributed to pellet water stability, which had a direct correlation to diet size (r = 0.97). Smaller diet sizes resulting from crumbling larger pellets tend to have lower water stability. The water stability decreased from 82.5% to 76.3% as the 3.0 mm pellets were reduced to 0.7 mm crumbles. Stress cracks are created during crumbling, and surface area to volume ratio are increased as larger particles are reduced to crumbles. These would make smaller diet particles more susceptible to disintegration and nutrient leaching. For class 3 shrimp, the largest pellets produced the highest growth rate. This high growth value, however, was not significantly different (P > 0.05) from growth results produced by the crumbled feed sizes. This observation suggests that diet sizes ranging from 0.7 mm crumble to 3.0 mm pellet could be used for a 13 g shrimp, although preference would be given to larger pellets due to higher growth performance and better pellet water stability. Results for shrimp live weights were similar to results obtained for weekly growth rates. FCR and survival of all shrimp sizes did not show any significant response from the effects of various diet sizes. However, larger shrimp were less efficient in their diet utilization than smaller shrimp.     

产蛋鸡日粮中添加Vc的效果试验

选取海兰商品蛋鸡１０８只，分为对照和试验Ⅰ、Ⅱ３组，每组３６只，分别饲喂添加０、１００、２００ｍｇ／ｋｇＶｃ的蛋鸡日粮。４２天的试验结果：Ⅰ组提高蛋鸡产蛋数６．３６％，饲料转化效率提高６．７％，经济效益增加１７．０２％；Ⅱ组降低蛋鸡产蛋数１．４５％，降低饲料转化效率２．９４％，比对照组少收入６．３％。说明适宜的Ｖｃ添加量能显著提高产蛋鸡的生产性能。     

动物营养与饲料课程实践性教学改革研究与实践

根据高职高专人才培养方案饲料加工、饲料检验化验、饲料配合与饲料营销等岗位群的要求,为提高学生的动手能力,培养学生独立发现问题、分析并解决问题的能力,满足企业对高级技能型人才的需求,从教学现状、改革思路、改革项目等方面对动物营养与饲料课程的实践性教学进行研究,并探讨初步尝试的效果。     

鲁梅克斯K-1杂交酸模和干玉米秸混合青贮料喂牛试验

８头４～５岁的役用秦川母牛按配对原则分为对照组和试验组。两组牛的精料配方基本相同，但试验组牛饲粮用７．７５％的鲁梅克斯Ｋ－１杂交酸模粉（以下简称鲁梅克斯Ｋ－１）代替对照组中同等重量的小麦麸；对照组牛的粗料全部用干玉米秸，试验组半用６０％干玉米秸和４０％的玉米秸＋鲁梅克斯叶混合青贮料。正试期２０ｄ。结果表明：试验组牛的平均日增重为 ０．７８７ｋｇ，对照组０．６９０ｋｇ，试验组较对照组牛日增重提高了 １４．０６％；每增重 １ｋｇ活重试验组牛消耗精、粗料分别为２．５４ｋｇ、５．２５ｋｇ，对照组半分别为２．９０ｋｇ、５．５０ｋｇ，试验组较对照组个节约精料０．３６ｋｇ、粗料０．２５ｋｇ；试验组每头牛毛盈利为７３．３４元，对照组５９．４０元，前者比后者提高经济效益２３．４７％。说明在役用母牛饲粮中，用鲁梅克斯粉代替精料中的小麦麸并用玉米秸＋鲁梅克斯混合青贮料能获得良好的生产性能和经济效益。     

毛细管区带电泳测定饲料添加剂中酪蛋白磷酸肽含量的方法研究

利用毛细管区带电泳(CZE)对饲料添加剂中酪蛋白磷酸肽(CPP)样品进行分离，结果显示，用四硼酸钠缓冲溶液(20mmmol/L,pH9.2)及50cm×70μmi.d.石英毛细管柱，在工作电压30kV、检测波长200nm、柱温25℃的条件下，CPP得到较好的分离；同时，采用外标法对饲料添加剂样品中CPP各组分的含量进行了测定。     

“三三法”快速检测沙门氏菌的研究

将DHL平板上产H_2S和不产H_2S的菌落分别用TSI、LMA、甘露醇或TSI、LMA、ONPG三管判定,辅以肠杆菌科诊断噬菌体0—1、C多价、E多价三滴法快速检测沙门氏菌的方法简称“三三法”。近两年来我们用此法检测了125批、341份样品中236株可疑菌株,检出沙门氏菌27株、11个血清型,经系统生化验证符合率100％。表明该法具有快速、简便、准确、实用的优点。     

不同复合酶制剂对肥育猪生长性能的影响

试验选用72头100日龄,体重在44kg左右的三元杂交(杜×长×大)商品代瘦肉型肥育猪,完全随机分为3个组(A、B、C),每个组24头,设三个重复。A组中,饲料中加入国产复合A酶;B组中,饲料中加入国产复合B酶;C组中,饲料中加入罗酶宝TM。经过30天的饲养试验,结果表明:①B、C两组肥育猪的日增重比A组分别提高0.81%、5.50%,C组比B组日增重提高4.65%;②C组肥育猪料重比比A组提高3.53%,C组料重比比B组提高2.59%,B组料重比比A组提高0.96%;③经济效益,C组比A、B两组分别提高8.59%、5.99%;④试验全期,三个处理组的腹泻率均极低。