氨酰胺、甘氨酰谷氨酰胺对肉鸡日增重和免疫器官发育的影响

选择健康1日龄黄羽肉鸡（母）90只，随机分为3组,每组3个重复, 每重复10只。对照组饲喂基础日粮。试验1组饲喂在基础日粮中添加0.40%谷氨酰胺的日粮，试验2组饲喂在基础日粮中添加0.20%甘氨酰谷氨酰胺的日粮，进行28 d的试验，探讨谷氨酰胺和甘氨酰谷氨酰胺对黄羽肉鸡增重和免疫器官发育的影响。结果表明，在黄羽肉鸡日粮中添加0.40%谷氨酰胺和0.20%的甘氨酰谷氨酰胺有利于提高肉仔鸡平均日增重和促进免疫器官（胸腺、脾脏和法氏囊）的发育，添加0.20%甘氨酰谷氨酰胺显著提高第1周的日增重(P<0.05)和显著提高第28 d的法氏囊指数(P<0.05)。添加0.20%甘氨酰谷氨酰胺的提高生长性能和促进免疫器官发育的效果相当于添加0.40%谷氨酰胺的效果。     

发酵洋芋渣喂猪效果试验

采用坑贮乳酸菌发酵的洋芋渣喂猪,试验组比对照组每头猪平均日增重提高37g,提高9.43%,试验组比对照组头均每kg增重减少饲料支出9.12%,试验组比对照组头均盈利增加36.73元,试验组比对照组头均提高24.15%,试验组头均总增重比对照组提高6.56kg,经t检验,试验组增重显著(P<0.05)。     

A study on the geographic variation and selection of the best provenance ofLarix olgensis

On the basis of the results from the geographic provenance test of nine years oldlarix olgensis in Liangshui Natural Reserve of our university, a study on the geographic varition and the primary selection of the best provenance ofLarix olgensis was carried out. The main results are as follows: I.The different provenances ofLarix olgensis have rich and wide genetic variation, and exist a linear correlation with latitude and longitude in collection area. General trends are enumerated below: Provenances at lower latitude and more west longitude have lighter thousand seed weight, short growth period, higher increment, wide branches, rich leaves and crown as well as worst adaptabillity. It is a dual-way variation along with two directions of latitude and longitude, and also embodies a change gradually in climate condition from south to north. The temperatures in seed production site, especially the mean temperature in January and ≥10 °C accumulated temperature, are important factors that produce geographic variation forlarix olgensis. 2. The variation of different provenances in periodic biological phenomena and growth rhythm trends are that: 1 both of the provenances from Changbai Mt. (III) and Dashitou(IV) at low latitude belong to the centralized growth type, and have shout growth period, the difference between these two provenances is that the provenance from Changbai Mt. grows well in all time, Dashitou provennce is well only in later period; 2 the provenance from Baidao Mt. (II) at middle latitude belongs to even growth type and has longer grpwth period, this provenance has higher increment in early and later periods relatively; 3 Xiaobeihu provenance at high latitude is a growth type among II. III and IV provenances and has a general growth period, the provenance grows better in middle time and worse in later time. 3. The best provenance in Liangshui Natural Reserve and its meighbourhood is Dashitou Procenance, which growth in height, diameter and volume has exceeded 16. 28%, 46. 27%, 30. 58%, 78. 20, 82. 00% as well as 392. 00% by comparison with the mean value of the contrast and the worst provenance respectively, The result from the height growth of three, five, seven and nine years oldLarix olgensis by using the method of order correlation analysis demonstrates that it is possible to make early selection of the provenance. Meanwhile, data from juvenile and mature oflarix olgensis plantation also prove the reliability of the early selection. 4. The provenance heritabilities of nine years oldlarix olgensis in Liangshui Natural Reserve are follows: The heritability of the height growth (h²) is 0.79; The heritability of the diameter breast height (h²) is 0.791; The geretic gain is 24.5% and 40.36% respectively.     

小麦高世代品系中3种综合选择法的效果比较

在2个小麦高世代品系中进行单株选择、分系比较,分析4个产量性状的遗传变异程度和遗传进度,比较了3种综合选择法在小麦纯系育种中的选择效率。结果说明,针对原始群体的主要缺点,着重对个别性状的选择,纯系育种法还有很大潜力。但对综合性状的选择,有必要研究群体中各个性状的遗传变异度、遗传进度及综合选择方法,这便于有预见地进行选择,从而提高纯系育种的效率。     

鲁梅克斯K-1杂交酸模饲喂西门塔尔杂交牛的效果研究

本试验分别用西杂F2代母牛90头和西杂F3代公牛30头做产奶和育肥试验，每组又分试验组和对照组，各组的试验组与对照组精料用量及营养水平相同。试验组饲喂鲁梅克斯K－1杂交酸模牧草，对照组饲喂青刈杂草，产奶组在一个泌乳期（270d）内，试验组比对照组多产奶818kg/头（P＜0.05），增收1852.2元／头，育肥组育肥90d内，试验组平均增重比对照组提高33％（P＜0.05），增收190.4元／头。     

氯化胆碱在断奶仔猪保育期的使用效果试验

将48头约（克夏）互（助猪）F135日龄断奶仔猪分成四组，分别饲喂占基础日粮的0％、0．09％、0．14％、0．19％的氯化胆碱。试验期45天，结果表明，三个试验组与对照组相比，日增重分别提高13．3％、17．3％、15．1％。饲料转化率提高8．65％、10．10％、5．77％。经济效益提高16．0％、21．0％、16．6％。经济效益可观。     

EM制剂在肉兔生产中的应用效果试验

EM制剂能促进肉兔的生长,提高生产性能,增加经济效益。50 d的试验表明,饲喂EM发酵饲料的试验组 与对照组相比,日均增重提高14.34％,发病死亡率降低42.86％,饲料报酬提高8.82％,毛利润提高31.7％,每只兔增收 毛利0.77元,在生产中具有较高的应用价值。     

日粮中添加稀土对肥育牛生理生化指标及日增重的影响

本试验主要研究了日粮中添加RE(稀土元素)对肥育牛生理生化指标、日增重及消化代谢的影响。选用断奶后育肥牛20头,随机分为两组,每组10头,经15天预试期后,试验组基础日粮添加0.2%稀土。试验期为60天。结果表明:日粮中添加RE对肥育牛的23项生理生化指标均没有显著影响(P>0.05);但试验组牛的血糖浓度比对照组显著降低(P<0.05),血清总蛋白质显著升高(P<0.05),尤其以清蛋白的升高为主(P<0.05);试验组牛的平均日增重比对照组明显提高(P<0.01)。     

日粮中添加艾叶粉饲养肉仔鸡的试验研究

7日龄肉仔鸡240只,分为3组,每组80只.1～3组鸡日粮中分别添加艾叶粉0.1%、2%,饲养至56日龄.结果,3个组平均每只增重分别为2059.79g、2156.72g和2115.57g,饲料效率分别为0.407、0.472和0.450.干物质和有机物质代谢率分别为:1组,77.93%和58.07%;2组,87.03%和69.70%;3组,81.36%和60.17%.     

塑料大棚结构与设施对肉仔鸡增重效果试验

塑料大棚饲养肉仔鸡,在广大农村普遍被采用,但不同的大棚结构与设施对肉鸡饲养效果存在很大差异,为了改善大棚内的饲养环境,提高夏季饲养肉仔鸡的经济效益,因此,对不同的大棚结构与设施进行了改造试验。结果,试验组比对照组肉仔鸡成活率提高了3.27个百分点,增重提高了9.4%,棚内温度降低了3.4℃,使每只鸡多增加收入1元,取得了显著效果。