共查询到20条相似文献，搜索用时 62 毫秒
1.
试验用均匀设计U5(53)法配制5组不同蛋白质、糖类、脂类组合水平的饲料,对体重(60±1.48)g的半滑舌鳎幼鱼进行77d的养殖,研究了5组饲料对半滑舌鳎生长的影响。结果表明,投喂B组饵料系数最低,增重率、特定生长率均高于其它各组。用WSUT均匀设计软件对增重率Y1、特定生长率Y2和饵料系数Y3做回归方程(蛋白质X1、糖类X2和脂类X)3:Y1=-406.1680+16.3719X1-0.1527X12+0.1920X2X3(R2=0.9925)、Y2=-3.2135+0.13272X1-0.0012X12+0.0016X2X3(R2=0.9968);Y3=16.1141-0.5241X1+0.0047X12-0.0025X22(R2=0.9994),当X1=53.61、X2=15、X3=15时;Y1max=75.89,Y2max=0.74,Y3min=1.01。 相似文献
2.
采用均匀设计U8(85)法研究了饲料中蛋白质(X1)、植物油(X2)、胆固醇(X3)、维生素(X4)和矿物质(X5)对凡纳滨对虾(Litopenaeus vannamei)生长和饵料利用率的影响。试验进行了41 d。以相对增重率(Y1)、饵料系数(Y2)、蛋白质效率(Y3)和表观消化率(Y4)为因变量建立回归模型,得出相对增重率的回归模型为:Y1=154.71+0.055 574 2X1+1.246 44X1X5-3.818 26X32+51.884 2X3X4-5.36614X42-57.9849X52(R2=0.999 9);饵料系数的回归模型为:Y2=0.477 185+0.320 387X2-0.009 847 12X1X3+0.032 482X1X4-0.287 23X2X4-0.073 165 5X32+0.914 946X3X4(R2=0.652 7);蛋白质效率的回归模型为:Y3=142.674+1.72858X1-0.288 361X1X2-2.876 73X1X4+1.300 53X1X5-5.973 4X2X3+15.154 7X42(R2=0.896 1);表观消化率的回归模型为:Y4=80.735+1.826 07X2+0.217 189X1X4-0.017 297X1X5+0.297 278X2X4+0.425 209X4X5-1.523 78X52(R2=0.966 2)。利用全排列法得出饲料中蛋白质为34.25%,植物油为1%,胆固醇为0%,维生素为1.5%,矿物质为0.38%、0.75%、1.13%时凡纳滨对虾生长较快,饵料利用率较高。 相似文献
3.
不同维生素组合对点带石斑鱼生长性能的影响 总被引：3，自引：0，他引：3
采用U122(1210)均匀试验设计,通过在相同基础日粮中分别添加维生素A(VA)、维生素D(VD)、维生素K(VK)、叶酸、维生素B1(VB1)、维生素B2(VB2)、维生素B6(VB6)、泛酸钙、烟酰胺和肌醇,对试验鱼进行9周的饲养试验,研究其对点带石斑鱼增重率(WGR)、特定生长率(SGR)、饵料系数(FC)、蛋白质效率(PER)及肌肉和肝脏中RNA/DNA等指标的影响.结果表明:(1)不同维生素组合能显著影响点带石斑鱼WGR、SGR、PER及肌肉和肝脏中RNA/DNA等指标(P<0.05);对FC影响禾显著(P>0.05).(2)肌肉及肝脏中RNA/DNA比率的大小依WGK的大小呈规律性的变化.第10组生长最快,其FC最低、PER最高,肌肉及肝脏中RNA/DNA也最高.(3)以WGR为因变量(Y),10种维生素为自变量(X1、X2……X10)建立回归方程:Y=30.62794+0.00204X1+0.00330X2+0.10748X4+0.11866X5-0.07566X7+0.11400X8+0.01335X9+0.00613X10-0.000000143915X12-0.01123X32+0.00091170X62-0.00028190082-0.00000173X102(R2=0.9982),由此可求最优配比. 相似文献
4.
铜、铁、锌、锰不同组合水平对鲤鱼生长的影响 总被引：13，自引：3，他引：10
试验采用均匀设计U9(95)经60d试验,研究Cu(x1)、Fe(x2)、Zn(x3)、Mn(x4)不同组合水平对鲤鱼生长的影响。结果表明,在本试验条件下,各因素与增重呈显著的回归关系:①y=6.8167+0.021515x4+0.0021885x1x4-0.00009120x2x4+0.00000924x32,拟和度R2=95.1%(P<0.05),最优组合为x1=23.5mg/kg,x2=141.7mg/kg,x3=89mg/kg,x4=31.8mg/kg,此时增重为70.42g,比试验最优组处理7增重高17.05%。②Cu、Fe、Zn、Mn与体增长呈显著的回归关系,y=0.55167+0.0001557x3-0.00019352x1x4-0.0000089x22,拟和度R2=93.9%(P<0.05),最优组合为x1=0.4mg/kg,x2=72.4mg/kg,x3=104mg/kg,x4=24.4mg/kg。各试验组的净增重、相对生长率、饵料系数优于对照组,其中以处理7最优。 相似文献
5.
生长猪低蛋白质日粮可消化赖氨酸、蛋氨酸+胱氨酸、苏氨酸、色氨酸平衡模式的研究 总被引：3，自引：0，他引：3
试验通过研究低蛋白质饲粮中可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平对生长猪生产性能和尿素氮的影响,以建立生长猪日增重和料重比对日粮可消化氨基酸的回归模型.选取体重30 kg的三元(杜×长×大)杂交生长猪68头,随机分为17个处理,每个处理4头猪,运用4因素5水平二次回归正交组合设计(1/2实施),研究得出日增重和料重比对日粮可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平的回归方程.生长猪日增重(Y1,g)对日粮可消化赖氨酸(X1,%)、蛋氨酸 胱氨酸(X2,%)、苏氨酸(X2,%)和色氨酸(X4,%)水平的回归方程为:Y1=-5.568 0 7.587 8X1 3.045 2X2 9.183 5X3 4.226 9X4 5.200 4X1 X2-1.905 6X1X3 2.233 4X1X4-6.005X12-7.3694X22-7.5432X32-22.073242=(R2:0.964 0,P<0.05);生长猪料重比(Y2,g)对日粮可消化赖氨酸(X1,%)、蛋氨酸 胱氨酸(X2,%)、苏氨酸(X3,%)和色氨酸(X4,%)水平的回归方程为:Y2=12.176 0-9.843 6X1-19.043 2X2-2.486 7X3-11.733 0X4-1.875 0X1 X2-6.875 0X1 X3 1.562 5X1X4 8.986 6X12 23.274 5X22 7.968 4X32 33.470 5X42(R2=0.921 3,P<0.01);日增重达到最大值(0.775 kg)时,日粮的可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平分别为0.78%、0.48%、0.51%和0.14%.相应的氨基酸比例为Lys:(Met Cys):Thr:Trp=100:61:64:18.料重比最小(2.69)时,对应的日粮可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平分别为0.77%、0.44%、0.49%和0.16%.氨基酸比例为Lys:(Met Cys):Thr:Trp=100:57:64:21.对日增重和料重比进行综合考虑,获得最佳生产性能的可消化氨基酸的比例范围为Lys:(Met Cys):Thr:Trp=100:(57～61):64:(18～21). 相似文献
6.
《中国畜牧兽医文摘》2012,(1)
对51条青海湖裸鲤体重、体尺性状剖分测定及应用SAS(6.12版)系统软件进行相关回归分析,结果表明:Y1(体重)与X1(头重)、X2(鳍重)、X3(躯尾重)、X4(肠容物重)相关系数极显著,其最优回归方程式:总方程:Y1=-2.24390+0.99898X3+1.30604X4(R2=0.9210p0.0001),♀:Y1=1.93002+0.88362X3+1.24584X4(R2=0.9198P0.0001),♂:Y1=8.97641+1.20310X3(R2=0.9956p0.0001)。Y2(体长)与X5(头长)、X6(躯干长)、X7(尾长)相关系数极显著,其最优回归方程式:♀:Y2=3.62909+2.25776X5+1.10367X7(R2=0.8150p0.0032),♂:Y2=0.97145+0.95331X6(R2=0.9534p0.0077)。 相似文献
7.
《畜牧与兽医》2015,(8):39-42
利用SPSS 11.5软件中的11种曲线回归模型对小尾寒羊羔羊体重和体尺进行曲线拟合,根据相关指数R2和T检验选择建立最优回归方程,并对曲线模型估计值与测量值进行了比较。生长发育最优回归方程如下,体高:Y=41.058 6+5.368 6X-0.370 7X2;体长:Y=46.263 3+13.116 1ln X;胸围:Y=48.779 5X0.261 6;胸宽:Y=14.036 7X0.231 2大腿围:Y=27.234 2X0.169 6;腰角宽:Y=5.678 6+6.375 5X-1.329 9X2+0.097 5X3管围:Y=e(2.149 1-0.407 8/X);体重:Y=9.062 8X0.733 0,上述拟合曲线方程均可靠(R2都在0.917 1~0.994 0之间),可以用来预测小尾寒羊早期生长发育体重及体尺。 相似文献
8.
9.
饲料中添加10%~50%不同水平的芜萍粉对泥鳅的生长及生产性能的影响。试验结果表明:日粮中添加芜萍粉,泥鳅的成活率、日增质量和相对生长率均高于对照组,20%组、30%组、40%组与对照组相比差异显著;30%组各项生长指标均优于其他试验组,其日增质量和相对生长率分别是对照组的1.22和1.24倍,成活率比对照组提高10%;芜萍粉添加量超过40%时,蛋白质效率降低,饲料系数升高。芜萍对泥鳅的含肉率和内脏比均产生明显的影响,在10%~50%的含量范围内,含肉率与芜萍添加量呈正相关性,相关回归方程为Y1=0.037 6X1+71.53,R=0.932 2,相关性极显著;内脏比与芜萍添加量呈负相关性,相关回归方程为Y2=-0.040 8X2+10.57,R=-0.963 9,相关性极显著。 相似文献
10.
大豆油脂肪酸钙制备工艺优化研究 总被引：1，自引：0，他引：1
为寻求制备大豆油脂肪酸钙的优化工艺,在复分解法初步研究基础上,采用三因素二次回归正交旋转组合设计,进行了大豆油脂肪酸钙制备工艺参数优化研究,建立了产品得率(Y)与复分解反应温度(X1)、用水量(X2)、超盐量(X3)之间关系的回归方程,即Y=91.48287+1.13938X1+1.82739X2+1.69316X3-1.77741X12-1.91710X22-1.52456X32+0.84250X1X2。从模型推知,当复分解反应温度为64.57℃、用水量为油重的7.58倍、超盐量为12.78%时,得率得到最大值92.74%。验证结果与模型值相符。 相似文献
11.
12.
13.
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
14.
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
15.
16.
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
17.
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
18.
19.
20.
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