The effects of two corn-expressed phytases on broiler growth performance and tibia mineralization     

《The Journal of Applied Poultry Research》2021,30(1):100131

  相似文献   

环模制粒机中环模结构型孔的有限元分析   总被引：5，自引：0，他引：5  

张炜  吴劲锋 《中国农机化》2009,(2)

苜蓿草粉对环模系统的磨损是造成饲料制粒机关键部件环模失效的主要原因.本研究应用Pro/E及ANSYS软件完成三种类型环模型孔的建模及有限元静力分析.得到了三种类型环模型孔沿轴向路径的应力与变形分布,找到了环模孔倒角与环模孔轴向路径的应力与变形的影响关系,60°倒角环模孔结构好,为环模进行结构优化提供了依据.  相似文献   

添加复合酶和制粒对肉鸡次粉-杂粕-植酸酶型日粮主要养分利用率的影响     

刘庆华  聂芙蓉  李梦云 《西北农林科技大学学报(自然科学版)》2009,37(1):5-10

【目的】研究复合酶对粉状及颗粒状次粉-杂粕-植酸酶型日粮能量及养分利用率的影响,为复合酶在肉鸡饲料中的合理应用提供依据。【方法】选择健康、体质量1.8~2.0 kg的黄羽公鸡20只,随机分成4组,每组5只,一组为内源组,其余3组分别强饲次粉-杂粕-植酸酶型基础日粮的粉料(对照组)、基础日粮+0.25 kg/t复合酶的粉料和基础日粮+0.25 kg/t复合酶的颗粒料。收集强饲后36 h内的排泄物,测定有机物(OM)、Ca、P、粗蛋白(CP)和氨基酸利用率以及代谢能。【结果】(1)日粮中添加复合酶可显著提高黄羽公鸡对OM、Ca、P、CP、总氨基酸的表观利用率和真利用率、表观代谢能(AME)和真代谢能(TME);(2)与粉料相比,颗粒料使黄羽公鸡对OM、Ca、P、CP的表观利用率和真利用率及AME和TME进一步提高(P<0.05或0.01),对总氨基酸表观利用率和真利用率有提高趋势,但差异不显著(P>0.05)。【结论】添加复合酶和制粒可显著提高肉鸡对次粉-杂粕-植酸酶型日粮能量及主要养分的利用率。  相似文献   

Stability of crystalline and coated vitamins during manufacture and storage of fish feeds   总被引：3，自引：0，他引：3  

MARCHETTI  TOSSANI  MARCHETTI  & BAUCE 《Aquaculture Nutrition》1999,5(2):115-120

The stability of two forms of vitamins, crystalline and fat-coated, during manufacturing processes and storage of fish feeds was investigated. After extrusion, vitamin recovery was generally lower than that found after pelleting. The recovery of coated forms after pelleting was higher than that of crystalline ones, especially for ascorbic acid, menadione, pyridoxine and folic acid. Coated forms were also found to be more resistant to extrusion than crystalline forms. No significant differences in vitamin losses during storage were found between pelleted and extruded feeds. However, losses of ascorbic acid, menadione and pyridoxine in both manufactured feeds were much greater in crystalline than in coated forms.  相似文献   

棉仁(籽)饼—玉米型肉仔鸡饲粮的研究     

霍启光  林理真  邵榴  孙万岭 《北京农学院学报》1988,(3)

用LOHMANN品种肉仔鸡608只进行两次试验,研究了棉仁(籽)饼—玉米型饲粮的应用问题,单因子设计。第一次试验给饲八种试粮:(1)、棉仁饼(CSM)为0,游离棉酚(FG)为0;(2)、CSM为7.5%,FG为111ppm;(3)、(2)+亚铁离子(Fe~(++))111ppm;(4)、CSM为15.0%,FG222ppm;(5)、(4)+F~(++)222ppm;(6)CSM为30％,FG为444ppm;(7)、(6)+Fe(++)444ppm;(8)、(6)+L—赖氨酸(Lys)。第二次试验给饲4种试粮:(9).CSM:大豆饼(SBM)=20:80,粉料;(10).CSM:SBM=50:50,粉料;(11).CBM:SBM=100:0,粉料;(12)、(11),颗粒料。结果:(1)、CSM配比为0—7.5—15.0—30.0%,FG为0—111—222—444ppm时,不经任何脱毒处理,各组49日龄增重(分别为1779.3—1853.8—1861.3—1819.0克)、累积耗料(分别为3978—4217—4208—4158克)、耗料比(分别为2.24—2.27—2.26—2.29)等均未随FG水平提高而产生有规律的明显差异;鸡肝脏残留FG均在安全水平以下;氰化高铁血红蛋白(CNMHb)在正常生理范围以内。(2)、日粮FG为111—222—444ppm时,分别添加111—222—444ppm的Fe~(++)后,对试粮各项生产指标、能量代谢率、蛋白质表现存留率、鸡肝脏残留FG水平、血液CNMHb量均未发生明显影响。(3)、当CSM:SBM分别为20:80、50:50、100:0,构成等蛋白质(%),不等能量浓度(不以饲料脂肪调整)的试粮,试鸡各项生产指标差异均不显著(P>0.05)。(4)、CSM配比为30%时,添加L—Lys,将Lys:精氨酸(Arg.)由1:1.6～1.7调整为1:1.2。结果,Lys:Arg.平衡组(为1:1.2时)试鸡49日龄体重明显较高,但累积耗料量、耗料比,试粮能量代谢率、蛋白质表观存留率差异均不显著(P>0.05)。(5)、用棉仁饼100%地取代豆饼的低能量浓度试粮,经颗粒加工后,其饲料进食量,增重量明显提高。  相似文献   

虾料制粒机的压辊数量对颗粒品质的影响     

苏京波  毛杰 《饲料与畜牧》2014,(12):20-22

压辊数量对虾料制粒机的颗粒品质有很大影响。文章分别对两压辊、三压辊结构进行分析,研究表明,两压辊制粒机较三压辊制粒机,更适宜用于虾料制粒。  相似文献   

丸粒化处理对胡麻种子萌发和幼苗生长的影响研究     

崔红艳  胡发龙  方子森  周玉瑞  牛俊义 《干旱地区农业研究》2015,33(2):26-31

采用二因素裂区设计,以保水剂和活性炭、硅藻土、凹凸棒为填充剂的包衣材料制作丸粒化胡麻种子,研究了丸粒化处理对胡麻种子萌发和幼苗生长的影响。结果表明:与不加保水剂相比,保水剂质量与种子质量为1∶1时,丸粒种子的活力指数和出苗率显著提高20.11%、18.62%;随着保水剂含量的增加,幼苗的根冠比显著减小3.25%。包衣剂中以活性炭:凹凸棒=1∶1为填充剂的发芽率和出苗率比不加填充剂的明显提高6.79%、22.41%,幼苗生长最健壮。与未丸粒化的种子相比,当保水剂质量与种子质量为1∶1时,以活性炭:凹凸棒=1∶1为填充剂的丸粒种子发芽指数、活力指数和出苗率显著提高,而且幼苗的茎粗、叶面积和根冠比分别显著增加11.02%、27.35%、28.07%。可见,适量的保水剂(保水剂质量与种子质量为1∶1)和以活性炭、凹凸棒为填充剂的包衣剂能提高胡麻种子活力,增加出苗率,使幼苗的干物质重增大,根系发达,根冠比提高,为胡麻高产奠定了良好的基础。  相似文献   

Growth performance and carcass quality are not different between pigs fed diets containing cold-fermented low-oil DDGS and pigs fed conventional DDGS,but pelleting improves gain to feed ratio regardless of source of DDGS     

Diego A Rodriguez  Su A Lee  Hans H Stein 《Journal of animal science》2021,99(8)

The objective of this study was to test the hypothesis that growth performance and carcass characteristics of pigs fed diets containing cold-fermented, low oil distillers dried grains with solubles (DDGS) is not different from that of pigs fed diets containing conventional DDGS regardless of the physical form of the diets. A total of 160 barrows and gilts were used. There were 4 diets, 10 pens per diet, and 4 pigs per pen. Pigs were weaned at 21 d of age and fed a common phase 1 diet that did not contain DDGS during the initial 7 d post-weaning. Pigs were then allotted to the four diets that were arranged in a 2 × 2 factorial design with two sources of DDGS (cold-fermented and conventional DDGS) and two diet forms (meal and pellets). Pigs were fed phase 2 diets from day 7 to 21 and phase 3 diets from day 21 to 43 post-weaning. All diets were based on corn and soybean meal, but phase 2 diets also contained 15% DDGS and phase 3 diets contained 30% DDGS. From day 43, pigs were fed grower diets for 38 d, early finisher diets for 38 d, and late finisher diets for 18 d and these diets also contained 30% DDGS. Feed was provided on an ad libitum basis and daily feed allotments were recorded. Pigs were weighed at the beginning of each phase and at the conclusion of the experiment. On the last day of the experiment, the pig in each pen with a body weight that was closest to the pen average was slaughtered and carcass measurements were determined. Combined results for the two nursery phases indicated that feeding meal diets instead of pelleted diets increased (P < 0.001) average daily feed intake and decreased (P < 0.05) gain to feed ratio (G:F). However, no differences between the two sources of DDGS were observed for the overall growth performance of weanling pigs. For the entire growing-finishing period, the source of DDGS did not affect growth performance, but pigs fed meal diets had reduced (P < 0.001) G:F compared with pigs fed the pelleted diets. There were no differences between the two sources of DDGS for carcass characteristics. Back fat was greater (P < 0.05) for pigs fed pelleted diets than for pigs fed meal diets. In conclusion, no differences in growth performance or carcass characteristics between pigs fed cold-fermented DDGS and pigs fed conventional DDGS were observed. However, pigs fed pelleted diets had greater G:F and greater back fat than pigs fed meal diets.  相似文献   

日粮制粒对绵羊利用玉米秸秆的影响   总被引：3，自引：0，他引：3  

王洪才 《安徽农业科学》2009,37(11):5003-5004

[目的]研究颗粒料对绵羊生产性能、经济效益及秸秆消化率的影响。[方法]将玉米秸秆与混合精料混合并添加营养性添加剂,在此基础上制成颗粒料,分别饲喂2组小尾寒羊,测定各营养物质的采食量、消化量和消化率。[结果]结果表明,日粮制粒能明显地提高绵羊对玉米秸秆的利用率和绵羊的生产性能。[结论]该研究制备的颗粒料能大幅度促进绵羊的生长。  相似文献   

Response of broiler chicks to non-steam- or steam-pelleted diets containing raw,full-fat soybean meal     

《The Journal of Applied Poultry Research》2017,26(2):260-272

The objective of this study was to evaluate the effects of steam pelleting of diets containing graded levels of raw, full-fat soybean meal (RSBM) on the chemical properties and feeding values of the diets. Samples of diets with steam- or non-steam-pelleted as well as the mash containing varying levels of RSBM were subjected to detailed chemical analysis. As a result of this study, trypsin inhibitor (TI) concentrations in the diets ranged between 4,153 and 10,484 TIU/g. Amino acid concentrations were higher in the non-steam-pelleted and mash diets than the steam-pelleted diets. A 4 × 2 factorial arrangement (RSBM: zero, 10, 20 or 30%, equivalent to zero, 30, 60, and 90 g/kg of diet, respectively, and non-steam- or steam-pelleted diets) was used while feeding broiler chicks (zero to 14 d of age). Each treatment was replicated 6 times with 8 birds per replicate. As a result of this study, there was no difference (P > 0.05) in mortality of birds among the groups. Feed intake (FI) (P < 0.05) and body weight gain (BWG) (P < 0.001) decreased with increasing levels of RSBM. Birds fed on steam-pelleted diets gained less (P < 0.001) weight than birds on the non-steam-pelleted diets, but the FI was not significantly (P > 0.05) different. The FCR was negatively affected (P < 0.05) by increasing levels of RSBM. There was no interaction effect between RSBM and pelleting method on the FI, BWG, or FCR of birds. The weight of the pancreas (P < 0.001) and duodenum (P < 0.01) increased with a rise in the level of RSBM in diets. Non-steam pelleting increased (P < 0.05) the pancreatic protein content, whereas the activity of chymotrypsin was reduced (P < 0.01) when the RSBM level was increased. Birds fed with RSBM-free diets had thicker muscle, longer villi, wider villus surface area, and higher villus to crypt depth ratios than birds on the other diets, but these differences were not significant. It can be concluded that steam pelleting of diets containing RSBM is inadequate to reduce the adverse impact of TI on chicks.  相似文献