共查询到20条相似文献，搜索用时 250 毫秒
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锤片式饲料粉碎机筛网是影响粉碎机筛分效率的重要因素之一,为了提高新型锤片式饲料粉碎机筛分效率,对粉碎机筛网进行了改进,设计为凹面型筛网。将原来的平板型筛网改进设计为凹面型筛网,再利用EDEM软件模拟仿真,统计其筛分后出料量与回料量,比较平板型筛网与凹面型筛网回料率的大小和仿真用时。结果发现,在相同的条件下,平板型筛网物料回料率较大,且回料用时较长,说明筛分效率较低。新型锤片式饲料粉碎机凹面型筛网可以有效提高粉碎机筛分效率。以上研究为该粉碎机的筛分效率的提高设计提供了一种新思路,并为其他机械的筛网改进提供了理论依据。 相似文献
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《饲料工业》2021,(15)
基于新型锤片式饲料粉碎机工作状况,对分离装置内物料颗粒在不同运动状态下进行分析。将EDEM-FLUENT耦合的方法用于该分离模型中,通过数值模拟,取得了物料颗粒在分离装置内的运动轨迹。为对分离装置进行研究,文章将分离流道入口处的固相颗粒速度与气相速度设置为相等,然后将物料颗粒的入射角分别设置为30°、45°和60°来进行分析。得到当入口颗粒速度等于气相速度,入射角度为45°时,分离装置的筛分效率最高;之后对模拟结果按入口固相颗粒入射角度为45°,气相入口速度不变,对入口固相颗粒速度小于、大于气相速度时进行分析。结果表明:在气相速度大于物料颗粒运动速度时,气流将对物料颗粒产生推动作用,减少物料颗粒与分离流道内管壁的摩擦,使被粉碎后的物料颗粒能够到达筛网处的数目增加,提高锤片式饲料粉碎机的筛分效率及整机的工作效率。 相似文献
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为了解决新型锤片式粉碎机透筛效率较低的问题，设计出两种不同结构的筛网。使用Fluent对安装不同筛网的分离装置进行气流场模拟，随后将模拟出的气流场导入EDEM进行耦合仿真。对比分析了物料在安装不同筛网的分离装置中的运动情况，统计单位时间内的出料量，对新型锤片式粉碎机的透筛效率进行定义，比较了原始筛网与改进后筛网的透筛效率。结果表明：与原始筛网相比，改进后的凹版型筛网在凹面数为2的情况下，透筛效率达到最优，相对于原始筛网透筛效率提高了32.65%。最后通过试验对模拟得出的结果进行验证。统计原始筛网与凹版型筛网在单位时间内的出料量，结论表明：设计出的筛网能有效提高物料透筛效率。 相似文献
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为提高锤片式粉碎机筛分效率,弥补现有粉碎机生产率低、能耗高等缺点,基于泛函分析理论,对粉碎机分离装置进行优化。文章选取了以粉碎机的工作小时生产率和吨料电耗为评价指标,以筛网倾角、主轴转速、喂入量为影响因素,用玉米为原料,进行二次回归正交旋转中心组合试验研究及分析,建立各指标与因素间的回归数学模型,确定了各个因素对评价指标的影响规律和主次顺序。综合分析后得出工作小时生产率与吨料电耗的较优水平组合:筛网倾角61.78°、主轴转速2 477.5 r/min、喂入量6.42 kg。在该结构和工艺参数下,与采用原分离装置相比,工作小时生产率提高1.48%,吨料电耗降低3.38%。该研究为锤片式饲料粉碎机粉碎饲料研究和优化提供一定理论依据。 相似文献
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削片揉搓一体式防缠绕桑枝条粉碎机的设计 总被引：1，自引：1，他引：0
利用蚕桑生产中废弃桑枝条粉碎的木屑,能解决平原地区食用菌培养基原料匮乏的问题。根据现有木材削片机与其它物料粉碎机的工作原理,充分考虑桑枝条直径小、细小枝桠多、枝皮韧性强的特点,采用削片、粉碎、筛分一体化的设计方案,初步研究设计出了结构紧凑、操作方便、运行平稳的削片揉搓一体式防缠绕桑枝条粉碎机具。样机主要性能指标检测结果:能够粉碎直径40 mm的桑枝,桑皮无缠绕现象,木屑粗细均匀,生产效率达到500 kg/h。样机进一步降低能耗和优化粉碎效率的各项指标后,有望在生产上推广应用。 相似文献
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基于为桑枝食用菌基料大规模生产中的枝条粉碎提供高效、安全、实用机具的目的,参照国家及部颁标准进行标准化设计,设计并研制出QCF50型多用枝条粉碎机。该机的基本结构由架体、动力、工作部件3个部分组成,将切、碎、筛3个加工过程集于一体,从传动、进料、物料粉碎到出料都在安全防护下进行。通过对该机主要技术参数的设计与计算,合理选用材料、配置主轴转速及采用适应不同原料加工的筛板,使样机的性能可靠、运行安全。样机用于植物枝条粉碎加工的生产效率达到1 000 kg/h,用于园木棒材粉碎加工的生产效率为1 500 kg/h,粉碎的物料达到食用菌培育基料的质量要求。 相似文献
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一群224头的母猪(康贝尔22和康贝尔29)(头胎母猪72头、2胎母猪24头、3胎母猪36头以及4胎或以上母猪92头),该母猪群在分娩前14 d分组,并分别按3种饲喂方案中的一种进行饲喂,以确定妊娠后期增加喂料量对提高仔猪初生重及窝仔重的有效性。将商品猪场同一周、同一批次配种的小母猪和经产母猪随机分为3组,按3种喂料方式(每日增加喂料量:0、0.91kg、1.82 kg)中的一种进行饲喂。饲喂试验猪要符合母猪胎龄和体况评分要求。分娩前14 d开始按试验规定的喂料量饲喂妊娠母猪。分娩前两天,试验母猪转入产房,在此,改用哺乳料,饲喂量减至每天1.82 kg,直到分娩。妊娠日粮配方中赖氨酸总量达到0.55%,所有其他的营养成分均达到或超过NRC(1998)要求。分娩时按窝称量每头仔猪吃奶前的个体初生重。所有非试验母猪分娩后称量吃奶后的仔猪总窝重。所有的记录均应把死胎和木乃伊胎儿纳入分析范围,结果组与组之间总产仔数和活仔数差异不显著。窝仔重、产活仔总重、仔猪个体重和死胎个体重在经产母猪(2胎或以上)之间差异不显著。不管如何,日喂料量增加1.82 kg的头胎母猪组与日喂料不增加的头胎母猪相比,窝仔重明显重,差异显著(P=0.019),分别为18.7 kg∶16.1 kg;同样,活仔总重也明显重,差异显著(P=0.030),分别为16.6 kg∶15.1 kg。此外,日喂料量增加1.82 kg的头胎母猪组与日喂料不增加的头胎母猪相比,活仔个体初生重明显要重,差异显著(P0.001),分别为1.438 kg∶1.312 kg。基于这些数据,从妊娠100 d到分娩前,头胎母猪日喂料量增加1.82 kg,可以提高仔猪初生重,但对经产母猪,无助于提高其仔猪初生重。 相似文献
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多花黑麦草饲喂肉猪效果的研究 总被引：15，自引：2，他引：13
试验在猪日粮中加入 2 5 .73%～ 4 4 .0 4 %的多花黑麦草鲜草 (以干物质计的实际采食量 )饲喂育肥期的二元杂交肉猪 ,结果证明多花黑麦草在日粮中由 10 %增至 2 0 %时 ,日增重由 5 84 g/ (头·天 )增至 60 0 g/ (头·天 ) ;而多花黑麦草在日粮中由 30 %增至 5 0 %时 ,日增重由 5 12 g/ (头·天 )降至 4 5 6g/ (头·天 )。第 86天时 ,各试验组间的日增重差异极显著 (P<0 .0 1)。随着多花黑麦草在日粮中的替代量增加 ,料肉比 3.2 2∶ 1降至 2 .12∶ 1,各育肥组出栏时 ,饲料牧草干物质的转化效率为 3.15～ 3.5 1kg(消耗的 DM/ 1kg活重 )。试验组 5比对照组减少精料消耗 30 .5 0 % ,每头猪节约精料 4 9.16kg,增加收入 5 1.30元。饲喂多花黑麦草对育肥猪的屠宰率、瘦肉率和品质无显著影响。 相似文献
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Two experiments were conducted to investigate a feeding regimen in which a programmed amount of feed was offered daily to control growth rate of steers. In Exp. 1, steers (n = 107, 309 +/- 3 kg) were used to determine effects of offering ad libitum access to feed (AL) vs a programmed intake feeding regimen (PI) and the number of days steers were fed (168 vs 203) on performance and carcass characteristics. Steers in the programmed intake feeding regimen were fed to achieve a predicted gain of 1.13 kg/d for the first 78 kg of gain, 1.36 kg/d for the next 124 kg of gain, and were given ad libitum access to feed for the final 54 or 103 kg of gain before slaughter (for steers fed for 168 d or 203 d, respectively). Feed efficiency was greater (P < 0.02) for steers in the PI than for those in the AL feeding regimen (0.193 vs 0.183 kg gain/kg feed, respectively). From d 169 to 203, steers in the PI feeding regimen had greater (P < 0.06) ADG (1.60 vs 1.38 kg/d) and similar (P = 0.38) feed efficiency than steers in the AL regimen. In Exp. 2, steers (n = 96; 308 +/- 3 kg BW) were offered feed ad libitum throughout the experiment (AL) or were programmed to gain at a high (PI-H) or low (PI-L) growth rate. For the first 78 kg of gain, intake was restricted to achieve predicted gains of 1.13 kg/d (PI-L) or 1.25 kg/d (PI-H). For the next 124 kg of gain, intake was restricted to achieve predicted gains of 1.36 kg/d (PI-L) or 1.47 kg/d (PI-H). Feed was offered ad libitum for the final 58 kg of gain. Overall ADG was similar (P > 0.37) among feeding regimens despite lower DMI for the steers in the PI-L and PI-H feeding regimens than for those in the AL regimen. Feeding regimen did not affect (P < 0.22) carcass characteristics. Programmed intake feeding regimens sustained growth rate and feed efficiency for an extended period of time without detrimental effects on carcass characteristics. 相似文献
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《中国畜牧杂志》2019,(8)
本试验旨在研究夏季不同饲喂次数和料水比对两广小耳花猪生产性能的影响,选择48头两广小耳花猪哺乳母猪,分为4组,每组12头母猪。4个处理组的饲喂方式分别为饲喂2次/d和料水比为1∶2.5(对照组)、饲喂2次/d和料水比为1∶3.5、饲喂3次/d和料水比为1∶2.5、饲喂3次/d和料水比为1∶3.5。监测母猪从产后至断奶25 d的采食量、仔猪生长性能以及环境温湿度等指标。结果表明:饲喂3次/d与2次/d母猪的日平均采食量分别为3.33、2.41 kg,哺乳期间母猪平均总采食量前者较后者高23 kg/头;哺乳仔猪平均断奶窝重分别为32.35、29.14 kg,窝增重前者较后者高3.17 kg/窝。综上,通过增加饲喂次数和选择与人工作息时间不一致的时间点饲喂可以提高哺乳母猪的采食量,但需要智能化自动化饲喂设备相配套。 相似文献
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本试验选取63头体重约20kg的杜长大三元杂交育肥仔猪,随机分成3组,每组21头,三组分别饲喂基础日粮、基础日粮+0.5%板蓝根(G1)、基础日粮+1%板蓝根(G2),预饲期7d,预饲期结束后进入试验期150d。结果显示:与对照组相比,试验组G1、G2平均末重分别提高18.15kg、18.12kg,平均日增重分别提高121.06g、121g,平均日耗料量分别降低60g、50g,差异均显著(P<0.05);对照组料重比最高,为3.48±0.16,G1料重比为2.76±0.18最低;G1、G2组间差异均不显著(P>0.05);对照组发病率高达47.6%,死亡率为4.8%,G1、G2组发病率分别为14.3%、19.0%,死亡率均为0%;饲养成本G1最低为21553.56元,对照组最高为23773.1元;对照组猪只平均增重成本为14.68元/kg,G1、G2组分别为10.34元/kg、10.98元/kg。综合末重、日增重、料重比、发病率、饲养成本及增重成本等因素,板蓝根添加剂以0.5%的添加比例为最优。 相似文献
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本研究开展了30 d的饲养试验以确定可消化钙水平对饲喂不同磷含量日粮生长猪生长性能和骨成分的影响。试验选择平均体重为(50.21±2.1)kg的生长猪180头,随机分为15组,每组12头猪,每个重复4头猪。试验日粮采用3×5因子设计,可消化磷水平分别为1.4、2.7、4.1 g/kg,可消化钙水平分别为1.3、2.5、3.8、5.0,和6.3 g/kg。结果表明,日粮可消化钙和可消化磷水平对生长猪末重、日增重、饲料报酬、骨钙和骨磷含量的影响具有显著交互作用(P<0.05)。在可消化钙磷比值分别为1.20∶1和1.25∶1,可消化磷水平为2.7 g/kg时,预测的最大体重为87.20 kg,日增重为1.23 kg。但由于方程的线性性质,没有得到预测的最大饲料报酬。随着日粮可消化钙水平的增加,无论饲粮中可消化磷水平是多少,平均日采食量均表现为显著降低(P<0.05)。可消化磷含量为2.7和4.1 g/kg时,预测的骨骼灰分最大值分别为55.8和60.1 g/kg,对应的可消化钙磷比值分别为2.03∶1和1.59∶1。综上所述,当日粮磷水平达到或低于需要水平时,过量的钙对50~85 kg猪生长性能具有负面影响。而当可消化钙水平高于需要水平时,饲粮中含有高于需要水平的可消化磷可以使猪的生长性能最大化。骨灰分最大化所需的可消化钙水平大于生长性能最大化需要的可消化钙水平,同时当磷水平达到需要量时,保证足够的骨矿化而不影响生长性能所需的可消化钙磷比为1.23∶1。 相似文献
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1. Two experiments were conducted to determine the effects of level of inclusion of poultry by-product and enzyme-prebiotic supplementation on grower diet digestibility and the performance of broilers. 2. Six grower diets were formulated to provide a similar nutrient profile with the exception of using three graded levels of poultry by-product, namely 0, 25, 40 g/kg of the diet with and without supplementation of enzyme preparation at the rate of 1 kg per tonne of feed and prebiotic preparation at the rate of 2 kg per tonne of feed. The experimental diets were used from 3 to 6 weeks of age. 3. Body weights, feed intake and feed conversion efficiency were not affected by poultry by-product; however, enzyme-prebiotic had a significant positive effect on feed conversion efficiency at 0 to 6 weeks in experiment 1. 4. Crude protein digestibility was decreased by feeding the diet containing poultry by-product while ether extract digestibility was increased by poultry by-product at the rate of 25 g per kg of feed only. Dry matter retention, crude fibre digestibility and organic matter retention were not affected by poultry by-product. Dry matter and organic matter retentions, crude protein, ether extract and crude fibre digestibilities were not affected by enzyme-prebiotic. 5. Protein efficiency ratio (PER) values were increased by poultry by-product at the rate of 40 g per kg of feed and addition of enzyme-prebiotic. 相似文献
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The purpose of this research was to establish the influence of 3 j Cx cellulase applied per gram of COT concentrate mixture, fed in combination with a milk diet acidified by formic acid to the value of pH 4.6, on calf growth performance in one metabolism and two field experiments. In the metabolism experiment two groups of calves, with six animals in each, were fed acidified whole milk, which was diluted stage by stage till weaning at 60 days of age. The average live weight gain in the control at the end of the milk feeding period, i.e. from 14 to 60 days of age, was 29.90 kg. This corresponds to a daily live weight gain of 0.650 g. The total live weight gain of male calves in the experimental group was 29.30 kg, corresponding to a daily live weight gain of 0.638 g (Tab. I). Tab. II shows the average feed and nutrient intakes per kg live weight gain. The calves which received the enzyme supplement tend to have the higher feed conversion rate. During the forage feeding period, i.e. from 61 to 90 days of age, the average daily live weight gains were 1.10 kg and 0.980 kg in the control and experimental groups, respectively (Tab. III). The average live weight of 90 days old male calves was 107.70 kg and 103.90 kg in the control and experimental groups, respectively. The amount of consumed nutrients (digestible protein and starch units); in relation to the total feed intakes, is lower in the experimental groups, which proves the higher feed conversion rate (P less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
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不同饲养方式对猪生长性能影响的研究 总被引：1，自引：0，他引：1
分别选择斯格杂交商品猪60头,同时开展17～40 kg体重阶段的大群饲养（20头/栏）与小群饲养（10头/栏）对比试验,34～60 kg体重阶段的自由采食（10头/栏）与分餐饲喂（10头/栏）对比试验,试验期40 d。结果表明,大群饲养组生长速度比小群饲养组低4.95%（P>0.05）,其日采食量减少9.72%（P>0.05）,饲料转化效率提高5.45%（P>0.05）,头均获毛利减少0.14元;自由采食组生长速度比分餐饲喂组提高13.3%（P<0.05）,其日采食量增加16.87%（P<0.05）,饲料转化效率降低3.14%（P>0.05）,头均获毛利增加11.31元。 相似文献
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《The Professional Animal Scientist》2000,16(1):13-20
Four experiments were conducted to determine the effects of feed intake fluctuation, feeding frequency, time of feeding, and rate of gain on performance by limit-fed steers. Mean initial BW for steers in Experiments 1, 2, 3, and 4 were 378 ± 43, 225 ± 19, 227 ± 20, and 249 ± 17 kg, respectively. All experiments were complete random designs, and pen was the experimental unit. In Experiment 1, 10% daily variation in feed intake resulted in decreased (P<0.10) ADG and ratio of gain to feed (G/F) compared with steers fed either a constant amount or a 10% weekly variation in feed intake. In Experiment 2, steers fed once daily at 0800 h; once daily at 1700 h; twice daily at 0800 and 1700 h; or thrice daily at 0800, 1230, and 1700 h did not affect (P>0.10) ADG or G/F. Average daily gain and G/F by steers programed to gain 1.25 kg/d were not affected (P>0.10) by 10% fluctuation in feed intake or twice daily feeding in Experiment 3. Treatments used in Experiment 4 consisted of 1) steers fed to gain 0.9 kg/d, 2) steers fed to gain 0.9 kg/d with 10% daily feed intake fluctuation, 3) steers fed to gain 1.25 kg/d, and 4) steers fed to gain 1.25 kg/d with 10% daily feed intake fluctuation. Fluctuation in feed intake did not affect (P>0.10) ADG at either rate of gain. Results suggest that feed intake fluctuation in limit-fed cattle might decrease performance early in the feeding period; however, cattle seem to adapt to fluctuating feed intake as the feeding period progresses. Time and frequency of feeding did not affect performance by limit-fed steers. 相似文献
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智能饲喂对群养初产母猪生产性能影响的试验研究 总被引：2，自引：0，他引：2
为研究规模化猪场智能饲喂对群养初产母猪生产性能的影响,选用90头4月龄体重相近的长大二元初产母猪,随机分为智能化组、群养群饲组和限位栏组,每组30头母猪,测定初产母猪的生产性能。结果表明,情期受胎分娩率,智能化组比群养群饲组提高10个百分点（P＜0.05）,比限位栏组提高16.66个百分点（P＜0.01）;窝产仔数、窝产活仔数、初生窝重、泌乳力、窝断奶仔猪数和断奶窝重,智能化组比群养群饲组分别提高0.53头、0.81头、2.81千克、8.78千克、1.14头和9.42千克（P＜0.05）,比限位栏组分别提高1.01头、1.33头、4.86千克、12.92千克、1.68头和10.89千克（P＜0.01）;育成率,智能化组比群养群饲组和限位栏组分别提高3.9和6个百分点（P＜0.01）;返情率,智能化组比群养群饲组降低3.96个百分点（P＜0.05）,比限位栏组降低11.36个百分点（P＜0.01）;母猪淘汰率,智能化组为13.33%,比群养群饲组和限位栏组均降低3.34个百分点（P＜0.05）。智能化饲喂能显著提高母猪情期受胎分娩率和繁殖性能,降低返情率和淘汰率,提高其生产性能。 相似文献