共查询到17条相似文献，搜索用时 187 毫秒
1.
本试验旨在研究不同粉碎粒度对饲料加工质量的影响以及肉鸡不同粉碎粒度饲粮对不同生长阶段肉鸡生长性能的影响。选用864只1日龄白羽爱拔益加(AA)肉鸡,随机分为6组,每组8个重复,每个重复18只鸡,进行为期42 d的饲养试验,分为前期(1~21日龄)和后期(22~42日龄)2个阶段。前、后期饲粮分别采用1.5、2.0和2.5 mm筛片孔径进行粉碎,每个筛片孔径设4个重复。前期设3个组,1.5 mm组设24个重复,2.0 mm组设16个重复,2.5 mm组设8个重复;后期设6个组,将前期1.5 mm组平均分为3个组,2.0 mm组平均分为2个组,2.5 mm组不变,每组8个重复。结果表明:1)饲料的几何平均粒径随着筛片孔径的增加而增加,其中2.5 mm组的几何平均粒径显著大于1.5和2.0 mm组(P0.05);颗粒耐久性指数(PDI)、颗粒硬度和淀粉糊化度随着筛片孔径的增加而降低,其中1.5 mm组的PDI和颗粒硬度显著大于2.0和2.5 mm组(P0.05);随着筛片孔径的增加,各组饲料的粗蛋白质体外消化率无显著差异(P0.05)。2)1~21日龄时,2.0 mm组的21日龄平均体重、平均日采食量和平均日增重均为最高。22~42日龄时,前期2.0 mm、后期2.5 mm组的42日龄平均体重和平均日增重最高,料重比最低;前期1.5 mm、后期2.5 mm组的平均日采食量最高。综合以上结果,前期2.0 mm、后期2.5 mm组的生长性能最好。所以,肉鸡前期饲粮采用筛片孔径为2.0 mm、后期饲粮采用筛片孔径为2.5 mm进行粉碎,生长性能最佳。 相似文献
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环模模孔参数对颗粒饲料加工质量及肉鸡生长性能的影响 总被引：1，自引：0，他引：1
本试验旨在研究环模模孔参数对颗粒饲料加工质量及肉鸡生长性能的影响。通过固定模孔直径(3mm)改变模孔长径比(6∶1、8∶1、10∶1)以及固定模孔长径比(10∶1)改变模孔直径(3.0、3.5、4.0mm),生产5种不同直径及硬度的肉鸡颗粒饲料。选取864只体重相近的21日龄爱拔益加(AA)肉鸡,随机分成6组,每个组8个重复,每个重复18只。Ⅰ~Ⅴ组分别饲喂模孔直径和长径比分别为3.0mm和6∶1、3.0mm和8∶1、3.0mm和10∶1、3.5mm和10∶1、4.0mm和10∶1的颗粒饲料;Ⅵ组分2阶段饲喂,22~35日龄饲喂模孔直径和长径比为3.0 mm和10∶1颗粒饲料,36~42日龄饲喂模孔直径和长径比为4.0mm和10∶1颗粒饲料。试验期21d。结果表明:1)模孔直径相同时,颗粒硬度随着模孔长径比的增加而极显著提高(P0.01);模孔长径比相同时,颗粒硬度随着模孔直径的增加而极显著提高(P0.01)。各组颗粒耐久性指数(PDI)无显著差异(P0.05),且都高于95%。2)模孔直径相同时,随着颗粒硬度的增加,肉鸡终末体重、平均日增重均逐渐降低,料重比逐渐升高。Ⅰ组的终末体重和平均日增重显著或极显著高于Ⅲ组(P0.05或P0.01),Ⅰ组料重比显著低于Ⅱ、Ⅲ组(P0.05)。3)模孔长径比相同时,各组终末体重、平均日增重和平均日采食量均无显著差异(P0.05);随着颗粒直径的增加料重比逐渐降低,且Ⅲ组料重比显著高于Ⅴ组(P0.05)。综上所述,模孔长径比和直径的增大均会显著提高颗粒硬度。在一定范围内,提高颗粒硬度会使肉鸡终末体重和平均日增重降低,料重比升高,而增大颗粒直径则会使料重比降低。 相似文献
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本试验旨在研究同一配方下,玉米不同粉碎粒度对颗粒饲料加工质量和育肥猪生长性能的影响。选用1.5/2.0、2.0/2.0、2.0/2.5、2.5/2.5、2.5/3.0和3.0/3.0 mm孔径的筛片对玉米进行粉碎,分别得到几何平均粒径为303.91、346.08、356.81、358.51、373.29和387.70μm的玉米原料,采用同一配方和相同的加工参数(其他原料粉碎筛片孔径2.0 mm,制粒调质温度80℃、模孔直径3.0 mm、长径比9∶1)加工成含不同粉碎粒度玉米的饲粮。选取108头平均体重为(62.68±5.59)kg的"杜×长×大"杂交猪,随机置于6个组(每个组3个重复,每个重复6头猪,公母各占1/2),分别饲喂含不同粉碎粒度玉米的饲粮,试验周期为8周。结果表明:随着筛片孔径的增大,粉碎能耗从9.02 k W·h/t降低到6.86 k W·h/t,制粒能耗从19.06 k W·h/t升高到22.30 k W·h/t;粗蛋白质体外消化率随玉米粉碎粒度的增加呈现上升的趋势,其中2.5/2.5 mm组最高,且显著高于1.5/2.0 mm组(P0.05);颗粒硬度2.5/3.0、3.0/3.0 mm组显著高于其他组(P0.05);随粉碎粒度的增加饲粮干物质表观消化率降低,其中1.5/2.0和3.0/3.0 mm组分别为84.43%和80.62%,后者比前者降低了4.5%,且差异显著(P0.05);随玉米粉碎粒度的增加饲粮粗蛋白质表观消化率整体呈现下降的趋势,且1.5/2.0 mm组粗蛋白质表观消化率为86.14%,与其他各组差异显著(P0.05);各组平均日增重和料重比均无显著性差异(P0.05),2.5/2.5 mm组平均日采食量最高,但与各组间无显著性差异(P0.05)。根据本试验结果,建议育肥猪饲粮玉米粉碎粒度采用2.5/2.5 mm筛片孔径。 相似文献
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<正>为保证颗粒饲料质量,降低制粒工序能耗,通过不同调质温度对颗粒饲料质量及制粒生产率影响的试验,揭示颗粒饲料生产中较适宜的调质温度,为企业生产提供参考。采用四种调质温度:55℃、60℃、65℃、70℃。粉碎机所用筛片的孔径2 mm,制粒机压缩比为10,模孔直径为4.5mm,调质时间为10s,蒸汽量为物料量的5%,蒸汽压力0.3 MPa。对乳猪颗粒饲料粉状半成品进行试验,试验表明:调质温度升高,颗粒饲料的粉化率显著下降(P0.05),硬度、成形率显著提高(P0.05),制粒生产率显著提高(P0.05), 相似文献
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《饲料工业》2017,(21):32-36
试验旨在研究同一配方条件下,不同颗粒直径对饲料加工品质(硬度、耐久性)的影响以及不同颗粒直径组合对肉鸡生长性能的影响。试验共选用864只1日龄AA肉鸡,随机分为8个处理组,0~21 d饲喂破碎料,22~42 d饲喂不同颗粒直径组合颗粒饲料,对8个处理组进行为期42 d的饲养试验。试验结果表明,饲料颗粒硬度随颗粒直径的增加而显著提高(P<0.05),颗粒耐久性指数(PDI)随颗粒直径的增加而显著降低(P<0.05)。不同颗粒直径对肉鸡生长性能影响不显著,但饲喂第4处理组(22~35 d饲喂颗粒直径3 mm饲料、36~42 d饲喂颗粒直径4 mm饲料)颗粒料的肉鸡平均日增重最大、日采食量也相对较大、而料重比较小,所以在肉鸡饲养过程中建议22~35 d饲喂颗粒直径3 mm的颗粒料、36~42 d饲喂颗粒直径4 mm的颗粒料。 相似文献
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仔猪配合饲料的粉碎粒度研究 总被引：3，自引：0，他引：3
对同一配方的仔猪饲料,在玉米、豆粕粉碎时分别选用直径 4.5mm、 3.0mm和 2.5mm筛孔的粉碎机筛片粉碎,制成 3种产品,用来饲喂 23kg体重的仔猪,作对比试验。结果表明,选用直径 3.0mm筛孔粉碎加工的全价料在相同条件下,料肉比较选用直径 4.5mm筛孔的试验组增加 10.1％ ,比选用 2.5mm筛孔的对照组增加 9.6％;采用直径 3. 0mm孔径筛片的试验组的粗蛋白表观消化率较 4.5mm和 2.5mm筛片组分别提高 8.1％和 7.9％。综合以上各方面因素,筛选出直径 3.0mm孔径筛片为生产该仔猪饲料的粉碎机最佳筛片孔径。 相似文献
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本试验对21、42和56日龄的2个品种肉鸡胰腺、十二指肠和空肠前段食糜脂肪酶活性及回肠末端食糜粗脂肪表观消化率进行了测定和比较.以AA肉鸡和北京油鸡为试验动物,将不同日龄的每个品种肉鸡随机分为3组,每组4个重复,每个重复8只鸡.分别于21、42和56日龄宰杀每个重复5只体重相近的肉鸡,获取的胰腺、十二指肠、空肠前段和回肠末端食糜分别用于测定脂肪酶活性和粗脂肪表观消化率.结果表明:AA肉鸡胰腺脂肪酶活性在42日龄时达到最高,从42到56日龄开始逐渐降低;小肠食糜脂肪酶活性21日龄极显著高于42和56日龄(P＜0.01),粗脂肪表观消化率与胰腺脂肪酶活性变化趋势相同.北京油鸡56日龄胰腺脂肪酶活性最高,小肠食糜脂肪酶活性42和56日龄低于21日龄,但3个日龄间粗脂肪消化率差异不显著(P＞0.05).整个试验期间,3个相应日龄北京油鸡小肠食糜脂肪酶活性高于AA肉鸡,其中21和56日龄时差异显著(P＜0.05),粗脂肪消化率同样高于AA肉鸡,但只有56日龄时差异显著(P＜0.05). 相似文献
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本试验旨在研究在颗粒饲料中小麦粉碎粒度与添加量对20～50日龄817白羽肉鸡生长性能、肠道形态和肠道消化酶活性的影响。采用2×3两因素试验设计，其中小麦添加量分别为35%和55%，小麦粉碎筛片孔径分别为1.5、2.5和3.5 mm。选取720只20日龄、健康的817快大型白羽肉仔鸡（全公苗），按照体重相近的原则随机分成6组，每组6个重复，每个重复20只鸡。试验期31 d，分中鸡（20～34日龄）和大鸡（35～50日龄）2个阶段进行。结果表明：1）在试验各阶段，各组间肉鸡生长性能无显著性差异（P>0.05）。主效应分析结果表明，2.5 mm粉碎筛片孔径组35～50日龄料重比（F/G）显著低于其他2组（P<0.05）。2)35日龄时，主效应分析结果表明，1.5 mm粉碎筛片孔径组肉鸡十二指肠和空肠绒毛高度显著高于2.5 mm粉碎筛片孔径组（P<0.05），十二指肠和空肠绒毛高度/隐窝深度（V/C）值以及回肠绒毛高度显著高于其他2组（P<0.05），回肠V/C值显著高于3.5 mm粉碎筛片孔径组（P<0.05）;35%添加量组回肠绒毛高度和V/C值显著高于55%... 相似文献
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为了探究玉米品种、储存时间和条件、粉碎机筛片直径对陈玉米粉碎粒度的影响,试验采集了国库储存不同年份的29个陈玉米样品、19个东北单一品种陈玉米样品,以及不同储存温度的玉米,通过孔径为3.60 mm和6.00 mm的筛片进行粉碎,采用筛分法测定粒度。结果表明:(1)不同储存时间的国库玉米粉碎粒度随储存时间的延长成波动变化,但无显著差异(P0.05);(2)储存在相对温度低的玉米粉碎粒度高于储存在相对温度高的玉米;(3)粉碎粒度与玉米粗蛋白质、粗脂肪、总淀粉和粗纤维含量没有显著的相关性(P0.05),但与玉米NDF、ADF含量呈现显著的负相关(P0.05);(4)筛片孔径显著影响陈玉米粉碎粒度(P0.01),相对于3.60 mm孔径的筛片,使用6.00 mm孔径筛片粉碎玉米能大幅度提高颗粒度大于2 000μm玉米颗粒的比例(几乎提高8倍),并降低颗粒度小于850μm玉米颗粒的比例。由此可知,长时间储存和高温储存导致玉米脆性增加、粉碎粒度变小,提高粉碎机筛片直径可以增加陈玉米的粉碎粒度。 相似文献
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Abdollahi MR Ravindran V Wester TJ Ravindran G Thomas DV 《British poultry science》2010,51(5):648-657
1. The influence of conditioning temperature on the performance, nutrient utilisation and digestive tract development of broilers fed on maize- and wheat-based diets was examined up to 21 d of age. The experimental design was a 2 × 3 factorial arrangement of treatments evaluating two grain types (maize and wheat) and three conditioning temperatures (60°C, 75°C and 90°C). Broiler starter diets, each based on one grain (maize or wheat), were formulated and pelleted at the three temperatures. 2. Increasing conditioning temperature decreased the body-weight gain and feed intake in wheat-based diets, but birds fed on maize-based diets conditioned at 60°C and 90°C had higher body-weight gain and feed intake than those fed on the diet conditioned at 75°C. Increasing conditioning temperature increased feed per body-weight gain in both grain-type diets but improved pellet durability index (PDI) only in wheat-based diets; PDI was unaffected in maize-based diets. 3. In wheat-based diets, increasing conditioning temperature decreased the ileal digestibility of nitrogen and starch. Ileal nitrogen digestibility of maize-based diets conditioned at 60°C and 90°C was higher than at 75°C. Starch digestibility was unaffected by conditioning temperature in maize-based diets. No effect of conditioning temperature was found for apparent metabolisable energy (AME). Increasing conditioning temperature decreased digestible protein and AME intakes in wheat-based diets but, in maize-based diets, birds fed on the diet conditioned at 75°C had lower digestible protein and AME intakes compared to those fed on diets conditioned at 60°C and 90°C. 4. Small intestine was longer in birds fed on diets conditioned at 75°C and 90°C compared with those fed on diets conditioned at 60°C. 5. Overall, the data suggest that while the effects of conditioning temperature on body-weight gain and feed intake of broilers to 21 d of age differed depending on the grain type, feed per body-weight gain was adversely affected by higher conditioning temperatures. 相似文献
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本试验旨在探究粗脂肪水平和不同调质温度对颗粒饲料硬度的影响。在粗脂肪水平分别为3.37%、4.0%和4.65%时,调质温度为60℃、70℃和80℃时进行制粒为9种饲料,测定制粒后不同风干时间颗粒饲料的硬度、颗粒耐久性指数(PDI)等加工质量指标。结果表明:对于未经风干的颗粒饲料,当调质温度为60℃,当粗脂肪含量由3.37%提高到4.65%时,颗粒饲料硬度降低了30.6%(P0.05);而当粗脂肪含量为3.37%,调质温度从60℃升高到80℃,颗粒饲料硬度升高了138.5%(P0.05);与粉料相比,调质温度为60℃、70℃和80℃时颗粒饲料淀粉糊化度分别显著增加了67.9%、88.1%和130.5%(P0.05);随着颗粒饲料风干时间的延长,饲料水分降低,颗粒硬度却随之增加(P0.05);PDI与颗粒硬度呈显著的正相关(R~2=0.954,P0.05)。综上可知,颗粒饲料的粗脂肪含量、调质温度和水分含量均会影响颗粒饲料的硬度。在实际生产过程中,可通过提高调质温度,降低饲料中粗脂肪或水分含量,进而提高颗粒饲料的硬度。 相似文献
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本研究旨在评价不同水分和颗粒粒度的高粱制粒或膨化对不同原料粒度、肉鸡代谢能、氨基酸回肠消化率和肉鸡生长性能的影响。试验以720只雄性雏鸡为研究对象,随机分为6组,每组6个重复,每个重复20只。试验处理以2×2×2因子设计,即2种加工方式(制粒和膨化),2个调质水分(1.6%和0.8%),2个颗粒粉碎粒度(650和850μm)。结果显示:在添加1.6%水分的膨化日粮中,制粒制粒和颗粒耐久指数较高。850μm的粒径增加了饲料颗粒耐久指数。各处理组对肉鸡日增重和屠体性状均无显著影响(P>0.05)。在10~13 d饲喂颗粒饲料和添加1.6%水分的饲料的肉鸡表观代谢能和氮校正代谢能均较高(P<0.05),与添加膨化性饲料相比,高粱制粒饲料回肠赖氨酸和甘氨酸消化系数显著提高(P<0.05)。在评价饲料加湿效果时,饲料添加1.6%水分后赖氨酸、蛋氨酸、胱氨酸、甘氨酸、组氨酸、异亮氨酸和精氨酸回肠表观消化系数显著升高(P<0.05)。1.6%水分的膨化饲料较0.8%水分显著提高了21 d肉鸡采食量(P<0.05),在42 d时,0.8%水分的颗粒饲料显著提高了采食量(P<0.05)。结论:以650μm的粉碎粒度和1.6%的水分制备颗粒饲料在肉鸡生长后期可以提高回肠氨基酸消化率和表观代谢能,而膨化工艺提高了42 d肉鸡饲料颗粒制粒和饲料转化率。 相似文献
15.
Campbell JM Russell LE Crenshaw JD Behnke KC Clark PM 《Journal of animal science》2006,84(9):2501-2508
A series of 4 experiments evaluated effects of mash conditioning temperature from a pellet mill or expander on performance of broilers fed pelleted diets containing spray-dried plasma (SDP). All experiments utilized Ross x Ross 308 male broilers randomly assigned to their respective treatments (6 or 10 broilers/pen and 8 or 10 pens/treatment). Treatments in Exp. 1 consisted of a control (0% SDP), SDP coated postpelleting, or SDP blended into the meal prepelleting. Experiment 2 and 3 included the same 3 treatments as in Exp. 1 but with additional treatments of SDP blended into the meal and conditioned at 90 or 95 degrees C before pelleting. In Exp. 4, treatments consisted of a control (0% SDP) or SDP blended into the meal and pelleted (85 degrees C conditioning temperature) or expanded (149 degrees C final effective temperature) and then pelleted. Corn-soybean meal-based diets were formulated to be equal in lysine and ME in all experiments. Pelleted diets were conditioned for 15 s at 85 degrees C, and expanded diets were conditioned at 95 degrees C, 29.7 MJ/t, 13.95 kg/cm2 cone pressure, exit temperature of 149 degrees C, and then pelleted through a 4 x 32-mm die. In Exp. 1, ADG and feed intake were improved (P < 0.05) for broilers fed SDP from d 1 to 28 of age, with greater BW at d 42. In Exp. 2, both in early (d 1 to 28 of age) phases, and overall (d 1 to 42 of age), broilers fed SDP had improved (P < 0.05) gain and efficiency. In Exp. 3, ADG, feed intake, efficiency of gain, and BW were improved (P < 0.01) for broilers fed SDP from d 1 to 21 of age, regardless of conditioning temperature. In Exp. 4, broilers fed SDP had improved (P < 0.05) gain, BW, and feed intake regardless of processing method. Overall, the results of all of the experiments demonstrated that pellet conditioning temperature from 85 to 95 degrees C and expander temperatures to 149 degrees C did not impair the positive growth effects of SDP in pelleted or expanded broiler feed. 相似文献
16.
《The Journal of Applied Poultry Research》2018,27(1):51-58
An experiment was conducted to investigate the effects of the feed form and conditioning time of pelleted diets on pellet quality, broiler performance and nutrient digestibility during the starter phase. A total of 480 male Cobb broilers were distributed according to a completely randomized experimental design into six treatments with eight replicates each. Treatments consisted of a mash diet and five crumbled diets submitted to different conditioning times (zero, 60, 80, 100, or 120 seconds). The broilers fed pelleted diets submitted to steam conditioning presented higher feed intake and BW gain (P ≤ 0.05), higher coefficient of ileal apparent digestibility (CIAD) of DM and CP, as well as higher ileal digestible energy (IDE) (P ≤ 0.05) than those fed the mash diet. However, treatments did not influence FCR or starch digestibility (P > 0.05). Feed intake increased linearly (P ≤ 0.05) with conditioning time while a quadratic response (P ≤ 0.05) was noted for IDE. Conditioning time did not affect the amount of intact pellets or protein solubility (P > 0.05), but increased pellet durability index (P ≤ 0.01), pellet hardness (P ≤ 0.05), and water activity (P ≤ 0.05). It was concluded that feed physical form and conditioning time influence the performance and nutrient digestibility in starter broilers. and that increasing conditioning times promote better pellet quality. 相似文献
17.
M.R. Abdollahi V. Ravindran T.J. Wester G. Ravindran D.V. Thomas 《British poultry science》2013,54(3):337-345
1. The influence of pellet diameter and length on the quality of pellets and performance, nutrient utilisation and digestive tract development of broilers given wheat-based diets was examined from 10 to 42 d of age. The experimental design was a 2 × 2 factorial arrangement of treatments evaluating two pellet diameters (3 and 4.76 mm) and two pellet lengths (3 and 6 mm). From 0 to 9 d of age, all birds were offered a common starter diet pelleted with a 3-mm diameter die and 3-mm length. Broiler grower (d 10 to 21) and finisher (d 22 to 42) diets, based on wheat, were formulated and then subjected to the 4 different treatments.
2. In grower diets, increasing pellet diameter and pellet length reduced the gelatinised starch (GS) content of the diets. In finisher diets, GS content of 3-mm diameter pellets did not change with increasing pellet length but decreased in 4.76-mm diameter pellets.
3. In grower and finisher diets, increments in intact pellet weight, pellet durability index and pellet hardness with increasing pellet length were greater in 3-mm diameter pellets than those with 4.76-mm diameter.
4. Increasing pellet length from 3 to 6 mm increased apparent metabolisable energy values. Neither the interaction nor main effects were significant for the ileal digestibility of nitrogen and starch.
5. During the grower period (d 10 to 21), birds given pellets of 6-mm length had greater body-weight gain than those given 3-mm length pellets. Feeding 6-mm length pellets decreased feed per body-weight gain compared to 3-mm length pellets. During the finisher (d 22 to 42) and whole grow-out (d 10 to 42) periods, while different pellet lengths had no effect on feed per body-weight gain values at 3-mm pellet diameter, increasing the pellet length decreased feed per body-weight gain at 4.76-mm pellet diameter.
6. Increasing pellet diameter and pellet length reduced the relative length of duodenum. Birds given 3-mm diameter pellets had heavier proventriculus compared to those given 4.76-mm diameter pellets.
7. Overall, the data suggest that increasing the pellet length from 3 to 6 mm improved the body-weight gain and feed per body-weight gain during the grower period (d 10 to 21). While the positive effect on body-weight gain disappeared as the birds grew older, improvements in feed per body-weight gain were maintained over the finisher and whole grow-out periods only in 4.76-mm diameter pellets. Small diameter die holes and longer pellet lengths may be considered as potential manipulations to manufacture high-quality pellets under low conditioning temperatures. 相似文献