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1.
肉用种鸽日粮中ME,CP适宜水平研究 总被引：2，自引：0，他引：2
用９０对１岁美国王鸽分为９组，分别饲喂由１２．５％，１４．０％，１５．５％三个ＣＰ水平和１１７２３，１２３５１，１２９７９ＫＪ／ｋｇ三个ＭＥ水平组成的日粮。结果表明：含１２．５％ＣＰ和１１７２３ＫＪ／ｋｇＭＥ日粮的饲喂效果最好，２８日龄乳鸽体重达５０４ｇ，日增重和饲料转化率均显著地高于其它各组；含ＣＰ１２．５％，ＭＥ分别为１１７２３和１２３５１ＫＪ／ｋｇ两种日粮的２８日龄乳鸽体重差异不显著，但日粮中能蛋比低于８９．１ＫＪ／ｇ或高于９８．３ＫＪ／ｇ后其体重明显地低于其它各组；乳鸽周龄不同对日粮中蛋能比的要求也各异，１～４周生长速度最快组日粮能蛋比分别是８３．６，８０．０和９３．８ＫＪ／ｇ。 相似文献
2.
本试验旨在研究益生菌对犊牛生长性能和血清生化指标的影响。选取 ２４头新生荷斯坦犊牛，随机分为 ４组，每组公母各 １／２，分别饲喂基础饲粮（Ａ组，由代乳粉、开食料和羊草组成）、基础饲粮 ＋地衣芽孢杆菌（Ｂ组）、基础饲粮 ＋地衣芽孢杆菌与枯草芽孢杆菌的复合菌（Ｃ组，复合菌中各菌菌数比例为 １∶１）、基础饲粮 ＋地衣芽孢杆菌、枯草芽孢杆菌和植物乳酸杆菌的复合菌（Ｄ组，复合菌中各菌菌数比例为 １∶１∶１）。每头牛食入益生菌总数为 ２×１０１０ＣＦＵ／ｄ。试验期共 ８周，分 ０～２周龄、２～４周龄、４～６周龄和 ６～８周龄 ４期。每 ２周空腹称重、测量体尺、采血 １次，每天记录采食量和粪便评分情况。试验 ０～８周龄，Ｂ组的平均日增重显著高于 Ａ组（Ｐ＜０．０５），试验各组的料重比差异不显著（Ｐ＞０．０５）；第 ８周龄时，Ｂ组和 Ｄ组的体躯指数均显著高于 Ａ组（Ｐ＜０．０５）；试验各组采食量和犊牛粪便评分差异不显著（Ｐ＞０．０５）；血清生化指标不受本试验处理因素影响（Ｐ＞０．０５）。结果表明，饲粮中添加地衣芽孢杆菌单菌提高了犊牛 ０～８周龄的平均日增重和８周龄的体躯指数，添加地衣芽孢杆菌与枯草芽孢杆菌和植物乳酸杆菌的复合菌提高了犊牛８周龄的体躯指数，添加益生菌对犊牛血清生化指标没有显著影响。 相似文献
3.
应用间接免疫荧光法检测鸡传染性贫血病病毒抗体的研究 总被引：4，自引：0，他引：4
用鸡传染性贫血病病毒（ＣＩＡＶ）ＭＳＢＩ－ＴＫ５８０３毒株感染的ＭＤＣＣ－ＭＳＢ；细胞涂片为抗原，建立了检测ＣＩＡＶ抗体的间接免疫荧光法（ＩＩＦＡ）。应用该ＩＩＦＡ方法对人工感染的ＳＰＦ鸡进行了检测１５只１日龄ＳＰＦ鸡在接种后第７、１４天时均呈阴性反应；２１天时２只鸡呈弱阳性反应，２８天时均呈弱阳性反应，２１天时２只鸡呈弱阳性反应，２８天时均呈弱阳性反应，３５天时呈明显阳性反应；１４只４０日龄ＳＰ 相似文献
4.
饲喂活菌制剂对肉仔鸡生产性能及盲肠主要菌群的影响 总被引：7，自引：0，他引：7
将１８０只艾维因肉仔鸡随机分为３组，每组１０个重复，进行７周长试验，研究活菌制剂对肉仔鸡生产性能和盲肠主要菌群（乳酸杆菌，大肠杆菌和厌氧菌总数）的影响，３个处理分别为：Ａ添加金霉素，Ｂ，添加１％腐植酸，Ｃ，添加１％活菌制剂（腐植酸作为载体），试验结果表明，添加活菌制剂组与添加座植酸组比较，可以提高１－４周龄肉仔鸡生长速度和饲料转化效率（Ｐ＜０．０５），其效果相当或超过添加金霉素的效果，添加活菌制剂可降低肉鸡的发病率，死淘率，提高成活率，因此在肉仔鸡饲料中添加活菌制剂在提高肉仔鸡生长速度，饲料转化效率和降低淘率等方面，可以取得替代金霉素等抗生素的使用交梨。 相似文献
5.
作者进行了双疗程法治疗肉鸡大肠杆菌病的试验，试验鸡共５０００只，设９个治疗组，１个对照组，每组５００只ＡＡ肉鸡。试验组鸡群于１～７天，２２～２８天，分别选用敏感抗菌素氟哌酸（ＦＰＡ，５０ＰＰＭ），强力霉素（ＤＯＣ。７５ＰＰＭ，），氯霉素（ＣＭＴ，７５０ＰＰＭ）进行双疗程治疗，取得了满意的效果。ＤＯＣ－ＣＭＴ、ＣＭＴ－ＤＯＣ、ＦＰＡ－ＤＯＣ、ＤＯＣ－ＦＰＡ、ＦＰＡ－ＣＭＴ、ＣＭＴ－ＦＰＡ、ＤＯＣ－ＤＯＣ、ＦＰＡ－ＦＰＡ、ＣＭＴ－ＣＭＴ各试验组的存活率分别为９２．８％、８７．６％、９７．２％、９６．４％、９５．８％、８９．６％、９４．６％、９６．２％、８８．４％。对照组的存活率７９．４％。 相似文献
6.
鸡缺锌对含硫氨基酸代谢的影响 总被引：7，自引：0，他引：7
选用２日龄雏鸡,用含锌量低（２８ｍｇ／ｋｇ）的基础饲料饲喂１周后,分为基础饲料组、基础饲料＋锌组、基础饲料＋含硫氨基酸（ＳＡＡ）组、基础饲料＋锌＋ＳＡＡ组,研究了鸡缺锌对ＳＡＡ代谢的影响。结果表明,鸡缺锌时,其体内ＳＡＡ同化作用减弱,异化作用增强,导致血清无机硫（ＳＯ２－４）、粪尿总硫及无机硫（ＳＯ２－４）极显著增多（Ｐ＜０．０１）;缺锌鸡增重、血清锌含量、血清碱性磷酸酶（ＡＫＰ）活性极显著下降（Ｐ＜０．０１）,并表现较典型的临床缺锌症状。添加ＳＡＡ能促进鸡对锌的吸收和利用,使血清锌含量和血清ＡＫＰ活性提高（Ｐ＜０．０１）。 相似文献
7.
鸡传染性贫血病毒的分离鉴定 总被引：8，自引：0，他引：8
在山东省从死亡率达７２％,混合感染多种病原微生物的海兰蛋白鸡和艾维茵肉鸡群中分离到３株鸡贫血病毒（ＣＡＶ）这些毒株耐体积分数５０％氯仿和７０℃水浴１５ｍｉｎ,能在ＭＤＣＣ－ＭＳＢ１的细胞内增殖,用分离的细胞毒接种１日龄ＳＰＦ鸡呈现典型的难传染性贫血特征性的临床症状和病理变化;用间接免疫荧光检查感染的ＭＤＣＣ－ＭＳＢ１细胞涂片和鸡组织触片,可见特异的核内荧光,分离毒株能被ＣＡＶ－ＴＫ５８０３株抗血清 相似文献
8.
有机锗与MD疫苗接种对感染vMDV雏鸡血清干扰素和T淋巴细胞的影响 总被引：4，自引：0，他引：4
通过给父母代蛋鸡饲喂一定剂量Ｇｅ－１３２，获取富锗种蛋并孵化出雏鸡，取３６０只随机分成８组，即Ｃ，Ｄ，Ｅ，Ｆ，Ｉ，Ｊ，Ｋ和Ｌ组，每组４５只，另取普通雏鸡２７０只，随机分成４组，Ａ，Ｇ组各７５只，Ｂ，Ｈ组各６０只，以上各组施行人工感染ｖＭＤＶ，ＭＤ疫苗接种和饲料加锗等３种处理，于第１，１５，３０，４５，６０日龄时检测血清干扰素（ＩＦＮ）含量和外周血Ｔ淋巴细胞数，结果显示：（１）１日龄富锗雏鸡血清ＩＦ 相似文献
9.
雏鸡实验性锰缺乏症及高磷对缺锰影响的病理学研究 总被引：1，自引：1，他引：0
１５０只１日龄艾维茵（Ａｖｉａ）肉鸡随机分为５组，各喂以低Ｍｎ（基础日粮含锰１５．７ｐｐｍ），低Ｍｎ高Ｐ１（基础日粮＋Ｐ０．１５％），低Ｍｎ高Ｐ２（基础日粮＋Ｐ０．４５％）、补锰高Ｐ１（基础日粮＋Ｍｎ１００ｐｐｍ＋Ｐ０．１５％）和补Ｍｎ（基础日粮＋Ｍｎ１００ｐｐｍ）日粮，饲喂４周。低锰，低锰高Ｐ１、低锰高Ｐ２组第１周开始发病，第二周达高峰。发病症状为共济失调，跛行。单腿发病，病腿向外前侧伸展，严重 相似文献
10.
文章了氟化物对鸡体液免疫功能的影响。试验Ⅰ组和试验Ⅱ组在４～４２日龄分别喂含氟量为３００ｍｇ／ｋｇ和５００ｍｇ／ｋｇ的饲料,４３～５６日龄喂常规饲料,对照组在整个试验期内喂常规饲料。结果显示,在１～３周内,氟化物能促进ＮＤ病毒抗体和血清球蛋白的产生,显著提高外周血淋巴细胞ＡＮＡＥ阳性率;在４～８周内,鸡增重减慢,器官指数降低,对ＮＤ病毒抗体、ＤＲＢＣ抗体和血清球蛋白含量的产生没有影响。这表明,在短 相似文献
11.
为分析日粮中添加不同水平的芦苇对育肥期和田羊生长性能及表观消化率的影响,本研究选取75只6月龄、体重为（30.59±3.36）kg的和田羊,采用单因素完全随机试验设计,随机分为0、10%、20%、30%和40%芦苇水平,每组15只,试验期75 d。结果发现,20%和40%芦苇添加组的干物质采食量均极显著高于对照组（P< 0.01）;20%芦苇添加组的日增重显著高于对照组（P< 0.05）,10%、30%和40%芦苇添加组的日增重分别比对照组高出10.09%、5.64%和10.87%,但差异不显著（P> 0.05）;20%芦苇添加组的干物质、粗蛋白质、粗脂肪、中性洗涤纤维、酸性洗涤纤维、粗灰分、钙和磷的表观消化率均较高;各组的饲料单位成本与饲料总成本随着芦苇添加量的增加而增加,芦苇添加组的增重收益均高于对照组,10%芦苇添加组的经济效益最高。结果表明,日粮中添加20%芦苇时干物质采食量、日增重及干物质、粗蛋白质、粗脂肪的表观消化率均较好;考虑到饲料投入成本,日粮中添加10%芦苇经济效益最高。 相似文献
12.
In order to investigate the growth performance and apparent digestibility of Hetian sheep in fattening period response to adding reed in diet. Seventy-five Hetian sheep with 6 months old and body weight(30.59 kg±3.36 kg) were classified into 5 groups by single-factor completely random design of experiment, fifteen sheep were assigned to 0, 10%, 20%, 30% and 40% reed addition group. Each group was fed difference diet during the experimental period (75 d). The results showed that the DM intake of 20% and 40% reed addition groups were extremely significant higher than control group (P< 0.01), respectively. The daily gain of 20% reed addition group was significantly higher than control group (P< 0.05), the daily gain of 10%, 30% and 40% reed addition groups were higher than control group 10.09%, 5.64% and 10.87% (P> 0.05), respectively. The apparent digestibility of DM, CP, EE, NDF, ADF, crude ash, calcium and phosphorus in 20% reed addition group was relatively high. Each feed unit cost and total cost would be increase when the reed content of diet increase, the reed addition groups had a better weight gains economic efficiency than control group, and the 10% reed addition group was the best. The results suggested that the DM intake, daily gain and apparent digestibility of DM, CP and EE were better when the diet adding 20% reed. Considering that feed total cost, there were a better economic benefit when the diet adding 10% reed. 相似文献
13.
青鱼对8种饲料原料中营养物质的表观消化率 总被引：1，自引：0，他引：1
本试验旨在研究青鱼(Mylopharyngodon piceus)对国产鱼粉、蝇蛆粉、玉米蛋白粉、大豆粕、花生粕、棉籽粕、菜籽粕和米糠8种饲料原料干物质、粗蛋白质、氨基酸、粗脂肪、总磷和总能的表观消化率。试验饲料由70%基础饲料和30%待测饲料原料组成,并以0.1%的三氧化二钇(Y2O3)为外源指示剂。选取平均体重为(60.17±1.28)g的青鱼270尾,随机分成9组,每组3个重复,每个重复10尾鱼。对照组试验鱼饲喂基础饲料,试验组试验鱼分别饲喂1种试验饲料。饲喂1周后采用自排法收集粪便待测。结果表明:8种饲料原料的干物质、粗蛋白质、粗脂肪、总磷、总能以及总氨基酸的表观消化率的范围分别是62.17%～86.47%、83.34%～95.84%、78.93%～100.06%、37.33%～81.99%、66.75%～89.86%、86.33%～96.58%。在8种饲料原料中,玉米蛋白粉的干物质、总磷和总能的表观消化率最高,而大豆粕的粗蛋白质、粗脂肪和总氨基酸的表观消化率最高;棉籽粕的干物质和总能的表观消化率最低,米糠的粗脂肪和总磷的表观消化率最低。各饲料原料中总氨基酸表观消化率与粗蛋白质表观消化率的变化趋势一致,其中以蝇蛆粉最低。由此可见,大豆粕和玉米蛋白粉是青鱼的优质植物蛋白质源,可适量替代鱼粉;蝇蛆粉中粗蛋白质和氨基酸的消化率都较低,在青鱼饲料中的添加量不宜过高;花生粕、棉籽粕和菜籽粕也是较好的植物性蛋白质源,在青鱼饲料中适量添加既有利于饲料的营养平衡,还可降低饲料成本;米糠作为青鱼的能量原料必须保持新鲜,并控制其在饲料中的用量。 相似文献
14.
Feeding different dietary protein to energy ratios to Holstein heifers: effects on growth performance,blood metabolites and rumen fermentation parameters 
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下载免费PDF全文 L. F. Dong W. B. Zhang N. F. Zhang Y. Tu Q. Y. Diao 《Journal of animal physiology and animal nutrition》2017,101(1):30-37
Eighteen Chinese Holstein heifers average age 230 ± 14 days were allocated to 1 of 3 dietary crude protein (CP) to metabolizable energy (ME) ratios to examine the effects on growth performance, blood metabolites and rumen fermentation parameters with 90‐days experiment. Three different dietary CP:ME ratios were targeted based on the formulation of dietary CP contents of 10.85%, 12.78% and 14.63% on dry matter (DM) basis with similar ME contents (10.42 MJ/kg DM), which were categorized as low, medium and high dietary CP:ME ratios. The actual CP:ME ratios obtained in this study significantly increased from low to high CP:ME ratio groups with a value of 10.59, 11.83 and 13.38 g/MJ respectively. Elevated CP:ME ratios significantly increased CP intake (kg/day) and feed efficiency (FE) which was defined as dry matter intake as a proportion of average daily gain (ADG), whereas little difference was observed in body weight (kg), ADG (kg/day), DM intake (kg/day) and ME intake (MJ/day) among the three different CP:ME ratio groups. Increasing dietary CP to ME ratios significantly increased CP digestibility, whereas digestibility of DM and gross energy remained constant in the current experiment. Blood urea nitrogen and insulin‐like growth factor‐1 linearly increased with increasing dietary CP:ME ratios. There was significantly dietary treatment effect on rumen fermentation parameters including acetate, propionate, butyrate and total volatile fatty acids. Therefore, this study indicated that increasing dietary CP levels with similar energy content contributed to increased protein intake and its digestibility, as well as FE. Holstein heifers between 200 and 341 kg subjected to 13.38 dietary CP:ME ratio showed improved feed efficiency, nutrient digestibility, some blood metabolites and rumen fermentation characteristics for 0.90 kg/day rate of gain. 相似文献
15.
非淀粉多糖酶和植酸酶对肉仔鸡生长性能和养分利用性的影响 总被引：14，自引：1，他引：13
以 8 8 8只艾维因肉仔鸡为试验动物 ,研究添加非淀粉多糖酶 (40 0mg/kg)和植酸酶 (30 0mg/kg)对肉仔鸡的生长性能和养分利用性的影响。试验结果表明 :玉米 -菜粕 -豆粕日粮中添加非淀粉多糖酶 (减少 1.4 %AME)和植酸酶(减少 0 .0 8%非植酸磷 ) ,甚至再减少 0 .0 1%赖氨酸 ,都不会显著影响肉仔鸡 4 2日龄体重 (P >0 .0 5 ) ,但饲料转化率得到改善 ,死亡率降低。添加非淀粉多糖酶可提高AME和TME(P >0 .0 5 )和氮沉积量和氮表观消化率 (P >0 .0 5 )。非淀粉多糖酶对总磷的消化率没有显著影响 (P >0 .0 5 ) ,但同时添加非淀粉多糖酶和植酸酶 (减少 0 .0 8%非植酸磷 ) ,可显著提高总磷的表观消化率和真消化率分别为 16和 16 .1个百分点 (P <0 .0 5 )。 相似文献
16.
Esmaeilipour O Moravej H Shivazad M Rezaian M Aminzadeh S Van Krimpen MM 《British poultry science》2012,53(2):235-244
1. The objective of this experiment was to study the influences of xylanase and citric acid on the performance, nutrient digestibility, digesta viscosity, duodenal histology, and gut microflora of broilers fed on a wheat based diet. 2. The experiment was carried out as a 2?×?3 factorial arrangement with two concentrations of xylanase (0 and 200?mg/kg) and three concentrations of citric acid (0, 20 and 40?g/kg). A total of 408 one-day-old chickens with similar body weight were distributed into 24 pens with 17 birds/pen. Each dietary treatment was given to 4 replicate pens from 0 to 24?d of age. To determine the apparent nutrient digestibility, chromic oxide (3?g/kg) was added to the diets as an indigestible marker. 3. Xylanase significantly increased body weight gain at 24?d of age by 1·4% and improved gain-to-feed (G:F) by 3·6%. The inclusion of 40?g/kg citric acid decreased feed intake and body weight gain by 15·4% and 11·8%, respectively. The inclusion of 20?g/kg of citric acid decreased feed intake, but it did not affect body weight gain of broilers at 24?d of age. The inclusion of 20 and 40?g/kg citric acid improved G:F by 3·8 and 4·3% respectively. Xylanase significantly decreased the viscosity of digesta and improved retention of DM, CP, and energy. 4. Xylanase and citric acid did not have any effect on the histo-morphology of the duodenum and intestinal microbial population. 5. In conclusion, citric acid at 20?g/kg decreased feed intake, did not have a negative effect on body weight gain, and improved G:F. Xylanase decreased digesta viscosity, increased nutrient retention and consequently improved performance of broilers fed on a wheat based diet. 相似文献
17.
本试验旨在研究1～21日龄雌性肉仔鸡表观回肠可消化色氨酸需要量及饲粮色氨酸水平对肉仔鸡肉品质、抗氧化指标和免疫指标的影响。试验选取480只1日龄雌性商品代肉雏鸡,随机分成5个处理,每个处理8个重复,每个重复12只鸡。采用含0.170%色氨酸的玉米-豆粕-玉米蛋白粉型基础饲粮,分别在其中添加0、0.021%、0.042%、0.063%和0.084%晶体L-色氨酸,使饲粮色氨酸水平分别为0.170%、0.191%、0.213%、0.234%和0.248%。测定1～21日龄肉仔鸡生产性能、胸肌品质、抗氧化指标、免疫指标和21～25日龄肉仔鸡氨基酸表观消化率和表观回肠消化率。结果表明:饲粮色氨酸水平显著影响1～21日龄肉仔鸡采食量及增重(P<0.05),采食量及增重与饲粮表观回肠可消化色氨酸水平呈现二次曲线关系(P<0.05)。1～21日龄肉仔鸡获得最大增重的饲粮表观回肠可消化色氨酸水平为0.176%,表观回肠可消化色氨酸摄入量为68.15 mg/d。与饲粮色氨酸水平0.170%相比,饲粮色氨酸水平0.213%及0.248%可显著降低肉仔鸡胸肌丙二醛含量、肝脏总超氧化物歧化酶活性和血清谷丙转氨酶活性(P<0.05),饲粮色氨酸水平0.248%可显著提高肉仔鸡屠宰后45 min胸肌pH、肠道总分泌型免疫球蛋白A浓度及血清总免疫球蛋白A浓度(P<0.05)。由此可知,1～21日龄雌性肉仔鸡获得最大增重的表观回肠可消化色氨酸需要量为0.176%(68.15 mg/d)。提高饲粮色氨酸水平可减轻肉仔鸡组织细胞脂质过氧化损伤,降低屠宰后肉仔鸡胸肌酸度,改善肉仔鸡肠道黏膜免疫和体液免疫能力。 相似文献
18.
本试验旨在研究鳙鱼(Aristichthys nobilis)对鱼粉(国产)、干酒糟及其可溶物(DDGS)、菜籽粕、米糠、豆粕、酶解羽毛粉、棉籽粕、小麦麸、玉米蛋白粉和花生粕中干物质、粗蛋白质、粗脂肪、总能以及氨基酸的表观消化率。试验饲料按照基础饲料和待测饲料原料7∶3的比例构成,并添加0.5%的三氧化二钇(Y2O3)作为外源指示剂。挑选初体重为(290.02±2.82)g的鳙鱼,随机分成11组,每组3个重复,每个重复10尾鱼。随机选取1组作为对照组投喂基础饲料,剩余10组为试验组分别投喂试验饲料。投喂1周后通过虹吸法收集粪便。结果表明:1)10种饲料原料中干物质、粗蛋白质、粗脂肪和总能的表观消化率的范围分别为69.9%~85.7%、73.5%~88.3%、81.2%~91.1%和81.9%~86.3%。2)在10种饲料原料中,米糠总能的表观消化率最高,而鱼粉的干物质、粗蛋白质和粗脂肪的表观消化率最高;酶解羽毛粉的干物质、粗脂肪和总能的表观消化率最低,玉米蛋白粉的粗蛋白质的表观消化率最低。3)各饲料原料氨基酸的表观消化率基本维持在65.59%~99.17%,且都以小麦麸较低。由此可见,鳙鱼对鱼粉具有很好的利用效果,其次是豆粕和花生粕,而酶解羽毛粉中粗蛋白质的表观消化率最低,小麦麸各氨基酸的表观消化率均比较低。 相似文献
19.
FENG Yan ZHANG Fen-que XUE Zhi-quan FAN Xin-feng ZHANG Jin-qiang LI Jian-hui 《中国畜牧兽医》2017,44(3):732-739
This research was to study the effect of bacterial lipopolysaccharide (LPX) and dexamethasone (DEX) on the growth performance,nutrient metabolism and blood biochemical indexes and intestinal morphology development of broiler chickens. 224 AA broilers with similar body weight and 1-day-old were chosen and divided into 4 groups randomly,which were immune group (NV group),normal immune group (CV group),immunosuppression group (DEX group) and immune hyperthyroidism group (LPS group) with 7 replicates per group and 8 broilers per replicate. At 15,17 and 19 d,chicken of LPS and DEX groups were intramuscular injected with 500 μg/(kg·BW) LPS or 2.5 mg/(kg·BW) DEX,respectively,while chicken of NV and CV groups was injected with normal saline in the same volume. The experiment was lasted for 42 d with 7 d preliminary trial period. The results showed that the average daily feed intake (ADFI) and average daily gain (ADG) were decreased significantly (P<0.05) by LPS and DEX immunological stress,there were was no significant difference in feed to gain ratio (F/G) among experimental groups (P>0.05).The apparent metabolic rate of organic matter (DM) was no significantly affected by LPS and DEX immunological stress,while that of dry matter (OM),crude protein (CP),Ca and P were declined significantly at 36-42 d (P<0.05). At 21 and 42 d,GLU,UA and MDA levels were not significantly different among experimental groups (P>0.05).At 21 d,the contents of serum IL-6 and TNF-α in DEX and LPS groups were significantly higher than those in NV and CV groups (P<0.05),but there was no significant difference at 42 d (P>0.05).The wall thickness,mucosa thickness, villus height and the ratio of villus length to crypt depth were reduced by LPS and DEX at 21 and 42 d of broilers. In summary,LPS and DEX had an important influence on the apparent digestibility of DM,CP,Ca and P.DEX and LPS could damage the intestinal morphology of broilers,reduce the apparent metabolic rate,affect the feed intake and body weight,decrease growth performance. 相似文献
20.
《The Journal of Applied Poultry Research》2007,16(2):226-233
The purpose of this experiment was to investigate the factors affecting water intake in modern genetic lines of broilers that might contribute to problems of wet litter. A total of 128 Ross 308 one-day-old chicks (equal numbers of males and females) were fed commercial grower and finisher rations ad libitum from 10 to 39 d of age, containing 0.2% Ti2 O3 as an inert marker. Birds were housed in groups of 4 in metabolism cages. Body weight and feed consumption were recorded weekly from d 10, and water intake was recorded daily. Excreta from each cage were collected daily and, at the end of each week, the DM content of a sample of pooled excreta from each cage was measured. The results showed that male broilers consumed more water (P < 0.001) and produced excreta that had a lower mean DM content (P < 0.05) compared with females. Males grew significantly faster (P < 0.05) compared with females. There was a significant correlation between feed intake, and hence the intake of N and the major minerals, and water intake (r = 0.623, P = 0.001). Despite a higher apparent retention of DM, CP, and feed efficiency in favor of males, variation among cages was high, and differences between gender were not statistically significant. Water intake tended to be correlated to mean live weight gain of the cage (r = 0.301, P = 0.06), and when live weight gain was used as a covariate in the analysis, the gender difference in water intake was no longer significant. In conclusion, it appears that the higher water intake and lower excreta DM content for males is related to their higher feed and water intake. Mineral excretion was similar for males and females; however, males retained significantly more P compared with females. Male broilers had greater tibia bone size and strength parameters, which indicate higher bone mineral deposition compared with females. 相似文献