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1.
本研究旨在探讨饲粮粗蛋白质水平和氨基酸平衡性对肥育猪生长性能、胴体性状和肉品质的影响。选取平均初始体重为(69.3±3.6)kg的杜×长×大去势公猪125头,随机分为5个组,每组5个重复,每个重复5头猪。5个组分别为:高蛋白质饲粮组(粗蛋白质水平约为14%)、低蛋白质(粗蛋白质水平约为10%)-氨基酸平衡饲粮组以及3个低蛋白质(粗蛋白质水平约为10%)-氨基酸不平衡饲粮组(在低蛋白质-氨基酸平衡饲粮组的基础上分别将含硫氨基酸、苏氨酸和色氨酸与赖氨酸的比例降低10%)。所有饲粮的标准回肠可消化赖氨酸水平均设置为0.71%,低蛋白质-氨基酸平衡饲粮组中标准回肠可消化苏氨酸、标准回肠可消化含硫氨基酸和标准回肠可消化色氨酸与标准回肠可消化赖氨酸的比值分别为0.67、0.60和0.20。试验期为28 d。结果显示:与低蛋白质-氨基酸平衡饲粮组相比,高蛋白质饲粮组肥育猪的平均日采食量有下降趋势(P=0.05),低蛋白质-低色氨酸饲粮组肥育猪平均日增重和平均日采食量均显著下降(P0.05),低蛋白质-低苏氨酸饲粮组和低蛋白质-低含硫氨基酸饲粮组肥育猪的生长性能无显著差异(P0.05)。饲粮粗蛋白质水平和氨基酸平衡性对肥育猪的胴体性状和肉品质无显著影响(P0.05)。因此,低蛋白质-氨基酸平衡饲粮不影响育肥猪生长性能、胴体性状和肉品质,分别降低10%标准回肠可消化含硫氨基酸、标准回肠可消化色氨酸和标准回肠可消化苏氨酸对肥育猪胴体性状和肉品质无显著影响,但降低10%标准回肠可消化色氨酸显著降低肥育猪平均日增重和平均日采食量。 相似文献
2.
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
3.
木聚糖酶对肉仔鸡养分利用和消化器官发育的影响 总被引：2，自引：1，他引：1
本试验研究了小麦型饲粮中添加木聚糖酶对肉仔鸡养分利用及消化器官发育的影响.将240只1日龄爱拔益加肉仔鸡随机分为4个处理,每个处理5个重复,每个重复12只鸡,分别饲喂在含40%小麦的饲粮中添加不同水平木聚糖酶(0、500、1 000和5 000 U/kg)的试验饲粮.试验期21 d.结果表明,木聚糖酶对17～21日龄肉仔鸡粗蛋白质、钙及总磷利用率及粪便含水率无显著影响(P>0.05);趋于提高17～21日龄肉仔鸡干物质利用率(P=0.093)及表观代谢能值(P=0.110);各组肉仔鸡养分表观利用率无显著差异(P>0.05).添加木聚糖酶未显著影响21日龄肉仔鸡小肠、胃、胰腺和脾脏相对重量(P>0.05).1 000 U/kg酶组显著降低了21日龄肉仔鸡回肠相对长度(P<0.05).木聚糖酶对21日龄肉仔鸡胫骨干重、长度、灰分及磷含量无显著影响(P>0.05).本研究表明:含40%小麦的肉仔鸡饲粮中添加不同水平的木聚糖酶对肉仔鸡养分利用及大部分肠道器官发育均未产生显著作用;超量添加对肉仔鸡养分利用无进一步改善作用,也未产生负面影响. 相似文献
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5.
本试验旨在研究饲粮钙和维生素D3水平对肉仔鸡生长性能、屠宰性能和肉品质的影响.试验采用2×2完全随机设计,选用21日龄爱拔益加肉仔鸡240只,随机分成4个处理,每个处理6个重复,每个重复10只鸡.饲养时间为28 d.试验以玉米-豆粕型饲粮为基础饲粮,共设2个钙水平(0.90%和1.15%)和2个维生素D3水平(750和5 000 IU/kg),组成4种试验饲粮.结果表明:1)饲喂含有1.15%钙和5 000 IU/kg维生素D3的饲粮21 d对生长性能影响不显著(P>0.05),饲喂28 d对生长性能影响显著(P<0.05);2)1.15%的钙对腹脂率影响显著(P<0.05);3)1.15%的钙对肌肉剪切力影响极显著(P<0.01),5 000 IU/kg维生素D3对肌肉剪切力影响不显著(P>0.05),钙和维生素D3的互作效应对肌肉剪切力影响显著(P<0.05).以上研究结果表明,长期饲喂含有1.15%钙和5 000 IU/kg维生素D3的饲粮将会降低肉仔鸡生长性能;1.15%的钙能降低肉仔鸡的腹脂率,减小肌肉剪切力,从而提高肉品质. 相似文献
6.
早期数量限饲对肉仔鸡生长性能和胴体特性的影响 总被引：1，自引：0，他引：1
试验研究了早期数量限饲对肉仔鸡生长性能和胴体品质的影响。200只8日龄艾维茵肉仔鸡被随机分成4组,每组五个重复,每重复10只鸡。对照组基础饲粮根据NRC营养水平配制,试验组肉仔鸡从8日龄开始喂料量分别为对照组的90%、80%和70%,限饲1周后各组恢复自由采食。试验结果表明:在第2周,限饲各组肉仔鸡的体重和日增重分别显著低于对照组(P<0.05);在第3周,限饲90%组完成补偿生长,体重与对照组差异不显著(P>0.05);在第4周,限饲80%和70%组完成补偿生长,体重与对照组差异不显著(P>0.05);5、6、7周及2～7周各组在体重、日增重、日采食量和饲料转化率等方面都无显著差异(P>0.05)。早期数量限饲对肉仔鸡胴体特性没有显著影响(P>0.05)。 相似文献
7.
本试验旨在研究在低粗蛋白质(CP)饲粮中添加甘氨酸(Gly)对肉仔鸡生长性能、胴体组成和血液生化指标的影响。选用180只1日龄健康爱拔益加(AA)肉仔鸡(公雏),随机分为3组,每组6个重复,每个重复10只。3组分别为:正对照(PC)组,前期和后期饲粮CP水平分别为22.0%和20.0%;负对照组,前期和后期饲粮CP水平分别为18.0%和15.5%;Gly组,在负对照组基础上添加Gly,使饲粮Gly和丝氨酸水平为2.32%。试验期42 d,分为前期(1~21 d)和后期(22~42 d)2个阶段。结果表明:1)饲粮CP水平降低4.0~4.5个百分点,试验1~21 d的料重比(F/G)显著升高(P0.05),22~42 d的平均日增重(ADG)显著降低(P0.05);添加Gly后,1~21 d F/G显著降低(P0.05),22~42 d ADG显著升高(P0.05),达到了与PC组相似的生长性能。2)CP水平降低,肉仔鸡42日龄胸肌率降低了9.5%(P0.05)、腹脂率提高了60.3%(P0.05);添加Gly后,胸肌率提高了17.6%(P0.05),腹脂率降低了34.6%(P0.05),获得了与PC组相似的胴体组成。CP水平降低、添加Gly均未显著影响屠宰率、全净膛率和腿肌率(P0.05)。3)各组间血液生化指标均无显著差异(P0.05)。可见,低CP饲粮中添加Gly可以改善生长性能和胴体组成,结果提示了Gly在肉仔鸡低CP饲粮中的可应用性。 相似文献
8.
《广东饲料》2017,(6)
蛋氨酸、赖氨酸和苏氨酸分别是影响肉鸡肌肉生长的第1-3必需氨基酸。为探讨蛋氨酸、赖氨酸和苏氨酸对肉鸡肌肉生长的潜在影响,本试验采用三因素旋转中心组合设计,研究饲粮可消化蛋氨酸、赖氨酸和苏氨酸的互作关系并通过响应面分析的方法来确定获得最佳肉仔鸡胸肌和腿肌产量的适宜饲粮可消化蛋氨酸、赖氨酸和苏氨酸比例。试验选择360只3日龄肉鸡,分为15个处理组,除第9组含18个重复以外其余每个处理组设3个重复,每个重复6只。饲粮可消化蛋氨酸(0.416%~0.584%)、赖氨酸(0.881%~1.319%)和苏氨酸(0.532%~0.868%)分别设5个水平。试验期为3-16日龄。研究发现,饲粮可消化必需氨基酸显著影响肉仔鸡胸肌和腿肌产量(P0.05),可消化赖氨酸对其胸肌产量的影响是可消化苏氨酸的3倍,可消化蛋氨酸和赖氨酸对肉雏鸡胸肌产量存在显著的交互作用(P0.05)。在腿肌产量方面,可消化苏氨酸的效应显著高于可消化蛋氨酸和赖氨酸(P0.05),可消化苏氨酸和蛋氨酸之间存在最显著的交互作用(P0.05)。采用最小二乘法回归获得肉仔鸡胸肌和腿肌的二阶模型。Canonical分析表明,胴体组成的驻点是一个鞍点,因此采用岭脊分析可分别获得每个最佳的可消化必需氨基酸水平。肉仔鸡胸肌和腿肌的岭脊分析发现,饲粮可消化蛋氨酸、赖氨酸和苏氨酸水平分别为0.58%、1.05%和0.76%获得最大胸肌产量,其可消化蛋氨酸、苏氨酸和可消化赖氨酸的理想氨基酸比例分别为55%和72%;饲粮可消化蛋氨酸、赖氨酸和苏氨酸水平分别为0.58%、1.09%和0.70%获得最大腿肌产量,其可消化蛋氨酸、苏氨酸和可消化赖氨酸的理想氨基酸比例分别为53%和64%。敏感性分析发现,饲粮赖氨酸和苏氨酸分别对肉仔鸡胸肌和腿肌的二阶模型最为重要。总之,提供饲粮可消化蛋氨酸、赖氨酸和苏氨酸水平分别为0.58%、1.05%和0.76%可获得最佳的肉仔鸡胸肌产量并保证了最佳的腿肌产量,其较高的可消化蛋氨酸和苏氨酸理想氨基酸比例表明蛋氨酸和苏氨酸对胸肌的生长比腿肌更为重要。 相似文献
9.
试验研究日粮中禽脂水平(30和24 g/kg)以及是否添加外源乳化剂溶血卵磷脂(LPC)对肉仔鸡生长性能、脂肪酸表观消化率以及日粮表观代谢能(AME)的影响.本试验选用168只1日龄AA肉仔鸡(公雏),按照2×2因子设计,分4个处理,每个处理7个重复,每个重复6只鸡.试验中测定生长性能、营养物质表观消化率以及日粮AME.结果表明,禽脂添加水平对肉仔鸡生长性能、脂肪酸表观消化率以及日粮AME没有显著影响(P>0.05).日粮中添加LPC提高肉仔鸡体增重(P<0.05)、降低料重比(P<0.05)、提高14～17日龄日粮AME(P<0.05).添加LPC有提高14～17日龄肉仔鸡粗脂肪表观消化率的趋势(P=0.086).日粮中添加外源乳化剂LPC提高了C18:0脂肪酸的表观消化率(P<0.05),对其他脂肪酸、粗蛋白质以及粗脂肪表观消化率没有显著影响(P>0.05).这些结果表明,在含禽脂的日粮中添加500 mg/kg LPC能改善肉仔鸡生长性能;LPC改善肉仔鸡生长性能的作用是通过提高脂肪表观消化率实现的. 相似文献
10.
低蛋白质平衡氨基酸饲粮对生长猪生长性能、胴体品质及肠道健康的影响 总被引：1，自引：0，他引：1
本文旨在研究低蛋白质平衡氨基酸饲粮对生长猪生长性能、胴体品质、肌肉品质和肠道健康的影响。试验采用单因素完全随机设计,选择初始体重为(17.02±1.40)kg的健康"杜×长×大"三元杂交去势公猪16头,随机分为正常蛋白质组(饲粮粗蛋白质水平为18%,标准回肠可消化赖氨酸含量为0.93%)和低蛋白质组(饲粮粗蛋白质水平为14%,标准回肠可消化赖氨酸含量为1.03%)2个组,每组8个重复,每个重复1头猪。试验期共39 d。在试验结束当天对生长猪进行称重、结料和采血,并屠宰所有生长猪用于测定胴体品质、肌肉品质、肠道形态及消化酶活性。结果表明:与正常蛋白质饲粮相比,低蛋白质平衡氨基酸饲粮显著提高了生长猪背最长肌的亮度值(P<0.01)和黄度值(P<0.05);对小肠各肠段的绒毛形态无显著影响(P>0.05),但有提高空肠绒毛高度和隐窝深度比值的趋势(P=0.09);对生长猪的生长性能、胴体品质和肌肉品质无显著影响(P>0.05)。本试验结果表明,与正常蛋白质饲粮相比,标准回肠可消化赖氨酸含量为1.03%的低蛋白质平衡氨基酸饲粮能够维持生长猪正常生长性能,并有改善肠道健康状况的趋势。 相似文献
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《The Journal of Applied Poultry Research》2017,26(4):558-572
Glycine has been reported to be conditionally essential for broilers fed reduced crude protein diets during the starter period. Research evaluating dietary Gly responses subsequent to the starter period is sparse. This experiment was conducted to ascertain the effects of feeding reduced crude protein diets supplemented with Gly and/or L-Gln (nitrogen source) on growth performance and carcass characteristics of broilers during a 41-day production period. Eight dietary treatments were utilized with the negative control diets formulated to contain approximately 2.4 and 0.29% points lower crude protein and total Gly + Ser concentrations, respectively, than the positive control diets. The 6 other diets were formulated to contain intermediate concentrations of total Gly + Ser and/or crude protein (nitrogen) by adding Gly and/or L-Gln, respectively, to the negative control diets. Glycine appeared to have more pronounced effects than nitrogen contribution on feed conversion ratio and body weight gain of broilers during starter and grower periods, whereas Gln improved feed conversion of broilers in the finisher period. Total breast meat weight and yield of broilers provided diets with the additions of Gly and L-Gln were higher than those receiving diets with only Gly or L-Gln supplementation. The positive outcomes on growth performance and carcass characteristics suggested that providing adequate total Gly + Ser and nitrogen concentrations in diet formulation may be necessary for broilers when dietary CP content was reduced approximately by 2.4% points during a 6-week production period. 相似文献
12.
《The Journal of Applied Poultry Research》2014,23(2):188-195
The objective of the current study was to evaluate the effect of feeding a thermo-tolerant xylanase in low-energy broiler diets on performance and processing parameters. Evaluation criteria included average broiler BW, FCR, livability, carcass yield, and fat pad yields. The experimental design consisted of 3 nutrient profiles: positive control, negative control 1 (−66 kcal/kg), and negative control 2 (−132 kcal/kg). Two xylanase inclusion programs were included in the negative control 1 and 2 diets; 60 g/t was included in the starter and grower diets with either 60 or 100 g/t in the finisher and withdrawal diets, yielding a total of 7 treatment groups with 8 replicate pens per treatment each containing 42-d-old straight-run chicks per treatment (2,352 total broilers). Broilers were reared in floor pens through 45 d of age. The dietary program consisted of 5 dietary phases: starter (1–15 d), grower 1 (16–23 d), grower 2 (24–31 d), finisher (32–38 d), and withdrawal (39–45 d). Body weights and feed consumption were determined on days of dietary changes, including d 15, 23, 31, 38, and 45. On d 45, 4 male and 4 female broilers per replicate (448 total) were subjected to an 8-h feed withdrawal period and processed to obtain carcass and fat pad weights. Reducing the dietary energy level increased FCR and decreased the fat pad weight of broilers in the negative control 2 treatment compared with the positive control. Inclusion of xylanase during the starter phase increased d 15 BW and reduced FCR. The inclusion of xylanase continued to reduce FCR throughout the trial, as compared with diets without xylanase inclusion. Within this study, we have demonstrated the effectiveness of xylanase inclusion in reduced-energy diets (−66 and −132 kcal/kg) to improve FCR of broilers to that of broilers fed energy-adequate diets. 相似文献
13.
《The Journal of Applied Poultry Research》2005,14(2):195-203
The objective of this study was to evaluate diet formulation based on digestible amino acids (DAA), the formulation of low protein diets supplemented with synthetic amino acids, and L-Thr supplementation to increase the Thr:Lys ratio from 67:100 to 70:100. Two experiments were carried out with Hubbard male broilers from 3 to 6 wk of age. In experiment 1, corn-soybean meal diets containing 20% CP were used. In experiment 2, 20% CP diets were formulated with corn, soybean meal, wheat bran, feather meal, and meat meal. In both experiments, body weight gain and economic evaluations were better for broilers fed diets formulated on DAA. Carcass yields and carcass composition were not significantly affected by formulation procedures. In experiment 2, birds fed diets based on DAA had improved feed efficiency compared with those fed total amino acids (TAA). In experiment 1, a reduction of CP from 20 to 18.2% did not affect broiler performance. It did, however, result in fatter carcasses, lower percentages of breast meat, and lower economic evaluation. In both experiments, performance and economic evaluation were not affected by the Thr:Lys ratio. In experiment 1, however, abdominal fat and carcass fatness were reduced, and, in both experiments, carcass protein level was higher with a Thr:Lys ratio of 70:100 than with 67:100 ratio (P < 0.05). 相似文献
14.
选择胎次、预产期、体重相近的妊娠母猪24头,采用单因子试验设计,随机分为3个处理,每个处理设8个重复。对照组饲喂常规饲料,粗蛋白质（CP）水平为14.5%,试验组Ⅰ和Ⅱ为低CP补充氨基酸日粮,其CP水平分别为12.5%和10.5%。各处理氨基酸水平相同。试验期为从配种后20 d左右确定受孕后开始,直到产仔结束。试验结果表明：①与对照组相比,妊娠母猪采食低CP日粮,对其繁殖性能如总产仔数、活仔数、初生重及背膘厚无显著影响（P>0.05）。②对照组血清尿素氮的含量与试验组Ⅰ差异不显著（P>0.05）,而显著高于试验组Ⅱ（P<0.05）。试验组Ⅰ的血清尿素氮的含量与试验组Ⅱ差异显著（P<0.05）。血糖含量随CP水平的降低有下降的趋势,对照组血糖含量与试验组Ⅰ差异不显著（P>0.05）,而与试验组Ⅱ差异显著（P<0.05）;试验组Ⅰ和Ⅱ血糖含量差异不显著（P>0.05）。③饲料CP的表观消化率随着CP的降低有上升的趋势,试验组Ⅰ与对照组相比差异不显著（P>0.05）,而试验组Ⅱ显著高于试验组Ⅰ和对照组（P<0.05）。综上所述,妊娠母猪采食低CP补充氨基酸日粮,对其繁殖性能及背膘厚无显著影响。 相似文献
15.
《The Journal of Applied Poultry Research》2014,23(2):252-259
An experiment was conducted to evaluate increasing or decreasing concentrations of dietary phytase on growth performance and processing yields of male broilers from 1 to 35 d of age. Treatments consisted of a positive control, a negative control (NC; less 0.14% Ca, 0.13% nonphytate P, and 0.03% Na), and 6 additional treatments based on the NC supplemented with phytase. Treatments 3 through 5 consisted of the NC diet supplemented with 500 phytase units (FTU)/kg of phytase in the starter phase that was either continued throughout the remainder of the study (treatment 3) or increased to 1,500 FTU/kg beginning in the finisher (treatment 4) or grower (treatment 5) phases. Treatment 6 had 1,500 FTU/kg of phytase throughout the study. Treatments 7 and 8 had 1,500 FTU/kg in the starter and decreased to 500 FTU/kg in the finisher or grower phases, respectively. At 35 d of age, broilers fed diets containing 1,500 FTU/kg of phytase had increased BW gain compared with birds fed diets formulated to contain 500 FTU/kg of phytase. Increasing phytase concentration between the starter and grower phases or decreasing phytase concentration between the grower and finisher phases negatively affected FCR from 1 to 35 d of age. Phytase supplementation did not affect weight and yield of carcass characteristics. Therefore, dietary phytase concentration should not be varied throughout production for optimum growth performance. 相似文献
16.
H R Kutlu 《Archives of Animal Nutrition》2001,54(2):127-139
In two experiments was investigated whether feeding with an air-dry feed mixed with different amounts of water and/or supplemental ascorbic acid affect performance and carcass compositions of broilers exposed to a high ambient temperature (35 to 37 degrees C for 8 h/d and thermoneutral for 16 h/d). In the first trial, 64 one-week-old male broiler chicks were fed ad libitum in four dietary treatment groups for a 6-week period. Experimental mash diets were prepared by mixing a maize-soybean based standard broiler starter or finisher with tap water in the ratios of 0.0:1.0, 0.5:1.0, 1.0:1.0 and 1.5:1.0 (water:air-dry feed, w/w). More water in the diet increased BWG, DMI, abdominal fat and carcass weight, carcass CP, crude fat, but it deteriorated DM conversion efficiency. In the second experiment, 64 one-week-old male broiler chicks were given air-dry or wet (water:feed, 1.5:1) starter or finisher diets without or with ascorbic acid supplementation (0 and 250 mg/kg air-dry feed, resp.) ad libitum for a 6-week period. Ascorbic acid supplementation increased BWG, carcass weight and carcass CP significantly, while reducing carcass crude fat content. However, feeding broilers with a diet mixed with water in a ratio of 1.5:1.0 increased BWG, DMI, carcass weight and carcass lipid markedly, but deteriorated DM conversion efficiency. There was also a significant interaction between ascorbic acid and wet feeding, whereby ascorbic acid supplementation induced a significant reduction in carcass lipid contents of broilers fed on air-dry diets but not on wet diets. It is concluded that wet feeding, especially an addition of 150% water to produce a porridge like consistency, improved growth performance by increasing fat, ash and protein deposition in the body, while reducing DM conversion efficiency. It is also concluded that under heat stress supplemental ascorbic acid in air-dry diets stimulates broiler performance but not in wet diets. 相似文献
17.
《The Journal of Applied Poultry Research》2006,15(3):383-393
Providing broilers diets formulated to a high amino acid density early in life improves subsequent growth performance and meat yield. Diets formulated to high amino acid concentrations beyond 5 wk of age may increase breast meat yield but may not be economically justified. This study examined growth, meat yield, and economic responses of broilers provided diets varying in amino acid density from 36 to 59 d of age. Birds were given a 4-phase feeding program: starter (1 to 17 d), grower (18 to 35 d), withdrawal-1 (WD1; 36 to 47 d), and withdrawal-2 (WD2; 48 to 59 d of age). All birds were fed a common, high amino acid density diet to 35 d of age (HH). Broilers were provided diets characterized as being high (H), moderate (M), or low (L) in amino acid density for the WD1 and WD2 periods. Dietary treatments were HHHH, HHHM, HHHL, HHMM, HHML, and HHLL from d 1 to 59, with H, M, and L representing the diets fed during each of the 4 periods (starter, grower, WD1 and WD2).Cumulative feed conversion was improved when the HHHH feeding regimen was fed, whereas other final live performance measurements were not affected. Decreasing amino acid density (HHLL and HHHL) limited yields of breast fillets, tenders, and total white meat when compared with the HHHH regimen. As amino acid density decreased from HHHH to HHHM, HHMM, and HHML, carcass yield and breast meat yield were not affected. In general, providing the HHHH feeding regimen increased economic gross feeding margin compared with the other dietary treatments. 相似文献
18.
本试验旨在研究日粮中添加不同比例的复合型植物提取物对三黄鸡肉品质的影响。试验选用1日龄,健康、初始体重为29.21 g的三黄鸡公鸡240只,随机分4组,每组10个重复,每个重复6只鸡。A组饲喂基础日粮,B、C、D组在基础日粮中分别添加0.01%、0.02%、0.04%的植物提取物。饲养至70日龄时进行屠宰试验,分别取胸肌、腿肌,测定物理指标、化学指标、氨基酸含量、脂肪酸含量。结果表明:与对照组相比,饲料中添加0.02%的植物提取物能够提高肌肉pH、粗蛋白比例(P0.05),降低肌肉脂肪(P0.05),但对肌肉剪切力无显著差异(P0.05);增加肌肉中苏氨酸、谷氨酸、甘氨酸、亮氨酸、必需氨基酸、呈味氨基酸、总氨基酸含量(P0.05);提高腿肌中饱和脂肪酸、不饱和脂肪酸、必需脂肪酸含量(P0.05)。综合分析,在饲料中添加0.02%的植物提取物能显著改善肌肉风味,提高肌肉品质。 相似文献
19.
本试验研究肉仔鸡生长早期 (2～ 3周龄 )不同代谢能、蛋白质限饲水平对生产性能和胴体品质影响。结果表明 :(1 )早期低代谢能和低蛋白的限饲处理均可明显降低肉仔鸡生长速度 (P <0 .0 5) ,并在恢复阶段表现出完全补偿生长。 (2 )早期不同代谢能、蛋白限饲水平对饲料转化率没有影响 (P >0 .0 5)。 (3)早期不同代谢能、蛋白限饲水平均有提高胴体产量、胸肉和腿肉比例的趋势 (P >0 .0 5)。 (4)早期低代谢能限饲明显降低 42日龄腹脂重 (P <0 .0 5) ,低蛋白质限饲增加腹脂重 (P >0 .0 5)。 相似文献