共查询到19条相似文献，搜索用时 578 毫秒
1.
不同植酸酶对饲喂低磷日粮肉鸡生长性能及粪N、P排泄的影响 总被引：1，自引：0，他引：1
采用306只艾维茵肉鸡研究低磷日粮中添加两种不同植酸酶对肉鸡生产性能、养分利用率及氮、磷排泄的影响。试验共分3个处理组,即对照组、试验Ⅰ组和试验Ⅱ组,每个处理组3个重复,每个重复34只鸡。对照组饲喂正常磷水平的日粮;试验Ⅰ组饲喂低磷＋植酸酶Ⅰ的日粮;试验Ⅱ组饲喂低磷＋植酸酶Ⅱ的日粮。试验结果表明,添加植酸酶替代日粮中部分无机磷,肉鸡的日增重和日采食量与对照组相比降低,但差异不显著（P＞0.05）;提高了肉鸡的存活率（P＜0.05）和钙、磷利用率（P＜0.05）;同时氮利用率有一定程度改善（P＞0.05）,显著减少了氮、磷的排泄量（P＜0.05）。添加植酸酶Ⅰ与添加植酸酶Ⅱ相比,肉鸡的日增重与日采食量提高（P＜0.05）,氮的排泄量显著降低（P＜0.05）,磷的排泄量没有差异。 相似文献
2.
试验旨在研究低钙磷饲粮添加高剂量植酸酶对1～63日龄黄羽肉鸡生长性能及胫骨性能的影响。选用1 080只1日龄岭南黄羽肉公雏,根据体重一致原则分为6个处理,每个处理6个重复,每个重复30只。试验期63 d。结果表明:①植酸酶的添加可显著提高体重、平均日增重(P<0.05);②添加植酸酶显著提高了胫骨骨密度(P<0.05);MP+4 000、LP+4 000组胫骨脱水脱脂重显著提高(P<0.05);MP+4 000组胫骨灰分含量、磷含量显著提高(P<0.05);植酸酶的添加对胫骨钙含量无显著影响(P>0.05)。综上所述,低钙磷饲粮添加高剂量植酸酶可提高1～63日龄黄羽肉鸡生长性能,改善胫骨性能。可考虑用4 000 FTU/kg植酸酶部分替代或者完全替代玉米-豆粕型饲粮中磷酸氢钙。 相似文献
3.
本文旨在研究小麦型日粮中添加木聚糖酶和植酸酶对肉鸡生长性能、回肠氨基酸表观消化率及矿物元素沉积的影响。试验选择1日龄科宝白羽肉仔鸡850只,随机分成5组,每组5个重复,每个重复34只鸡。一共有5种日粮,即低磷日粮、高磷日粮、低磷日粮+2000 IU/kg木聚糖酶、低磷日粮+500 FTU/kg植酸酶,低磷日粮+2000 IU/kg木聚糖酶+500 FTU/kg植酸酶,试验进行21 d。低磷组较高磷组显著降低了肉鸡的日增重、日采食量及趾骨灰分含量(P <0.05),与低磷组相比,木聚糖酶组显著降低了肉鸡的料比(P <0.05),而植酸酶组显著提高了肉鸡日增重、日采食量、趾骨灰分及饲料利用率(P <0.05)。复合酶组显著提高了15种氨基酸回肠表观消化率(P <0.05)。与低磷组相比,木聚糖酶组显著提高了表观消化能和可消化代谢能及回肠氮消化率(P <0.05),而植酸酶显著提高了氮沉积及回肠氮消化率(P <0.05),复合酶组显著提高了代谢能、可消化代谢能及氮沉积量(P <0.05)。植酸酶和复合酶组较高磷组显著提高了磷表观消化率和沉积量(P <0.05),但低磷组较高磷组显著提高了钙的表观消化率(P <0.05),植酸酶酶和复合酶组较其他3组显著提高了钾的沉积量(P <0.05)。结论 :小麦型日粮同时添加植酸酶和木聚糖酶对肉鸡生长和消化的影响要优于单独添加这两种酶。 相似文献
4.
《水禽世界》2021,(3)
本试验旨在研究饲粮中添加不同水平植酸酶对1～21日龄麒麟鸡生长性能、体尺性状及胫骨特性的影响,评价植酸酶的应用效果并确定该阶段植酸酶的适宜水平。选取180只健康、体型相近的1日龄麒麟鸡,随机分成3个处理组,每个处理组6个重复,每个重复10只鸡。试验采用玉米-豆粕型基础饲粮,非植酸磷水平为0.33%,3个处理组植酸酶水平分别为0、600、1200 U/kg,试验持续21 d。结果表明:(1)饲粮中添加植酸酶对料肉增重比有显著影响(P0.05),对平均日增重、平均日采食量、成活率无显著影响(P0.05);(2)体尺性状各组间差异不显著(P0.05);(3)胫骨抗压强度各组间有显著差异(P0.05),添加1200 U/kg植酸酶处理组的胫骨抗压强度显著高于其他2个处理组,饲粮中不同含量植酸酶对胫骨脱脂烘干质量有提高的趋势(P=0.0771),但对胫骨其他参数指标无显著影响(P0.05)。综上所述,饲粮中添加0～1200 U/kg植酸酶对麒麟鸡平均日增重、平均日采食量、成活率、体尺性状、胫骨长度、胫骨灰分含量、胫骨灰分磷含量、胫骨灰分钙含量、胫骨灰分钙磷比无显著影响,但对料肉增重比、胫骨抗压强度的影响差异显著,对胫骨脱脂烘干质量有提高趋势。麒麟鸡的低磷饲粮中,其植酸酶的适宜添加水平为1200 U/kg。 相似文献
5.
选用健康无残、体重无差异的艾维茵肉鸡（18 d）96只,随机分为3个处理组,每个处理4个重复,每个重复8只。分为对照组（基础日粮1）、处理1组（基础日粮2+200 g/kg 植酸酶）、处理2组（基础日粮3+200 g/kg 植酸酶+200 g/kg 蛋白酶）,有效磷水平分别设定为0.35%、0.30%、0.25%,粗蛋白水平分别设定为18%、16.5%、16.5%。研究了添加植酸酶和蛋白酶对肉鸡生长性能、胫骨性能、血液生化指标以及氮、磷排泄的影响。结果表明：与单一添加植酸酶相比,植酸酶和蛋白酶有较好的协同作用,日粮蛋白水平可以降低1.5个质量百分含量,可替代60%的磷酸氢钙,氮、磷的排放分别下降了45.68%、44.79%。 相似文献
6.
文章旨在评估不同蛋白质水平日粮补充植酸酶对猪生长性能、养分消化及气体排放的影响。试验将600头平均体重为22.56 kg的商品仔猪随机分为4组,每组5个重复,每个重复32头。试验日粮采用2×2因子设计,即2种粗蛋白质水平（15.0%和18.0%）以及2个植酸酶添加水平（0和200 mg/kg）,试验为期3周。结果：高蛋白质日粮组猪的平均日增重和饲料效率显著高于低蛋白组（P＜0.05）,而日粮添加200 mg/kg植酸酶显著改善了饲料效率（P＜0.05）。日粮蛋白质水平和植酸酶水平对末重、平均日增重、采食量、料重比和死亡率的影响无显著交互效应（P＞0.05）。无论日粮蛋白质水平如何,日粮添加200 mg/kg植酸酶显著改善了磷表观消化率（P＜0.05）,同时显著降低甲烷、氮和硫化氢排放量（P＜0.05）。结论：在本研究条件下,高蛋白质日粮可以提高猪的日增重和饲料效率,补充200 mg/kg植酸酶可以改善磷表观消化率,降低有害气体排放。
[关键词]粗蛋白质|植酸酶|猪|生长性能|养分消化|气体 相似文献
7.
植酸酶对肉鸡生长性能、血液生化指标的影响 总被引：2，自引：0，他引：2
采用306只艾维茵肉鸡研究低磷日粮中添加两种不同植酸酶对肉鸡生长性能、血液生化指标、胫骨质量以及屠宰性能的影响。试验共分3个处理组,即对照组、试验Ⅰ组和试验Ⅱ组,每个处理组3个重复,每个重复34只鸡。对照组饲喂正常磷水平的日粮;试验Ⅰ组饲喂低磷+植酸酶Ⅰ的日粮;试验Ⅱ组饲喂低磷+植酸酶Ⅱ的日粮,试验结果表明:添加植酸酶Ⅰ对日增重、采食量以及料肉比无显著差异,但提高了肉鸡的存活率(P<0.05);添加植酸酶Ⅱ,在1～21、1～49d阶段,日增重、采食量显著降低(P<0.05),但料肉比无显著差异,存活率显著提高(P<0.05)。植酸酶替代日粮中部分磷酸氢钙后,显著降低了血清中尿素氮浓度,对血清中钙、磷浓度以及碱性磷酸酶活性无显著性影响;对肉鸡胫骨质量无显著性影响;对肉鸡屠宰率、全净膛率、半净膛率也无显著性影响,但显著降低了肉鸡的腹脂率(P<0.05),显著提高了其胸肌率(P<0.05)。 相似文献
8.
试验旨在研究低磷饲粮中添加植酸酶对肉鸭生长性能、屠宰性能和血液生化指标的影响。采用单因子完全随机试验设计,将400只1日龄雄性Z型北京鸭随机分为4组,每组10个重复,每个重复10只鸭。对照组饲喂低磷饲粮,无机磷组在低磷饲粮中添加0.2%无机磷,植酸酶组在低磷饲粮中分别添加1 000、2 000 U/kg植酸酶,试验期42 d。结果表明：无机磷组和2 000 U/kg植酸酶组肉鸭各阶段体重、日增重和日采食量高于对照组（P<0.05）,而无机磷组和2 000 U/kg植酸酶组间无显著差异;无机磷组和2 000 U/kg植酸酶组肉鸭胸肌率和腹脂率高于对照组（P<0.05）,腿肌率低于对照组（P<0.05）;无机磷组和植酸酶组（1 000、2 000 U/kg）肉鸭血清磷水平高于对照组（P<0.05）,血清碱性磷酸酶含量低于对照组（P<0.05）,无机磷组和植酸酶组无显著差异;1 000、2 000 U/kg植酸酶组肉鸭血清总胆红素高于对照组和无机磷组（P<0.05）。由此可见,低磷饲粮中添加植酸酶能有效改善肉鸭生长性能和屠宰性能,提高血清磷含量,降低血清碱... 相似文献
9.
植酸酶和木聚糖酶对断奶仔猪生长性能及蛋白质利用率的影响 总被引：1，自引：0，他引：1
本试验研究了在饲粮中添加植酸酶和木聚糖酶对断奶仔猪生长性能及蛋白质利用率的影响。采用完全随机设计．将90头35日龄的断奶仔猪分为5组．每组3个重复．每个重复6头。5个处理组分别为：（1）玉米-豆粕基础日粮（正对照组．PC），（2）基础日粮-75％磷酸氢钙（负对照组．NC）．（3）负对照组＋植酸酶（植酸酶组，phy），（4）负对照组＋木聚糖酶（木聚糖酶组，xy），（5）负对照组＋植酸酶＋木聚糖酶（植酸酶-木聚糖酶组，phy—xy）．植酸酶的添加量为750U／kg，木聚糖酶的添加量为4000U／kg。结果表明：低磷饲粮添加植酸酶或木聚糖酶后．平均日增重和平均日采食量都得到了明显改善（P〈0．05）．植酸酶和木聚糖酶同时添加对仔猪平均日增重的改善极显著（P〈0．01）。在低磷口粮组单独添加植酸酶或同时添加植酸酶和木聚糖酶极显著提高了蛋白质生物学价值（P〈0．01）。饲粮加酶后，血清尿素氮浓度显著降低（P〈0．05）．添加植酸酶或同时添加植酸酶和木聚糖酶后．血清总蛋白浓度显著升高（P〈0．05）．但添加酶对蛋白质表观消化率无显著影响．总之．在断奶仔猪低P日粮中添加植酸酶或木聚糖酶都不同程度地改善了仔猪生长性能．促进了蛋白质的利用．二酶同时添加对仔猪的平均日增重有显著的协同效应． 相似文献
10.
植酸酶对生长肥育猪生长性能、营养素利用、胴体和肌肉品质影响的研究 总被引：1，自引：0，他引：1
选用60头平均体重28．3kg的杜长大杂种猪，随机分成2组，每组30头。在生长期（28～58kg）每组分成3圈（重复），每圈10头；在肥育期（58～95kg）每组分成6圈（重复），每圈5头。试验组饲粮中添加植酸酶750FTU／kg（FTU为植酸酶的活性单位），对照组饲粮中不添加植酸酶。生长期和肥育期饲粮钙磷比分别为1．15：1和1．18：1。试验结果显示，（1）饲粮中添加植酸酶使生长期、肥育期和生长肥育全期的平均日增重显著提高（P〈0．05），对平均日采食量和料重比无显著影响（P〉0．05）；（2）添加植酸酶对胴体和肌肉品质的影响不明显（P〉0．05）；（3）添加植酸酶对生长期养分（干物质、有机物、粗蛋白质、粗灰分、钙、磷）的消化率无显著影响（P〉0．05），但显著提高肥育期养分的消化率（P〈0．01）；（4）添加植酸酶未能提高生长期养分的吸收量（P〉0．05），但显著提高肥育期粗灰分（P〈0．01）和磷（P〈0．05）的吸收量；（5）添加植酸酶使生长期粪中铜的含量显著降低（P〈0．05），但对其他养分含量无显著影响（P〉0．05），添加植酸酶对肥育期粪中养分含量无显著影响（P〉0．05）；（6）添加植酸酶对生长期粪中养分的排泄量均无显著影响（P〉0．05），但有减少铜排泄量的趋势（P〉0．05），添加植酸酶使肥育期磷的排泄量显著降低（P〈0．05），并有降低氮和金属微量元素（铜、锌、铁、锰）排泄量的趋势（P〉0．05）。试验结果表明，饲粮中添加植酸酶可促进猪生长肥育期的增重，提高肥育期对养分的消化利用，降低生长期粪中铜的含量，减少肥育期粪中磷的排泄量；添加植酸酶对胴体和肌肉品质无不良影响。 相似文献
11.
不同植酸酶对生长育肥猪生产性能及养分利用的影响 总被引：1，自引：1，他引：0
选择"杜×长×大"三元杂交生长猪54头,研究了大肠杆菌、黑曲霉来源植酸酶替代日粮中部分磷酸氢钙对生长育肥猪生长性能、养分消化率、血液生化指标及粪磷、氮排泄的影响。试验猪随机分成对照组、试验Ⅰ组、试验Ⅱ组,每组3个重复。对照组饲喂常规日粮,试验Ⅰ组饲喂低磷+植酸酶Ⅰ的日粮,试验Ⅱ组饲喂低磷+植酸酶Ⅱ的日粮。试验结果表明,在生长育肥猪日粮中添加植酸酶替代部分磷酸氢钙,改善了生长育肥猪生长性能,其中添加大肠杆菌植酸酶显著改善生长育肥猪的生长性能;显著改善了干物质、粗蛋白质、钙、磷、总能的表观消化率,并显著降低了粪中氮、磷的排泄;显著提高了血清中总蛋白、球蛋白、血清磷的浓度,而尿素氮、血清钙浓度显著降低。添加黑曲霉植酸酶后,血糖浓度下降,而碱性磷酸酶的活性无显著变化;添加大肠杆菌植酸酶后,碱性磷酸酶的活性显著降低,而血糖浓度无显著变化。 相似文献
12.
植酸酶和柠檬酸对肉鸡生产性能及钙、磷利用率的影响 总被引：10，自引：1，他引：9
试验以正常营养水平饲粮为对照 ,研究在低营养水平饲粮中添加植酸酶 (0、 30 0g/t)、柠檬酸 (0、 0 5% )对肉鸡生产性能和钙、磷利用率的影响。试验用 2 2 5羽 1日龄黄羽肉鸡随机分为 5个处理 ,每处理 3个重复 ,每重复 1 5只鸡进行 6周试验。结果饲粮营养水平降低 6 %可导致肉鸡日增重 (ADG)和饲料利用率下降 (P <0 0 5) ;在低营养水平日粮中 ,添加 30 0g/t植酸酶、 0 5 %柠檬酸 ,ADG和料肉比 (F/G)与正常营养水平饲粮组差异不显著 (P >0 0 5) ;各处理组的血清Ca、P、AKP活性及胫骨Ca、P差异不显著 (P >0 0 5) ;腿病发生率各处理组差异不显著 (P >0 0 5)。添加 30 0g/t植酸酶、 0 5 %柠檬酸的处理组P排泄量显著低于对照组 (P <0 0 5)。植酸酶与柠檬酸合用能进一步提高生产性能和钙、磷利用率 ,能达到正常营养水平饲粮的效果。植酸酶与柠檬酸合用存在协同效应 相似文献
13.
Efficacy of yeast phytase in improving phosphorus bioavailability in a corn-soybean meal-based diet for growing pigs 总被引：2，自引：0，他引：2
Matsui T Nakagawa Y Tamura A Watanabe C Fujita K Nakajima T Yano H 《Journal of animal science》2000,78(1):94-99
Crossbred barrows (n = 66; 6 wk old) were used in a 6-wk experiment to evaluate the efficacy of phytase from yeast or Aspergillus niger on performance, tibial characteristics, and serum inorganic P concentration. We also investigated the stability of these phytases in acidic solutions with pepsin, which simulated gastric conditions. Pigs were fed a P-adequate diet containing .34% nonphytate-P or a low-P diet containing .20% nonphytate-P. The low-P diet was supplemented with 0, 1,000, 2,000, or 4,000 phytase units (PU; the activity at optimal pH, i.e., pH 4.2 for yeast phytase and pH 5.5 for phytase from Aspergillus niger)/kg of yeast phytase, or 1,000 PU/kg phytase from Aspergillus niger. The graded level of yeast phytase linearly increased ADG (P = .047), tibial weight (P = .091), tibial density (P < .001), and P concentration in tibial cortex (P = .018). Aspergillus niger phytase also increased ADG (P = .022), serum inorganic P concentration (P < .001), tibial density (P = .007), and tibial P concentration (P = .025). The pigs given 1,000 PU/kg Aspergillus niger phytase showed greater ADG (P = .091), tibial density (P= .001), and tibial P concentration (P = .062) than those given 1,000 PU/kg yeast phytase. No measurements differed (P > .31) between the pigs given 1,000 PU/kg Aspergillus niger phytase and those given 4,000 PU/kg yeast phytase. These results suggested that yeast phytase improves bioavailability of P in the diet for growing pigs but the efficacy of yeast phytase is less than that of Aspergillus niger phytase. During incubation in acidic solutions with pepsin, yeast phytase (P < .001) lost more of its activity than Aspergillus niger phytase. This lesser stability of yeast phytase may be responsible for the poorer efficacy of yeast phytase than that of Aspergillus niger. In summary, supplementation of swine diets with yeast phytase is beneficial, but its efficacy is less than that of Aspergillus niger phytase. 相似文献
14.
Two experiments were conducted to determine the interactive effects of phytase with and without a trace mineral premix (TMP) in diets for nursery, growing, and finishing pigs on growth performance, bone responses, and tissue mineral concentrations. Pigs (initial and final BW of 5.5 and 111.6 kg [Exp. 1] or 5.4 and 22.6 kg [Exp. 2]) were allotted to treatments on the basis of BW with eight (Exp. 1) or six (Exp. 2) replications of six or seven pigs per replicate pen. Pigs were started on the diets the day of weaning (average of 18 d). In both experiments, the treatments were with or without 500 phytase units/kg of diet and with or without the TMP in a 2 x 2 factorial arrangement. The Ca and available P concentrations were decreased by 0.10% in diets with phytase. The nursery phase consisted of Phase I (7 d), Phase II (14 d), and Phase III (13 d) periods. In Exp. 1, 26 of 52 pigs fed the diet without the TMP and without phytase had severe skin lesions and decreased growth performance; therefore, pigs fed this diet were switched to the positive control diet. In Exp. 2, the treatment without the TMP and without phytase had 12 replications instead of six. At the end of Phase III, half these replications were switched to the positive control diet and half were switched to the diet without the TMP but with phytase. In Exp. 1 during Phases II and III and in the overall data, pigs fed the diet without the TMP had decreased ADG and ADFI, but the addition of phytase prevented these responses (phytase x TMP; P < 0.02). Growth performance was not affected by diet during the growing-finishing period. Coccygeal bone Zn and Na concentrations were decreased (P < 0.09) in pigs fed the diet without the TMP, and adding phytase increased (P < 0.03) Zn and Fe concentrations. In Exp. 2 during Phases I and II, pigs fed the diet without the TMP had decreased ADG, but the addition of phytase prevented this response (phytase x TMP; P < 0.10). Pigs fed the diet without the TMP had decreased (P < 0.10) ADG (Phase II and overall), ADFI (Phases II and III and in the overall data), and G:F (Phase III). Coccygeal bone Zn and Cu concentrations were decreased (P < 0.09) in pigs fed the diet without the TMP, and adding phytase increased (P < 0.03) Zn concentration in the bones. These data indicate that removing the TMP in diets for nursery pigs decreases growth performance and bone mineral content, and that phytase addition to the diet without the TMP prevented the decreased growth performance. 相似文献
15.
Three experiments were conducted to determine the effects of phytase, excess Zn, or their combination in diets for nursery pigs. In all experiments, treatments were replicated with five to seven pens of six to seven pigs per pen, dietary Ca and available P (aP) levels were decreased by 0.1% when phytase was added to the diets, excess Zn was added as ZnO, a basal level of 127 mg/kg of Zn (Zn sulfate) was present in all diets, and the experimental periods were 19 to 21 d. In Exp. 1, pigs (5.7 kg and 18 d of age) were fed two levels of phytase (0 or 500 phytase units/kg) and three levels of excess Zn (0, 1,000, or 2,000 ppm) in a 2 x 3 factorial arrangement. Added Zn linearly increased ADG and ADFI during Phase 1 (P = 0.01 to 0.06), Phase 2 (P = 0.02 to 0.09), and overall (P = 0.01 to 0.02). Gain:feed was linearly increased by Zn during Phase 1 (P = 0.01) but not at other times. Dietary phytase decreased ADG in pigs fed 1,000 or 2,000 ppm Zn during Phase 2 (Zn linear x phytase interaction; P = 0.10), did not affect (P = 0.27 to 0.62) ADFI during any period, and decreased G:F during Phase 2 (P = 0.01) and for the overall (P = 0.07) period. Plasma Zn was increased by supplemental Zn (Zn quadratic, P = 0.01) but not affected (P = 0.70) by phytase addition. In Exp. 2, pigs (5.2 kg and 18 d of age) were fed two levels of phytase (0 or 500 phytase units/kg) and two levels of Zn (0 or 2,000 ppm) in a 2 x 2 factorial arrangement. Supplemental Zn increased ADG and G:F during Phase 2 (P = 0.02 to 0.09) and overall (P = 0.07 to 0.08), but it had no effect (P = 0.11 to 0.89) on ADG during Phase 1 or ADFI during any period. Phytase supplementation increased ADG (P = 0.06) and G:F (P = 0.01) during Phase 2. Gain:feed was greatest for pigs fed 2,000 ppm Zn and phytase (Zn x phytase interaction; P = 0.01). Bone (d 20) and plasma Zn (d 7 and 20) were increased (P = 0.01) by added Zn but not affected (P = 0.51 to 0.90) by phytase. In Exp. 3, pigs (5.7 kg and 19 d of age) were fed a basal diet or the basal diet with Ca and aP levels decreased by 0.10% and these two diets with or without 500 phytase units/kg. Supplemental phytase had no effect (P = 0.21 to 0.81) on growth performance. Reduction of dietary Ca and aP decreased (P = 0.02 to 0.08) ADG, ADFI, and G:F for the overall data. These results indicate that excess dietary supplemental Zn increases ADG and plasma and bone Zn concentrations. Dietary phytase did not affect plasma or bone Zn concentrations. 相似文献
16.
A 28-d experiment was conducted using 126 crossbred barrows to evaluate the addition of a genetically engineered Escherichia coli phytase to diets that were 0.15% deficient in available P. Growth performance, bone strength, ash weight, and the apparent absorption of P, Ca, Mg, N, energy, DM, Zn, Fe, and Cu were the response criteria. The pigs (2 pigs/pen) averaged 7.61 kg of BW and 30 d of age initially. The low-P basal diet was supplemented with 0, 100, 500, 2,500, or 12,500 units (U) of E. coli phytase/kg of diet, or 500 U of Peniophora lycii phytase/kg of diet. The positive control (PC) diet was adequate in available P. Pigs were fed the diets in meal form. Fecal samples were collected from each pig from d 22 to 27 of the experiment. There were linear and quadratic increases (P < 0.001) in 28-d growth performance (ADFI, ADG, and G:F), bone breaking strength and ash weight, and the apparent absorption (g/d and %) of P, Ca, and Mg (P < or = 0.01 for quadratic) with increasing concentrations of E. coli phytase. Pigs fed the low-P diets containing 2,500 or 12,500 U/kg of E. coli phytase had greater (P < or = 0.01 or P < 0.001, respectively) values for growth performance, bone breaking strength and ash weight, and the apparent absorption (g/d and %) of P, Ca, and Mg than pigs fed the PC diet. The addition of E. coli phytase did not increase the apparent percentage absorption of N, GE, DM, Zn, Fe, or Cu. There were no differences in the efficacy of the E. coli or P. lycii phytase enzymes at 500 U/kg of low-P diet for any criterion measured. In conclusion, there were linear increases in growth performance, bone breaking strength and ash weight, and the apparent absorption of P, Ca, and Mg with increasing addition of E. coli phytase up to 12,500 U/kg of diet. Also, all of these criteria were greater for pigs fed the low-P diets containing 2,500 or 12,500 U of E. coli phytase/kg than for pigs fed the PC diet. The addition of 500, 2,500, or 12,500 U of E. coli phytase/kg of low-P diet reduced P excretion (g/d) in manure by 35, 42, and 61%, respectively, compared with pigs fed the PC diet. 相似文献
17.
Supplementation of carbohydrases or phytase individually or in combination to diets for weanling and growing-finishing pigs 总被引：1，自引：0，他引：1
The overall objective of the studies reported here was to evaluate the growth and nutrient utilization responses of pigs to dietary supplementation of phytate- or nonstarch polysaccharide-degrading enzymes. In Exp. 1, growth performance and nutrient digestibility responses of forty-eight 10-kg pigs to dietary supplementation of phytase or a cocktail of xylanase, amylase, and protease (XAP) alone or in combination were evaluated. The growth response of one hundred fifty 23-kg pigs to dietary supplementation of phytase or xylanase individually or in combination was studied in Exp. 2 in a 6-wk growth trial, whereas Exp. 3 investigated the nutrient digestibility and nutrient retention responses of thirty 24-kg pigs to dietary supplementation of the same enzymes used in Exp. 2. In Exp. 1, the pigs were used in a 28-d feeding trial. They were blocked by BW and sex and allocated to 6 dietary treatments. The treatments were a positive control (PC) diet; a negative control (NC) diet marginally deficient in P and DE; NC with phytase added at 500 or 1,000 phytase units (FTU)/kg; NC with xylanase at 2,500 units (U)/kg, amylase at 400 U/kg, and protease at 4,000 U/kg; and NC with a combination of phytase added at 500 FTU/kg and XAP as above. In Exp. 2 and 3, the 5 dietary treatments were positive control (PC), negative control (NC), NC plus 500 FTU of phytase/kg, NC plus 4,000 U of xylanase/kg, and NC plus phytase and xylanase. In Exp. 1, low levels of nonphytate P and DE in the NC diet depressed (P < 0.05) ADG of the pigs by 16%, but phytase linearly increased (P < 0.05) ADG by up to 24% compared with NC. The cocktail of XAP alone had no effect on ADG of pigs, but the combination of XAP and phytase increased (P < 0.05) ADG by 17% compared with the NC treatment. There was a linear increase (P < 0.01) in Ca and P digestibility in response to phytase. In Exp. 2, ADG was 7% greater in PC than NC (P < 0.05); there were no effects of enzyme addition on any response. In Exp. 3, addition of phytase alone or in combination with xylanase improved (P < 0.05) P digestibility. Phosphorus excretion was greatest (P < 0.01) in the PC and lowest (P < 0.05) in the diet with the combination of phytase and xylanase. The combination of phytase and xylanase improved P retention (P < 0.01) above the NC diet to a level similar to the PC diet. In conclusion, a combination of phytase and carbohydrases improved ADG in 10-kg but not 23-kg pigs, but was efficient in improving P digestibility in pigs of all ages. 相似文献
18.
日粮中添加硫酸钠对肉兔生产性能及肉品品质的影响 总被引：3，自引：0，他引：3
选择４５日龄太行山兔１００只，研究在含硫氨基酸水平不同的日粮中添加硫酸钠对其生产性能及肉质的影响。结果表明：在含硫氨基酸达到需要量８０％～９６％的日粮中添加０．２％～０．４％硫酸钠，均能明显提高肉兔的日增重、饲料转化率、屠宰率及经济效益。其中以含硫氨基酸为需要量的９６％时添加０．２％硫酸钠效果最佳，日增重，饲料转化率，屠宰率及经济效益分别提高２１．０２％（Ｐ＜０．０１）、１７．５６％、１２．３０％ 相似文献
19.
Influence of dietary urea level on digestive function and growth performance of cattle fed steam-flaked barley-based finishing diets 总被引：1，自引：0，他引：1
Four Holstein steers (282 kg) with cannulas in the rumen and proximal duodenum were used in a 4 x 4 Latin square experiment to evaluate the influence of dietary urea level (0, 0.4, 0.8, and 1.2%, DM basis) in a steam-flaked barley-based finishing diet on digestive function. There were no treatment effects (P > 0.20) on ruminal digestion of OM and ADF. Increasing dietary urea level increased (linear, P < 0.01) ruminal starch digestion. Ruminal degradability of protein in the basal diet (no supplemental urea) was 60%. Increasing dietary urea level did not increase (P > 0.20) ruminal microbial protein synthesis or nonammonia N flow to the small intestine. There were no treatment effects (P > 0.20) on total-tract ADF digestion. Total tract digestion of OM (quadratic, P < 0.01) and starch (linear, P < 0.05) increased slightly with increasing urea level. Urea supplementation increased (linear, P < 0.01) ruminal pH 1 h after feeding; however, by 3 h after feeding, ruminal pH was lower (cubic, P < 0.05) with urea-supplemented diets. Urea supplementation did not affect (P > 0.20) ruminal molar proportions of acetate and propionate. One hundred twenty crossbred steers (252 kg; approximately 25% Brahman breeding) were used in an 84-d feeding trial (five pens per treatment) to evaluate treatment effects on growth performance. Daily weight gain increased (linear, P = 0.01) with increasing urea level, tending to be maximal (1.53 kg/d; quadratic, P = 0.13) at the 0.8% level of urea supplementation. Improvements in ADG were due to treatment effects (linear, P < 0.01) on DMI. Urea supplementation did not affect (P > 0.20) the NE value of the diet for maintenance and gain. Observed dietary NE values, based on growth performance, were in close agreement with expected based on tabular values for individual feed ingredients, averaging 100.4%. We conclude that with steam-flaked barely-based finishing diets, ruminal and total-tract digestion of OM and ruminal microbial protein synthesis may not be increased by urea supplementation. In contrast, ADG was optimized by dietary inclusion of 0.8% urea. Urea supplementation may not enhance the net energy value of steam-flaked barely-based finishing diets when degradable intake protein is greater than 85% of microbial protein synthesis. 相似文献