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1.
大豆黄酮对肉鸡生长的影响及其作用机制研究 总被引：31，自引：0，他引：31
日粮中添加３ｇ／ｔ大豆黄酮，对８７只３２日龄红布罗肉鸡进行了２８天生长对比试验。结果表明：与对照组比较，实验组公肉鸡日增重提高１０．１％（Ｐ＜０．０１），胸肌重和腿肌重分别提高６．５％（Ｐ＜０．０５）和７．２％（Ｐ＜０．０５），胸肌总ＲＮＡ含量显著提高，但总ＤＮＡ含量无显著变化；血清尿酸水平也下降１４．２％（Ｐ＜０．０５）。提示大豆黄酮促进公肉鸡肌细胞肥大肌肉蛋白质沉积。同时大豆黄酮显著提高公肉鸡血清睾酮含量；但对母肉鸡日增重和雌二醇水平无显著影响。 相似文献
2.
甜菜碱促进猪生长的机理 总被引：15，自引：5，他引：10
９６ 头“杜长大”生长猪按饲养试验要求分成 ４ 组（每组 ３ 个重复）,分别饲 以添加 ０、１ ０００、１ ５００、２ ０００ ｍ ｇ／ｋｇ甜菜碱的基础日粮,试验期 ６２ ｄ。结果表明,１ ０００ ｍ ｇ／ｋｇ 剂量组试验猪生长性能最佳,日增重较对照组提高了 １３２０％ （ Ｐ ＜ ００１）, 料重比降低了 ７９３％ （ Ｐ ＜ ００１）。该组猪血清 Ｇ Ｈ、 Ｉ Ｇ Ｆ Ｉ、 Ｔ３ 、 Ｔ４ 水平分别升高了 １０１７６％ （ Ｐ＜ ００１）, ４４７５％ （ Ｐ ＜ ００１）, ２６５３％ （ Ｐ＜ ００１） 和 １６８３％ （ Ｐ＜ ００５）; 血清游离丝氨酸含量提高了 １４２８％ （ Ｐ ＜ ００５）; 血清总蛋白上升了 ２１６９％ （ Ｐ ＜ ００１）, 血清尿素氮含量降低 了 ４７６７％ （ Ｐ ＜ ００１）; 背最 长肌 和 肝脏 中 Ｒ Ｎ Ａ 含量 及 背最 长肌 Ｒ Ｎ Ａ／ Ｄ Ｎ Ａ 比 率分 别升 高了１２６０％ （ Ｐ ＜ ００５）, １７８０％ （ Ｐ ＜ ００２） 和 １９７９％ （ Ｐ ＜ ００２）; 肝脏 和腺 垂体 ｃ Ａ Ｍ Ｐ 含 量提 高了４７５３％ （ Ｐ ＜ ００１） 和 ６５２１％ （ Ｐ ＜ ００１）。研究结果提示,甜菜碱似作用 相似文献
3.
中草药“增蛋灵”对蛋鸡血液生化和产蛋率的影响 总被引：2，自引：0，他引：2
由９味中草药组成的“增蛋灵”蛋鸡饲料添加剂，按１．５％的比例加入蛋鸡日粮中，经过２０００只罗曼蛋鸡９０天的饲喂试验证明，中草药“增蛋灵”对蛋鸡的血液生化有显著的影响，使血红蛋白含量增加２．８ｇ％（Ｐ＜０．０１）、血清总蛋白含量增加０．８５ｇ％（Ｐ＜０．０５）、血清白蛋白含量增加０．７３ｇ％（Ｐ＜０．０５）、血清胆固醇含量增加３７．０７ｍｇ％（Ｐ＜０．０１）、血清碱性磷酸酶（ＡＫＰ）活性提高８．２２ＩＵ（Ｐ＜０．０５）、血清胆碱脂酶（ＣＨＥ）活性下降１９．３６ＩＵ（Ｐ＜０．０１）。而且能提高蛋鸡产蛋率５．２１％，提高饲料利用率７．２７％。 相似文献
4.
以钙：锌＝３３０：１与５１６：１的日粮饲喂健康断乳仔猪１２０天，复制了仔猪皮肤角化不全症。患病仔猪被毛中锌、铜含量呈逐渐下降趋势，锌含量极显著低于正常组（Ｐ＜０．０１），而铜含量则与正常组差异不显著（Ｐ＞０．０５）。患病仔猪肝、十二指肠、肠系脱淋巴结中锌含量极显著低于正常组（Ｐ＜０．０１），心、肾、脑中锌含量著低于正常组（Ｐ＜０．０５），脾、肺、左侧最后肋骨、背最长肌、胰中锌含量与正常组差异不显著（Ｐ＞０．０５），肝、背最长肌中铜含量极显著高于正常组（Ｐ＜０．０１），脾中铜含量显著高于正常用（ｐ＜０．０５），脑、心中铜含量极显著低于正常组（Ｐ＜０．０１），肾中铜含量显著低于正常用（Ｐ＜０．０５），其余组织中铜含量与正常组差异不显著（Ｐ＞０．０５）。本试验测定了正常仔猪和用化不全症仔猪各组织中锌、铜的含量，报告了角化不全症仔猪心、肺、肠系膜淋巴结中锌、钢含量及被毛中锌、钢含量的动态变化。 相似文献
5.
影响棉籽饼有效赖氨酸含量因素的试验研究 总被引：2，自引：0，他引：2
本试验模拟螺旋压榨榨油工艺，测定不同蒸炒或加热条件对棉籽饼中自由棉酚（ＦＧ）、还原糖（ＲＳ）、有效赖氨酸（Ａ－Ｌｙｓ）含量的影响。对蒸炒前喷洒硫酸亚铁的作用也做了初步探讨。研究发现，加热强度、棉酚结合、还原糖含量与有效赖氨酸含量之间的相关系数分别为－０．９７６５（Ｐ＜０．０１）、－０．９５１５（Ｐ＜０．０１）、０．４３９５（Ｐ＞０．０５）；蒸炒前添加ＦｅＳＯ４，按Ｆｅ∶ＦＧ摩尔比４．５∶１和９∶１时均极显著地（Ｐ＜０．０１）提高Ａ－Ｌｙｓ含量，两剂量组间无差异（Ｐ＞０．０５）；按４．５∶１添加ＦｅＳＯ４可提高Ａ－Ｌｙｓ７．６０％～３７．７７％，同时表明，ＦＧ含量显著降低。 相似文献
6.
维生素A对肉用仔鸡锌吸收利用的影响 总被引：5，自引：0，他引：5
以玉米—豆饼型基础日粮不添加维生素Ａ（ＶＡ，５５００单位／千克）或锌（锌，前期５５、后期４４毫克／千克）或两者均添加（对照）饲喂１—６周龄ＡｒｂｏｒＡｃｒｅｓ（ＡＡ）肉用仔鸡。结果显示，日粮ＶＡ或锌不足均明显降低了３周龄（Ｐ＜０．０１）和６周龄（ＶＡ不足Ｐ＜０．０５，锌不足Ｐ＜０．０１）血清锌浓度；显著减少了３周龄胫骨锌（Ｐ＜０．０１）和胫骨灰锌（ＶＡ不足Ｐ＜０．０５，锌不足Ｐ＜０．０１）含量；ＶＡ不足组胫骨和胫骨灰中锌含量都显著高于锌不足组（Ｐ＜０．０１），但两组间３周龄和６周龄血清锌均无显著差异。不同处理对６周龄胫骨锌沉积未见有明显影响（Ｐ＞０．０５）。 相似文献
7.
３日龄肉用ＡＡ雏鸡成髓细胞性白血病强毒（ｖＡＭＶ）人工感染后,鸡成髓细胞性白血病（ＡＭＢ）发病率８６．７％、死亡率７０％,脾脏、胸腺、法氏囊、心脏、肝脏、肾脏和性腺超氧化物歧化酶（ＳＯＤ）活性与健康对照雏鸡相比,Ｔ－ＳＯＤ和Ｍｎ－ＳＯＤ活性于１０日龄时均极显著升高（Ｐ＜０．０１）,于１７日龄时则极显著下降（Ｐ＜０．０１）,以后日龄亦有明显降低（Ｐ＜０．０５,Ｐ＜０．０１）,而Ｃｕ,Ｚｎ－ＳＯＤ活性于１０和２４日龄无明显变化（Ｐ＞０．０５）、１７日龄时显著或极显著降低（Ｐ＜０．０５,Ｐ＜０．０１）,３０日龄则明显升高（Ｐ＜０．０５,Ｐ＜０．０１）。 相似文献
8.
外源性环核苷酸对肉鸡性能及胴体品质的影响 总被引：6，自引：0，他引：6
选用ＡＡ商品代肉鸡初生健雏１００只，随机分成对照组和试验组，每组５０只，两组均在相同条件下饲养。对照组颈部皮下注射生理盐水，剂量为０．１ｍＬ／只；试验组颈部皮下注射与对照组等剂量的外源性环核苷酸（ＣＮＴ）制剂，每隔４ｄ一次。试验期为４９ｄ。试验统计结果表明：试验组鸡体重、饲料利用率和成活率比对照组分别提高了７．１７％（Ｐ＜０．０１），８．１３％（Ｐ＜０．０１）和３．１６％（Ｐ＜０．０５）。公、母鸡的半净膛屠宰率、全净膛屠宰率、胸肌率、腿肌率试验组鸡比对照组鸡分别提高了（♂）２．１９，１．８５，２．４３（Ｐ＜０．０１），１．１２个（Ｐ＜０．０５）个百分点和（♀）１．２２，１．８８，２．５３（Ｐ＜０．０１），２．４１个（Ｐ＜０．０１）百分点。腹脂、皮脂和肌间脂分别降低了（♂）０．５６，０．０９（Ｐ＜０．０１），０．１７个百分点（Ｐ＜０．０１）和（♀）０．５０（Ｐ＜０．０５），０．０６（Ｐ＜０．０１），０．１８个百分点（Ｐ＜０．０１）。 相似文献
9.
高碘日粮对蛋鸡生产性能,体内代谢和蛋品质的影响 总被引：3，自引：0，他引：3
日粮加碘６５ｐｐｍ饲喂蛋鸡，破壳率减少（Ｐ＜０．０５），饲料消耗降低（Ｐ＜０．０１），采食量、产蛋量和蛋重无明显影响（Ｐ＜０．０５），肝中ＧＯＴ和ＧＰＴ酶活性显著上升（Ｐ＜０．０１），ＡＫＰ明显升高（Ｐ＜０．０５），血清中ＡＫＰ明显增加（Ｐ＜０．０５），ＳＯＤ提高显著（Ｐ＜０．０５），而肝中ＣＤＨ和ＣＫ，血清中ＬＤＨ，ＧＯＴ、ＧＰＴ和ＣＫ无显著差异（Ｐ＜０．０５），ＳＯＤ提高显著（Ｐ＜０．０５）， 相似文献
10.
低蛋白质氨基酸平衡饲粮对早期断奶仔猪腹泻和生产性能的影响 总被引：8，自引：2，他引：6
《中国畜牧杂志》1995,(4):11-13
本研究选用１８头２８±１日龄断奶的杂交仔猪（平均体重约５．５ｋｇ），研究低蛋白质氨基酸平衡饲粮对早期断奶仔猪腹泻和生产性能的影响。试验结果显示：（１）低蛋白质氨基酸平衡饲粮使仔猪血浆挥发性盐基氨含量、血浆尿素氨含量和腹泻指数降低（Ｐ＜０．０５或０．０１）。（２）采食全植物蛋白型氨基酸平衡饲粮（ＣＰ１８．３％）的仔猪，其平均日增重（ＡＤＧ）、平均日采食量（ＡＤＦＩ）和料肉比（Ｐ／Ｇ）与采食复合蛋白型对照饲粮（ＣＰ１９．７％）的仔猪差异不显著（Ｐ＞０．０５），但前者的增重成本比后者降低（Ｐ＜０．０５）３１％。（３）采食复合蛋白型氨基酸平衡饲粮（ＣＰ１８．４％）的仔猪的生产性能优于采食复合蛋白型对照饲粮（ＣＰ１９．７％）的仔猪，前者的ＡＤＧ和ＡＤＦＩ分别提高（Ｐ＜０．０５）６１％和３２％，Ｆ／Ｇ和增重成本分别下降（Ｐ＜０．０５）２４％和３７％。（４）采食全植物蛋白型氨基酸平衡饲粮的仔猪，其ＡＤＧ和ＡＤＦＩ低于（Ｐ＜０．０１）采食复合蛋白型氨基酸平衡饲粮的仔猪。前者的Ｆ／Ｇ和增重成本趋于高于后者，但差异不显著（Ｐ＞０．０５）。以上结果表明，低蛋白质氨基酸平衡饲粮可显著降低仔猪断奶后腹泻和提高仔猪生产性能。复合蛋白型? 相似文献
11.
用含20mg/kg Ractopamine的饲粮饲喂纯种肥育期大约克猪(始重60 kg,终重90 kg),进行屠宰试验。胴体测定表明:添加Ractopamine明显改变了胴体组成,胴体瘦肉率提高3.53％(P<0.05)。其中半腱肌、背最长肌、半膜肌、股二头肌和腹侧锯肌重量分别增加10.7％(P<0.01)、9.1％(P<0.01)、7.4％(P<0.05)、7％(P<0.05)和4.5％(P<0.05);背最长肌面积增大6.5％(P<0.05);胴体脂肪率降低了3.21％(P<0.05),背膘厚度呈降低趋势,其中髻甲部降低9％(P<0.05)。肉质测定显示,眼肌肉色、大理石纹及失水率等内质指标对照组与试验组均无明显差异,但背最长肌粗蛋白含量提高2.8％(P<0.05),粗脂肪降低3.67％(P<0.01)。 相似文献
12.
Muscle protein metabolism in finishing pigs fed ractopamine 总被引：9，自引：0，他引：9
W G Bergen S E Johnson D M Skjaerlund A S Babiker N K Ames R A Merkel D B Anderson 《Journal of animal science》1989,67(9):2255-2262
Forty crossbred barrows (average initial weight, 66.4 kg) were utilized to determine the effects of ractopamine (a phenethanolamine/beta adrenergic agonist) on protein accretion and synthesis, activities of cathepsins B, H, L and calcium-dependent proteinase and nucleic acid content of semitendinosus muscle (ST). All pigs were offered a 16% protein, mineral and vitamin fortified corn-soybean meal diet supplemented with either 0 or 20 ppm ractopamine for 14, 21, 28, 35 or 42 d. Protein synthesis (fractional rates) was studied in pigs at d 21 and 35; ST protease activities, protein and nucleic acid content were measured on d 14, 28 and 42. Ractopamine increased (P less than .01) ST total protein content and maintained RNA muscle concentration and total ST muscle RNA content. DNA content (mg/g ST) declined (P less than .05) upon ractopamine feeding, but total DNA per muscle remained unchanged except for d 42, when the ST muscles were largest. Fractional accretion rates (FAR) were 1.0 and 1.2% for control and ractopamine-fed pigs, respectively. Fractional protein synthesis rate (FSR) was higher (P less than .06) in ractopamine-fed pigs (6.1%/d) than in control pigs (4.4%/d). Fractional protein synthesis rate could account for the observed muscle hypertrophy and increased FAR. Estimated fractional breakdown rates (FBR = FSR - FAR) were 3.4%/d and 4.9%/d for control and ractopamine-fed pigs, respectively. The activities of the catheptic proteases and calcium-dependent proteinase were not affected by the treatments. 相似文献
13.
本试验发现饲料中添加20×10－6Ractopamine使肥育猪血清中Ca含量升高20．60％（P＜0．05）,碱性磷酸酶活性下降13．02％（P＜0．05）,甲状旁腺激素水平升高50．84％（P＜0．01）,上述结果提示：Rac－topamine能影响肥育猪的钙、磷代谢。 相似文献
14.
Peroxisome proliferator-activated receptor-γ (PPAR-γ) plays a pivotal role in controlling adipogenesis.We hypothesized that changes in dietary energy density might alter fat deposition in finishing pigs via modulation of the expression of PPAR-γ.To test this hypothesis,thirty female finishing pigs were fed diets containing low (LD),medium (MD) or high (HD) energy density.Blood samples were collected on day 53,and then the pigs were sacrificed to collect samples of the dorsal subcutaneous (ST),abdominal (AT) and mesenteric (MT) adipose tissue.Compared with pigs fed the MD diet,malate dehydrogenase activity was increased in the ST and MT of pigs fed the HD diet,while activity was decreased in the MT of pigs fed the LD diet (P0.05).Glucose-6-phosphate dehydrogenase activity was increased in all three fat depots of pigs fed the HD diet (P0.05) in comparison with pigs fed the MD diet.Both HD and LD diets increased the size of the adipocytes in the AT and MT (P0.05).Pigs fed the HD diet had a higher cell proliferation index in the ST compared with pigs fed the other two diets (P0.05).Compared with pigs fed the MD diet,a decreased apoptosis index was seen in the ST of pigs fed the HD diet,and in the AT of pigs fed the LD diet,as well as in the MT of both HD and LD fed pigs (P0.05).PPAR-γ positive percentage was elevated in the ST and MT of HD fed pigs compared with pigs fed the MD and LD diets,while it was decreased in the ST of LD compared with MD fed pigs (P0.05).These results suggest that dietary energy density may regulate fat deposition in finishing pigs.It is possible that feeding a high energy diet may induce fat deposition via up-regulation of PPAR-γ expression. 相似文献
15.
Peroxisome proliferator-activated receptor-γ (PPAR-γ) plays a pivotal role in controlling adipogenesis. We hypothesized that changes in dietary energy density might alter fat deposition in finishing pigs via modulation of the expression of PPAR-γ. To test this hypothesis, thirty female finishing pigs were fed diets containing low (LD), medium (MD) or high (HD) energy density. Blood samples were collected on day 53, and then the pigs were sacrificed to collect samples of the dorsal subcutaneous (ST), abdominal (AT) and mesenteric (MT) adipose tissue. Compared with pigs fed the MD diet, malate dehydrogenase activity was increased in the ST and MT of pigs fed the HD diet, while activity was decreased in the MT of pigs fed the LD diet (P < 0.05). Glucose-6-phosphate dehydrogenase activity was increased in all three fat depots of pigs fed the HD diet (P < 0.05) in comparison with pigs fed the MD diet. Both HD and LD diets increased the size of the adipocytes in the AT and MT (P < 0.05). Pigs fed the HD diet had a higher cell proliferation index in the ST compared with pigs fed the other two diets (P < 0.05). Compared with pigs fed the MD diet, a decreased apoptosis index was seen in the ST of pigs fed the HD diet, and in the AT of pigs fed the LD diet, as well as in the MT of both HD and LD fed pigs (P < 0.05). PPAR-γ positive percentage was elevated in the ST and MT of HD fed pigs compared with pigs fed the MD and LD diets, while it was decreased in the ST of LD compared with MD fed pigs (P < 0.05). These results suggest that dietary energy density may regulate fat deposition in finishing pigs. It is possible that feeding a high energy diet may induce fat deposition via up-regulation of PPAR-γ expression. 相似文献
16.
Weber TE Richert BT Belury MA Gu Y Enright K Schinckel AP 《Journal of animal science》2006,84(3):720-732
An 8-wk study of the effects of CLA, rendered animal fats, and ractopamine, and their interactive effects on growth, fatty acid composition, and carcass quality of genetically lean pigs was conducted. Gilts (n = 228; initial BW of 59.1 kg) were assigned to a 2 x 2 x 3 factorial arrangement consisting of CLA, ractopamine, and fat treatments. The CLA treatment consisted of 1% CLA oil (CLA-60) or 1% soybean oil. Ractopamine levels were either 0 or 10 ppm. Fat treatments consisted of 0% added fat, 5% choice white grease (CWG), or 5% beef tallow (BT). The CLA and fat treatments were initiated at 59.1 kg of BW, 4 wk before the ractopamine treatments. The ractopamine treatments were imposed when the gilts reached a BW of 85.7 kg and lasted for the duration of the final 4 wk until carcass data were collected. Lipids from the belly, outer and inner layers of backfat, and LM were extracted and analyzed for fatty acid composition from 6 pigs per treatment at wk 4 and 8. Feeding CLA increased (P < 0.02) G:F during the final 4 wk. Pigs fed added fat as either CWG or BT exhibited decreased (P < 0.05) ADFI and increased (P < 0.01) G:F. Adding ractopamine to the diet increased (P < 0.01) ADG, G:F, and final BW. The predicted carcass lean percentage was increased (P < 0.05) in pigs fed CLA or ractopamine. Feeding either 5% fat or ractopamine increased (P < 0.05) carcass weight. Adding fat to the diets increased (P < 0.05) the 10th rib backfat depth but did not affect predicted percent lean. Bellies of gilts fed CLA were subjectively and objectively firmer (P < 0.01). Dietary CLA increased (P < 0.01) the concentration of saturated fatty acids and decreased (P < 0.01) the concentration of unsaturated fatty acids of the belly fat, both layers of backfat, and LM. Ractopamine decreased (P < 0.01) the i.m. fat content of the LM but had relatively little effect on the fatty acid profiles of the tissues compared with CLA. These results indicate that CLA, added fat, and ractopamine work mainly in an additive fashion to enhance pig growth and carcass quality. Furthermore, these results indicate that CLA results in more saturated fat throughout the carcass. 相似文献
17.
本试验旨在研究低蛋白质饲粮添加α-酮戊二酸(α-ketoglutarate,AKG)对生长猪氮以及钙、磷代谢的影响。试验选用初始体重为(34.98±2.18)kg的健康三元杂交(杜×长×大)猪18头,按体重相近、性别比例相同原则随机分为3组,每组6个重复,每个重复1头。各组AKG的添加水平分别为0(对照组)、1%和2%。先进行为期14 d的饲养试验,观察生长性能;然后进行消化代谢试验,试验期为7 d,前5 d为预试期,后2 d为粪尿收集期(全收粪法)。结果表明:1)1%AKG添加组有改善35~45 kg生长猪生长性能的趋势,具体表现为提高平均日增重(P=0.194 2)和平均日采食量(P=0.258 3),降低料重比(P=0.419 7)。2)随着AKG添加水平提高,尿氮含量有下降趋势(P=0.143 2),粪氮、总氮含量及总氮排放率极显著降低(P0.01),氮表观消化率和蛋白质净利用率极显著提高(P0.01)。与对照组相比,1%与2%AKG添加组尿氮含量分别降低了13.31%和41.88%,粪氮含量分别降低了18.73%和54.69%,总氮排放率分别降低了20.57%和50.00%,氮表观消化率分别提高了2.60%和6.32%,蛋白质净利用率分别提高了2.68%和6.51%。3)2%AKG添加组钙食入量、粪钙和粪磷含量显著低于对照组(P0.05),而钙表观消化率和磷表观消化率却显著高于对照组(P0.05);尿钙和尿磷含量有低于其他各组的趋势,但各组间差异不显著(P0.05)。由此可见,在35~45 kg的生长猪饲粮中添加1%~2%AKG可有效降低机体氮、钙、磷排放,提高氮及钙、磷的利用率和日增重。 相似文献
18.
Two experiments were conducted to assess the effects of porcine ST (pST) on the responses to a near-ideal blend of AA for pigs from 22 to 60 kg BW. Eighty Hampshire × Yorkshire gilts (40 gilts/experiment) were individually penned and assigned to a 4 × 2 factorial arrangement of treatments, consisting of 4 diets with and without pST injection. A fortified corn-soybean meal basal diet was formulated to contain 1.50% total Lys and Thr, Met, and Trp were added to obtain a near-ideal blend of these AA relative to Lys. In 3 additional diets, Lys was reduced to 1.25%, 1.00%, or 0.75% by diluting the basal diet with cornstarch, cellulose, and sand, such that the diets also contained the same ratios of AA. Pigs that received pST were administered a daily intramuscular injection of 2 mg of pST. Data from the 2 experiments were pooled. Administration of pST increased ADG (P < 0.01), G:F (P < 0.01), and LM area (P < 0.01), and decreased ADFI (P < 0.03), last rib backfat (P < 0.01), and 10th rib backfat (P < 0.01). Also, estimated carcass muscle and calculated lean gain increased (P < 0.01) in pST-treated pigs. Administration of pST also increased (P < 0.01) the percentage, total gain and accretion rate of water, protein, and ash in the carcass, and decreased (P < 0.01) the percentage, total gain, and accretion rate of carcass fat. Growth rate, G:F, and carcass traits improved (P < 0.01), percentage of carcass proteinand water increased (P < 0.01), and carcass fat percentage decreased (P < 0.01) with increasing dietary Lys. The percentage, total gain, and accretion rate of carcass protein increased to a greater extent in pST-treated pigs than in untreated pigs, resulting in a pST × Lys interaction (P < 0.05). The results indicated that pST improves performance, leanness, and protein accretion in pigs from 22 to 60 kg BW, and that these responses to dietary Lys and a near-ideal blend of AA is greater in growing pigs treated with pST than untreated pigs. 相似文献
19.
20.
Assessment of chromium tripicolinate supplementation and dietary protein level on growth,carcass, and blood criteria in growing pigs 总被引：1，自引：0，他引：1
This study was conducted to evaluate potential interactive effects of supplemental Cr and dietary protein levels in growing pigs. Thirty-six individually penned barrows, 22 to 63 kg, were used in a 2 x 3 factorial arrangement of supplemental Cr (0 or 200 ppb from chromium tripicolinate) and protein level (76, 83, or 90% of lysine requirement). A corn-soybean meal basal diet was designed to supply all mineral and vitamin needs, 90% of the estimated metabolizable energy need, and 76% of the estimated protein need at 70% of ad libitum feed intake. Additional protein to 83 or 90% of the lysine requirement was provided by a soy protein isolate supplement. Growth data were collected for a 50-d period, and pigs were killed at a mean of 63 kg BW. Increasing lysine levels linearly (P < 0.01) increased ADG and liver weight. Lysine level had a quadratic effect on 10th rib backfat thickness (P < 0.05) and cooler shrink (P < 0.01) with the highest responses at the 83% lysine level. Increasing lysine level linearly decreased (P < 0.05) carcass content of ash and lipid and quadratically increased the carcass water content (P < 0.01). Carcass accretion rate showed a linear increase for protein (P < 0.01) and water accretion (P < 0.01). Dry matter composition of the longissimus muscle showed linear increases of ash (P < 0.05) and protein (P < 0.01) and a linear decrease of lipid content (P < 0.01) resulting in a linear increase (P < 0.05) of the protein to lipid ratio based on the increasing lysine levels. Pre-feeding insulin levels were increased (P < 0.05) with increasing level of lysine. One hour post-feeding, a quadratic lysine response for plasma glucose (P < 0.05) was observed with the lowest concentration at 83% lysine. Cr addition increased 10th rib backfat thickness (P < 0.10). There was no Cr x lysine level interaction (P > 0.10) observed for any of the growth or carcass traits. Plasma glucose concentrations pre-feeding were lower for Cr-supplemented pigs (P < 0.01). As expected, increasing protein levels in protein-deficient diets increased protein accretion while decreasing lipid accretion in 22 to 63 kg growing pigs; however, these effects were more clearly seen in the longissimus muscle than in the entire carcass. Supplementation of Cr exerted only minor effects with few Cr x lysine interactions observed in this study. 相似文献