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1.
This experiment was conducted to clarify the nutritional functions of rice and phytase addition for broiler chicks. Thirty‐six 7‐day‐old male chicks (ROSS 308 strain) were assigned to one of the four treatment groups: corn‐ or rice‐based diet groups and each diet with added phytase (2000 phytase units/kg diet) groups (corn + P or rice + P groups). The non‐phytate phosphorus (npP) content in the diets with added phytase was approximately half of the requirement. Body weight gain and feed intake in the rice group was significantly higher than those in the corn group. Breast and thigh muscle weights and nitrogen retention in the rice group were significantly higher than that in the corn group. Although the efficiency of phosphorus retention (%) in the corn + P group was significantly higher than that in the corn group, no significant difference was observed between the rice and rice + P groups. Liver threonine dehydrogenase activity in the corn group was significantly higher than in the other three groups. These results indicate that rice is superior to corn as a starter diet in broiler chicks, and that phytase action in the rice‐based diet was less than that in the corn‐based diet.  相似文献   

2.
The experiment was carried out to determine the effects of liquid DL‐methionine hydroxy analog‐free acid (LMA) and dry DL‐methionine (DLM) on growth performance, carcass quality and chemical composition of the livers of broiler chicks during 0–6 weeks of age. Four hundred and fifty male commercial broiler chicks (Ross strain) were used. The chicks were divided into three groups, and each group consisted of six replicates of 25 chicks each. The chicks were kept in floor pens, and water and feed were supplied ad libitum throughout the experiment. Three experimental diets were provided as follows: (i) corn–soybean‐based diet deficient in methionine; (ii) methionine‐deficient corn–soybean‐based diet supplemented with DLM to meet the methionine requirements of broiler chicks; and (iii) methionine‐deficient corn–soybean‐based diet supplemented with LMA (1.25‐fold (w/w) the amount of DLM supplied to the second group, given an assumption that 100 units of liquid LMA can be replaced by 80 units DLM to give similar performance results). During the starter period, the weight gains of chicks fed LMA or DLM were significantly greater than those in chicks receiving the methionine‐deficient diet (P < 0.05), and the addition of LMA significantly improved weight gain compared with the addition of DLM. Adding DLM or LMA significantly improved the feed conversion ratio (FCR) and percentage of uniformity (P < 0.05). No significant differences between the effects of DLM and LMA on these parameters were found. During the grower period (3–6 weeks of age), weight gain, FCR, uniformity and feed intake of chicks that received diet supplemented with DLM or LMA were superior to those of the methionine‐deficient group (P < 0.05). Chicks fed LMA had the same bodyweight gain and uniformity as those fed DLM. However, adding LMA resulted in a significant increase of FCR resulting from excess feed consumption. Outer breast meat yields were significantly improved and abdominal fat was significantly decreased when methionine sources were added (P < 0.05), and adding LMA tended to promote edible meat growth better than did adding DLM. Although no significant effects of methionine sources on the chemical composition of the liver were seen, adding methionine sources tended to increase liver fat content. In conclusion, it seems that the bioefficacy of LMA relative to DLM is not less than 80%. Therefore, chicks fed with diet supplemented with 1.25‐fold (w/w) as much LMA as DLM might exceed requirements for growth performance, while meeting requirements for meat production. Moreover, the relative bioefficacies of LMA and DLM between the starter and grower periods may perhaps be different.  相似文献   

3.
An experiment was conducted to compare a commercial corn–soya bean meal diet with a pearl millet (raw and sprouted) diet containing less soya bean meal, alone or in combination with exogenous enzyme, on growth performance and ileal villus development of chicks. Two‐hundred‐and‐forty‐one‐day‐old male broilers (10/pen) were randomly allocated to one of the following dietary treatments: (i) a standard corn–soya bean meal control diet (CTL); (ii) a raw pearl millet‐soya bean meal diet (PM); (iii) a sprouted pearl millet‐soya bean meal diet (SPM); (iv) CTL + exogenous enzymes (CE); (v) PM + exogenous enzymes (PE); and (vi) SPM + exogenous enzymes (SPE) with four replicate pens/treatment. Body weight of birds at day 21 did not differ between those fed the CTL, and SPM and PE diets. In comparison with feeding broilers the CTL diet, feeding the PE and SPM diets caused significant decrease in feed intake, but with equivalent growth and feed efficiency. However, at day 21, feed conversion ratio did not differ between birds fed the CTL diet and those fed the PM, PE and SPM diets. At day 21, broilers fed the PM and PE diets had longer villi (p < 0.05) than those fed the CTL diet. At day 21, villi width was reduced (p < 0.05) by raw pearl millet supplementation than CTL diet. It is concluded that, in comparison with corn, broiler diets formulated with sprouted pearl millet or pearl millet with enzyme require less soya bean meal and can be used to improve growth performance traits and villus development.  相似文献   

4.
We investigated the effects of rice feeding on growth performance and protein (amino acids) metabolism of weanling piglets. In all, 16 weanling piglets with an average initial weight of 7.5 kg were divided into two groups. One group was fed a corn‐soybean meal‐based diet, and the other was fed a rice‐soybean meal diet, containing around 46% of corn or rice, respectively. A two‐week growth trial was conducted. The average daily gain (p = .025) and feed efficiency (p = .011) in rice‐fed piglets were significantly higher than those in corn‐fed piglets. Liver lysine‐ketoglutarate reductase activity tended to be lower (p = .073) in rice‐fed piglets than in corn‐fed piglets. Plasma urea nitrogen concentration in rice‐fed piglets was significantly lower than that in corn‐fed piglets. Plasma glucose and insulin concentrations were significantly higher in rice‐fed piglets than in corn‐fed piglets. Plasma‐free valine, isoleucine, and tryptophan concentrations were significantly higher in rice‐fed piglets than in corn‐fed piglets. In contrast, plasma histidine concentration was significantly lower in rice‐fed piglets than in corn‐fed piglets. Overall, these results show that rice feeding improves the growth performance and affects the protein (amino acids) metabolism in weanling piglets.  相似文献   

5.
共轭亚油酸对肉仔鸡体组成和肉品品质的影响   总被引：1，自引：3，他引：1  
本试验旨在探讨日粮添加共轭亚油酸(CLA)对肉仔鸡体组成和肉品品质的影响。240只1日龄肉仔鸡随机分配到4个日粮处理组(0%、0.25%、0.5%和1%CLA),每个处理6个重复,每个重复10只鸡。试验结果表明:42d时,0.5%和1%CLA组肉仔鸡胸肌率显著高于对照组(P<0.05),1%CLA组肉仔鸡42d腿肌率显著高于对照组,肉仔鸡的腹脂率在各处理之间没有显著差异(P>0.05),1%CLA组肉仔鸡胸肌粗蛋白质粗脂肪比显著高于对照组(P<0.05)。0.5%、1%CLA组肉仔鸡胸肌滴水损失和丙二醛(MDA)含量显著降低(P<0.05)。试验结果表明,CLA可改善肉仔鸡屠体性状,增加鸡肉系水力和延长货架存放时间。  相似文献   

6.
Evaluation of transgenic event CBH 351 (StarLink) corn in broiler chicks   总被引：3，自引：0，他引：3  
The influence of transgenic event CBH 351 (StarLink; SL)-derived hybrid corn on the growth performance, health condition and physiological function in broiler chicks, as well as the possible transfer of the cry9C gene and Cry9C protein to blood, liver and muscle were examined in comparison with chicks fed on a diet with non-transgenic corn (SL-F). Bodyweight gain and feed conversion ratio in the chicks fed on a diet with SL were significantly greater than in chicks fed on a diet with SL-F during the starter phase (0–3 weeks of age), but this significant difference disappeared during the finisher phase (4–7 weeks of age). No abnormalities in health condition in either SL or SL-F groups were observed, and livability did not differ significantly between SL and SL-F groups. Moreover, no significant differences in serum biochemical and hematological values, histopathological observation and necropsy findings were observed between SL and SL-F groups at the end of the experiment. The cry9C gene and Cry9C protein were not detected in blood, liver and muscle of chicks at 3, 5 or 7 weeks of age. The results indicate that feeding SL does not influence growth performance, health condition or physiological function in broiler chicks, and the cry9C gene and Cry9C protein are not transferred to the blood, liver and muscles of broilers.  相似文献   

7.
The effect of L‐carnitine supplementation on mitogen (concanavalin A, Con A) induced proliferation of mononuclear cells (MNC) in the spleen was investigated in broiler chickens at different ages. Day‐old chickens were fed a diet supplemented with or without L‐carnitine (100 ppm) for 24 days. The carnitine‐supplemented group showed greater proliferation of MNC in the spleen in response to Con A than that of the control group at 24 days of age. In addition, at 24 days of age the carnitine‐supplemented group showed higher expression of interleukin (IL)‐2 and interferon (IFN)‐γ mRNA, but lower expression of inducible nitric oxide synthase (iNOS) in the Con A‐stimulated splenic MNC than the control group. The enhancement effect of L‐carnitine on MNC proliferation and IL‐2 mRNA expression was not found in chicks at 14 days of age. Addition of L‐carnitine (50 nmol/mL) to the culture medium enhanced proliferation and IL‐2 mRNA expression of splenic MNC obtained from 24‐day‐old but not from 14‐day‐old broiler chickens. The results suggest that L‐carnitine is capable of enhancing MNC proliferation in broiler chickens at 24 days of age partly through increasing IL‐2 and IFN‐γ production and decreasing NO production.  相似文献   

8.
香辛型中草药添加剂对肉仔鸡生长和屠宰性能的影响   总被引：10，自引：0，他引：10  
黄冠庆  杜炳旺 《中国家禽》2004,26(14):17-18
选用120只21日龄肉仔鸡，随机分成对照组和试验组2组，每组3个重复，对照组饲喂基础日粮，试验组饲喂在基础日粮中添加0．5％香辛型中草药添加剂的日粮，经21天的饲喂试验，研究香辛型中草药添加剂对肉用仔鸡生长和屠宰性能的影响，结果表明：在肉用仔鸡日粮中添加香辛型中草药添加剂可显著提高肉用仔鸡的体重、平均日增重、腿肌率和胸肌pH值，显著降低腹脂率和皮脂厚。  相似文献   

9.
An experiment was conducted to determine the effects of different amounts of dietary methionine on growth performance, serum protein, growth hormone (GH), insulin‐like growth factor‐I (IGF‐I) concentrations and IGF‐I mRNA expression of growing meat rabbits. One hundred weaned growing meat rabbits were allocated to individual cages and randomly divided into five groups. The methionine addition concentrations of the five groups were 0, 2, 4, 6 and 8 g/kg diet (as‐fed basis) and sulphur amino acids (SAA) concentrations ranging from 3.8 to 11.6 g/kg diet, respectively. The results obtained were as follows: the average daily gain of 2, 4 and 6 g/kg diet groups was higher than that of 0 g/kg diet group (p < 0.01). The feed gain ratio of the 4 g/kg diet group was lower than those of 0 and 8 g/kg diet group (p < 0.01). Methionine concentrations did not affect serum urea nitrogen, total protein, insulin and IGF‐I concentration (p > 0.05). The quadratic effects of methionine on the serum concentration of albumin (Alb) and GH were obtained (p = 0.013, p = 0.018). The quadratic effect of methionine amount on IGF‐I mRNA expression was obtained (p = 0.045). The serum concentration of Alb of the 4 g/kg diet group was higher than those of 0 and 8 g/kg diet group (p < 0.01). The serum concentration of GH of 8 g/kg diet group was higher than that of the 0 g/kg diet group (p < 0.05). The liver IGF‐I mRNA expression of 4 g/kg diet group was higher than those of the 0 and 8 g/kg diet group (p < 0.05). Providing a diet mainly consisted of corn, wheat bran and peanut vine, the optimum dietary methionine addition concentration and SAA concentration for a weaner to 2‐month‐old growing meat rabbits were shown to be 2 and 5.7 g/kg diet respectively.  相似文献   

10.
The objective of this study was to eval- uate the effects of inorganic phosphorus source and phytase addition on performance, nutrient digestibility and bone mineralization in broiler chickens. In Exp. 1,150 two-day old, male broiler chicks were fed a corn-soybean meal basal diet supplemented with phos- phorus provided by dicalcium phosphate, tricalcium phosphate or defluorinated rock phosphate. Five cages containing 10 birds were allotted to each of the three treatments. In Exp. 2,120 three-day old, male broiler chicks were fed the basal diet from Exp. 1 supplemen- ted with 0,250,500 ,or 1,000 P-＇rU phytase per kg of diet. Six cages containing five chicks were allotted to each of the four treatments. In Exp. 1, there was no difference in weight gain, feed intake or feed conver- sion as a result of feeding the different sources of in- organic phosphorus. The digestibility of phosphorus was significantly lower （P =0.01 ） for chicks fed di- ets supplemented with tricalcium phosphate than for chicks fed the other two diets. However, despite the lower digestibility, serum phosphorus levels did not differ among the three treatments. For Exp. 2, feedconversion showed a linear improvement （P = 0.03 ） with increasing levels of phytase inclusion （ days 0 to 33 ）. Phytase supplementation resulted in linear increa- ses in the digestibility of dry matter （P = 0.02 ）, crude protein （ P --- 0.04 ） and energy （ P 〈 0.01 ）. Chicks fed 1,000 FTU/kg phytase had significantly higher bone calcium （ P = 0.05 ） and bone breaking strength （P = 0.04 ） than chicks fed the basal diet on day 33. In conclusion, the results of the current study indicated that the performance of birds fed diets sup- plemented with dicalcium phosphate, tricalcium phos- phate or defluorinated phosphate was similar and therefore production costs could be lowered by choo- sing the cheapest inorganic phosphorus source when formulating diets for poultry. When diets were formu- lated to meet dietary phosphorus requirements, the growth of broilers was not enhanced with phytase sup- plementation. However, increases in feed conversion and bone breaking strength and its potential to impact culling and mortality in broiler operations may be suf- ficient justification for the routine inclusion of phytase in diets fed to broilers.  相似文献   

11.
试验采用2×2因子设计(日粮类型0%或1%CLA,肉鸡性别)研究日粮CLA对不同性别肉仔鸡生长性能、屠体性状和脂肪代谢相关酶的影响。结果表明:日粮中添加1%CLA可以显著增加各性别肉仔鸡各阶段的体增重,并改善了4～6、0～6周的饲料转化效率(P<0.05),可以显著提高各性别肉仔鸡的胸肌率、同时显著降低各性别肉仔鸡的腹脂率(P<0.05),显著降低了各性别肉仔鸡腹脂脂蛋白脂酶(LPL)活性及其mRNA相对表达量(P<0.05),显著降低了各性别肉仔鸡腹脂及肝脏硬脂酰辅酶A去饱和酶(SCD)mRNA相对表达量(P<0.05)。另外除体增重部分指标外,性别和日粮CLA对肉仔鸡屠体性状和脂肪代谢相关酶的影响不存在互作关系。  相似文献   

12.
Two experiments were conducted to evaluate the nutritional quality of 2 varieties of Purdue high-digestible sorghum (PHD1 and PHD2) and a normal sorghum, compared with corn, in diets of pigs and broiler chicks. In Exp. 1, 12 pigs (average BW, 55 kg) fitted with ileal T-cannula were fed 4 diets containing 946 g of corn or sorghum (PHD1, PHD2, and normal) per kg in a 2-period crossover design (i.e., each pig received 2 diets over a 2-wk period with 6 pigs per dietary treatment) to determine apparent ileal or total tract digestibility of nutrients and energy. There was no difference in the ileal or total tract digestibility of DM, energy, P, Ca, or N among dietary treatments. In Exp. 2, a total of 192 broiler chicks were grouped by weight into 8 blocks of 4 cages each with 6 chicks per cage, and cages were assigned randomly to 1 of the 4 dietary treatments within each block. Chicks were fed corn-soybean meal (SBM) or sorghum-SBM diets for 21 d to determine apparent total tract retention and then switched to diets containing 935 g of the corresponding corn or 1 of the 3 sorghum varieties per kg for 7 d to determine apparent ileal digestibility and total tract retention. Apparent ileal digestibilities of DM and P, as well as energy, were not different in chicks fed diets containing 935 g of corn or 1 of the 3 sorghum varieties per kg. However, apparent total tract retention of DM, energy, and N in chicks fed corn was greater (P < 0.05) than those fed 1 of the 3 sorghum varieties. Although the apparent ME content of corn was greater than PHD1 and normal sorghum (P < 0.01), it was not different from PHD2 sorghum. There was no difference in apparent total tract retention of DM between chicks fed the corn-SBM and PHD-SBM diets, but it was greater (P < 0.05) in chicks fed the corn-SBM diet than those fed the normal sorghum-SBM diet. Apparent total tract retention of N in chicks fed the PHD1-SBM diet was lower (P < 0.05) than in those fed the corn-SBM diet but greater (P < 0.05) than in chicks fed the normal sorghum-SBM meal diet. No difference in the apparent ME content between the corn-SBM and PHD2-SBM diets was observed, but it was greater (P < 0.05) for the corn-SBM diet than the PHD1- or normal sorghum-SBM diet. Weight gain, feed intake, and feed efficiency were not different in chicks fed the corn-SBM or sorghum-SBM diets. Sorghum could serve as a substitute for corn in cereal grain-SBM diets for pigs and broiler chicks.  相似文献   

13.
试验旨在研究酵母硒及维生素E单独或者联合添加对苏禽3号肉鸡生长性能、肌肉品质、抗氧化能力及基因表达的影响。试验选择体重相近的苏禽3号肉鸡240只,随机分为4组,每组60只。分别为对照组、350μg/kg酵母硒添加组(试验1组)、50 mg/kg维生素E添加组(试验2组)、350μg/kg酵母硒+50 mg/kg维生素E组(试验3组),试验期84 d。结果显示:添加维生素E和酵母硒可显著降低试验期死亡率,显著提高生长性能(P<0.05)和屠宰率(P<0.05);显著降低胸肌肉系水力(P<0.05)和肌肉剪切力(P<0.05);显著提高血液SOD、T-AOC活性,降低MDA含量(P<0.05);上调胸肌和腿肌中MyoD、MSTN、Pax7基因表达。研究表明:日粮中联合添加酵母硒和维生素E可以提高肉鸡生长性能,改善肌肉品质,增强肌肉抗氧化能力。  相似文献   

14.
The objective of this study was to evaluate the effects of inorganic phosphorus source and phytase addition on performance, nutrient digestibility and bone mineralization in broiler chickens. In Exp. 1, 150 two-day old, male broiler chicks were fed a corn-soybean meal basal diet supplemented with phosphorus provided by dicalcium phosphate, tricalcium phosphate or defluorinated rock phosphate. Five cages containing 10 birds were allotted to each of the three treatments. In Exp. 2, 120 three-day old, male broiler chicks were fed the basal diet from Exp. 1 supplemented with 0, 250, 500, or 1,000 FTU phytase per kg of diet. Six cages containing five chicks were allotted to each of the four treatments. In Exp. 1, there was no difference in weight gain, feed intake or feed conversion as a result of feeding the different sources of inorganic phosphorus. The digestibility of phosphorus was significantly lower (P = 0.01) for chicks fed diets supplemented with tricalcium phosphate than for chicks fed the other two diets.  However, despite the lower digestibility, serum phosphorus levels did not differ among the three treatments. For Exp. 2, feed conversion showed a linear improvement (P = 0.03) with increasing levels of phytase inclusion (days 0 to 33).  Phytase supplementation resulted in linear increases in the digestibility of dry matter (P = 0.02), crude protein (P = 0.04) and energy (P < 0.01).  Chicks fed 1,000 FTU/kg phytase had significantly higher bone calcium (P = 0.05) and bone breaking strength (P = 0.04) than chicks fed the basal diet on day 33. In conclusion, the results of the current study indicated that the performance of birds fed diets supplemented with dicalcium phosphate, tricalcium phosphate or defluorinated phosphate was similar and therefore production costs could be lowered by choosing the cheapest inorganic phosphorus source when formulating diets for poultry. When diets were formulated to meet dietary phosphorus requirements, the growth of broilers was not enhanced with phytase supplementation.  However, increases in feed conversion and bone breaking strength and its potential to impact culling and mortality in broiler operations may be sufficient justification for the routine inclusion of phytase in diets fed to broilers.  相似文献   

15.
Excessive lipid peroxidation negatively affects the physiological response and meat quality of chickens. Delaying post‐hatch feeding was previously found to increase lipid peroxidation in the skeletal muscle of finishing broiler chickens. The aims of this study were to investigate the effects of delayed post‐hatch feeding on lipid peroxidation and the mRNA expressions of antioxidant enzymes in the pectoralis major muscle of broiler chicks during the post‐hatching period. Newly hatched chicks either had immediate free access to feed (freely‐fed chicks) or had no access to feed from 0 to 2 days old (delayed‐fed chicks), after which both groups were fed ad libitum until 4 or 13 days old. The lipid peroxidation level was higher in the delayed‐fed than freely‐fed chicks at 2, 4, and 13 days old. At 2 days old, the mRNA expressions of Cu/Zn‐SOD, Mn‐SOD, and GPX7 were lower in the delayed‐fed than freely‐fed chicks, while catalase mRNA levels did not differ. Furthermore, at 4 and 13 days old, lower mRNA expressions of Cu/Zn‐SOD and Mn‐SOD were observed in the delayed‐fed than freely‐fed chicks. These results suggest that delaying post‐hatch feeding reduces the mRNA levels of Cu/Zn‐SOD and Mn‐SOD, consequently affecting muscle lipid peroxidation in chicks during subsequent growth.  相似文献   

16.
Two experiments, involving 23 treatments, were conducted with broiler chicks in order to evaluate the utilisation of soft phosphate and calcium phosphate in practical corn‐soybean diets with and without added fish meal. Two levels of fish meal (3 and 6%) were evaluated. Comparable phosphorus and calcium levels were formulated in each of the three basal diets. Phosphorus supplementation was reduced to compensate for the phosphorus content of the fish meal.

There was no improvement in body weight when 3% fish meal was added to the diet, but with 6% added fish meal an increase in body weight was obtained as compared with chicks fed on diets containing o and 3% fish meal. Calcium phosphate‐supplemented diets gave better results than soft phosphate diets when fed with the o or the 3% fish meal diet. There was no difference in the performance of the chicks fed two inorganic phosphorus sources in the 6% fish meal diet. Maximum performance was obtained with soft phosphate in combination with 6% fish meal. Maximum performance was also obtained with soft phosphate when the phosphorus in fish meal was substituted with an equal amount from calcium phosphate. The level of fish meal in the diet did not effect bone ash of birds fed on calcium phosphate‐supplemented diets when ratios were comparable.

The addition of fish meal to the diet gave no increased advantages that could not be obtained when calcium phosphate supplied a comparable amount of phosphorus.  相似文献   


17.
This study was performed to investigate the effect of dietary supplementation with Aloe vera (AV) powder and synbiotic as growth promoter agents on performance, gut morphology, immune responses, hematology and serum biochemistry in broilers. A total of 240‐day‐old male broiler chicks (Ross 308) were randomly assigned to six treatments with four replicates. Birds were offered either a corn‐soybean meal basal diet (control) or the basal diet supplemented with 200 mg/kg virginiamycin (VM), 1 g/kg synbiotic (Syn), 2.5 g/kg AV (AV1), 5.0 g/kg AV (AV2) or 7.5 g/kg AV (AV3). Chickens fed any of the diets, except diet AV1, exhibited better feed conversion ratios at the 14–28 day period and higher average daily gain and duodenal villus height/crypt depth ratio at 42 days than those fed the control diet. Synbiotic supplementation caused a marked increase in the serum antibody titer against infectious bursal disease and infectious bronchitis vaccines. Feeding diet AV3 significantly increased red blood cell count and hemoglobin concentration, and decreased serum triglyceride level compared to the control group. The results suggested that dietary inclusion of 5 and 7.5 g/kg AV, similar with synbiotic supplementation, can be applied as effective alternatives to in‐feed antibiotics for broiler diets.  相似文献   

18.
饲粮添加共轭亚油酸对肉仔鸡肠道黏膜免疫反应的影响   总被引：1，自引：0，他引：1  
本试验旨在研究饲粮添加共轭亚油酸(conjugated linoleic acid,CLA)对肉仔鸡肠道黏膜免疫反应的影响。试验选用72只1日龄健康、体重相近的爱拔益加(AA)雄性肉仔鸡,随机分配到对照组和CLA组,分别饲喂基础饲粮和在基础饲粮中添加1%CLA的饲粮,每组6个重复,每个重复6只鸡。21日龄屠宰取样。结果表明:CLA组肉仔鸡空肠食糜分泌型免疫球蛋白A(secretory immunoglobulin A,SIgA)含量(P<0.01)和空肠SIgA基因mRNA表达水平(P<0.01)均高于对照组;饲粮添加CLA显著提高肉仔鸡空肠过氧化物酶体增殖物激活受体γ(PPARγ)基因mRNA表达水平(P<0.01),但转化生长因子β4(transforming growth factor-β4,TGFβ4)基因mRNA表达水平在2组之间没有显著差异(P>0.05);CLA组肉仔鸡Peyer氏结CD8+T细胞亚群百分数(P<0.01)和淋巴细胞转化率(P<0.05)均显著高于对照组。由此可见,饲粮添加1%CLA提高了21日龄肉仔鸡空肠SIgA水平,激活PPARγ可能是CLA调节SIgA表达的途径之一。饲粮添加1%CLA影响21日龄肉仔鸡空肠黏膜细胞免疫功能。  相似文献   

19.
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20.
This experiment was conducted to assess nutritional potential of corn steep liquor (CSL) as an alternative protein source in broiler's diet. A total of 280‐day‐old unsexed broiler chicks were randomly distributed into four experimental groups in a simple randomised experimental design (each group had seven replicates; 10 birds per each). Four iso‐nitrogenous and iso‐caloric broiler starter and finisher diets (C, LCSL, MCSL and HCSL) were formulated containing 0%, 5%, 10% and 15% CSL respectively. Results revealed that chicks fed MCSL diet had significantly (p ≤ .05) the heaviest Body weight, highest Body weight gain and the lowest feed conversion ratio followed by those fed HCSL diet. In the starter period, LCSL and MCSL diets resulted in better (p ≤ .05) dry matter (DM) (89.57%) and crude protein (67.67%) digestibilities respectively. In the finisher period, DM, crude fibre and fat digestibilities were not affected by CSL inclusion levels; while crude protein digestibility was significantly (p ≤ .05) high in the groups fed LCSL and HCSL diets. The CSL inclusion had no effect on blood haematology except serum uric acid, which tended to increase with increasing CSL levels. No microscopic changes were exhibited on liver, heart, kidneys and intestine of birds across all dietary treatments. However, crops in birds fed HCSL diet showed moderate to severe hypertrophy and hyperplasia of the mucosal lining. The study showed that CSL could be added up to 15% in broiler's diet without any adverse effect on bird's performance.  相似文献   

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