首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 46 毫秒
1.
试验旨在探明耐镉乳酸菌对蛋鸡的脏器系数、镉在蛋鸡组织及鸡蛋中的残留及钙、铁、锌、锰、铜和硒在组织和鸡蛋中沉积的影响。试验分为5组：对照组,饲喂基础日粮;镉组,基础日粮+5 mg/kg镉（以氯化镉的形式添加）;乳酸菌组,基础日粮+1×1010 CFU/kg耐镉乳酸菌;镉+低剂量乳酸菌组,基础日粮+5 mg/kg镉+1×1010 CFU/kg耐镉乳酸菌;镉+高剂量乳酸菌组,基础日粮+5 mg/kg镉+1×1011 CFU/kg耐镉乳酸菌,试验期6周。试验期末,采集各组蛋鸡血液,测定总抗氧化力（T-AOC）和超氧化物歧化酶（SOD）活力;采集各组蛋鸡内脏组织和鸡蛋,计算脏器系数,同时测定组织和鸡蛋中镉、钙、铁、铜、锌、锰及硒元素含量。结果显示,与对照组相比,镉及乳酸菌组显著提高了蛋鸡总抗氧化能力（P<0.05）。各处理组中,镉组脾脏指数最低,镉加乳酸菌组脾脏指数显著高于镉组（P<0.05）;与对照组相比,乳酸菌组显著提高心脏指数（P<0.05）。镉组致蛋鸡肝脏和肾脏中镉残留量远高于其他组织,补加耐镉乳酸菌显著减少了心脏的镉残留量（P<0.05）。与对照组相比,镉组显著降低肾脏钙、脾脏和卵黄的锰含量（P<0.05）;与对照组相比,镉加低剂量耐镉乳酸菌显著增加肾脏锰含量、卵黄铁含量及肾脏和脾脏铜含量（P<0.05）;镉在鸡蛋中的残留量较低,与对照组相比,镉组显著降低鸡蛋铁、锰元素含量（P<0.05）,补加耐镉乳酸菌显著增加铁、锌、锰和硒元素含量（P<0.05）。结果表明,在蛋鸡日粮中添加1×1010 CFU/kg的耐镉乳酸菌,可显著提高蛋鸡血清总抗氧化力水平和蛋鸡的心脏指数,显著改善镉暴露导致的脾脏萎缩和心脏镉的残留量;同时显著增加锰、铜、铁在肾脏、脾脏及卵黄中的含量及铁、锌、锰和硒在鸡蛋中的含量。  相似文献   

2.
A total of 128 broilers were used to investigate the effect of selenium (Se) on fatty acid (FA) composition and oxidative stability of lipids in the breast muscle tissue. There were 4 replicates of 4 dietary treatments: T1 (basal diet with no added Se), T2 (T1 with 0.15 mg Se added per kg diet), T3 (T1 with 0.3 mg Se added per kg diet) and T4 (T1 with 3.0 mg Se added per kg diet). A yeast source was used for added Se. Breast muscle tissue was collected from two chickens per replicate pen for the determination of Se concentration by ICP-MS, FA profile by GC and lipid oxidation using thiobarbituric acid reactive substances method. Addition of supranutritional Se levels to chicken diets leads to the production of Se-enriched meat. Consumption of 100 g of breast meat from chickens fed diets supplemented with 0.15, 0.3 and 3 mg Se per kg of diet can provide 26, 41 and 220 μg of Se, respectively. Long-chain polyunsaturated fatty acids namely C20:3n-6, C20:4n-6, C20:5n-3, C22:5n-3 and C22:6n-3 increased linearly (p = 0.047, p < 0.001, p = 0.023, p = 0.003 and p = 0.002, respectively) as the Se inclusion levels in the diets increased. At slaughter, a linear decrease in lipid oxidation (p = 0.019) was observed with Se addition, possibly attributed to the antioxidant properties of Se. Addition of supranutritional Se to chicken diets, at levels well below those causing toxicity, leads to production of Se-enriched meat, protection of health-promoting long-chain FA like C20:5n-3 and C22:6n-3 and protection of meat quality from oxidation at day 1 after slaughter.  相似文献   

3.
1. The effects of supplemental dietary vitamin E and organic selenium (Se), and their combination, on improving semen quality characteristics and antioxidative status were investigated in cockerels exposed to high ambient temperature.

2. A total of 36 Egyptian local cross males, 40 weeks old, were housed individually in cages in an open-sided building (average daily temperature ranged from 33 to 36°C and relative humidity from 60 to 70%). Birds were divided randomly into 4 experimental treatments (n?=?9 each): (1) control (basal diet without any supplementation with vitamin E or Se); (2) vitamin E (basal diet +200?mg α-tocopherol acetate/kg diet); (3) Se (basal diet +0·3?mg organic Se/kg diet); and (4) vitamin E?+?Se (basal diet +200?mg α-tocopherol acetate/kg diet +0·3?mg organic Se/kg diet).

3. Under heat stress conditions, inclusion of vitamin E and/or organic Se in the diets enhanced the semen quality traits, including the spermatozoa count and motility, and reduced the percentage of dead spermatozoa.

4. A combination of 200?mg/kg vitamin E with 0·3?mg/kg organic Se reduced the thiobarbituric acid reactive substance concentration in seminal plasma samples to about 28% of the controls; and also enhanced the seminal plasma glutathione peroxidase activity by two-fold compared with controls.

5. It was concluded that dietary vitamin E in combination with organic Se has a synergistic effect in minimising lipid peroxidation and improving the antioxidative status in seminal plasma of the domestic fowl, which probably translated into enhanced spermatozoa count, motility and reduced percentage of dead spermatozoa under heat stress conditions.  相似文献   

4.
锰对种蛋受精率、孵化率及蛋中锰、铜、锌浓度的影响   总被引：6，自引：0，他引：6  
选用1日龄星杂“288”鉴别母雏540只进行试验,以探讨日粮中不同水平锰对种蛋受精率、孵化率、蛋中锰、铜、锌浓度的影响,以及蛋中锰含量与受精率、孵化率之间的关系。结果表明:受精率以日粮含锰110mg/kg为最高(77.18％),对照组最低(64.16％),但各组间无显著差异(P>0.05)。受精蛋的孵化率以日粮含锰70mg/kg组最高(94.85％),对照组最低(80.36％),二者差异极显著(P<0.01):雏鸡在一周内脱腱症的发生率:对照组为11.80％,日粮含锰30mg/kg组为636％,其它四组未发现。当日粮中含锰70mg/kg时,不仅可获得最佳孵化率,而且可有效地防止脱腱症的发生。日粮锰含量增高时,对蛋壳、蛋清、蛋黄中铜、锌的含量及蛋清、蛋壳中锰的含量无显著影响(P>0.05),但对蛋黄中锰含量有显著影响(P<0.01).蛋黄中锰含量随日粮锰含量的增高而增加,二者呈极显著的线性相关(r=0.9370).y=0.0168x+3.3062,r为相关系数,y为蛋黄中锰含量,x为日粮中锰含量),日粮添加锰可以显著增加蛋黄中锰含量,而对铜、锌无显著影响。  相似文献   

5.
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   

6.
An experiment was conducted to determine the performance, antioxidation activity, and bone mineral content in Vanaraja chickens fed diet supplemented with organic trace minerals (oTM) at reduced levels. A total of 360 day-old chicks were selected and distributed randomly into 60 battery brooder pens. A maize–soybean meal-based control diet was supplemented with inorganic trace minerals (iTM), i.e., Mn, Zn, Fe, and Cu at 50, 45, 40, and 7.5 mg/kg, respectively, and varying concentration of oTM, i.e., Zn, Mn, Cu, Fe, I, Se, and Cr at 45, 50, 7.5, 40, 2, 0.30, and 0.25 mg/kg (diet II); 33.75, 37.50, 5.63, 30.0, 1.50, 0.23, and 0.19 mg/kg (diet III); 22.5, 25.0, 3.75, 20.0, 1.0, 0.15, and 0.13 mg/kg (diet IV); 18.0, 20.0, 3.0, 16.0, 0.80, 0.12, and 0.10 mg/kg (diet V); and 13.5, 15.0, 2.25, 12.0, 0.60, 0.09, and 0.08 mg/kg (diet VI), respectively. Each diet was allotted randomly to ten replicates and fed ad libitum from 1 to 42 days of age. The body weight at 14, 28, and 42 days was not affected by reducing the supplementation of oTM concentration in the diets. Similarly, feed intake at 14 days of age was not affected but reduced significantly (P?<?0.05) in the group fed diet IV (50 % oTM) compared to that in the other groups. The higher feed conversion ratio and increased concentration of Ca, P, and trace minerals in tibia were evident in the group fed oTM-supplemented diets compared to the diet containing iTM. Activities of glutathione peroxidase and ferric reducing ability in plasma did not differ in the groups fed on lower concentration of oTM compared to those fed on diet I (control diet). Therefore, it is concluded that the dietary supplementation of trace minerals can be reduced greatly when supplemented as organic form without affecting growth and antioxidant status in Vanaraja chickens.  相似文献   

7.
22～42日龄肉鸡铜、铁、锌、锰不同用量组合的研究   总被引：1，自引：0，他引：1  
本试验旨在研究饲粮中铜、铁、锌、锰含量对22~42日龄肉鸡生长性能和粪中铜、铁、锌、锰排泄量的影响,进而对微量元素的平衡模式进行探讨。选取940只1日龄爱拔益加(AA)肉公鸡,1~21日龄统一饲喂铜、铁、锌、锰含量分别为16.96、166.66、46.01、60.26 mg/kg的玉米-豆粕型饲粮。试验选用22日龄、体况良好、体重接近的AA肉公鸡900只,随机分为15组,每组6个重复,每个重复10只鸡。对照组饲喂基础饲粮,基础饲粮中铜、铁、锌、锰含量分别为8、125、40、60 mg/kg,试验组饲喂在基础饲粮中按照均匀设计原则添加2~8 mg/kg铜、10~35 mg/kg铁、10~40 mg/kg锌、15~60 mg/kg锰组成的14种试验饲粮。测定肉鸡试验期生长性能,并于38~42日龄时采集粪样测定铜、铁、锌、锰含量。结果表明:1)饲粮铜、铁、锌、锰含量在NRC推荐量至2倍NRC推荐量范围时,对22~42日龄肉鸡的平均日增重(ADG)和料重比(F/G)无显著影响(P0.05)。2)由最优解分析得出,粪中铜排泄量最低为23.11 mg/kg时,饲粮铜、铁、锌、锰含量分别为7.15、116.28、82.82、60.95 mg/kg;铁排泄量最低为438.34 mg/kg时,饲粮铜、铁、锌、锰含量分别为14.78、116.81、38.15、63.72 mg/kg;锌排泄量最低为102.60 mg/kg时,饲粮铜、铁、锌、锰含量分别为7.69、127.40、40.70、133.26 mg/kg;锰排泄量最低为159.37 mg/kg时,饲粮铜、铁、锌、锰含量分别为11.07、136.97、46.13、59.05 mg/kg;粪中铜、铁、锌、锰总排泄量最低为218.94 mg/kg时,饲粮铜、铁、锌、锰含量分别为7.36、125.74、38.23、62.76 mg/kg。综上所述,饲粮铜、铁、锌、锰含量在NRC推荐量至2倍NRC推荐量范围时对22~42日龄肉鸡的生长性能无显著影响;粪中铜、铁、锌、锰任一元素的排泄量均受饲粮中其他微量元素添加量的影响,且针对不同元素最低排泄量存在不同的最佳组合;饲粮铜、铁、锌、锰的含量分别为7.36、125.74、38.23、62.76 mg/kg时,能够满足肉鸡微量元素需要量,同时粪中铜、铁、锌、锰总排泄量最小。  相似文献   

8.
选40只20 g左右的健康昆明种小白鼠,随机分为4组。1组饲喂基础日粮;2组在基础日粮中以硫酸铜的形式添加铜10mg/kg;3组在基础日粮中以氧化铜的形式添加铜10mg/kg;4组在基础日粮中以纳米氧化铜的形式添加铜10mg/kg。采用全收粪法,研究纳米氧化铜对小白鼠铜表观消化率的影响。结果显示,硫酸铜组、氧化铜组、纳米氧化铜组小白鼠铜的表观消化率分别为54.74%、48.30%、71.88%,纳米氧化铜组铜的表观消化率显著高于硫酸铜组（P〈0.05）,极显著高于氧化铜组（P〈0.01）。试验表明,与添加硫酸铜和氧化铜相比,日粮中添加纳米氧化铜能提高小白鼠铜的表观消化率。  相似文献   

9.
The purpose of this study was to determine the selenium (Se) requirement in kittens. Thirty-six specific-pathogen-free kittens (9.8 weeks old) were utilized in a randomized complete block design to determine the Se requirement in cats with gender and weight used as blocking criteria. Kittens were fed a low Se (0.02 mg/kg Se) torula yeast-based diet for 5 weeks (pre-test) after which an amino acid-based diet (0.027 mg Se/kg diet) was fed for 8 weeks (experimental period). Six levels of Se (0, 0.05, 0.075, 0.10, 0.20 and 0.30 mg Se/kg diet) as Na2SeO3 were added to the diet and were used to construct a response curve. Response variables included Se concentrations and Se-dependent glutathione peroxidase activities (GSHpx) in plasma and red blood cells (RBC) as well as plasma total T3 (TT3) and total T4 (TT4). No significant changes in food intake, weight gain or clinical signs of Se deficiency were noted. Estimates of the kitten's Se requirement (i.e. breakpoints) were determined for RBC and plasma GSHpx (0.12 and 0.15 mg Se/kg diet, respectively), but no definitive breakpoint was determined for plasma Se. Plasma TT3 increased linearly, whereas plasma TT4 and the ratio of TT4 : TT3 decreased in a quadratic fashion to dietary Se concentration. The requirement estimate determined in this study (0.15 mg Se/kg) for kittens is in close agreement with other species. As pet foods for cats contain a high proportion of animal protein with a Se bioavailability of 30%, it is recommended that commercial diets for cats contain 0.5 mg Se/kg DM.  相似文献   

10.
Four groups of three ram lambs were fed, in group pens, the following diets from 4 to 19 wk of age: 1) control (6 mg Cu/kg and 1 mg Mo/kg); 2) control plus 10 mg Cu/kg; 3) control plus 10 mg Mo/kg and 4) control plus 10 mg/kg of both Cu and Mo. Copper and Mo were added to the diet as copper sulfate and sodium molybdate. The main ingredients of the diets were alfalfa hay (20%), oats (20%) and corn (59%). At 19 wk, the animals were allocated randomly to individual metabolism cages and received a single oral dose of 75Se-selenomethionine. Liver Cu concentrations at slaughter (22 wk) were 77, 259, 68 and 316 mg/kg fresh weight for treatments 1 through 4. There was clinical evidence of Cu poisoning in lambs on treatment 2. Sheep given Cu supplements without additional Mo had reduced (P less than .05) levels of 75Se activity in muscle compared with control animals. This decrease in muscle 75Se in Cu-supplemented lambs was associated with a nonsignificant increase in 75Se content of other tissues and a nonsignificant increase in fecal excretion of 75Se. Apparent absorption and net retention of 75Se was 80% and 74%, respectively. Long-term ingestion of moderate levels of Cu influenced the metabolism of Se fed as selenomethionine, possibly through effects of chronic Cu toxicity on liver function.  相似文献   

11.
唐兴  支锐 《中国饲料》2021,1(8):33-36
文章旨在评估日粮用木薯粉替代玉米同时补充外源复合酶对肉鸡生长性能、组织器官重量及养分表观消化率的影响。试验选择平均初始体重（44.15±0.76）g的肉鸡576只,随机分为4组,每组4个重复,每个重复36只。试验日粮采用2×2因子设计,即2种原料（玉米和木薯）和酶添加量（0和100?mg/kg复合酶）,其中T1组和T2组分别饲喂玉米、木薯型日粮,T3和T4组分别在T1和T2基础日粮中添加100?mg/kg复合酶,试验为期3周。结果：玉米型日粮组肉鸡末重较木薯型日粮组显著提高6.65%（P＜0.05）,但料重比显著降低2.10%（P＜0.05）。无论日粮类型如何,添加复合酶较未添加组肉鸡料重比显著降低2.10%（P＜0.05）。日粮类型及复合酶对肉鸡平均日增重和料重比的影响具有显著交互作用（P＜0.05）。与T2组相比,T3组肉鸡脾脏相对重量显著提高50%（P＜0.05）。无论日粮是玉米型还是木薯型,补充100?mg/kg复合酶较未补充组淀粉表观消化系数显著提高5.59%（P＜0.05）。结论：在本研究条件下,日粮中添加50%木薯粉完全替代玉米同时补充100?mg/kg复合酶可以改善肉鸡饲料效率,提高淀粉表观消化率。 [关键词]木薯|复合酶|肉鸡|生长性能|养分消化  相似文献   

12.
This study examined the effects of excessive dietary supplementation with organic selenium on phagocytic activity and antioxidative status of chickens for fattening fed diet contaminated with deoxynivalenol (DON). Sixty chickens of Ross 308 hybrids were at day of hatching divided into four groups with 15 birds in each. The background DON dietary levels in both negative and positive control groups were 0.2 mg/kg. The complete feed for positive control group was supplemented with Se dose 1 mg/kg in the form of Se-yeast. Group 3 was fed diet with DON level 3 mg/kg while diet for group 4 combined DON level 3 mg/kg with a excessive supplement of Se-yeast (Se dose 1 mg/kg). After 6 weeks of dietary intake, six randomly-chosen chickens from each group were sampled. Feeding of contaminated diet resulted in significantly reduced blood phagocytic activity (19.5 ± 1.1% in the negative control vs. 12.8 ± 0.8% in the DON-treated group, p < 0.05). Se-yeast supplemented to the DON contaminated diet prevented suppression of phagocytic activity. Dietary intake of DON at levels 3 mg/kg did not influence the plasma α-tocopherol level while excessive dietary Se dose reduced it in both Se supplemented groups. Neither the birds of DON-treated group nor the birds from group 4 with DON and Se-yeast showed any response in plasma γ-glutamyltransferase (GGT) activity. Subtoxic dietary level of DON significantly increased the activity of glutathione peroxidase (GPx) in the duodenal mucosa, while additional Se supplementation prevented such a response to mycotoxin. On the other hand, both Se supplemented groups showed significantly elevated GPx activities in blood, liver and kidney, (p < 0.05). The results suggest a potential ability of excessive supplementation of organic selenium to prevent the blood phagocytic activity suppression and changes in GPx activity in duodenal tissue induced in broilers by subtoxic dietary levels of DON.  相似文献   

13.
150只1日龄雏鸡随机分成5组，第1－4组为加硒试验组，第5组为不加硒对照组。全部鸡饲喂全价饲料（含硒0.18mg/kg），并以饮水方式进行新城疫第一次免疫和第二次免疫，其中第1－4组分别于两次免疫前连续3d以饮水方式给予亚硒酸钠，剂量分别0.25、0.50、0.75及1.0mg/kg。试验结果表明：各组平均血清硒含量变化与给硒剂量相一致；第3组、第4组雏鸡的增重显著或极显著地高于第5组（P＜0.05或＜0.01）；各加硒试验组红细胞免疫粘附功能均较不加硒对照组为高，其中以第3组最为明显。  相似文献   

14.
1. A study was conducted to estimate the effect of copper (Cu) supplementation on growth performance and biochemical profiles of blood and meat in broiler chickens.

2. A total of 240?d-old broiler chicks (Vencobb-100) were randomly divided into 12 groups, each of 20 chicks (4 treatments?×?3 replicates).

3. The basal diet (T1) contained 215?g?kg?1 crude protein (CP), 12·76?MJ?kg?1 ME, 32?g?kg?1 total calcium and 5?g?kg?1 total phosphorus. T2, T3 and T4 were formulated to contain an additional 75, 150 and 250?mg?Cu?kg?1 diet, respectively. Copper sulphate pentahydrate (CuSO4, 5H2O) was used as the source of Cu.

4. Significant reductions in plasma total cholesterol and triglyceride, and an elevated concentration of HDL-cholesterol, were observed in the chickens fed with 250?mg?Cu?kg?1 (T4) of feed at the 3rd and 6th week of the experiment. Total cholesterol in meat decreased significantly in the birds fed with dietary Cu at 250?mg?kg?1 (T4) of feed.

5. Growth performance was measured in terms of live weight gain, cumulative feed intake and feed conversion ratio at the end of d 21 and d 42 of the experiment, and the result was found to be commercially beneficial for the chickens receiving 150?mg?Cu?kg?1 (T3) of diet. The concentration of Cu in breast muscle and liver increased significantly at the end of experiment.

6. From this study it can be concluded that supplementation with dietary Cu may be beneficial for production performance and plasma biochemical characteristics of broiler chickens.  相似文献   


15.
1. Rice bran lysolecithin (RBL) was evaluated in broiler chicken diets. In the first experiment, RBL was included in diet at 0, 0·5, 2, 8 and 32?g/kg and fed to 250 broiler chickens from 0 to 42?d of age. In the second experiment, RBL was fed at 0, 25 and 50?g/kg diet to 405?day-old broiler chickens until 21?d of age, while during the finisher phase (22–35?d of age) chickens receiving each concentration of RBL were given all three concentrations of RBL in a 3?×?3 factorial manner. The diets were isocaloric.

2. Body weight, food consumption and food conversion efficiency were unaffected by feeding RBL, while the weight of pancreas increased at ≥2?g/kg of RBL in diet (experiment 1). In experiment 2, body weight was greater in the chickens receiving RBL at either 25 or 50?g/kg (21?d) and 50?g/kg (35?d of age). At 21?d of age, food consumption was greater at 25 or 50?g RBL/kg diet, while food conversion efficiency improved with 50?g RBL/kg diet.

3. Fat digestibility increased with RBL at 32?g/kg (experiment 1) and ≤25?g/kg (experiment 2). Rice bran lysolecithin increased ready to cook weight at 50?g/kg during starter phase and decreased abdominal fat at 25 and 50?g/kg during finisher phase (experiment 2). Liver and meat fat content were not affected.

4. It is concluded that lysolecithin from rice bran oil could be used as energy supplement in broiler chicken diet.  相似文献   


16.
The ameliorating effects of Cu++ and SO4--ions on concurrent selenite toxicity were compared in two factorial experiments using 60 weanling rats each. In the first experiment, 0, 500 and 1,000 mg Cu (as CuCl2)/kg diet were fed in conjunction with 0, 5, 10 and 20 mg Se (as Na2SeO3)/kg diet. In the second experiment, the treatments were 0, 500 and 1,000 mg SO4 (as Na2SO4)/kg fed in conjunction with 0, 5, 10 and 20 mg Se/kg diet. A paired-feeding experiment using 10, 15 and 20 mg Se/kg diet was also conducted with 28 rats to compare the influence of inanition in control and selenite-fed rats. Cupric++ ion, but not SO4--ion, prevented mortality among selenite-intoxicated rats. There were significant Cu X Se interaction effects on feed intake, daily gain, packed cell volume (PCV), serum Cu and Fe, sperm counts, and weights of liver, kidney and testis. There were main effects of Cu and Se on serum Se and liver Cu. In Exp. 2 there were significant SO4 X Se interaction effects on feed intake, daily gain, serum Cu and testis weight. There were main effects of Se on PCV, sperm count, serum testosterone, liver Se, liver Cu and the absolute weights of liver and kidney. The only main effect of SO4 was that of increased liver Cu concentrations. Among the pair-fed rats, the selenite-fed rats, with one exception, died before their paired rats.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

17.
纳米氧化铜对小白鼠血浆抗氧化机能的影响   总被引：2，自引：0，他引：2  
选144只20g左右的健康昆明种小白鼠,随机分为6组,每组设4个重复。1组饲喂基础日粮;2组在基础日粮中以硫酸铜的形式添加铜10mg/kg;3组在基础日粮中以氧化铜的形式添加铜10mg/kg;4～6组在基础日粮中以纳米氧化铜的形式分别添加铜5、10、20mg/kg。研究不同剂量纳米氧化铜对小白鼠血浆抗氧化能力的影响,试验期30d。结果表明,添加纳米氧化铜显著提高小白鼠血浆铜蓝蛋白活力(P<0.05),显著提高小白鼠血浆细胞色素C氧化酶活性(P<0.05),显著降低30d小白鼠血浆丙二醛含量(P<0.05)。  相似文献   

18.
饲用左旋咪唑对肉仔鸡免疫功能调节作用的研究   总被引：5，自引：0，他引：5  
试验用刚出壳的ＡＡ 商品代肉用公雏 ３７８ 只,随机分成 ３ 组,每组 １２６ 只分成 ９ 个重复。以玉米 豆粕型日粮为基础日粮,喂给三种日粮即无药组（１ 组或对照组）、添加左咪唑（ｌｅｖａｍ ｉｓｏｌｅ,ＬＥＶ）１０（２ 组）和３０ｍ ｇ／ｋｇ 饲料（３ 组）。检测肉仔鸡每周体重、耗料量,４ 和 ６ 周龄胸腺、脾脏和法氏囊重量及其免疫器官指数,以及外周血中 Ｔ 或Ｂ淋巴细胞对不同丝裂原的反应性。结果表明：（１）在肉仔鸡日粮中添加 ３０ｍ ｇ／ｋｇ 的 ＬＥＶ 可使胸腺、脾脏和法氏囊的重量及其指数明显增加（Ｐ＜ ０．０５）;添加１０ｍ ｇ／ｋｇ 的ＬＥＶ 对免疫器官重量也有一定的促进作用,但差异并不显著（Ｐ＞ ０．０５）。试验证明ＬＥＶ 对免疫器官的生长发育有明显的促进作用。（２）４２ 日龄时３ 组肉仔鸡外周血Ｔ 淋巴细胞对丝裂原 Ｃｏｎ Ａ刺激的反应性以及 Ｂ 淋巴细胞对丝裂原 ＬＰＳ刺激的反应性明显高于对照组（Ｐ＜ ０．０５）,说明添加３０ｍ ｇ／ｋｇＬＥＶ 会增强细胞免疫和体液免疫功能。（３）随着日粮中 ＬＥＶ 添加量的增加,肉仔鸡的增重速率和饲料转化率都有相应改善,添加 ３０ｍ ｇ／ｋｇＬＥＶ 对二者的改善程度分别为 ７．３３％ 和 ５．１５％ ,?  相似文献   

19.
1. In a 42-d feeding trial, 264 one-d-old, as hatched, Cobb 400 broiler chickens (6 pens per group, n = 11 per pen in a 2?×?2 factorial arrangement) were fed on two concentrations of dietary calcium (Ca) (9.0 and 7.5 g/kg in starter, 7.5 and 6 g/kg in grower phases) and supplemental phytase (0 and 500 U/kg diet).

2. During d 0–21, the high Ca + phytase diet improved body weight. During d 0–42, feed intake was increased by the low Ca diet and decreased by phytase supplementation. Feed conversion ratio during d 0–21 was improved by the high Ca + phytase diet.

3. At d 42, Ca in duodenal digesta was reduced by low dietary Ca and supplemental phytase. High dietary Ca reduced P in duodenal and jejunal digesta. Phytase reduced digesta P and increased serum P concentration.

4. Relative tibia length decreased with low dietary Ca and increased with phytase. The robusticity index of tibia was improved by the low Ca diet and phytase supplementation. Phytase supplementation increased tibia ash and concentrations of Ca, magnesium (Mg), manganese (Mn), copper (Cu), zinc (Zn) and iron (Fe) in tibia. The low Ca diet increased Mg, Mn and Fe and reduced Cu and Zn in tibia.

5. It was concluded that 7.5 g Ca/kg during weeks 0–3 and 6 g Ca/kg during weeks 3–6 sustained broiler performance and bone ash, while phytase supplementation facilitated tibia mineralisation, particularly during the grower phase.  相似文献   

20.
1. A study was conducted to investigate the effectiveness of high dietary copper concentrations obtained from tribasic copper chloride (TBCC, 58% copper) and copper sulphate pentahydrate (CuSO4, 25% copper) in replacing antibiotic growth promoters (AGP) in duck diets.

2. A total of 960 one-day-old Cherry Valley meat-strain ducks were divided into 3 treatment groups, with 8 replicates per treatment, in a 6-week feeding trial. The ducks were fed a basal diet supplemented with AGP (40?mg zinc bacitracin/kg and 40?mg garlicin/kg of diet) or 150?mg of Cu/kg of diet, given as either CuSO4 or TBCC.

3. The body weight, average daily gain, average daily feed intake and mortality of ducks were not affected by the dietary treatments. However, the feed/gain ratio of ducks that were fed TBCC diets was significantly lower than those of ducks that were fed CuSO4 diets and were similar to those in the AGP group.

4. TBCC increased the Cu content in the liver tissue of ducks compared with the content in those that were fed the diet supplemented with AGP. TBCC also increased the Fe and Zn content in breast muscles compared with that in ducks that were fed the diet supplemented with CuSO4.

5. The activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were significantly higher in the serum of ducks that received the diet supplemented with TBCC than AGP or CuSO4. TBCC treatment decreased the malondialdehyde (MDA) content in serum of ducks compared with groups supplemented with CuSO4.

6. No significant difference was observed in liver or muscle fat content among the different dietary treatment groups. The serum low-density lipoprotein cholesterol concentration was lower in ducks fed AGP diets than those fed CuSO4 diets.

7. It was concluded that the replacement of AGP with 150?mg of Cu/kg of feed from TBCC improved the feed efficiency, trace mineral deposition and antioxidant status more than when the source of copper was CuSO4.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号