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1.
The purpose of this 42-day study was to investigate the apoptosis in the bursa of Fabricius induced by different levels of
dietary vanadium. A total of 420 1-day-old avian broilers were divided into 6 groups in which there were 7 replicates in each
group and 10 broilers in each replicate and fed on a corn–soybean basal diet as control diet (vanadium 0.073 mg/kg) or the
same diet amended to contain 5, 15, 30, 45, and 60 mg/kg vanadium supplied as ammonium metavanadate (NH 4VO 3). Ultrastructurally, mitochondrial injury and increased numbers of apoptotic cells with condensed nuclei were observed in
the 30, 45, and 60 mg/kg groups. As measured by flow cytometry, the percentages of apoptotic lymphocytes were significantly
increased in the 15-, 30-, 45-, and 60-mg/kg groups when compared with those of control group. Meanwhile, the terminal deoxynucleotidyl
transferase 2′-deoxyuridine 5′-triphosphate nick end-labeling assay showed that there were increased numbers of apoptotic
cells in the 30-, 45-, and 60-mg/kg groups. Immunohistochemical tests showed increased numbers of positive cells under Bax
and caspase-3 protein detection and decreased Bcl-2 protein in the 15-, 30-, 45-, and 60-mg/kg groups. The vanadium content
of the bursa was found to be significantly increased in the 30-, 45-, and 60-mg/kg groups. These results suggested that dietary
vanadium in excess of 15 mg/kg could cause lymphocyte apoptosis in the bursa of Fabricius and impact humoral immunity in broilers.
Lymphocyte apoptosis in the bursa induced by high levels of dietary vanadium is associated with mitochondrial injury and changes
in levels of apoptogenic proteins, such as Bcl-2, Bax, and caspase-3. 相似文献
2.
The purpose of this 42-day study was to investigate the effects of low selenium (Se) on immune function by determining cell
cycle and apoptosis of bursa of Fabricius. One hundred twenty 1-day-old avian broilers were randomly assigned to two groups
of 60 each and were fed on a low Se diet (0.0342 mg/kg Se) or a control diet (0.2 mg/kg Se), respectively. The relative weight
of bursa was significantly decreased in low Se group from 28 days of age in time-dependent manner when compared with that
of control group. Cell cycle analysis by flow cytometry showed that low Se caused an increase in G 0G 1 phase cells that corresponded to a decrease in S phase cells in bursa of Fabricius. Ultrastructurally, mitochondria injury
and increased apoptotic cells with condensed nuclei were observed. Low Se increased the percentage of Annexin V-positive cells,
as measured by flow cytometry, in comparison with that of control group. These data suggested that low Se diet restrained
the development of bursa of Fabricius by cell cycle arrest and apoptosis. 相似文献
3.
Abstract Sixty chickens were randomly divided into two groups to determine the effect of oral administration of probiotics on the intestinal mucosal immune response and ultrastructure of cecal tonsils. The first group (control) was fed with a basic diet without antibiotic or probiotics. The second group was fed with the same diet as the control, except they received drinking water with probiotics (4×10 9 cfu per chicken and day) from posthatch to day 3 of age. The probiotic preparation was composed of Bacillus subtilis Bs964 , Candida utilis BKM-Y74 and Lactobacillus acidophilus LH1F. Intestinal fluid, Peyer's Patch and cecal tonsils were taken at day 1, 4, 7, 10 and 18 after administration of probiotics. The results showed: (i) Compared to the control, probiotics enhanced the content of following items: immunglobulin (Ig)A in the intestinal fluid at day 7 ( p < 0.01), the IgG-forming cells at day 10 ( p < 0.05), IgM-forming cells in the Peyer's Patch at day 7 ( p < 0.05), IgA-forming cells at day 7–10 ( p < 0.05), IgG-forming cells at day 7 ( p < 0.05) and IgM-forming cells in cecal tonsils diffuse area at day 4–7 ( p < 0.05). (ii) T lymphocytes in cecal tonsils were enhanced at day 7 ( p < 0.01) after orally fed with probiotics. (iii) The density of microvilli and length of cecal tonsils increased after probiotics were administrated at day 3. With chicken ageing, the efficiency of probiotics would decrease. These results suggested that probiotcs enhance intestinal mucosal immunity of chicken at the early age. 相似文献
4.
The purpose of this 42-day study was to investigate the effects of dietary excess vanadium on immune function by determining
the morphological changes and cell cycle of bursa of Fabricius, and the serum Ig contents. A total of 420 one-day-old avian
broilers were divided into six groups and fed on a corn–soybean basal diet as control diet, or the same diet amended to contain
5, 15, 30, 45, and 60 ppm vanadium supplied as ammonium metavanadate. When compared with that of control group, the relative
weight of bursa was significantly increased in the 15 ppm group from 14 to 35 days of age and increased in the 5 ppm group
at 42 days of age, and significantly decreased in the 60 ppm group from 14 to 42 days of age and decreased in 30 and 45 ppm
groups from 35 to 42 days of age. Pathological lesions progressed as the dietary vanadium increased. The gross lesions of
bursa showed obvious atrophy with decreased volume and pale color in 45 and 60 ppm groups. Histopathologically, widened cortex
and increased number of lymphocytes appeared in 5 and 15 ppm groups, and reduced lymphocytes and connective tissue hyperplasia
appeared in 45 and 60 ppm groups. The bursal cells in static phase (G 0/G 1) were decreased, and those in the mitotic phase (G 2 + M) and the proliferating index (PI) were increased in 5 and 15 ppm groups. However, bursal cells in the G 0/G 1 phase were increased, and those in G 2 + M phase, synthesis phase (S) and the PI were decreased in 45 and 60 ppm groups. Also, the serum IgG and IgA contents were
increased in 5 and 15 ppm groups, and the serum IgG, IgA, and IgM contents were decreased in 45 and 60 ppm groups. These results
suggested that dietary excess vanadium (45 and 60 ppm) could inhibit growth of bursa of Fabricius and impair humoral immunity
in chicken. 相似文献
5.
To investigate the effects of dietary manganese (Mn) supplementation on iron (Fe) metabolism, a total of 480 50-week-old hens were fed the basal diet (control, 24.35 mg Mn/kg) without Mn supplementation for 6 weeks to reduce Mn storage in the body. Hens were then randomly assigned to one of three treatments, which included the control and control added with 60 or 300 mg Mn/kg diet (M-Mn or H-Mn). Duodenum, heart, liver, and tibia were collected in hens after 12-week feeding period. No significant differences were observed in egg production, feed/egg ratio, shell breaking strength, and shell thickness among different treatments. Compared with control or M-Mn, H-Mn decreased ( P?0.05) serum Fe concentration, while increased ( P?0.05) total Fe-binding capacity (TIBC). The Fe concentration decreased ( P?0.05) in duodenum, and tended to reduce ( P?0.10) in liver from control to M-Mn and to H-Mn; whereas, dietary Mn supplementation did not influence ( P?>?0.10) Fe concentration in the heart and tibia. In conjunction with reduced Fe retention, DMT1 mRNA expression decreased ( P?0.05) with dietary Mn concentration increasing in the duodenum and liver. Duodenal FPN1 mRNA level was higher ( P?0.05) in H-Mn group than that in control or M-Mn group, while hepatic FPN1 mRNA expression was lower ( P?0.05) in M-Mn or H-Mn group when compared with control. The results demonstrated that dietary Mn supplementation decreased Fe concentration in duodenum and liver of hens, which may be related to the alteration of DMT1 and FPN1 expression in these tissues. 相似文献
6.
Selenium is an essential trace element possessing immune-stimulatory properties. The purpose of this 42-day study was to investigate
the effects of excess dietary sodium selenite on immune function by determining morphological changes and apoptosis of bursa
of Fabricius. Three hundred 1-day-old Avian broilers were fed on a basic diet (0.2 ppm selenium) or the same diet amended
to contain 1, 5, 10, and 15 ppm selenium supplied as sodium selenite ( n = 60/group). Relative weight of bursa was significantly decreased in the 1, 5, 10, and 15 ppm groups at 28 days of age, when
compared with that of 0.2 ppm group. Pathological lesions were progressed with the dietary Se level increased. The gross lesions
of bursa involved obvious atrophy with decreased volume and pale color. Histopathologically, decreased number of lymphocytes
and loosely packed lymphocytes appeared in the medulla and cortex in the follicles. Ultrastructurally, mitochondria injury
and increased apoptotic cells with condensed nuclei were observed. In comparison to that of control group, excess Se (5, 10,
and 15 ppm) intake increased the percentage of Annexin V positive cells, as measured by flow cytometry. Terminal deoxynucleotidyl
transferase 2′-deoxyuridine 5′-triphosphate nick end-labeling assay showed that there were increased frequencies of apoptotic
cells in 10 and 15 ppm selenium groups. These data suggest that Se supplementation with sodium selenite should be carefully
evaluated as excess selenium (more than 5 ppm) intake could cause profound immunologic inhibition. 相似文献
7.
An experiment was conducted to investigate the bioavailability of organic manganese proteinate (Mn) relative to inorganic
Mn sulfate for broilers fed a conventional corn–soybean meal basal diet. A total of 448-day-old Arbor Acres commercial male
chicks were fed the Mn-unsupplemented basal diet (control) or basal diet supplemented with 60, 120, or 180 mg Mn/kg from each
Mn source. At 21 days of age, heart tissue was excised for testing DM, Mn concentration, manganese superoxide dismutase (MnSOD)
activity, and MnSOD mRNA level. The Mn concentration, MnSOD activity, and MnSOD mRNA level in heart tissue increased ( P < 0.01) linearly as dietary manganese concentration increased. Based on slope ratios from multiple linear regressions of
the above three indices on added Mn level, there was no significant difference ( P > 0.21) in bioavailability between Mn proteinate and Mn sulfate for broilers in this experiment. 相似文献
9.
- 1. Glutathione peroxidase activity and serum malondialdehyde of heat-stressed broilers were increased in the early period of heat exposure, and then these parameters decreased.
- 2. The lesion scores of bursa of Fabricius in heat-stressed broilers were increased and decreased in accordance with the activity of glutathione peroxidase and serum malondialdehyde.
- 3. High environmental temperature had not affected relative bursa of Fabricius weight and NDV-HI titer of heat-stressed broilers.
- 4. We concluded that heat-stressed broilers could adapt to oxidative stress, and environmental temperature set at 38±2 °C had not affected humoral immunity.
Keywords: Glutathione peroxidase activity; Malondialdehyde; NDV-HI titer; Humoral immunity; Bursa of fabricius; Oxidative stress; Lipid peroxidation; Heat-stressed broiler; Adaptation; Heat stress 相似文献
10.
A dose–response experiment was conducted to find the sensitive and consistent biomarker for the estimation of dietary manganese
(Mn) requirement and establish the optimal Mn level for broilers fed a practical corn–soybean meal diet from 1 to 21 days
of age post-hatching. A total of 480 1-day-old Arbor Acres male chicks were randomly allotted to one of eight treatments with
five replicates of 12 birds each and fed diets supplemented with 0, 20, 40, 60, 80, 100, 120, or 140 mg Mn/kg from reagent
grade Mn sulfate. Tissue Mn concentrations, manganese-containing superoxide dismutase (MnSOD) activity, and MnSOD mRNA concentration
within heart tissue were analyzed at 7, 14, and 21 days of age. Tissue Mn concentrations and heart MnSOD activity showed significant
quadratic responses, and heart MnSOD mRNA concentration showed an asymptotic response to dietary supplemental Mn level, respectively.
The estimate of dietary Mn for chicks from 1 to 21 days of age was 122–128 for heart Mn concentration, 141–159 for pancreas
Mn concentration, 127–138 for liver Mn concentration, and 135–156 mg/kg for heart MnSOD activity, respectively. Heart MnSOD
mRNA concentration was a consistent index for the estimation of the Mn requirement of broilers. Based on this index, the estimate
of dietary Mn requirement for broilers from 1 to 21 days of age post-hatching was about 130 mg/kg, which was a little more
than two times of the current NRC (1994) requirement. 相似文献
11.
The influence of zinc(II) propionate on the efficacy of Lactobacillus fermentum against Salmonella enterica serovar Düsseldorf was tested in Japanese quails. Twenty one 3-day old Japanese quails were divided into 3 groups each consisting
of 7 birds and inoculated orally: (i) group A (control) with Rogosa broth; (ii) group B with rifampicin-resistant L. fermentum (2.5 × 10 7 CFU/animal); and (iii) group C with rifampicin-resistant L. fermentum cultured in Rogosa broth supplemented with zinc(II) propionate (1 g Zn 2+ /L of broth; i.e. 2.5 × 10 7 CFU/animal and 0.1 mg Zn 2+ /animal). After 16 hours all birds were infected with a single dose of S. enterica serovar Düsseldorf (5.8 × 10 7 CFU /animal). During the next 6 days the chicks received the same inoculations as they had received earlier through the medium
of drinking water. The viable counts of Salmonella, rifampicin-resistant lactobacilli and total aerobes in the feces and cecal content, zinc concentration in the cecal content
and growth performance were evaluated. L. fermentum alone, and in combination with Zn(II) propionate significantly reduced shedding of Salmonella in the feces and also the amount of salmonellae present in cecal content as compared to control. The numbers of Salmonella in group C in all collections were lower than in group B, but a significant difference ( p < 0.05) was noted only 24 h after infection. The viable counts of rifampicin-resistant lactobacilli were similar in groups
B and C and numbers of total aerobes were reduced in these groups compared with control. L. fermentum and its combination with zinc(II) propionate increased daily weight gains in the chicks in comparison with control. Zinc
concentration in the control and C group was 34.9 ± 6.2 mg · kg −1 and 676.3 ± 106.6 mg · kg −1 of cecal content, respectively.
Presented at the Second Probiotic Conference, Košice, 15–19 September 2004, Slovakia. 相似文献
12.
Broiler salmonellosis is a major problem for poultry industry. Here, we supplemented broiler feed with 1% of ginger stems (GS) fermented with Lactobacillus paracasei and analyzed the effects on the resistance to Salmonella gallinarum. The chickens were divided into four dietary groups. The control group (C) received the basal diet, and the other chickens received the basal diet supplemented with 0.1% w/w L. paracasei ML-7 (L group), 0.1% ginger stem powder (GS group), or 0.2% fermented ginger stem (FGS group) for 21 days. The dietary groups were further split into two subgroups: one challenged with 1 × 105 CFU/mL S. gallinarum orally administered in 1 mL of saline from days 7 and 14, and one that received 1 mL of saline without bacteria. Both uninfected and S. gallinarum-infected broilers fed with fermented GS (FGS) significantly increased body weight and feed intake, and had lower mortality compared to relative control groups. Furthermore, dietary FGS decreased cecal, Salmonella spp. counts and serum IgA and IgG levels. These results indicate that FGS prevented S. gallinarum colonization and promoted weight gain in broilers, suggesting that FGS supplementation can be effectively used as a replacement of antibiotic growth promoters to prevent Salmonella infection. 相似文献
13.
A total of 180 1-day old Arbor Acres chicks was used to investigate the effects of a single L. acidophilus I 26 strain or a mixture of 12 Lactobacillus cultures on the production performance, weight of organs, and intestinal microflora and VFA of broilers. The chicks were assigned randomly into three groups with 60 chicks per treatment. The three dietary treatments were: (i) basal diet (acted as control); (ii) basal diet+1 g kg −1 L. acidophilus I 26; and (iii) basal diet+1 g kg −1 mixture of 12 Lactobacillus strains. The results showed that the addition of either a single L. acidophilus I 26 strain or a mixture of 12 Lactobacillus cultures to the basal diet increased significantly ( P<0.05) the body weight and feed:gain ratio of broilers for 0–6 weeks. Supplementing the Lactobacillus cultures, singly or in a mixture, in the diet of broilers also decreased significantly ( P<0.05) the numbers of coliforms in the cecum 10 and 20 days after feeding, increased significantly ( P<0.05) the total VFA in the ileum and cecum, and lowered the cecal pH values. However, the addition of the Lactobacillus cultures in the diets did not increase significantly the lactobacilli population in the ileum and cecum of broilers, except for 30 days after feeding. There were also no significant differences in the populations of total anaerobes, total aerobes, Bifidobacteria and Streptococcus in the ileal and cecal contents of chickens fed with or without Lactobacillus cultures. No significant differences were found in the weight of the liver, spleen, bursa, gizzard, duodenum, jeju-ileum and total small intestine of broilers given the different dietary treatments. 相似文献
14.
Lactoferrin (LF) has in vitro antimicrobial activity against Gram-negative bacteria. Salmonella enterica subsp. enterica serovar Typhimurium causes systemic infection and acute diarrhea in humans, mainly in children younger than 2 years of age.
The aim of the study was to determine the in vivo effect of bovine LF in Salmonella ser. Typhimurium infection in mice. 58 BALB/c mice were employed. Two hours before the infection with 300 μl of 10 7 CFU of Salmonella ser. Typhimurium, 29 mice received LF (2 mg) and 29 placebo (buffer). After the infection, the mice received LF (10 mg/ml)
ad libitum or buffer, respectively, for 7 days. Mortality, weight and clinical signs (piloerection, hunched position and reduced
movement) were monitored daily. The degree of inflammation and necrosis in the intestine, liver, spleen and brain were studied
with a blinded observer. The mortality in the control group (8/29) was higher than in the LF group (1/29) (Kapplan Meier P < 0.05). From the third day post-infection the control group were significantly more symptomatic ( P < 0.05). The blood culture for Salmonella spp. was positive for all mice studied in the control group (17/17), but positive in the LF group in only 6/17 animals ( P < 0.05). In the LF group, the pathologic studies show less inflammation and focal necrosis in the four organs studied, with
the greatest difference found in the intestine. Bovine LF protects against Salmonella ser. Typhimurium infection in mice, reducing the severity, mortality and the degree of inflammation of this infection. 相似文献
15.
The purpose of this study was to examine oxidative stress induced by dietary vanadium in the mucosa of different parts of
intestine including duodenum, jejunum, ileum, and cecal tonsil. A total of 420 1-day-old avian broilers were divided into
six groups and fed on a corn–soybean basal diet as control diet or the same basal diet supplemented with 5, 15, 30, 45, and
60 mg/kg vanadium as ammonium metavanadate. During the experimental period of 42 days, oxidative stress parameters were determined
for both control and experimental groups. The results showed that malondialdehyde content was significantly higher ( p < 0.05 or p < 0.01) in 30, 45, and 60 mg/kg groups than in control group. In contrast, the activities of superoxide dismutase, catalase,
and glutathione peroxidase, and ability to inhibit hydroxyl radical, and glutathione hormone content were significantly decreased
( p < 0.05 or p < 0.01) mainly in 45 and 60 mg/kg groups in comparison with those of control group. However, the abovementioned oxidative
stress parameters were not significantly changed ( p > 0.05) in 5 and 15 mg/kg groups. It was concluded that dietary vanadium in excess of 30 mg/kg could cause obvious oxidative
stress in the intestinal mucosa, which could impact the antioxidant function of intestinal tract in broilers. 相似文献
16.
Experiments were conducted to evaluate the effects of different competitive exclusion (CE) cultures on the concentration of cecal propionic acid in 3-day-old broiler chicks, and the correlation between cecal propionic acid concentration and protection against Salmonellacolonization. CE cultures that significantly ( P < 0.05) increased cecal propionic acid in 3-day-old chicks decreased ( P < 0.05) cecal Salmonellacolonization in 10-day-old chicks compared with the untreated controls. CE cultures that failed to significantly ( P > 0.05) increase cecal propionic acid concentrations in 3-day-old chicks failed to protect ( P > 0.05) against cecal Salmonellacolonization in 10-day-old chicks compared with untreated controls. A significant ( P < .05) correlation (−.88) was found between cecal propionic acid concentration in 3-day-old chicks and cecal Salmonellacolonization in 10-day-old chicks. 相似文献
17.
A strain of Bacillus subtilis (B. subtilis) BYS2 was previously isolated from Mount Tai, which is located in Tai’an City in the Shandong Province of China. The strain was then stored in the Environmental Microbiology Laboratory at Shandong Agricultural University. To evaluate the effect of the bacterium preparation in broiler production, we fed the bacterium (106 CFU/g) to 1-day-old broilers and continued this feeding for 6 weeks to analyze its effect on growth and immune performance. We found that the average weight of the bacterium-fed group increased by 17.19% at weeks 5 compared to the control group (P < 0.05). The height of the villi in the duodenum and jejunum and the ratio of villi to crypt were significantly increased in the bacterium-fed group at weeks 5 (P < 0.05). Also, the IgG in the serum of broilers in the experimental group increased by 31.60% (P < 0.05) and IgM 30.52% (P < 0.05) compared with those in the control group. The expressions of the major pattern recognition receptors (PRRs), antiviral proteins, pro-inflammatory cytokines, and β-defensins were significantly higher than those in the control group (P < 0.05). Meanwhile, the bursa immune organ indices of broilers in the experimental group were significantly higher than those in the control group (P < 0.05). Also, after 5 weeks of continuous feeding, when infected with Escherichia coli (E. coli) O1K1 and Newcastle disease virus (NDV) F48E8, the content of bacteria and virus in tissues and organs of the experimental group decreased significantly, and the survival rate of infected chickens increased by 31.1% and 17.7%, respectively (P < 0.05). These results show that the anti-infective B. subtilis BYS2 could, to some extent, replace antibiotics to promote growth, improve innate immunity, and enhance disease resistance in broilers. 相似文献
18.
Three hundred 1-day-old avian broilers were fed on a basic diet (0.2 mg/kg selenium) or the same diet amended to contain 1,
5, 10, and 15 mg/kg selenium supplied as sodium selenite ( n = 60/group). In comparison with those of 0.2 mg/kg selenium group, the percentages of annexin V-positive splenocytes were
increased in 5, 10, and 15 mg/kg selenium groups. TUNEL assay revealed that apoptotic cells with brown-stained nuclei distributed
within the red pulp and white pulp of the spleens with increased frequency of occurrence in 10 and 15 mg/kg selenium groups
in comparison with that of 0.2 mg/kg Se group. Sodium selenite-induced oxidative stress in spleens of chickens was evidenced
by decrease in glutathione peroxidase, superoxide dismutase, and catalase activities and increase in malondialdehyde contents.
The results indicate that excess dietary selenium in the range of 5–15 mg/kg of feed causes oxidative stress, which may be
mainly responsible for the increased apoptosis of splenocytes in chickens. 相似文献
19.
The purpose of this 42-day study was to investigate the effects of excess dietary selenium on immune function by determining
morphological changes of spleen and cell cycle of splenocyte. Three hundred 1-day-old avian broilers were fed on a basic diet
(0.2 mg/kg selenium) or the same diet amended to contain 1, 5, 10, and 15 mg/kg selenium (Se) supplied as sodium selenite
( n = 60/group). Anatomically, the spleens were shrinked in volume with pallecent color. Histopathologically, lymphopenia in
splenic nodules and periarterial lymphatic sheaths and congestion of the red pulp were observed in 5, 10, and 15 mg/kg Se
group. By flow cytometry method, the percentage of G 0/G 1 phase splenocytes was significantly increased, whereas the percentages of S phase and G 2+M phase splenocytes and the proliferation index were markedly decreased in 5, 10, and 15 mg/kg Se groups when compared with
those of 0.2 mg/kg group. The results confirmed that excess dietary Se as sodium selenite in the range of 5∼15 mg/kg caused
growth retardation of spleen by cell cycle blockage in young chickens. 相似文献
20.
The objectives of this study were to investigate the effects of dietary high molybdenum (Mo) on immune function by determining
changes of the subsets of peripheral blood T-cells and serum interleukin (IL)-2 contents. 300 1-day-old avian broilers were
divided into four groups and fed on a corn–soybean basal diet as control diet or the same diet amended to contain 500; 1,000;
and 1,500 mg/kg of Mo supplied as sodium molybdate dihydrate. In comparison with those of the control group, the percentages
of CD3 +, CD3 +CD4 + and CD3 +CD8 + were decreased in 1,000 and 1,500 mg/kg of Mo intake groups from 14 days of age to 42 days of age. Also, the serum IL-2 contents
were decreased in 1,000 and 1,500 mg/kg of Mo intake groups from 14 days of age to 42 days of age. Histopathologically, hypocellularity
appeared in the thymus in 1,000 and 1,500 mg/kg of Mo intake groups. It was concluded that dietary high-Mo (1,000 mg/kg and
1,500 mg/kg) reduced the percentages of peripheral blood T-cell subsets and serum IL-2 contents and caused thymic lesions.
The cellular immune function was finally injured in broilers. 相似文献
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