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  • 1
    In: Frontiers in Veterinary Science, Frontiers Media SA, Vol. 10 ( 2023-8-17)
    Abstract: A mixed Eimeria spp. challenge model was designed to assess the effects of challenge on broiler chicken performance, intestinal integrity, and the gut microbiome for future use to evaluate alternative strategies for controlling coccidiosis in broiler chickens. The experimental design involved broiler chickens divided into two groups: a control group (uninfected) and a positive control group, infected with Eimeria acervulina (EA), Eimeria maxima (EM), and Eimeria tenella (ET). At day-of-hatch, 240 off-sex male broiler chicks were randomized and allocated to one of two treatment groups. The treatment groups included: (1) Non-challenged (NC, n  = 5 replicate pens); and (2) challenged control (PC, n  = 7 replicate pens) with 20 chickens/pen. Pen weights were recorded at d0, d16, d31, d42, and d52 to determine average body weight (BW) and (BWG). Feed intake was measured at d16, d31, d42, and d52 to calculate feed conversion ratio (FCR). Four diet phases included a starter d0–16, grower d16–31, finisher d31–42, and withdrawal d42–52 diet. At d18, chickens were orally challenged with 200 EA, 3,000 EM, and 500 ET sporulated oocysts/chicken. At d24 (6-day post-challenge) and d37 (19-day post-challenge), intestinal lesion scores were recorded. Additionally, at d24, FITC-d was used as a biomarker to evaluate intestinal permeability and ileal tissue sections were collected for histopathology and gene expression of tight junction proteins. Ileal and cecal contents were also collected to assess the impact of challenge on the microbiome. BWG and FCR from d16–31 was significantly ( p   & lt; 0.05) reduced in PC compared to NC. At d24, intestinal lesion scores were markedly higher in the PC compared to the NC. Intestinal permeability was significantly increased in the PC group based on serum FITC-d levels. Cadherin 1 (CDH1), calprotectin (CALPR), and connexin 45 (Cx45) expression was also upregulated in the ileum of the PC group at d24 (6-day post-challenge) while villin 1 (VIL1) was downregulated in the ileum of the PC group. Additionally, Clostridium perfringens (ASV1) was enriched in the cecal content of the PC group. This model could be used to assess the effect of alternative coccidiosis control methods during the post-challenge with EA, EM, and ET.
    Type of Medium: Online Resource
    ISSN: 2297-1769
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2834243-4
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  • 2
    In: Insects, MDPI AG, Vol. 14, No. 4 ( 2023-03-24), p. 312-
    Abstract: The research aims to investigate the mortality effect of essential oil from Piper cordoncillo var. apazoteanum, an endemic plant from Campeche, Mexico, on early second-instar Aedes aegypti larvae; it also aims to identify the volatile compounds present in the fresh leaves of the plant. To test the effectiveness of the essential oil, we followed World Health Organization Standard Procedures. Larvae were observed for 17 consecutive days after treatment to determine the mortality and growth-inhibitory effect exerted by the essential oil. The results showed that the essential oil was effective in controlling mosquito populations. At a concentration of 800 ppm, the oil achieved an effectiveness rate of 70.00 ± 8.16% after 24 h, increasing to 100.00 ± 0.01% mortality after 72 h. With a concentration of 400 ppm, the effectiveness was 98.33 ± 0.17% by the end of the experiment. Furthermore, the obtained results demonstrated that the LC50 value was 61.84 ± 6.79 ppm, while the LC90 value was 167.20 ± 11.49 ppm. Essential oil concentrations inhibited the growth of immature insect stages, with concentrations between 800–100 ppm demonstrating very high inhibitory activity, and the lowest concentration of 50 ppm showing high inhibitory activity. The study also identified 24 chemical compounds representing 86.71% of the volatile compound composition of the fresh leaves of P. cordoncillo; the most abundant compounds were Safrole, Caryophyllene oxide, E-Nerolidol, and Calarene epoxide. The method used to extract the volatile compounds, solvent-free microwave extraction (SFME), is a promising alternative to traditional methods that avoids the use of potentially harmful solvents, making it more ecologically friendly and potentially safer for professionals handling the extracted compounds. Overall, the study demonstrates the potential of P. cordoncillo essential oil as an effective means of controlling mosquito populations, and provides valuable information on the chemical composition of the plant.Moreover, our study is the first to report on the biological activity and chemical composition of P. cordoncillo worldwide.
    Type of Medium: Online Resource
    ISSN: 2075-4450
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2662247-6
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  • 3
    In: Frontiers in Veterinary Science, Frontiers Media SA, Vol. 10 ( 2023-10-10)
    Abstract: This study aims to evaluate the efficacy of humic acid (HA) from worm compost as an adsorbent for aflatoxin B 1 (AFB 1 ) in turkey poults. The experiment involved the inclusion of 0.25% (w/w) HA in the diet of turkey poults consuming aflatoxin-contaminated feed (250 ng AFB 1 /g). A total of 350 1-day-old female Nicholas-700 turkey poults were randomly allocated to five equal groups: negative control (basal diet); positive control (basal diet + 250 ng AFB 1 /g; HA (basal diet + 0.25% HA); HA + AFB 1 (basal diet + HA + 250 ng AFB 1 /g); and zeolite + AFB 1 (basal diet + 0.25% zeolite + 250 ng AFB 1 /g). Each group had seven replicates of 10 poults ( n = 70). The impact of HA addition was evaluated in terms of performance parameters, relative organ weights, liver histological lesions, and serum biochemical and hematological constituents. In general, the addition of HA improved body weight (BW), body weight gain (BWG), and feed conversion rate (FCR). Furthermore, HA effectively mitigated the toxic effects caused by AFB 1 in the majority of the analyzed variables. The results indicated that HA effectively counteracted the AFB 1 -induced toxic effects in turkey poults. Based on these findings, it can be concluded that HA is capable of removing AFB 1 from the contaminated diet.
    Type of Medium: Online Resource
    ISSN: 2297-1769
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2834243-4
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  • 4
    In: German Journal of Veterinary Research, German Multidisciplinary Publishing Center, Vol. 3, No. 3 ( 2023-10), p. 27-33
    Abstract: This study investigates the effects of Aspergillus meal prebiotic on a spectrum of parameters, including productive performance, bone mineralization, and intestinal integrity, in broiler chickens. Day-of-hatch Cobb 500 by-product male chicks (320 total) were randomly assigned to two experimental groups (G1 and G2) in floor pens (150×300 cm), each pen containing separate feeders and watering systems (8 replicates per treatment, 20 birds/pen). Chickens kept in G1 (control) were fed a basal diet, while those of G2 (treated) were fed a basal diet supplemented with 0.2% PRI-A-FERM. Performance parameters, including body weight (BW), body weight gain (BWG), feed intake (FI), and feed conversion ratio (FCR), were evaluated weekly from the 7th day to the end of the trial at 42 d. Fluorescein isothiocyanate-dextran (FITC-d) was administered via oral gavage to 3 chickens/replicate (n = 24), and blood was collected on 21d and on 42d to determine serum concentration of FITC-d as a biomarker to evaluate intestinal permeability and peptide YY as an indirect biomarker to evaluate short chain fatty acids. Chickens that received the \textit{Aspergillus} meal prebiotic showed a significant increase in BW, BWG, and FI on days 14, 21, 28, 35, and 42 (P 〈 0.05) and a significant reduction in FCR on days 28, 35, and 42 of evaluation compared to control. Moreover, chickens that were supplemented with the Aspergillus meal prebiotic showed a significant reduction in serum concentrations of FITC-d on both days of evaluation, as well as a significant increase in serum concentration of peptide YY. Additionally, treated animals significantly increased bone strength, total bone ash, and calcium and phosphorous content at both evaluation times compared to the control. In summary, the results of this study suggest that Aspergillus meal prebiotic supplementation can positively influence productive parameters, bone mineralization, and intestinal integrity in broiler chickens. The observed improvements underscore the importance of gut health in overall poultry performance. The findings contribute to the growing body of knowledge on the benefits of prebiotics (0.2%, PRI-A-FERM) in animal nutrition and highlight the potential for their practical application in enhancing poultry production systems. Further research is warranted to elucidate the underlying mechanisms and optimize prebiotic utilization for improved broiler health and productivity
    Type of Medium: Online Resource
    ISSN: 2703-1322
    URL: Issue
    URL: Issue
    Language: English
    Publisher: German Multidisciplinary Publishing Center
    Publication Date: 2023
    detail.hit.zdb_id: 3051621-3
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  • 5
    In: Frontiers in Veterinary Science, Frontiers Media SA, Vol. 10 ( 2023-7-11)
    Abstract: Coccidiosis caused by the Eimeria spp., an Apicomplexan protozoon, is a major intestinal disease that affects the poultry industry. Although most cases of coccidiosis are subclinical, Eimeria infections impair bird health and decrease overall performance, which can result in compromised welfare and major economic losses. Viable sporulated Eimeria oocysts are required for challenge studies and live coccidiosis vaccines. Potassium dichromate (PDC) is typically used as a preservative for these stocks during storage. Although effective and inexpensive, PDC is also toxic and carcinogenic. Chlorhexidine (CHX) salts may be a possible alternative, as this is a widely used disinfectant with less toxicity and no known carcinogenic associations Methods In vitro testing of CHX gluconate and CHX digluconate exhibited comparable oocyst integrity and viability maintenance with equivalent bacteriostatic and bactericidal activity to PDC. Subsequent use of CHX gluconate or digluconate-preserved Eimeria oocysts, cold-stored at 4°C for 5 months, as the inoculum also resulted in similar oocyst shedding and recovery rates when compared to PDC-preserved oocysts. Results and discussion These data show that using 0.20% CHX gluconate could be a suitable replacement for PDC. Additionally, autofluorescence was used as a method to evaluate oocyst viability. Administration of artificially aged oocysts exhibiting & gt;99% autofluorescence from each preserved treatment resulted in no oocyst output for CHX salt groups.
    Type of Medium: Online Resource
    ISSN: 2297-1769
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2834243-4
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  • 6
    In: Frontiers in Physiology, Frontiers Media SA, Vol. 14 ( 2023-5-30)
    Abstract: Essential oils (EO) affect performance, intestinal integrity, bone mineralization, and meat quality in broiler chickens subjected to cyclic heat stress (HS). Day-of-hatch Cobb 500 male broiler chicks ( n = 475) were randomly divided into four groups. Group 1: No heat stress (Thermoneutral) + control diets with no antibiotics; Group 2: heat stress control + control diets; Group 3: heat stress + control diets supplemented with thymol chemotype (45 ppm) and herbal betaine (150 ppm) formulation EO1; Group 4: heat stress + control diets supplemented with phellandrene (45 ppm) and herbal betaine (150 ppm) formulation EO2. From day 10–42, the heat stress groups were exposed to cyclic HS at 35°C for 12 h (8:00–20:00). BW, BWG, FI, and FCRc were measured at d 0, 10, 28, and 42. Chickens were orally gavaged with FITC-d on days 10 (before heat stress) and 42. Morphometric analysis of duodenum and ileum samples and bone mineralization of tibias were done. Meat quality was assessed on day 43 with ten chickens per pen per treatment. Heat stress reduced BW by day 28 ( p & lt; 0.05) compared to thermoneutral chickens. At the end of the trial, chickens that received both formulations of EO1 and EO2 had significantly higher BW than HS control chickens. A similar trend was observed for BWG. FCRc was impaired by EO2 supplementation. There was a significant increase in total mortality in EO2 compared with EO1 EO1 chickens had lower FITC-d concentrations at day 42 than the HS control. In addition, EO1 treatment is not statistically different if compared to EO2 and thermoneutral. Control HS broilers had significantly lower tibia breaking strength and total ash at day 42 than heat-stressed chickens supplemented with EO1 and EO2. Heat stress affected intestinal morphology more than thermoneutral chickens. EO1 and EO2 improved intestinal morphology in heat-stressed chickens. Woody breast and white striping were more common in thermoneutral chickens than heat stress chickens. In conclusion, the EO-containing diet could improve broiler chicken growth during cyclic heat stress, becoming increasingly relevant in antibiotic-free production in harsh climates.
    Type of Medium: Online Resource
    ISSN: 1664-042X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2564217-0
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