British Poultry Science最新文献

{"title":"Prediction of raw meat texture and myopathic severity of broiler breast meat with the wooden breast condition by hyperspectral imaging.","authors":"Q Liu, J Sun, H Zhuang, S-C Yoon, B Bowker, Y Yang, J Zhang, B Pang","doi":"10.1080/00071668.2025.2471450","DOIUrl":"https://doi.org/10.1080/00071668.2025.2471450","url":null,"abstract":"<p><p>1. This research explored the potential of hyperspectral imaging (HSI) to predict meat texture and the wooden breast (WB) condition in raw chicken breast fillets, categorised as normal, moderate WB and severe WB. The Meullenet-Owens Razor Shear (MORS) measurement was employed to characterise raw meat texture traits, including force, energy and peak count.2. Significant differences in MORS force, energy and peak count were observed between normal and severe WB fillets. However, no significant differences in these traits were found between normal and moderate WB fillets.3. Partial least square regression (PLSR) models, using the full wavelength range of visible and near-infrared (Vis-NIR) spectra, successfully predicted meat texture traits, with MORS peak counts exhibiting the highest predictive ability (Rp = 0.915 and RMSEp = 2.26). Key wavelengths were identified using the regression coefficient (RC) method, highlighting their significance in characterising meat texture.4. A linear discriminant analysis (LDA) model, incorporating all key wavelengths, achieved accurate predictions of WB severity, with 84.72% in the calibration set and 77.78% in the prediction set. This model demonstrated the potential of HSI in distinguishing WB fillets from normal ones, with an accuracy of 97.22%in the calibration set and 91.67% in the prediction set. Distribution maps generated using key wavelengths visually depicted variations in meat texture traits and WB severity.5. This study underscored the efficacy of HSI technology in predicting meat texture and WB severity in raw chicken breast fillets.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-7"},"PeriodicalIF":1.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143691301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<i>In vivo</i> estimation of chicken breast and thigh muscle weights using multi-atlas-based elastic registration on computed tomography images.","authors":"Á Csóka, S E Simon, T P Farkas, S Szász, Z Sütő, Ö Petneházy, G Kovács, I Repa, T Donkó","doi":"10.1080/00071668.2025.2472903","DOIUrl":"https://doi.org/10.1080/00071668.2025.2472903","url":null,"abstract":"<p><p>1. This study employed an automated estimation method for quantitatively assessing valuable meat parts in broiler chickens. This involved the segmentation of computed tomography (CT) images through elastic registration, utilising feature and model selection.2. Sixty Tetra HB colour broiler chickens (30 males and 30 females) were randomly selected and examined by CT at 10 weeks of age (live weight: 2560 ± 400 g). The animals were slaughtered, and their breast and thigh muscles were dissected and weighed (thigh and breast weights were 90 ± 19 g and 337 ± 58 g). Multi-atlas registration was used for segmentation, followed by feature extraction (256 features/individual) from the CT images.3. Four different regression analysis techniques (linear, PLS, lasso and ridge) with and without feature selection were applied to the collected data with k-fold cross-validation for estimating the thigh and breast muscle weights. The feature selection produced significantly better results in all cases.4. Among the analysis techniques, lasso and ridge regression performed the best for both muscle groups (thigh and breast muscles). These were as follows: lasso for breast: r² = 0.993, RMSE = 4.87 g; ridge for breast: r² = 0.995, RMSE = 4.03 g; lasso for thigh: r² = 0.976, RMSE = 2.94 g; and ridge for thigh: r² = 0.965, RMSE = 3.53 g.5. The results demonstrated the effectiveness of the automated method, initially tested on rabbits, in accurately estimating valuable meat parts of broiler chickens. The robust performance of the selected regression models underscores the potential for widespread application in poultry production, offering a reliable and efficient means of quantitative assessment.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-7"},"PeriodicalIF":1.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143673381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of high-level ghrelin on intestinal epithelial cell proliferation, nutrient transport and intestinal mucosal immune barrier in chickens.","authors":"Z-Y Xu, Y Yu, S-X Fu, J-Y Ma, B-B Li","doi":"10.1080/00071668.2025.2456582","DOIUrl":"https://doi.org/10.1080/00071668.2025.2456582","url":null,"abstract":"<p><p>1. Chicken ghrelin (GH) plays an important role in regulating growth hormone secretion, immunity and gastrointestinal motility. This study utilised haematoxylin-eosin staining, quantitative reverse transcription PCR and western blotting to examine the effects of high-level ghrelin on the proliferation of small intestinal epithelial cells, intestinal nutrient transport and the mucosal immune barrier in chicks.2. Eighty, 17-d-old layer type chicks were randomly divided into two groups: control (C treated with sterile phosphate buffer) and the ghrelin-treated group (GH; intraperitoneally injected with 0.5 nM GH per 100 g body weight). At 1, 3 and 5 d post-injection, six chicks from each group were randomly selected for sampling of the duodenum and ileum.3. Administering GH reduced the expression of proliferating cell nuclear antigen protein in the duodenum and leucine-rich repeat-containing G protein-coupled receptor 5 mRNA in both the duodenum and ileum. In addition, GH affected villus height and ratio of villus height to crypt (H/C) depth in these sections and fatty acid binding protein 6 expression in the ileum. The relative mRNA levels of oligopeptide transporter 1, solute carrier family 3 member 1, solute carrier family 1 member 1 and solute carrier family 5 member 1 were decreased by GH.4. Birds treated with GH had a decrease in duodenal intraepithelial lymphocytes, Paneth cells and ileal goblet cells. There was a reduction in mucin 2 mRNA in goblet cells and lysozyme C and phospholipaseA2 mRNA in Paneth cells. Additionally, the relative mRNA levels of avian β-defensin 1 (AvBD1), AvBD6 and AvBD7 in the duodenum and ileum decreased with GH administration.5. The GH inhibited proliferation of chicken duodenal epithelial cells and decreased surface area available for intestinal villus absorption. This affected the transport of intestinal amino acids, glucose and bile acids and impaired the function of the mucosal immune barrier in both the duodenum and ileum.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-16"},"PeriodicalIF":1.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143673383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early-stage fertilised egg viability detection based on machine vision.","authors":"W Zhu, L Ma, Z Shi, Y Qiao, Q Li, B Pan, Z Feng, X Yang, J Cai, J Bai, L Sun","doi":"10.1080/00071668.2025.2470275","DOIUrl":"https://doi.org/10.1080/00071668.2025.2470275","url":null,"abstract":"<p><p>1. In the early stages of incubation, challenges arise in the intelligent recognition of multiple eggs on the incubation tray and in achieving consistent high-throughput detection. To address these issues, a method was proposed using a monochrome camera to capture transillumination images of eggs. This work examined factors affecting image consistency, such as light source intensity, imaging uniformity and egg positioning and developed a correction algorithm for non-uniform light intensity in the captured images.2. On day 0 of incubation, images of the egg tray and fertilised eggs were acquired. After applying median filtering, Laplacian sharpening and fixed-threshold segmentation, the egg regions from the images were extracted. These regions were then converted into labelled images for circular fitting, with the fitted circles contracted inward by 10 pixels to define the target egg region as the template for viability detection.3. Using these template images, egg regions from days 5 to 9 of incubation were extracted and four greyscale features derived; mean, maximum, minimum and standard deviation, and four texture features; energy, correlation, homogeneity and contrast were used as input parameters for classification models using Logistic Regression (LR), Extreme Gradient Boosting (XGBoost), Light Gradient Boosting Machine (LightGBM) and a custom Convolutional Neural Network (CNN).4. The CNN model demonstrated the best performance, achieving 99% accuracy on day 8, with Precision, Recall and F1 scores of 0.99, 1.00 and 0.99 for viable embryos, respectively. For non-viable and infertile eggs, Precision, Recall and F1 scores were 1.00, 0.95 and 0.98, respectively. The optimal detection time was determined to be day 6, with an accuracy of 95%, which was one day earlier than the optimal manual inspection time.5. These findings showed that using a monochrome camera with image processing and classification models could enable high-throughput, early-stage viability detection of fertilised eggs. This can be used as technical support for the development of automated detection systems.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-12"},"PeriodicalIF":1.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143656223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of different feeding strategies on egg production, eggshell quality, tibial mass and intestinal calcium transporter expression in laying hens.","authors":"X X He, Z M Fu, Z Yang, L R Zhu, X Wan, H Yang, Z Wang, S P Rose, V R Pirgozliev","doi":"10.1080/00071668.2025.2470237","DOIUrl":"10.1080/00071668.2025.2470237","url":null,"abstract":"<p><p>1. This study examined feeding practices that could affect the expression of intestinal calcium transporter gene, tibial mass, eggshell quality and production performance in 25-week-old Hy-Line Brown Laying Hens.2. In this study, 360 healthy 25-week-old Hy-Line Brown laying hens were divided into three treatment groups with 10 replicates of 12 hens per group. The groups were fed as follows: 1) Twice a day, 50% of the standard breeder diet was fed at 8:00 and 15:00 (CFG); 2) Two-thirds of the standard breeder diet was fed at 8:00 and 15:00 (UFG), respectively; 3) Two different diets were fed separately, 50% at 8:00 and 50% at 15:00 (SFG)3. The feed-to-egg ratios of the CFG and SFG groups were significantly higher than those of the UFG group. The eggshell weight of the UFG group was numerically reduced (<i>p</i> > 0.05) compared to the CFG and SFG groups. The papilla, barrier, effective layers and the thickness of the particular eggshell layers were different in each group. The amount of calcium (Ca) and phosphorus (P) in the bones, eggshells and excreta varied by group. According to gene expression analysis, PMCA and CaBP-28K expression in the duodenum and jejunum differed significantly4. The results suggested that segmented feeding may enhance Ca deposition in eggshells, reduce bone Ca loss and improve its utilisation efficiency. This feeding strategy results in enhanced performance in layers and improves eggshell quality.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-9"},"PeriodicalIF":1.6,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143603957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of faecal microbiota transplantation supplemented with inulin on early immunity and immune organ histomorphology in chickens.","authors":"M Chen, Y Song, J Pan, S Liu, X Zheng","doi":"10.1080/00071668.2025.2458581","DOIUrl":"https://doi.org/10.1080/00071668.2025.2458581","url":null,"abstract":"<p><p>1. Faecal microbiota transplantation (FMT) is a technique that promotes gut microbiota diversity and abundance by transplantation of faeces into a recipient's gastrointestinal tract <i>via</i> multiple routes.2. Inulin, a plant polysaccharide, is a natural functional dietary fibre found in a variety of plants, including vegetables and fruits. Inulin can inhibit pathogenic bacterial growth by lowering pH, promote mineral absorption and improve intestinal barrier integrity.3. In this study 90 one-day-old chicks were randomly into three groups; control (CON) group was fed a basic diet; FMT group fed two diets containing 40 ml faecal microbial suspension; and INU group fed a diet containing 1.5% inulin and 40 ml faecal microbial suspension.4. Administering the FMT mixed with inulin effectively reduced blood levels of IL-1β, IL-4 and IL-6, promoted the growth of thymus, bursa of Fabricius and spleen. In addition, it enhanced intestinal barrier function, increased intestinal goblet cells and Paneth cells production, promoted probiotic colonisation and butyrate formation and reduced intestinal inflammation.5. In summary, inulin mixed with FMT promoted the growth of the bursa of Fabricius, thymus and spleen as well as facilitated early growth of chick by promoting intestinal health, reducing inflammation and boosting chick immunity.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-10"},"PeriodicalIF":1.6,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143603958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The apparent metabolisable energy and ileal amino digestibility of black soldier fly (<i>Hermetia illucens</i>) pre-pupae meal for broiler chickens.","authors":"A E Mahmoud, V Ravindran","doi":"10.1080/00071668.2025.2467938","DOIUrl":"https://doi.org/10.1080/00071668.2025.2467938","url":null,"abstract":"<p><p>1. The main objective of this study was to investigate black soldier fly (BSF) pre-pupae (BSFP) meal compared to soybean meal by evaluating its nutritional composition, apparent metabolisable energy (AME), apparent ileal amino acid digestibility (AID), and standardised amino acid digestibility (SID).2. Two experiments were conducted to determine the AME and AID of the BSFP for broiler chickens. Experiment 1 was an AME assay wherein broilers were fed two experimental diets (maize-soybean meal basal diet and a test diet containing 250 g/kg BSFP meal) for 7 d from d 23 post-hatch. The AME of BSFP meal was calculated based on the difference between the AME values of basal and test diets. The AME and nitrogen-corrected AME were 18.2 and 16.7 MJ/kg of dry matter, respectively. In experiment 2, the ileal amino acid (AA) digestibility of BSFP meal was determined using 30-d-old broilers by the direct method, and the ileal digesta was collected on d 34.3. The standardised ileal digestibility coefficients of Lys, Met, Thr, Val, Try, Arg and average of all AA were determined to be 0.83, 0.89, 0.82, 0.82, 0.85, 0.87 and 0.82, respectively. The findings demonstrated that the BSFP meal is a good source of energy and digestible AA and is potentially a substitute for soybean meal in broiler diets.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143572133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lack of reproducibility compromises conclusions on the effects of three <i>Bacillus</i> species on <i>Salmonella enterica</i> Enteritidis colonisation in layer-type chickens.","authors":"I Thøfner, M Olsen, L L Poulsen","doi":"10.1080/00071668.2025.2467948","DOIUrl":"https://doi.org/10.1080/00071668.2025.2467948","url":null,"abstract":"<p><p>1. <i>Salmonella</i> spp. are one of the most important foodborne zoonotic pathogens, often transmitted to humans through table eggs and fresh meat. Strategies for the prevention and reduction of <i>Salmonella</i> spp. in poultry include various approaches, such as biosecurity measures, vaccination and the use of feed additives, like probiotic bacteria.2. This study investigated the impact of a commercial <i>Bacillus</i>-based probiotic on <i>Salmonella enterica</i> serovar Enteritidis (SE) colonisation in layer-type chicks, a critical issue for food safety. Lohmann Selected Leghorn chicks were divided into two groups, where one received GalliPro® Fit (Chr. Hansen A/S, Hoersholm, Denmark; 1.6 × 10⁶ CFU/g feed) from day-of-hatch, while the control group did not. On d 8, all chicks were orally challenged with SE (7-8 × 10⁵ CFU/bird). Cloacal swabs were collected on d 8, 10, 11 and 12 to assess shedding, and caecal contents were analysed for SE counts after euthanasia on d 12. The study was repeated three times with 30 chicks per group in each trial under consistent housing, husbandry and feeding conditions, except for differing parental bird origins. Shedding analysis was not performed in the final trial.3. The results were inconsistent. In the first trial, probiotic-treated chicks showed significantly reduced SE shedding and caecal loading compared to the control group. However, in the second trial, shedding and caecal loads were significantly higher in the probiotic group. The third trial revealed no significant differences between the groups.4. These findings showed that the probiotic effect on SE colonisation was inconclusive, despite identical experimental conditions, apart from parental bird origin. This highlighted the potential influence of parental health on offspring immunocompetence and gut microbiota, underscoring the challenges in interpreting <i>in vivo</i> studies. This study emphasised the need for reproducibility and careful evaluation of factors affecting trial outcomes.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-6"},"PeriodicalIF":1.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143572193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlling microbial population in poultry industry using acidic and slightly acidic electrolysed water as a potential non-thermal food sanitizer.","authors":"H B Poçan, M Karakaya","doi":"10.1080/00071668.2025.2455522","DOIUrl":"https://doi.org/10.1080/00071668.2025.2455522","url":null,"abstract":"<p><p>1. The effects of electrolysed water (acidic or slightly acidic) on microbial load and physicochemical properties of chicken carcases were determined. Chicken carcases treated with chemical decontamination solution (chlorine dioxide) on the slaughter line were used as the control group (C). The other two experimental groups consisted of groups A - treated with acidic electrolysed water and B - treated with slightly acidic electrolysed water.2. On d 1 and 7 post slaughter, samples were evaluated for physicochemical and microbiological characteristics. The pH, oxidation reduction potential (ORP) and available chlorine concentration (ACC) values of the solutions used in the application were determined.3. During storage, lipid oxidation remained stable in the samples treated with slightly acidic electrolysed water (<i>p</i> < 0.05). In addition, the application of acidic electrolysed water significantly (<i>p</i> < 0.05) decreased <i>b*</i> (yellowness) colour in the samples. Carcases in the A group had the lowest counts of total coliform bacteria, total mesophilic aerobic bacteria and <i>S. aureus</i> on d 1 (<i>p</i> < 0.05). <i>Campylobacter</i> counts in samples from group B significantly (<i>p</i> < 0.05) decreased during the storage period. The lowest <i>E. coli</i> count was detected in group A on both d 1 and 7 (<i>p</i> < 0.05). The reduction in <i>Salmonella</i> spp. counts during storage was similar in all groups.4. The results suggested that electrolysed water applications may be appropriate as an alternative to the chlorine dioxide solution used on the slaughter line in chicken slaughterhouses.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-7"},"PeriodicalIF":1.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143572192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short- and long-term sex-dependent effects of a nutritional supplement after hatching on growth, metabolism and gut microbiota in broiler chickens.","authors":"C Leterrier, A Collin, F Kempf, O Zemb, L Cauquil, E Cailleau-Audouin, P Chartrin, C Parias, J Delaveau, C Rat, K Germain, L A Guilloteau","doi":"10.1080/00071668.2025.2465350","DOIUrl":"https://doi.org/10.1080/00071668.2025.2465350","url":null,"abstract":"<p><p>1. In chicken production, a delay occurs between hatching and placement in the rearing building. This work analysed the effects of this experience on growth, metabolism, and caecal microbiota and tested whether a nutritional supplement (SUP) could mitigate these effects.2. Chicks were placed directly in a rearing room (Control: C) or were exposed to a 24 h period without feed and water before being placed (Delayed: D). During the 24 h period, half of each group was provided with a SUP.3. The D effect reduced body weight until d 27 in females (<i>p</i> = 0.017) and d 34 in males (<i>p</i> = 0.015). On d 1, the D group had reduced plasma triglycerides (TG) and increased uric acid (UA), total antioxidant status (TAS) and liver thiobarbituric acid reactive species in both sexes (<i>p</i> < 0.050). On d 34, the D group had increased UA and TAS only in females. It increased the α-diversity of microbiota in males (d 12 <i>p</i> = 0.036; d 34 <i>p</i> = 0.038) and the α-diversity in females on d 34 (<i>p</i> = 0.008). Changes in microbiota composition in both males and females were observed until d 34 at the genus level.4. On d 1, the SUP increased glucose concentration in D and C group males (<i>p</i> = 0.001) and females (<i>p</i> = 0.002). The decrease in TG and increase in UA concentrations and TAS in chicks from the D group were mitigated by the SUP in females. On d 34, SUP reduced the haptoglobin-like activity in D and C group males (<i>p</i> = 0.041) and increased the TG concentration in C group males (<i>p</i> = 0.016). The SUP had little effect on the caecal microbiota.5. Delayed placement induced long-lasting effects on growth, metabolism, and caecal microbiota composition. The effects of a nutritional supplement were variable and sex-dependent.</p>","PeriodicalId":9322,"journal":{"name":"British Poultry Science","volume":" ","pages":"1-14"},"PeriodicalIF":1.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143572194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}