Animal - Open Space最新文献

{"title":"A dataset to study group-housed sows’ individual behaviours and production responses to different short-term events","authors":"M. Durand ,&nbsp;C. Largouët ,&nbsp;L. Bonneau de Beaufort ,&nbsp;J.Y. Dourmad ,&nbsp;C. Gaillard","doi":"10.1016/j.anopes.2023.100039","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100039","url":null,"abstract":"<div><p>The relational database SOWELL was created to better understand the behaviour and individual responses of gestating sows facing different short-term events induced: a competitive situation for feed, hot and cold thermal conditions, a sound event, an enrichment (straw, ropes and bags available) and an impoverishment (no straw, no objects) of the pen. The data were collected on 102 crossbred sows equipped with activity sensors, group-housed in video-recorded pens (16–18 sows per pen), with access to automatons. Feeding and drinking behaviours were extracted from the electronic feeders and drinkers’ recordings. Social behaviours, physical activities and locations in the pen were recorded thanks to manual video analysis labelling at the individual scale. Accelerometer fixed on the sows’ ears also recorded individual physical activities. The physical activity was also determined at a group scale by automatic video analysis using deep learning techniques. BWs, back fat thickness, and body condition (cleanliness, body damages) were recorded weekly during the whole gestation. Last gestation room data regarding environmental conditions (temperature, humidity, noise level) were recorded using automatic sensors. The database can fulfil different research purposes, namely sows’ nutrition for example to better calculate the energy requirements regarding environmental factors, or also on welfare or health during gestation by providing indicators.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100039"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49706917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A workflow to study the microbiota profile of piglet’s umbilical cord blood: from sampling to data analysis","authors":"Francesco Palumbo ,&nbsp;Marion Girard ,&nbsp;Federico Correa ,&nbsp;Giuseppe Bee ,&nbsp;Paolo Trevisi","doi":"10.1016/j.anopes.2022.100031","DOIUrl":"https://doi.org/10.1016/j.anopes.2022.100031","url":null,"abstract":"<div><p>The possibility of pre-birth microbiota colonisation remains controversial in the scientific community. Due to the placenta’s characteristics in pigs, the umbilical cord is the sole way for mother-foetus microbial transmission to occur. Studies on this topic have demonstrated conflicting results; some of these discrepancies might be due to differences during sampling, DNA extraction, bioinformatics and data analysis. The aim of this study is to assess a workflow for characterising the umbilical cord blood microbial profile by adjusting for the contaminating sources of bacterial DNA during the extraction procedure. The results show that among 735 amplicon sequence variants (<strong>ASVs</strong>), 568 ASVs were contaminants, while 165 ASVs were true samples. Using this workflow, we could distinguish the contaminant ASVs introduced during bacterial DNA extraction and amplification. With the results of the present study, however, we cannot confirm the pre-birth bacterial transfer by the umbilical cord blood due to the lack of samples representative of the contaminants in the surrounding sampling environment. Nevertheless, the present study can be used as a reference to address low microbial biomass, particularly with umbilical cord blood.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100031"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49707063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of multispecies and monoculture forages on nutrient digestibility and fermentation responses using an in vitro rumen simulation technique (RUSITEC)","authors":"A.S. Khan ,&nbsp;J.A. Finn ,&nbsp;A.B.D. Menezes ,&nbsp;S.F. Kirwan ,&nbsp;S.M. Waters ,&nbsp;D.J. Krol","doi":"10.1016/j.anopes.2023.100052","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100052","url":null,"abstract":"<div><p>Enteric methane (<strong>CH₄</strong>) emissions are a major contributor to global greenhouse gas emissions. A number of different CH₄ mitigation strategies have been proposed, and the inclusion of alternative forages into grazing systems could be a practical and feasible option. Multispecies swards comprise a mixture of forage species and can increase grassland productivity, reduce nitrogen fertiliser requirements, and reduce fertiliser-associated nitrous oxide emissions. This study investigated the potential benefit of multispecies swards in reducing ruminal CH₄ production. Using the <em>in vitro</em> rumen simulation technique, we compared the effects of different forages (perennial ryegrass, timothy, red clover, white clover, chicory, ribwort plantain and their equi-proportional mixture) on CH₄ and gas production, ruminal fermentation parameters and nutrient digestibility. We also compared these responses to perennial ryegrass produced with a higher nitrogen application rate (300 N). The experiment was conducted over 21 d, with the initial 14 d allowed for dietary adaptation. Over the subsequent 7 d, there were significant effects of forage type on CH₄ production, ruminal fermentation and digestibility. Ribwort plantain, chicory and white clover showed lower CH₄ production; with chicory producing 73% and 57% less CH₄ (mmol d⁻¹) compared to 300 N perennial ryegrass and 150 N perennial ryegrass incubation, respectively. Chicory had 72% lower CH₄ produced per gram of organic matter digested (mmol g⁻¹) than that of 300 N perennial ryegrass. Chicory and 300 N perennial ryegrass had greater (<em>P</em> &lt; 0.01) organic matter and nutrient digestibility (DM, CP, NDF, and ADF) than other forages. Greater ammonia nitrogen concentration was observed in chicory and both clover species, compared to the other forage species (<em>P</em> &lt; 0.01). In general, the response of the six-species mixture was not significantly different to the average response of the six component monocultures. Thus, from these data, the performance of multispecies swards for these responses (in general) was predictable from the performance of the component monocultures. These results showed that different grassland forages, especially chicory and white clover, have the potential to reduce ruminal CH₄ emissions and could be a promising anti-methanogenic alternative to chemical CH₄ inhibitors and feed additives. More generally, the relatively wide variation in CH₄ abatement potential across a small sample of plant species suggests the merit of wider screening to identify grassland species with high CH₄ abatement potential <em>in vitro</em>.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100052"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277269402300016X/pdfft?md5=8b92782b24f971a67836014884f858c8&pid=1-s2.0-S277269402300016X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138327805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bayesian inference for parameter identification in mechanistic models, exemplified using a cow lifetime performance model","authors":"J.F. Ramirez-Agudelo ,&nbsp;J.B. Daniel ,&nbsp;L. Puillet ,&nbsp;N.C. Friggens","doi":"10.1016/j.anopes.2023.100054","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100054","url":null,"abstract":"<div><p>Mechanistic models are valuable tools for studying the underlying mechanisms of complex biological phenomena. For example, cow lifespan models can be used to identify differences in resource acquisition and allocation strategies between individuals, which is relevant for decision-making in breeding programs. In such models, differences in simulated traits between individuals are consequences of the parameter set that represents the genetic potential of each animal and its interaction with the environment. This indicates that the identification of these differences is essentially a search for individual parameters. In mechanistic models, this search is generally a non-convex problem that has different local minima because the parameters interact within these models. Due to this and to the simulation time length (e.g. years), there is uncertainty associated with the inference of the parameter values for each individual. This uncertainty can be quantified using Bayesian inference since this approach treats the model parameters as random variables with an underlying probability distribution that describes them. The objective of this work was to employ the Delayed Rejection Adaptive Metropolis (<strong>DRAM</strong>) algorithm to identify the parameters of a cows’ lifespan model using two datasets of Holstein cows. The datasets contain periodic measurements of Milk Yield (<strong>MY</strong>), BW, and Body Condition Score (<strong>BCS</strong>). Additionally, one of the two datasets has information of BW from birth to first calving. The average Mean Absolute Percentage Error (<strong>MAPE</strong>) minimisation between the simulated and experimental data (MY, BW and BCS) was used as the objective function for parameter search. The Bayesian inference performance was compared with four optimisation metaheuristic approaches: Differential Evolution, Genetic Algorithm, Particle Swarm Optimisation, and Simulated Annealing. Although the results show that all methods are efficient in finding parameter values that reduce the distance between the simulated and experimental data (MAPE &lt; 10%), the DRAM method is more efficient in terms of computational cost, and the parameter distributions obtained with this method offer more information about the statistical properties of each parameter (e.g. median).</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100054"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772694023000183/pdfft?md5=7e2f753a78219842f03338299a69dc8e&pid=1-s2.0-S2772694023000183-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138839209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catheterisation of the jugular vein of 12-day-old suckling piglets group-housed with littermates and the sow","authors":"D. De Leonardis ,&nbsp;C.C. Metges ,&nbsp;A. Vernunft","doi":"10.1016/j.anopes.2023.100056","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100056","url":null,"abstract":"<div><p>Collection of blood samples by venipuncture requires isolation, restraint and immobilisation, which is stressful for piglets and may result in unreliable readings. A jugular vein catheter allows frequent blood sampling with minimal stress to the piglets. Techniques for jugular vein catheter implantation in older pigs have been described, but less information is available for suckling piglets. This report describes the procedure of catheter implantation into an external jugular vein for longer-term frequent blood sampling in 48 12-day (<strong>d</strong>)-old suckling German Landrace piglets with a mean BW of 3.4 ± 0.7 kg. Catheterisation was performed either under general anaesthesia by injection of azaperone and ketamine (<strong>a/k</strong>) or by inhalation of isoflurane (<strong>IsoF</strong>). To determine the optimal incision site in the <em>sulcus jugularis</em>, the centre between the caudal edge of the <em>mandibula</em>, cranial shoulder and <em>sternum</em> was identified. After a small incision of the skin, the jugular vein was bluntly dissected and a catheter was inserted. The tip of the catheter was placed near the beginning of the right atrium. After wound closure, the surgical area was secured by disinfection and bandages. The piglets were returned to their littermates in the farrowing pen immediately after full recovery from anaesthesia, which was 5–7 h in a/k and 0.75 h in IsoF anaesthetised piglets after the onset of the surgery, respectively. The catheter was flushed daily with 0.9% NaCl-0.1% sodium citrate solution. To demonstrate the longer-term benefits of the catheter, on d 4 after surgery, a series of frequent blood sampling were performed after an oral xylose bolus. In total, 10 samples of 0.5 mL were taken before and every 30 min after the oral xylose bolus for 5 h; the blood volume was replaced with 0.9% NaCl solution. On d 4 after surgery, 41 of 48 implanted catheters were considered fully functional (90% of desired samples collected), three as partially functional, and four as non-functional, whereas two catheters were non-functional already from d 1 after surgery. The catheterised animals remained clinically healthy but showed less daily BW gain from age d 12 (day of surgery) to d 15 than non-catheterised control animals (0.12 ± 0.01 vs 0.23 ± 0.01 kg; n = 46; <em>P</em> &lt; 0.05). In conclusion, the catheter implanted into an external jugular vein in 12-d-old suckling piglets remaining with the sow was patent for 4 d after surgery and allowed frequent blood sampling with minimal stress for the piglets.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100056"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772694023000201/pdfft?md5=6ec440e97cb0e1e136938571090d11ec&pid=1-s2.0-S2772694023000201-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138839181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lactational performance of cows fed extruded flaxseed in commercial dairy herds","authors":"A. Beauregard,&nbsp;M.-P. Dallaire,&nbsp;R. Gervais,&nbsp;P.Y. Chouinard","doi":"10.1016/j.anopes.2023.100043","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100043","url":null,"abstract":"<div><p>The objective of the current on-farm trial was to assess the impact of feeding extruded flaxseed on milk yield and composition. Thirty commercial dairy herds located in the province of Québec, Canada were recruited. The experiment began with a baseline period of 2 months during which each cow received their regular diets. Data collected during this period were used as covariate. Farms were then randomly allocated into a control group (n = 15; 767 cows) which continued to receive their regular diets, or a treatment group (n = 15; 863 cows) which received diets supplemented with extruded flaxseed (0.7 kg/d per cow) during an experimental period of 7 months. Significance was declared at <em>P</em> ≤ 0.05 and tendencies at 0.05 &lt; <em>P</em> ≤ 0.10. Feeding extruded flaxseed did not affect feed intake but increased milk yield by 1.1 kg/d per cow, and feed efficiency by 6.5%. Dietary addition of extruded flaxseed increased milk fat (tendency) and lactose yield, whereas milk protein yield was similar between treatments. Estimated CH₄ intensity were reduced by 1.3 g/L of milk (−9.2%) in herds receiving extruded flaxseed. Feeding extruded flaxseed increased milk fat concentration of <em>cis</em>-9, <em>cis</em>-12, <em>cis</em>-15 18:3 and total n-3 fatty acids. Results of the current on-farm trial confirm observations made under experimental conditions that feeding moderate levels of extruded flaxseed improves production performance in dairy cows.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100043"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49713028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen efficiency in cows fed red clover- or alfalfa-silage-based diets differing in rumen-degradable protein supply","authors":"M. Leduc,&nbsp;R. Gervais,&nbsp;P.Y. Chouinard","doi":"10.1016/j.anopes.2023.100050","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100050","url":null,"abstract":"<div><p>Nitrogen pollution is an important issue in modern agriculture. For the dairy industry, increasing the efficiency of milk protein production may reduce the environmental impact of commercial farms. Optimal N utilization can be achieved by combining forage and concentrate varying in their degradability in the rumen. The aim of this study was to gain insight into the fate of dietary N as affected by forage type and rumen-degradable protein supply in lactating dairy cows, with an emphasis on milk N efficiency. Four rumen-fistulated Holstein cows were used in a 4 × 4 Latin square design balanced for residual effects. Four treatments consisting of a 2-by-2 factorial arrangement of alfalfa silage (<strong>AL</strong>) or red clover (<strong>RC</strong>)-based diets designed to satisfy 100 (rumen-degradable protein (<strong>RDP</strong>)-100) or 85% (RDP-85) of rumen degradable protein demand, by varying the amounts of ground and steam-flaked corn grain, as well as non-treated and heat-treated soybean meals. Dietary CP concentrations were greater in diets based on AL as compared with RC (<em>P</em> &lt; 0.01). Kinetics of <em>in sacco</em> N disappearance revealed that the rapidly disappearing fraction was lower with RC than with AL diets, and this difference tended to be more pronounced for RDP-85 than RDP-100 (interaction, <em>P</em> = 0.06). On the contrary, slowly disappearing N fraction and fractional rate of disappearance were greater for RC as compared with AL diets (<em>P</em> &lt; 0.01). Reducing RDP from 100 to 85% of requirements increased the slowly disappearing N fraction, but decreased the rapidly disappearing fraction and the fractional rate of disappearance of N (<em>P</em> &lt; 0.01). Intakes of DM and N were lesser with RC compared with AL, and these differences were more pronounced with RDP-85 than with RDP-100 (interaction, <em>P</em> ≤ 0.04). As a proportion of N intake, fecal excretion tended to be greater (<em>P</em> = 0.09), whereas urinary excretion was lower (<em>P</em> = 0.04) with RC than with AL diets. Milk yield (tendency; <em>P</em> = 0.07) and total N secreted in milk were reduced (<em>P</em> &lt; 0.01) with RC compared with AL diets. Feeding RC increased milk N efficiency (g of milk N/ kg of N intake) as compared with AL, and this difference tended to be of greater magnitude for RDP-85 than RDP-100 (interaction, <em>P</em> = 0.06). In conclusion, combining forage and concentrate of different CP degradability can improve milk N efficiency in dairy cows.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100050"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49713227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of hydrogenated fat-embedded calcium gluconate on lactation performance in multiple commercial dairy herds","authors":"M.V. Sanz-Fernandez ,&nbsp;D.J. Seymour ,&nbsp;J.B. Daniel,&nbsp;J. Doelman,&nbsp;J. Martín-Tereso","doi":"10.1016/j.anopes.2023.100048","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100048","url":null,"abstract":"<div><p>Upon fermentation in the hindgut, gluconate acts as a prebiotic having shown benefits in multiple species. In previous studies, hydrogenated fat-embedded calcium gluconate (<strong>HFCG</strong>), developed to target the hindgut, improved milk and component yields in highly controlled research settings. The objective of the current study was to confirm these results in commercial dairy herds. Six farms, comprising a total of 907 lactating Holstein cows, were enrolled in a randomised cross-over design where the supplementation of HFCG (16 g/cow/d) was compared against a control. Farms were randomly assigned to one of the two possible treatment sequences and treatments were applied for ∼56 d. Milk yield and composition were measured on two milk test-days on approximately d 26 and 56 of each treatment period, and an average per animal per period was calculated. The effect of HFCG supplementation on performance was statistically analysed with two approaches: (1) using individually recorded milk yield and analysed milk composition from each test-day retrieved through the cattle improvement cooperative organization CRV (Arnhem, the Netherlands), and (2) using residual performance obtained by subtracting the observed from the predicted values estimated by the herd test-day model of CRV. Supplementing HFCG increased milk yield (3.6%; <em>P</em> = 0.02), protein content (1%; <em>P</em> = 0.01) and yield (4.6%; <em>P</em> = 0.01), and lactose yield (3.4%; <em>P</em> = 0.04); and tended to increase energy-corrected milk (3.1%; <em>P</em> = 0.10). The analysis of the residual performance retrieved similar trends, although with diminished statistical significancy. During the control period, milk yield, fat and protein yield, and urea content residuals were negative and significantly different from zero (<em>P</em> ≤ 0.05), indicating that farms underperformed relative to predictions. In contrast, during HFCG supplementation, farms performed as predicted. Overall, these results confirm the effectiveness of HFCG supplementation at improving performance at farm level.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100048"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49706892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of oregano essential oil on Feed Passage Syndrome in broilers: 1. Assessment under field conditions","authors":"D.A. Martinez ,&nbsp;C.L. Ponce-de-Leon ,&nbsp;C. Vilchez-Perales","doi":"10.1016/j.anopes.2023.100046","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100046","url":null,"abstract":"<div><p>Feed Passage Syndrome (<strong>FPS</strong>) is a prevalent condition that includes wet excreta, with undigested feed, and loss of feed efficiency, with multiple predisposing factors involved. Alternatives to antimicrobials, including phytogenics, are being studied to control this process. This study aimed to assess oregano essential oil (<strong>OEO</strong>) in broilers subjected to a natural field FPS challenge. Four broiler houses (two males; two females) presenting FPS were divided into two groups per house and assigned to a control or OEO-treated group through drinking water for five days. The FPS was characterized by &gt;30% wet droppings, &gt;50% with undigested feed, &lt;5% with desquamated mucosa, &gt;10% birds with enteritis, and 90% with undigested feed in the lower ileum, and flocks clinically positive for dysbacteriosis. After a five-day treatment, OEO-treated birds showed fewer abnormal droppings (<em>P</em> &lt; 0.05), reduced the prevalence of dysbacteriosis (<em>P</em> = 0.0404), and a progressively recovering BW. The OEO treatment showed to influence the Gompertz growth curve parameters (growth rate, <em>P</em> = 0.0165; inflection point, <em>P</em> = 0.0359), potentially reducing the age at the target market weight in 0.8 days. In conclusion, the results indicate that the OEO treatment in drinking water for broilers naturally challenged with the Feed Passage Syndrome may improve excreta characteristics and attenuate the negative impact of the syndrome on the BW.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100046"},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49706684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of oregano essential oil on Feed Passage Syndrome in broilers: 2. Assessment under a challenge model","authors":"D.A. Martinez ,&nbsp;C.L. Ponce-de-Leon ,&nbsp;C. Vilchez-Perales","doi":"10.1016/j.anopes.2023.100045","DOIUrl":"https://doi.org/10.1016/j.anopes.2023.100045","url":null,"abstract":"<div><p>Feed Passage Syndrome (<strong>FPS</strong>) in broilers is a multifactorial condition characterized by wet excreta and decreased feed efficiency, which can be triggered by various contributing factors. Alternatives to antimicrobials, including phytogenics, are being studied to control this process. This study assessed oregano essential oil (<strong>OEO</strong>) in broilers subjected to a FPS challenge model. Three treatments (negative control, neomycin-fed positive control, and OEO-fed group) were included. All treatments were challenged with reused litter, inoculums of <em>Eimeria</em> spp. and <em>Clostridium perfringens</em>, and excess dietary CP. OEO-fed birds showed improved performance, better excreta characteristics, lower frequency of congested mucosa, reverted hyperplasia of the bursa of Fabricius, better antioxidant status, and higher breast and carcass weights and dietary protein and energy efficiencies. The OEO treatment was shown to influence the growth pattern of the broilers. In conclusion, the OEO showed positive effects in broilers challenged with a FSP model.</p></div>","PeriodicalId":100083,"journal":{"name":"Animal - Open Space","volume":"2 ","pages":"Article 100045"},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49706685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}