ABSTRACT Caatinga is a biome unique to Brazil, where degradation caused by anthropogenic actions has led to loss of biodiversity and put many species at risk of extinction. The Ceará state is located within the Caatinga and has a rich avifauna. It comprises 433 species, including 13 species that are in danger of extinction, which are found in the Baturité Massif. The aim of this study was to investigate the frequency and diversity of enterobacteria in wild birds and determine their susceptibility to antimicrobials. Cloacal swab samples were collected from 50 individuals of 28 different species, including the Ceara Gnatheter (Conopophaga cearae) and the Red-necked Tanager (Tangara cyanocephala), which are classified as vulnerable (VU) by the Brazilian Ministry of the Environment. A total of 55 isolates belonging to 14 different species of Enterobacteriaceae were identified. Among them, Pantoea agglomerans and Escherichia coli were the most prevalent species with isolation rates of 36% and 26%, respectively. The highest rate of antimicrobial resistance found was to ampicillin (41.8%), followed by nalidixic acid (36.3%) and amoxicillin associated with clavulanic acid (32.7%). Drugs that presented best efficacy were tobramycin (96.4%), ciprofloxacin (92.6%), and tetracycline (90.9%). Multidrug resistance was observed in 23.5% of the analyzed strains. This research provides important information about the composition of the cloacal microbiota of wild birds in Mulungu, Brazil, as well as their health status. Additionally, these results demonstrate that they harbor multidrug-resistant strains of Enterobacteriaceae.

ABSTRACT Blue eggshells have become economically valuable due to their higher popularity among consumers when compared with eggs of other colors, particularly in East Asia. However, eggshell colors vary widely and gradually become lighter with the increase of age. Therefore, to determine the association between DNA methylation and gene expression on the molecular mechanism of eggshell color variation in Xuefeng Black-bone chickens, we collected the shell glands from chickens that produced dark blue eggshells and light blue eggshells, respectively, and performed whole genome bisulfite sequencing (WGBS) and RNA sequencing (RNA-Seq) on them. The results showed that in the context of CG, DNA methylation levels were the highest compared to CHG and CHH contexts, and were negatively correlated with gene expression levels in three different gene regions in all samples, while there was no significant correlation in the contexts of CHG and CHH. Furthermore, when disregarding the location of coding genes, a total of 55 genes will show differences not only in expression levels but also in DNA methylation levels, and among the majority of differential expression genes (n=50), the DNA methylation levels in the gene body region were the highest. GO analysis and KEGG pathway analysis were performed in these genes and the results showed that the genes NR1H4 and HEPHL1, ABCA4 and ABCA12, and the pathways, cell adhesion molecular, ABC transporters, ECM-receptor interaction, and neuroactive ligand-receptor interaction, may affect the color variation of the blue eggshell of Xuefeng Black-bone chickens.

ABSTRACT This study aimed to investigate the relationship between pre-slaughter factors and major causes of total or partial carcass condemnation in a broiler slaughterhouse under federal inspection. Data on total and partial carcass condemnations between 2018 and 2020 were collected from 10 broiler farms supplying a slaughterhouse located in northern Paraná State, Brazil. The total sample comprised 2,562,642 birds. The pre-slaughter factors analyzed were age at slaughter, stocking density, weight at slaughter, feed conversion, and mortality.Associations between causes of condemnation and pre-slaughter factors were analyzed using a generalized linear model with negative binomial distribution, a generalized linear model with quasi-Poisson distribution, and a generalized linear mixed model with Poisson distribution. Total carcass condemnations were mostly due to repugnant appearance (48.67%) and arthritis (26.56%), whereas partial carcass condemnations were mainly due to arthritis (31.02%), bruising (27.97%), and myopathies (15.18%). Mean age and stocking density were the pre-slaughter factors that most contributed to increasing total and partial condemnation rates, indicating that reducing stocking density and age at slaughter might be important strategies for minimizing economic losses associated with carcass condemnation.

ABSTRACT Our study aimed to compare the cecum of German mast geese with other poultry species through macroanatomy and scanning electron microscope (SEM). Adult German geese were used as research material, which were obtained from its breeders and died of various causes. In the study, after determining the macroanatomical features of the German mast goose cecum, it was examined with a scanning electron microscope (JEOL JSM-5600LV) and the general structures were photographed. The craniodorsal of the rectum of German mast geese was shaped with two ceca, giving right and left arms to the cranial symmetrical to each other near the end of the ileum. The macroanatomy of the apex, corpus, and basis cecum parts was examined in the cecum divided into two. In the study, it was determined that villus extensions were sparse in the right and left apex ceci parts in the cecum SEM images of the German mast geese, while the number of the corpus and basis ceci parts was higher. As a result, the macroanatomy and scanning electron microscopic findings of German mast geese cecum were examined in detail and its differences from other poultry species were revealed.

ABSTRACT Gut microbiota plays an important role in animal health, production and diseases. Little is known about whether heat stress alters the composition of quail gut microbiota; therefore, we studied the effects of heat stress on growth performance, antioxidant functions, heat shock proteins and caecal microbiota. Two groups of 40 (20-day-old) quails were set up, including a control reared at 24 ± 2°C and a heat stress group subjected to heat stress at 36 ± 2°C for 4 h per day for 7 consecutive days. We found that heat stress significantly elevated the relative expression levels of HSP70 and HSP90 mRNA in the thymus, bursa and spleen by real-time fluorescence quantitative PCR assay, indicating successful establishment of the experimental model. Heat stress was found to have an effect on gut microbiota composition. At the genus level, Alistipes were significantly increased in the heat stress group. PICRUSt2 function prediction revealed that most of the KEGG pathways with high temperature-induced abundance differences are metabolism-related. These data indicated that heat stress reduced the production performance of quails by affecting antioxidant functions, as well as the composition and structure of the intestinal microbiota. The results of this study provide technical information for conducting research on heat stress prevention and control techniques in quails.

ABSTRACT The current study investigated the efficacy and optimal feeding level of Rumex nervosus leaves (RNL) in broilers infected and uninfected with Eimeria tenella. In a factorial design of 2 (coccidial challenge or not) 5 (feed treatments), 250-day-old broiler chicks were randomly assigned to one of ten groups and reared for 28 days. Intestinal measurements, carcass traits, serum biochemical indices, leukograms, performance and anticoccidial indicators were investigated. All selected parameters were not significantly (p>0.05) altered by the interactions between the experimental diet and challenge at 7 days post-infection, with the exception of serum levels of albumin and globulin, as well as the anticoccidial index. Infected broilers had a lower performance indicator, poorer production efficiency, poor anticoccidial indices, heavier gizzard, longer and heavier small intestine, shorter cecum, and higher proportion of eosinophils compared with uninfected broilers. The RNL had marked anticoccidial efficacy at a dose of 5 g. The current study found that Rumex nervosus leaf powder had mild to marked, dose-dependent anticoccidial preventive efficacy in broilers. However, further studies are needed to fully understand the anticoccidial mechanisms.

ABSTRACT This study was conducted to determine the effect of bee pollen inclusion on the performance and gut morphology of Ross 308 broiler chickens. A total of 240-day-old chicks (120 males and 120 females) were allocated to 4 treatments in a randomized complete block design (RCBD) with sex as a block. Each experimental group was replicated 3 times with 10 chicks per replicate, with an average weight of 40 ± 5g per bird. Body weight and feed intake were measured on a weekly basis to calculate the feed conversion ratio. Gut morphology was measured on days 21 and 42. Data were analysed using the General Linear Model procedures of the Statistical Analysis System.Bee pollen inclusion in starter diets had an effect (p<0.05) on body weight and live weight gain of male Ross 308 broiler chickens. The different inclusion levels of bee pollen had an effect (p<0.05) on the gut morphology of Ross 308 broiler chickens. The ileum lengths of female broiler chickens were significantly wider (p<0.05) in comparison with male chickens. This may suggest that bee pollen inclusion has a beneficial effect on broiler chickens gut morphology during the early stages of development. It can be concluded that natural substances such as bee pollen can be a possible feed additive to replace synthetic antibiotics, since such compounds are essential for the growth and development of poultry gut.

ABSTRACT The aim of this study was to evaluate the health situation of chukar partridges through several diagnostic methods. We investigated a total of 224 birds in eighteen populations throughout Turkey, fourteen wild and four captive. The molecular sexing method was used for gender identification. Clinically, traumatic lesions and inflammatory reactions were the most commonly observed in the eyes and extremities of the Chukar Partridges in the breeding stations. At necropsy, the most common findings were enteritis and liver lesions. At the histopathological examination, pneumonia, anthracosis, and inflammatory changes in the digestive system were among the common findings. Interestingly, liver parasites were found in wild samples. At the immunohistochemical examinations, the tissues were evaluated for Marek’s disease (MD), Adenovirus, Avian mycobacteriosis (AMB), and Aspergillosis. While MD and AMB were not found in breeding stations, we determined them from wild populations. Aspergillus was found in both wild and captive populations; Adenovirus antigens were found only in breeding stations. When the captive and wild populations were evaluated together, MD 1.3%, AMB 0.9%, Aspergillosis 1.3%, Adenovirus 1.8% were found. The relation between sex and diseases was also examined. As a result, the data of this study showed that chukar partridges from both breeding stations and wild populations are not an important source of diseases, but especially released partridges from breeding stations may carry some microorganisms. For that reason, captive populations should be regularly monitored for contagious diseases.

ABSTRACT The purpose of this study was to investigate the effect of sunflower kernel peptides produced by enzymatic digestion, fermentation, or both on the growth performance, nutrient digestibility, and health status of broilers. Four diets contained 20% of sunflower kernel meal as its raw form (CON) or degraded by protease (ESM), Bacillus pumilus (FSM), or both (DSM). A total of 480 yellow broilers at one day old were randomly distributed to 4 groups with 6 replicates of 20 chicks each. The feeding trial lasted for 63 d. Results showed that peptide content was increased (p<0.001) from 3.97% (CON) to 32.5% (ESM), 24.2% (FSM), and 39.1% (DSM). The three sunflower peptide groups improved (p≤0.001) feed intake and body weight gain. The peptide groups increased (p≤0.015) ileal apparent digestibility of dry matter, energy, crude protein, and amino acids (methionine, lysine, tryptophan, and threonine). Furthermore, the peptide groups improved (p≤0.029) the health status by increasing serum immunoglobulins (IgA, IgG) and glutathione peroxidase. Additionally, among the peptide groups, DSM showed more pronounced effects (p<0.05) on these parameters than ESM or FSM. It is concluded that dual-degradation by enzymolysis and fermentation has a better improvement in the nutrition and application of sunflower kernel meal in broilers.

ABSTRACT This study described changes in the serum biochemistry, morphology of genital organs, long bone, and eggshell during the daily egg formation cycle in Japanese quails. Sixty quails (18-wk) were distributed in 6 groups according to hours post-oviposition (POV): 0 hr POV (16h00), 2 hrs POV (egg in magnum), and 4, 8, 14, and 20 hrs POV (egg in uterus). The magnum had higher relative weight before the next ovulation (20 and 0 hr POV), and its tubular glands showed functional variation through periods: abundant eosinophilic, PAS+, and negative Alcian blue secretion at 0 and 2 hrs, empty glands aspect at 4 hrs, and filled again at 20 hrs POV. Serum albumin and total Ca had the highest value in the 2 hrs group, and the lowest in 8 and 14 hrs groups. Egg-cycle period affected the Ca% of the medullar bone of the femur and tibiotarsus, with the lowest mean at 14 hrs POV (06h00), and the highest mean after oviposition (0 hr POV), showing the recovery of Ca stores in long bones for the next egg cycle. Analysis of the eggshell using scanning electron microscopy evidenced that palisade layer formation starts during the night (8-14 hrs POV), and most parts are secreted during the day period. In conclusion, eggshell secretion in light periods, high magnum activity and medullary bone Ca deposition during midday and afternoon, as well as the ovulation/oviposition in the afternoon, are the main characteristics of the distinct physiological aspects of the egg cycle in quails.

ABSTRACT This study investigated the effect of resveratrol on the immune and inflammatory responses and the mRNA levels of splenic toll-like receptor (TLR)-4 signaling pathway-related genes of broilers under heat stress (HS). One hundred and sixty-two birds were allocated to three groups, each with 6 replicates, for 21 continuous days. The three treatments were as follows: the control group (22 ± 1 °C), the HS (33 ± 1 °C for 10 h d-1 and 22 ± 1 °C for the remaining time) group and the HS + resveratrol (400 mg kg-1) group. At the end of the trial, one bird per replicate close to the average body weight (BW) was selected, exsanguinated, and slaughtered. Compared with the control group, the HS treatment decreased (p<0.05) final BW, average daily gain (ADG), average daily feed intake (ADFI), relative weight of bursa of Fabricius and spleen, serum immunoglobulin (Ig) Y, IgA and interleukin (IL)-10 contents, and splenic IL-10 mRNA level, while it increased (p<0.05) feed/gain, mRNA levels of splenic tumor necrosis factor-α (TNF-α), TLR-4, nuclear factor-kappa-B (NF-κB), IL-1β, and IL-6. Compared to the HS group, the HS+resveratrol group exhibited increased (p<0.05) final BW, ADG, relative weight of bursa of Fabricius and spleen, serum IgY, IgA and IL-10 contents, and splenic IL-10 mRNA level, while it exhibited lower (p<0.05) TNF-α, IL-1β and IL-6 contents in serum, and splenic TLR4, TNF-α, IL-1β, and NF-κB mRNA levels. In conclusion, resveratrol prevented a HS-impairment of the immune function of broilers by blocking the abnormal activation of the TLR4 signaling pathway.

ABSTRACT For smallholder farmers, indigenous village chickens (IVCs) serve as a source of food, income, and ritual items. In practice, there is a high demand for IVC products, and when this demand is coupled with low investment in production inputs, it makes IVC production a rewarding rural business. Regardless of a lot of complaints about its efficacy, the marketing system of IVCs remains a viable transaction method and perfectly matches the extensive production system. This study documented the marketing system of IVCs operating in smallholder settings using a cross-sectional study. There is high volatility in the demand for IVC products, which is attributable to the demographic structure of the community and the weak purchasing power of consumers. The market price of live birds is fixed in line with the specifics of the multifaceted demand of the local community. Agroecology significantly affects the age at which the birds reach marketable size (t = 3.508, df = 113, p = 0.001, 95% CI -1.9359 to -0.5384). There is an inclined tendency to sell live birds rather than eggs (x-squared = 46.512, df = 1, p-value = 9.104e-12) and most of the home-hatched birds are sold out. Due to the involvement of hundreds of millions of smallholder farmers that are living in rural areas, millions of actors are needed to execute the market transaction, which significantly reduces the income accrued by smallholder farmers and the utility of consumers.

ABSTRACT The objective was to evaluate whether space allowance during pre-slaughter transport of European breeding quail affects welfare, carcass traits and meat quality. A total of 248 quails (body weight = 344.90 ± 2.09 g) were used. During pre-transport, the quails were fasted for 5 hours and 30 minutes. The poultry were caught and placed in plastic transport crates with an area of 0.40 m2. The treatments consisted of a different space allowance in each crate: 22, 28, 34 or 40 quails per crate. Immediately upon arrival at the slaughterhouse, the quails were stunned. During bleeding, blood samples were collected. The carcasses were individually weighed. The meat quality was measured. Data were analysed using the effects of space allowance during transport of quails and pickup truck as dependent variables. Death on arrival increased as the space allowance in transport crates decreased (p=0.08). Glucose and uric acid levels were not significantly different between groups (p≥0.14). The cold carcass weight presented the maximum value when the crates contained 31 quails (p=0.03). The meat pH, intensity of red, intensity of yellow and cooking losses were not different between groups (p≥0.12). The meat lightness value presented the maximum value when the crates contained 31 quails (p=0.04). In view of the above, the number of European breeding quails transported in crates must not exceed 30 animals.

ABSTRACT The present study was executed to evaluate the effect of lighting programs for meat quails on their bone growth and development. A total of 1500 sexed European quails (Coturnix coturnix coturnix) were distributed using a completely randomized design in a 2 × 3 factorial arrangement, with two sexes and three lighting programs (natural, intermittent, and continuous) with five replicates of 50 quails. The lighting programs were applied in the period from 7 to 49 d of age. Weekly slaughterings were performed to remove the tibiotarsus and femur and subsequently determine weight, length, dry and mineral matter content. The growth and deposition curves of dry and mineral matter in the bones were obtained using the Gompertz model. There was no significant interaction between lighting programs and sex for the estimates of the Gompertz curve parameters of all variables studied. There was an effect of the lighting programs only on the time needed to reach the maximum deposition rate of the growth curve and dry and mineral matter deposition. Females showed higher weight and deposition of mineral matter at maturity, and took longer to reach the maximum deposition rate value for these variables. There was influence of the lighting programs on resistance and bone deformity of the tibiotarsus. For quails raised in the tropical region, a natural or intermittent lighting program must be used, as it does not compromise the development of bones and assures bone quality.

ABSTRACT Growth pattern is essential for economically efficient poultry production. In this study, we aimed to describe the growth curve of chickens of the Canela-Preta breed reared in two different rearing systems, considering their different plumage colors. Initially, 204 one-day-old male and female chicks were randomly distributed in confinement and semi-confinement (102 animals in each system) without separation by gender. The animals were individually identified by wing and foot plastic brands and were weighted every seven days. The body weight and age records were used to estimate the growth curves of the following factors using the Richards model: plumage color, gender, and rearing system. The likelihood ratio test was used to verify the equality of parameters and identify nonlinear models to compare the growth patterns of the evaluated groups. The growth pattern of Canela-Preta chickens changed as a function of gender, plumage color, and rearing system. Females with black plumage, black and gold hens, and males with black and white plumage showed greater sensitivity to changes in rearing systems. Within-breed selection strategies for specific colors can improve the use of growth pattern differences, improving production efficiency. Semi-confinement is suitable for rearing Canela-Preta chickens with any plumage color, as these animals meet the free-range poultry niche market requirements.