Polish journal of veterinary sciences最新文献

Porcine parvovirus (PPV) is a major causative agent in reproductive pig disease. The swine industry faces a significant economic and epizootic threat; thus, finding a reliable, quick, and practical way to detect it is essential. In this investigation, recombinant PPV VP2 protein was expressed in the Escherichia coli ( E. coli) expression systems. As shown by electron microscopy (TEM), Western blot, and hemagglutination (HA) assays, the recombinant VP2 protein was successfully assembled into virus-like particles (VLPs) after being expressed and purified. These VLPs had a structure that was similar to that of real PPV viruses and also exhibited HA activity. These VLPs induced high levels of PPV-specific antibody titers in mice after immunization, indicating that the VLPs may be beneficial as potential candidate antigens. VLPs were used as the coating antigens for the VLP ELISA, and the PPV VLPs-based ELISA displayed a high sensitivity (99%), specificity (93.0%) and agreement rate (98.3%) compared to HI assay, and the agreement rate of this ELISA was 97.5% compared to a commercial ELISA kit. Within a plate, the coefficient of variation (CV) was 10%, and between ELISA plates, the CV was 15%. According to a cross-reactivity assay, the technique was PPV-specific in contrast to other viral illness sera. The PPV VLP indirect-ELISA test for PPV detection in pigs with an inactivated vaccine showed that the PPV-positive rate varied among different sample sources from 88.2 to 89.6%. Our results indicate that this ELISA technique was quick, accurate, and repeatable and may be used for extensive serological research on PPV antibodies in pigs.

Airway remodeling is a major pathological characteristic of chronic obstructive pulmonary disease (COPD). This study aimed to investigate the effect of Abhd2 deficiency on ovalbumin (OVA)-induced airway remodeling and inflammation in vivo. Abhd2-deficient mice were used to establish an OVA-induced asthma model. Lung tissues were analyzed using hematoxylin and eosin (HE) staining, Masson staining, immunohistochemistry, quantitative reverse transcription- polymerase chain reaction (qRT-PCR), and western blotting were used to determine the role of Abhd2 in the regulation of OVA-induced airway remodeling and inflammation. Our findings revealed that the RNA expression of inflammatory factors, including IL-1β, IL-6, IL-4, and IL-13, was significantly increased in OVA-induced Abhd2 Gt/Gt asthmatic mice. The expression of IFN-γ was decreased significantly in OVA-induced Abhd2 Gt/Gt asthmatic mice. The protein expression of airway remodeling factors, including α-SMA, type I collagen, and Ki67, was also increased in OVA-induced Abhd2 Gt/Gt asthmatic mice compared to that in OVA-induced wild-type (WT) mice. Additionally, Abhd2 deficiency promoted the expression of p-Akt in tissues of the asthma model. These results suggest that Abhd2 deficiency exacerbates airway remodeling and inflammation through the PI3K/Akt pathway in chronic asthma.

Listeria (L.) monocytogenes is the causative agent of human listeriosis, the frequent sourceof which is food of animal origin. The aim of this study was to determine the influence of lactic acid bacteria (LAB) on the viability of Listeria in carrot juice and compound feed inoculated with L. monocytogenes. The effect of homogenous cultures of Streptococcus (Str.) lactis distaticus, Str. thermophilus and Lactobacillus (Lac.) lactis subsp. Cremoris and the combination of Str. thermophilus with Lac. bulgaricus in the carrot juice and compound feed samples on viability of inoculated L. monocytogenes were examined. There were no statistically significant differences in the results between the experimental groups. Regardless of used LAB, the results showed that the mean pH values in the carrot juice samples decreased from an initial pH of 6.7 to a mean value of 3.7 on 15 experimental day. The Listeria concentration in carrot juice samples decreased from average of 4.94 on day 5 to 3.24 log CFU/mL on day 10, and on day 15 achieved <0.01 log CFU/mL. In the compound feed trials, the pH decreased average from initial 6.5 to 3.7 on day 15. The concentration of Listeria decreased, similarly to the carrot juice samples, from average 5.0 on day 5 to 4.68 on day 10, and on day 15 achieved <0.01 log CFU/mL. In control samples, the number of Listeria increased throughout the study period and amounted to 9.2-9.84 log CFU/mL/g in all the samples. The activity of LAB has been shown to be antagonistic to L. monocytogenes. The results of the study did not show any clear differences between the used LAB strains in limiting the L. monocytogenes concentration. Based on the obtained results it can be conducted that the addition of LAB to animal food increases its microbiological safety.

Obesity, which is generally seen in adults, is a serious health problem. Diseases caused by obesity are among the leading causes of death worldwide. Liraglutide (LG) is an analogue of glucagon-like peptide-1, which slows gastrointestinal motility, resulting in decreased food consumption. Gastric plication (GP) and sleeve gastrectomy (SG) is the reduction of stomach volume by surgical means. We examined and compared the body mass index (BMI) changes, metabolic changes and changes in gastric histology in obese rats after LG injection with surgical methods such as SG and GP. In this research, 35 Wistar Albino female rats were used. Rats were divided into 5 groups with 7 rats in each group. Group (G) 1: The control group, fed with a normal calorie diet for 8 weeks. G 2: Sham group, G 3: SG group, G 4: GP group and G 5: LG group, fed with high-calorie feed for 4 weeks. At the end of the 4th week, the study was terminated by making appropriate interventions for the groups. When the blood glucose (BG) levels measured at the beginning, 4th week and 8th week of the experiment were evaluated, it was monitored that the BG level at the 8th week was the lowest in the LG group (p<0.05). It was observed that the preop Ghrelin and Leptin levels of the LG group were lower than those of the SG and GP groups (p<0.05). As a consequenc As a consequence of our metabolic investigations, we observed that the use of LG is at least as effective as SG.

The aim of the current trial was to evaluate the effect of organically chelated zinc - methionin (Zn-Met) supplementation (30 mg Zn /kg DM TMR) on hematological, biochemical, and mineral profile of dairy cows in early lactation (1 - 90 d p.p.). Twenty dairy cows were randomly allocated to one of two dietary treatments in a randomized design. Animals in group C were treated as control (no zinc supplementation); whereas animals in group S were supplemented with organic Zn. Zn-Met supplementation had a significant effect on hematological parameters. White blood cell (WBC) counts 60 days p.p. and red blood cell (RBC) count, hemoglobin concentration (HGB), hematocrit level (HCT) and platelet count (PLT) on calving day, 30th- and 60th- day p.p were significantly higher in cows fed Zn than in the control group. In calves from supplemented mothers, there was a significant increase in RBC (p≤0.001), HCT (p≤0.01) and MCV (p≤0.05). There was no difference in other parameters among the groups, except of the highly significant difference in Zn concentration in blood serum of the S-group during the entire experimental time. The results obtained confirm the beneficial effect on serum zinc level and hematological parameters with no negative effects of 30mg Zn/kg TMR addition on mineral and biochemical parameters.

The aim of this study was to evaluate the effect of benign prostatic hyperplasia (BPH) on nitric oxide (NO) production by spermatozoa and sperm parameters in dogs. The study was conducted on 40 intact dogs of various breeds. The dogs were assigned to two groups: BPH group (n=20) and non-affected group (n=20). The sperm concentration and motility parameters of spermatozoa were assessed using computer-assisted sperm analysis. For the assessment of sperm morphology monochromatic Diff-Quick stain was used. Plasma membrane integrity, mitochondrial membrane potential and the spermatozoa producing nitric oxide and with apoptotic-like changes were determined using fluorescent stain methods. The percentages of motile sperm, sperm with progressive motility and normal sperm were statistically significantly (p<0.05) lower in dogs with BPH than in non-affected dogs. The proportion of sperm in motility subcategory RAPID was statistically significantly (p<0.05) lower in dogs with BPH than in control dogs, whereas in the STATIC motility subcategory the proportion was significantly (p<0.05) higher in dogs with BPH. The percentage of spermatozoa producing NO was significantly (p<0.05) higher in dogs with BPH than in control dogs. In conclusion, the results of this study showed that BPH adversely affects semen quality, especially motility, in dogs. The decreased semen quality was associated with an increased proportion of spermatozoa generating NO. Further research is needed to clarify the mechanisms by which BPH affects semen quality.

The present study aimed to investigate the contamination of poultry feed with aflatoxin B1 and zearalenone at laying hen farms in Tehran suburbs. The poultry feed was selected from five laying hen farms. A total of 60 poultry feed samples were collected from each farm during four consecutive seasons, from spring to winter of 2021. High-performance liquid chromatography was used to determine the amount of aflatoxin B1 and zearalenone. The mean aflatoxin B1 and zearalenone concentrations in various seasons showed significant differences (p<0.01). The highest reported aflatoxin concentration was in winter, with a mean concentration of 1366.53±77.85 ng/kg. The lowest concentrations were reported in autumn and summer, indicating a significant difference (p<0.01). The highest concentration of zearalenone was reported in summer, with a mean concentration of 150.72±10.35 μg/kg. The lowest concentration was reported in winter, with a mean concentration of 22.87±10.35 μg/kg, indicating a statistically significant difference (p<0.01). Overall, the concentrations of aflatoxin B1 and zearalenone toxins significantly differed in various poultry farms. The poultry farm D had the highest aflatoxin contamination with a mean concentration of 648.08±59.89 ng/kg. Poultry farms A, B, and C had the highest zearalenone concentrations with mean concentrations of 125.17±20.61, 96.04±20.61, and 99.49±20.61 μg/kg, respectively. Autumn was the only season showing significant differences regarding zearalenone toxin concentration in poultry farms.

Erythritol (ERT) and L-ascorbyl-2-phosphate (APS) are bacteriostatic, but their effects on staphylococcal skin infections remain unknown. We aimed to determine whether ERT combined with APS inhibits the growth of staphylococci that are commonly isolated from pyoderma skin lesions in dogs. We investigated the individual and combined effects of ERT and APS on the growth of Staphylococcus pseudintermedius, S. schleiferi, and S. aureus using turbidity assays in vitro. Skin lesions from 10 dogs with superficial pyoderma were topically treated with 5% ERT and 0.1% APS for 28 days, and swabbed skin samples were then analyzed using 16S rRNA amplicon sequencing and quantitative real-time PCR (qPCR). Results showed that ERT inhibited S. pseudintermedius growth regardless of harboring the mecA gene, and APS increased the inhibitory effects of ERT against S. pseudintermedius, S. schleiferi, and S. aureus in vitro. Moreover, combined ERT and APS decreased the prevalence of staphylococci on canine skin lesions at the genus level. The combination slightly increased the α-diversity but did not affect the β-diversity of the microbiota. The qPCR results revealed that the combination significantly decreased S. pseudintermedius and S. schleiferi in skin lesions. Topical administration of EPS combined with APS can prevent staphylococcal colonization on the surface of mammalian skin. The results of this study may provide an alternative to systemic antibiotics for treating superficial pyoderma on mammalian skin surfaces.

The number of spermatozoa in the ejaculate is important for its quality and that of the sperm contained in it. The number of ejaculated spermatozoa is also associated with sperm dimensions. The aim of this study was to assess the morphological structure of sperm and the frequency of morphological abnormalities in sperm on the ejaculation performance of boars, measured as the total number sperm per ejaculate. The study was conducted using 648 ejaculates collected from 31 Large White boars and 30 Landrace boars. All ejaculates were analysed for basic physical characteristics and the frequency of sperm with morphological abnormalities. In addition, morphometric measurements of the sperm were made and used to calculate their shape indexes. As a result of our study it was noted that sperm from ejaculates with the most spermatozoa have shorter heads with a smaller area than sperm from ejaculates with a small or intermediate number of spermatozoa. Landrace boars produce semen of better quality, with a smaller percentage of sperm with major abnormalities, and the differences between the breeds increase with the number of spermatozoa in the ejaculate. The sperm from Landrace boars have larger heads and longer flagella than the sperm from Large White boars. The differences in sperm dimensions between breeds decrease as the total number of spermatozoa in the ejaculate increases. The number of spermatozoa in the ejaculate was shown to influence the dimensions of the sperm. The effect of the number of ejaculated sperm on ejaculate characteristics and sperm morphology depends on the breed of the male.

The purpose of this study is to determine the effects of proanthocyanidin (PA) on spermatological parameters and testicular toxicity in male rats exposed to glyphosate (GLP). In our study, four groups were formed out of 24 male rats, each group would include 6 rats. The rats in the PA group were given a dose of 400 mg/kg/day dissolved in DMSO via gastric gavage. The rats in the GLP+PA groups were first given GLP at the LD50/10 dose of 787.85 mg/kg/day, followed by administering PA at a dose of 400 mg/kg/day dissolved in DMSO via gastric gavage. The rats in the GLP group were given GLP at the LD50/10 dose of 787.85 mg/kg/day dissolved in DMSO via gastric gavage. It was determined that in terms of motility, in comparison to the control group, the decreases in the GLP group and the increases in the PA and GLP+PA groups were statistically significant (p<0.001). The administration of GLP increased DNA damage compared to the control group, but the GLP+PA and PA applications reduced DNA damage (p<0.001). The analysis of testosterone levels indicated a statistically significant reduction in the GLP group compared to the other groups. Consequently, it was determined that PA effectively prevented the decreases in the spermatological parameters lowered as a result of GLP exposure and the oxidative stress and toxicity in testicular tissue.