scholarly journals A comparative histological study on the blood film of young and adult, male and female Monkeys (Chlorocebus pygerythrus)

2015 ◽  
Vol 39 (1) ◽  
pp. 112-118
Author(s):  
Amer M. Hussin
Keyword(s):  
Blood Platelets ◽  
Histological Study ◽  
Hematological Parameters ◽  
Blood Film ◽  
Immune Defense ◽  
Vervet Monkeys ◽  
Adult Males ◽  
Humoral Immune ◽  
Chlorocebus Pygerythrus ◽  
Segmented Nucleus

Twenty Vervets monkeys were used to study the effect of sexes and ages on morphohistological and hematological pictures. The study revealed that age and sex affect blood values. Vervet monkeys registered a significant dominancy of hematological parameters in adult males. Erythrocytes of vervet monkeys were of macrocytic type, howell-Jolly bodies were observed. Rouleaux formation, Anisocytosis, Aggregation, and Agglutination were not observed. A significant predominancy of neutrophils in females and lymphocytes in males was recorded. The neutrophil was well defined, large with ring-shaped highly segmented nucleus. Band neutrophils were not observed in peripheral blood.  Eosinophils recorded high values. Circulating leukocytes acted as a transient phase in the functional development of tissue leukocytes. Lymphocytes were the most common cells among leukocytes. Three sizes of lymphocytes and two of monocytes were registered. The value of monocytes percent was higher in males. The herein study declared that blood platelets showing different sizes, shapes and affinities for basic stains and according to these functional affinity, light resting and dark stimulating blood platelets were classified. There was a reverse relationship between the number of erythrocytes and blood platelets among different sexes and ages. In conclusion, the present study hypothesized that blood platelets serve as a supporting cells for blood cells especially erythrocytes. Besides, humoral immune defense in monkeys were well developed.

Pesticides Residues in Blood Serum and Their Adverse Effects on Multi- Biomarkers in Occupationally Exposed Greenhouse Workers: A Cross-Sectional Study in Hamadan City, Iran

2021 ◽  
Author(s):  
Mostafa Leili ◽  
Abolfazl Ghafouri Khosrowshahi ◽  
Jalal Poorolajal ◽  
Fateme Samiee ◽  
Mohammad Taghi Samadi ◽  
...  
Keyword(s):  
Blood Serum ◽  
Crop Production ◽  
Hematological Parameters ◽  
Severe Form ◽  
Mean Corpuscular Hemoglobin ◽  
Adult Males ◽  
Corpuscular Hemoglobin ◽  
Cross Sectional ◽  
Pesticides Residues ◽  
Greenhouse Workers

Abstract The cultivation of greenhouse crops is the most severe form of crop production in Iran, and vast quantities of unreasonable pesticides are being utilized to control pests. The residual level of blood pesticides and its correlation with multi- biomarkers were determined to evaluate the adverse health consequences on greenhouse workers in the Hamdan city of Iran. Participants were 180 adult males, including 90 greenhouse workers exposed to pesticides and 90 control individuals. The residue analyses revealed that 64 out of the 90 workers had residues of dichlorvos, diazinon, and chlorpyrifos in their blood serum; and 56.25% out of these workers were exposed for > 15 years period. The residues of all three pesticides were higher than the no observable adverse effect level (NOAEL) in all the exposure duration categories. Comparisons of hematological parameters showed that mean monocyte (P < 0.001), lymphocyte (P < 0.001) and platelet counts (P = 0.001), mean platelet volume (P = 0.002), and plateletcrit (PCT) (P < 0.001) were significantly higher in workers than in controls, whereas hemoglobin (HB) (P = 0.028), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentrations (MCHC) (P < 0.001) were lower in workers than controls. These results show that exposure to different pesticides was associated with alterations in some biochemical and hematological parameters. Prevention and intervention programs can be effective in eliminating pesticide-related alterations among agricultural workers.

Selective Forces Affecting the Predator Alarm Calls of Vervet Monkeys

Behaviour ◽  
1981 ◽  
Vol 76 (1-2) ◽  
pp. 25-60 ◽  
Author(s):  
Dorothy L. Cheney ◽  
Robert M. Seyfarth
Keyword(s):  
Inclusive Fitness ◽  
Observation Time ◽  
Small Sample ◽  
Calling Behavior ◽  
Alarm Calls ◽  
Vervet Monkeys ◽  
Adult Males ◽  
High Ranking ◽  
Alarm Calling ◽  
Males And Females

AbstractVervet monkeys in Amboseli National Park, Kenya are preyed upon by four types of predator: mammalian carnivores, eagles, baboons, and snakes. Over a 14 month period, adult males and females gave first alarm calls at comparable rates. Both observation on the frequency of alarm-calling and experiments on the duration of alarm-calling indicated that high-ranking adult males and females gave alarm calls more often than low-ranking adult males and females. Individuals who alarm-called most often did not vocalize most often during social interactions, nor did they spend more time than others surveying the habitat around them. There was some tendency, however, for females who alarm-called most often to precede other females in group progressions. Limited evidence suggests that adult males who gave most alarm calls were more likely than other males to have fathered the group's juveniles and infants. Among adult females, however, there was no correlation between number of offspring and frequency of first alarm calls. Females who gave alarm calls most often were not more likely than other females to spend large proportions of observation time more than 2 m from their offspring. Data on a small sample of confirmed predatory attacks suggest that the offspring of high-ranking females may have been more vulnerable than other immatures to predation. Such differential vulnerability may have resulted in part from the tendency of the offspring of high-ranking females to precede other juveniles in group progressions. Vervets of all age/sex classes alarm-called most at those species of predators to which they themselves seemed to be most vulnerable. Adult vervets gave relatively few alarm calls to predators to which their offspring, but not themselves, were vulnerable, even though such alarm calls would have been of low cost to themselves and of great potential benefit to their offspring. While some aspects of the alarm-calling behavior of vervet monkeys are consistent with the hypothesis that their alarms have evolved to benefit kin, in other respects their alarms appear to have the consequence of benefitting only the alarmists themselves. It is likely that both kin and individual selection, acting on an individual's inclusive fitness, have played a role in the evolution of vervet monkeys' alarm calls.

Folic acid and vitamin B12 status of vervet monkeys used for nutritional research

1993 ◽  
Vol 27 (1) ◽  
pp. 59-64 ◽  
Author(s):  
F. S. Venter ◽  
H. Cloete ◽  
J. V. Seier ◽  
M. J. Faber ◽  
J. E. Fincham
Keyword(s):  
Folic Acid ◽  
Inverse Relationship ◽  
Atherogenic Diet ◽  
The Other ◽  
Vitamin B ◽  
Plasma Vitamin ◽  
Vervet Monkeys ◽  
Adult Males ◽  
Competitive Protein Binding ◽  
Apparently Healthy

Plasma and red blood cell (RBC) folic acid levels, as well as plasma vitamin B12 levels were determined in Vervet monkeys ( Cercopithecus aethiops). All the vervets were apparently healthy and without symptoms or lesions typical of folic acid and/or vitamin B12 deficiencies. Competitive protein binding radioassays were used to determine folate and vitamin B12 values in animals fed 4 different diets. The B12 levels for all the groups ranged between 866 and 5867 pg/ml and showed an inverse relationship with the FA measurements. The lowest mean RBC folic acid content in a group fed an atherogenic diet for 3 years was 12·8 ng/ml. For the other 3 diets, mean RBC folic acid levels were 90·7, 132·3 and 152·8 ng/ml, respectively. A megadose of 25·6 mg of folic acid per day for 99 days was given to 3 adult males. No obvious toxic effects were observed in these animals although mean RBC folic acid levels increased to 1013 ng/ml.

scholarly journals Adaptive genetic variation at three loci in South African vervet monkeys (Chlorocebus pygerythrus) and the role of selection within Primates

2018 ◽  
Author(s):  
Willem G Coetzer ◽  
Trudy R Turner ◽  
Christopher A Schmitt ◽  
J Paul Grobler
Keyword(s):  
Genetic Variation ◽  
South African ◽  
Vervet Monkey ◽  
Climatic Conditions ◽  
Primate Species ◽  
Annual Rainfall ◽  
Future Research ◽  
Vervet Monkeys ◽  
Adaptive Genetic Variation ◽  
Chlorocebus Pygerythrus

Vervet monkeys (Chlorocebus pygerythrus) are one of the most widely distributed non-human primate species found in South Africa. They occur across all the South African provinces, inhabiting a large variety of habitats. These habitats vary sufficiently that it can be assumed that various factors such as pathogen diversity could influence populations in different ways. In turn, these factors could lead to varied levels of selection at specific fitness linked loci. The Toll-like Receptor (TLR) gene family, which play an integral role in vertebrate innate immunity, is a group of fitness linked loci which has been the focus of much research. In this study, we assessed the level of genetic variation at partial sequences of two TLR loci (TLR4 and 7) and a reproductively linked gene, acrosin (ACR), across the different habitat types within the vervet monkey distribution range. Gene variation and selection estimates were also made among 11 – 21 primate species. Low levels of genetic variation for all three gene regions were observed within vervet monkeys , with only two polymorphic sites identified for TLR4, three sites for TLR7 and one site for ACR . TLR7 variation was positively correlated with high mean annual rainfall, which was linked to increased pathogen abundance. The observed genetic variation at TLR4 might have been influenced by numerous factors including pathogens and climatic conditions. The ACR exonic regions showed no variation in vervet monkeys, which could point to the occurrence of a selective sweep. The TLR4 and TLR7 results for the among primate analyses was mostly in line with previous studies, indicating a higher rate of evolution for TLR4. Within primates, ACR also showed signs of positive selection, which was congruent with previous reports on mammals. Important additional information to the already existing vervet monkey knowledge base was gained from this study, which can guide future research projects on this highly researched taxon as well as help conservation agencies with future management planning involving possible translocations of this species.

scholarly journals Effect of Parenteral Vaccination of Newborn Holstein Calves against Viral Agents Involved in Bovine Respiratory Disease (BRD)

2020 ◽  
Vol 48 ◽  
Author(s):  
Viviani Gomes ◽  
Diego Daniel Gonzalez ◽  
Karina Medici Madureira ◽  
Marina Valeria Mozgovoj ◽  
Camila Costa Baccili ◽  
...  
Keyword(s):  
Inflammatory Response ◽  
Respiratory Disease ◽  
Management Practices ◽  
Immune Defense ◽  
Maternal Antibodies ◽  
Control Group ◽  
Humoral Immune ◽  
Unvaccinated Control ◽  
Holstein Calves ◽  
Newborn Calves

Background: Newborn calves are born immunosuppressed, hypogammaglobulinemic, immunologically immature, and therefore more vulnerable to many infectious diseases. During pregnancy, the fetal-placental environment is regulated by Th2-type cytokines that neutralize Th1 responses, an important factor for immune defense against viral agents. The ingestion and absorption of colostral immunoglobulins enhance the immunity of the neonate. However, the presence of maternal antibodies might negatively affect the success of parental vaccination in the first two months of life. This study aimed to evaluate the effecacy of parenteral vaccination in newborn calves with high titers of maternal antibodies against respiratory viruses.Materials, Methods & Results: Twenty-eight Holstein calves were allocated to the vaccinated group (VAC, n = 18) or an unvaccinated control group (NVAC, n = 10). The initial vaccination with 5 mL of a commercial vaccine occurred around the 14th day of life (D14) and the booster at D35. Respiratory and diarrhea symptoms were evaluated at D12, D14, D16, D20, D31, D36, D45, D53, and D60. Blood samples were taken for leukogram, haptoglobin, and seroneutralization of BVDV, BoHV-1, BRSV, and BPI3V, at the time of vaccination at D14 (T1), at booster (D35, T2), and 21 days after the booster (D56, T3). Despite the increased prevalence of BRD during the period of the study, no calves from either group exhibited respiratory disease at D12 or D14. In subsequent assessments, the frequency of BRD increased over time in the VAC group until it reached a maximum prevalence of 38.9% (7/18) at D31. In the NVAC group, the maximum prevalence observed was 40% at D45 and D60. A comparison of the frequencies for BRD cases showed a statistical trend at D36 (P = 0.07), with a higher prevalence for the NVAC group (30%) in relation to the VAC group (5.6%). For the NVAC group, a greater number of total leukocytes was observed at T3 (P = 0.038) and granulocytes (trend) at T2 (P = 0.066). Time analysis demonstrated a decrease in haptoglobin concentration in both groups (NVAC, P = 0.005 and VAC, P = 0.006), with a reduction in the values at T1 and T3 (NVAC = 0.005 and VAC = 0.024). Antibody titers were similar between groups for BVDV, BoHV-1, and BRSV. Higher titers for BPI3V were observed for the VAC group at D56 (P = 0.045).Discussion: The early-onset BRD was present in both groups between 30 and 60 days of age, based on the higher prevalence observed. These data reinforce the importance of early immunization programmes before infection. Factors such as management practices and facilities may have also contributed to the higher prevalence of BRD. The increased number of leukocytes and neutrophils at T2 (D35) and T3 (D56) in the NVAC group points to a stronger inflammatory response to various types of potential challenges. The inflammatory leukocyte profile explains the higher haptoglobin values observed in the NVAC group at T2 (D35). The similarity of titers of antibodies against BVDV, BoHV-1, and BRSV between groups may indicate that vaccinating the calves at 14 days of age did not induce a humoral immune response to these viruses, likely due to interference from the maternal antibodies. Early vaccination prevented a drop in specific viral antibodies and promoted partial protection for vaccinated calves around 14 days of age, with a decrease in the intensity of the inflammatory response at the peak of the disease and a higher concentration of antibodies against BPI3V after the booster.

scholarly journals Social contact behaviors are associated with infection status for whipworm (Trichuris sp.) in wild vervet monkeys (Chlorocebus pygerythrus)

2020 ◽  
Author(s):  
Brandi Wren ◽  
Ian S. Ray ◽  
Melissa Remis ◽  
Thomas R. Gillespie ◽  
Joseph Camp
Keyword(s):  
Direct Contact ◽  
Sickness Behavior ◽  
Gastrointestinal Parasites ◽  
Physical Contact ◽  
Parasitic Infections ◽  
Vervet Monkeys ◽  
Infection Status ◽  
Social Grooming ◽  
Mammal Species ◽  
Chlorocebus Pygerythrus

AbstractSocial grooming in the animal kingdom is common and serves several functions, from removing ectoparasites to maintaining social bonds between conspecifics. We examined whether time spent grooming with others in a highly social mammal species was associated with infection status for gastrointestinal parasites. Of six parasites detected, one (Trichuris sp.) was associated with social grooming behaviors, but more specifically with direct physical contact with others. Individuals infected with Trichuris sp. spent significantly less time grooming conspecifics than those not infected, and time in direct contact with others was the major predictor of infection status. One model correctly predicted infection status for Trichuris sp. with a reliability of 95.17% overall when the variables used were time spent in direct contact and time spent grooming others. This decrease in time spent grooming and interacting with others is likely a sickness behavior displayed by individuals with less energy or motivation for non-essential behaviors. This study highlights the need for an understanding of a study population’s parasitic infections when attempting to interpret animal behavior.

scholarly journals IDIOPATHIC THROMBOCYTOPENIA IN DOGS - CASE REPORT

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Goran PARAŠ ◽  
Smiljana PARAŠ ◽  
Bojan LUKAČ ◽  
Igor ČEGAR ◽  
Ognjen VITKOVIĆ
Keyword(s):  
Differential Diagnosis ◽  
Case Report ◽  
Autoimmune Diseases ◽  
Blood Platelets ◽  
Hematological Parameters ◽  
Small Animal ◽  
Behavioral Changes ◽  
Blood Tests ◽  
Pathological Conditions ◽  
Frequent Monitoring

Thrombocytopenia represents a significant reduction in number of blood platelets in thecirculation of mammals. The causes of thrombocytopenia in dogs and cats are: various infectiousfactors, viruses, bacterias, parasites, various pathological conditions of the liver, spleen, bonemarrow or autoimmune diseases. Sometimes, thrombocytopenia causes many different factors orthe real cause can not be detected, and its origin is called idiopathic. In our practice, in the course ofhaematological analysis of blood, we encounter a reduced number of platelets in the blood of dogsand cats. Then we are facing the great challenge of diagnosing and treating possible idiopathicthrombocytopenia in animals.In our case, we have a Miniature poodle whose problems began at the age of 2.5. The dog had thefollowing symptoms: inapetency, somnolence, temperature of 38.80C, pale oral mucosa withpetechiae and behavioral changes. After the first hematological blood tests were performed, theresults of the parameters indicated thrombocytopenia in this dog. Diagnosis of the disease issupported by symptoms and differential diagnosis, so we started with frequent monitoring ofhaematological parameters.We included adequate therapy with the first symptoms of the disease in our case of idiopathicthrombocytopenia in a young dog. The therapy was successful, hematological parameters and thequality of life improved, and the dog is now eight years old. The treatment of idiopathicthrombocytopenia is a challenge for every small animal veterinarian and for this reason in this paperwe share our experiences with colleagues.

scholarly journals Predatory Behavior of Yellow Baboons

Behaviour ◽  
1976 ◽  
Vol 56 (1-2) ◽  
pp. 44-67 ◽  
Author(s):  
Glenn Hausfater
Keyword(s):  
Prey Item ◽  
Prey Species ◽  
Predatory Behavior ◽  
Primate Species ◽  
Papio Cynocephalus ◽  
Vervet Monkeys ◽  
Adult Males ◽  
Lepus Capensis ◽  
Number Of Individuals ◽  
Prey Items

Abstract1. A group of 32 yellow baboons (Papio cynocephalus) in the Masai-Amboseli National Park, Kenya, caught and ate 45 vertebrate prey items during 2519.19 hours of observation. 2. Eighty percent of the prey items were mammals and the most frequently eaten species were African hares (Lepus capensis), vervet monkeys (Cercopithecus aethiops) and neonate gazelle (Cazella granti and G. thomsoni) in that order. The details of predatory behavior for each prey species are described. 3. Rates of predation were significantly higher during the long dry season than during other months of the year, although no correlation was found between total monthly rainfall and monthly rates of predation. A lognormal model however provided a good fit to the monthly rate of predation data suggesting that the rate of predation by Amboseli baboons was affected by several factors that acted multiplicatively with respect to each other and were themselves related to rainfall or dryness. 4. A mean of 2.3 individuals fed directly from the carcass of each prey item. A mean of 3.5 individuals per prey item fed directly or indirectly, i.e., on scraps, from each carcass. In general, both the number of individuals who fed from each carcass and the duration of their feeding bouts was dependent upon the gross body size of the prey item. Adult males fed directly from the carcass of prey items for about three times more minutes than expected from their number in the group; other classes of individuals fed directly from prey carcasses for only one-fourth as many minutes as expected. In general, an adult male would be expected to feed on each category of vertebrate prey at least once per year, while individuals of all other age-sex classes would be expected to feed on most prey categories only once every two years. 5. The most frequent social behavior around prey items was agonistic bouts; no cooperation, simultaneous feeding or specific begging gestures were observed. 6. Estimates of the total number of prey killed annually by Amboseli baboons indicate that baboon predation probably has a negligible effect on prey populations other than vervet monkeys. 7. It is speculated that the need for vitamin B12 underlies baboon predatory behavior, and perhaps that of other primate species as well.

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