Teódulo Quezada

Teódulo Quezada
Autonomous University of Aguascalientes | UAA · Departamento de Clínica Veterinaria

Doctor of Veterinary Medicine

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70
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537
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Publications

Publications (70)
Article
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Crops contamination with aflatoxins (AFs) and zearalenone (ZEA) threaten human and animal health; these mycotoxins are produced by several species of Aspergillus and Fusarium. The objective was to evaluate under field conditions the influence of the wet season on the dissemination of AF- and ZEA-producing fungi via houseflies collected from dairy f...
Preprint
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Neospora caninum and Toxoplasma gondii are among the foremost causes of reproductive issues in sheep. The purpose of this study was to ascertain the influence of environmental factors associated with N. caninum and T. gondii infections in breeding ewes from western Mexico. A total of 184 blood samples were collected from breeding ewes to determine...
Article
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Background The Harris hawk is a bird of prey susceptible to traumatic injuries because it is useful for several purposes such as conservancy, biological control and falconry. Once received in rehabilitation centres or specialized clinics, it is necessary to provide proper analgesia. Objectives The aim of this study is to demonstrate the analgesic...
Article
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Commercial dry food (CDF) for dogs is a whole grain ration thoroughly mixed and die-cut with heat and pressure to give it the shape of kibble. CDF is formulated with several agroindustrial ingredients and by-products of agricultural and livestock origin. Contamination by Aspergillus flavus and aflatoxins (AFs) in foods has been shown to be a global...
Article
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El alimento comercial seco (ACS) para perro es una ración integral completamente mezclada y troquelada con calor y presión para darle forma de croqueta. El ACS está formulado con diversos ingredientes y subproductos agroindustriales de origen agrícola y pecuario. La contaminación por Aspergillus flavus y por aflatoxinas (AFs) en los alimentos se ha...
Article
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The present study aimed to analyze the antioxidant and hepatoprotective efficacy of watercress extract against liver fibrosis induced by CCl4 (0.8 mL/kg, i.p) in an in vivo rat model. Four groups were included, each with five animals (n = 5): 1) Intact, 2) CCl4-induced for 4 weeks, 3) CCl4-induced for 8 weeks, and 4) CCl4-induced for 4 weeks follow...
Article
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MACÍAS, M. O.; GUERRERO, B. A. L.; VALDIVIA, F. A. G.; QUEZADA, T. T.; AVELAR, G. F. J.; SOTO, P. M. M. & DE SANTIAGO, A. S. Study of ex-ovo embryonic development of Gallus gallus domesticus. Int. J. Morphol., 41(2):668-674, 2023. SUMMARY: The domestic chicken is a species of bird that has been extensively studied in regard to its biology and as a...
Article
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Objetivo. Identificar la prevalencia de la infección por parásitos digestivos (PD) y su distribución estacional en perros de Aguascalientes, México. Materiales y métodos. Se examinó una muestra estadísticamente representativa (n=927), seleccionada sistemáticamente (primero de cada 10), de perros vagabundos o entregados voluntariamente por sus propi...
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Red blood cells (RBC) morphologic evaluation through microscopy optical (OM) and SEM, provides information to forecast, evaluate, and monitor the functioning of many organs. Factors, such aging and diseases affect RBC morphology in both, human and animals. SEM is useful to evaluate RBC morphology, although its use in diagnosis and evaluation in dog...
Article
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The objective of the study was to analyse the prevalence of infection by N. caninum and T. gondii in breeding ewes from central western Mexico. For this purpose, 184 blood samples were collected from sheep in the reproductive stage, which were analysed by ELISA and PCR tests, respectively, and the association between seroprevalence and some managem...
Article
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Aspergillus species can produce aflatoxins (AFs), which can severely affect human and animal health. The objective was to evaluate the efficacy of reducing AF contamination of a non-aflatoxigenic isolate of A. flavus experimentally coinoculated with different aflatoxigenic strains in whole plant (WP), corn silage (CS), immature grains (IG) and in c...
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p class="Default"> Background. Propylene glycol has been used successfully since the 1950’s for him acute and prophylactic treatment of ketosis in dairy cows however; its use has been poorly evaluated in beef cattle and meat sheep. Objective . Evaluate the effects of different doses of propylene glycol on the productive parameters, blood metabolite...
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Contamination of food chains by toxigenic fungi and aflatoxins is a global problem that causes damage to human health, as well as to crop and livestock production. The objective is to evaluate Aspergillus flavus and total aflatoxins (AFs) occurrence in totally mixed rations (TMRs) for dairy cows and aflatoxin M1 (AFM1) in milk for human consumption...
Book
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De acuerdo con la declaración del 27 de abril de 2020 de la Organización Mundial de la Salud (OMS), el 31 de diciembre de 2019 se confirmó la presencia de un nuevo coronavirus, causante de múltiples casos de neumonía en la ciudad de Wuhan, China. Por su propagación y gravedad, el 11 de marzo de 2020 la OMS declaró que se había alcanzado el nivel de...
Article
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Antecedentes: Monascus ruber es un hongo utilizado en la industria alimentaria como un pigmento natural principalmente en los países asiáticos, sin embargo se ha descubierto que produce una micotoxina llamada citrinina, la cual ocasiona hepatotoxicidad, teratogenicidad, tumores, mutaciones, esto es causante de enfermedades y muerte en humanos y ani...
Article
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Background Blood biochemistry and reference intervals help to differentiate between healthy and ill dogs as well as to provide information for the prognosis, evaluation, and monitoring; however, these intervals are often obtained from adult animals. It is essential to understand that puppies and adults are physiologically different, which justifies...
Article
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Neospora spp. es un parásito protozoario causante de abortos y enfermedad del Sistema Nervioso Central (SNC) en diversas especies domésticas y silvestres. En equinos, se le ha involucrado como causa de aborto, mortalidad neonatal y enfermedades del SNC. La especie identificada en equinos es distinta a Neospora caninum y se denomina Neospora hughesi...
Article
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Contamination of agricultural and livestock products with aflatoxins (AF) is distributed worldwide. AFs are toxic, carcinogenic, and immunosuppressive; however, in Mexico, there is little information about Aspergillus flavus, the main fungus that produces them. The objective was to characterize the molecular and morphological, aflatoxigenic isolate...
Article
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With the objective of identifying the presence of Paratuberculosis (PTB), an infectious disease caused by Mycobacterium avium subsp paratuberculosis (MAP), in sheep, through pathological studies, bacterial culture and IS900 PCR, as well as estimating seroprevalence to MAP. The present cross-sectional study, was conducted in 16 different flocks, wit...
Article
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Since its first patent (1897), commercial dry feed (CDF) for dogs has diversified its formulation to meet the nutritional needs of different breeds, age, or special conditions and establish a foundation for integration of these pets into urban lifestyles. The risk of aflatoxicosis in dogs has increased because the ingredients used to formulate CDF...
Article
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Aflatoxins (AF) are potent mycotoxins with carcinogenic, teratogenic, and mutagenic potential. There is no agreement on the safe AF maximum residue levels established in different countries (5.0 to >20.0 μg/kg) to avoid feed toxicity in dairy cows and to protect the food chain. The objective was to establish a diagnosis of subclinical aflatoxicosis...
Preprint
Full-text available
Background: Blood biochemistry and reference intervals help to differentiate between healthy and ill patients as well as to provide information for the prognosis, evaluation, and monitoring of a patient; however, these intervals are often obtained from adult animals. It is essential, hence, to understand that puppies and adults are physiologically...
Article
Full-text available
La contaminación de productos agrícolas y pecuarios con aflatoxinas (AF) está distribuida mundialmente. Las AF son tóxicas, inmunodepresoras y carcinogénicas, pero en México es escasa la información sobre Aspergillus flavus, principal hongo que las produce. El objetivo fue caracterizar morfológica, molecular y aflatoxigénicamente aislados de A. fla...
Article
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Monascus purpureus is used in the food industry as a natural pigment, mainly by Asian countries; however, this fungus produces a mycotoxin called citrinin, which causes diseases such as hepatotoxicity, teratogenicity, tumors and mutations, in mammals. This fungus was found in Serbia in corn and lucerne silage. The objective of this work was to iden...
Article
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Es necesario explorar fuentes de proteína alterna para adicionar a la alimentación de aves en regiones rurales. Son contados los estudios realizados en moringa para este propósito. Se determinó el análisis proximal, el contenido de Fe, Ca y taninos a la harina de hoja de moringa. Se evaluó el efecto del consumo de una dieta con 10 % de harina sobre...
Article
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The objective was to determine the effect of black tuna meal (BTM) at different concentrations and time of addition, in chicken diets on production variables, quality, and concentration of fatty acids in eggs and sensory evaluation. A 3 x 4 factorial design was used. Increasing the concentration of BTM modified the production variables. The cholest...
Article
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Se evaluó la calidad nutricional y potencial uso del bagazo de manzana (BM) en dietas para rumiantes al ser ensilado (microsilos) con dos fuentes nitrogenadas (FN) [urea (U), cerdaza (C)], un inoculante comercial (I) y Chloris gayana como adherente de humedad [80/20 peso/peso, materia seca (MS)]. El estudio se realizó en Aguascalientes, México (201...
Article
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Background This work studied the natural infection of Neospora caninum during the first gestation of heifers in a dairy farm in animals consuming a ration co ntaminated naturally with Zearalenone (ZEA), and to find out effect of mycotoxin in the levels of estrogen (E) and progesterone (P4) and that‘s relation to the infection to N. caninum and in t...
Article
The aim of the present study was to investigate the antidiabetic potential of aqueous chaya extract (Cnidoscolus spp.) in streptozotocin-induced diabetic rats. Compounds identified and quantified included flavonoids and phenolic acids, in addition to saponins and alkaloids, among others. Several new phenolic compounds (coutaric, vanillic, and rosma...
Article
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The aim of this study was to identify the prevalence of and certain risk factors associated with infection by Cryptosporidium spp. in suckling calves that were maintained in confinement in three dairy farms in Aguascalientes, Mexico. Over a period of 12 months, 1658 fecal samples were taken from 0- to 28 day-old calves. These samples were processed...
Article
Full-text available
The aim of this study was to identify the prevalence of and certain risk factors associated with infection by Cryptosporidium spp. in suckling calves that were maintained in confinement in three dairy farms in Aguascalientes, Mexico. Over a period of 12 months, 1658 fecal samples were taken from 0- to 28 day-old calves. These samples were processed...
Article
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El objetivo fue identificar la prevalencia y algunos factores de riesgo asociados a la infección por Cryptosporidium spp. en becerras lactantes mantenidas en confinamiento en tres establos lecheros de Aguascalientes, México. Durante 12 meses se recolectaron 1658 muestras fecales de becerras de 0 a 28 días de edad, que se procesaron mediante frotis...
Article
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Background In any calf rearing system it is desirable to obtain healthy animals, and reduce morbidity, mortality, and economic losses. Bovine syndesmochorial placentation prevents the direct transfer of bovine immunoglobulins to the fetus, and calves are born hypogammaglobulinemic. These calves therefore require colostrum immediately after birth. C...
Article
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Aspergillus flavus maize colonization leads to crop contamination by toxic secondary metabolites and carcinogens called aflatoxins (AF); it has negative effects in public health and has caused economic losses in agricultural activities. Eleven genotypes of immature maize grain frequently used in Mexico were inoculated in vitro with two indigenous t...
Article
The purpose of this study was to detect the presence of Neospora caninum in tissues from wild rodents associated with dairy farms in Aguascalientes, Mexico. Individuals from Mus musculus, Rattus novergicus and Spermophilus variegatus were caught in dairy farms with history of positive status to N. caninum. A total of 33 rodents were caught from whi...
Article
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The objective of this study was to compare the effects of two fibrolytic enzyme mixtures (Fibrozyme and Promote) on growth performance, digestion and ruminal fermentation in lambs fed corn stover based diets. Forty-two crossbred (Black Belly×Dorper) lambs (20±1.6 kg) were randomly assigned to three treatments defined as Control (no enzymes), Fibroz...
Article
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Aflatoxins (AF) have a high impact in both human and animal health, causing significant economic losses in the poultry industry, especially by diminution of avian growth, feed efficiency, and product quality. Aflatoxins affect the whole organism, particularly liver and kidney. The objective of this study was to evaluate renal function alterations i...
Article
La carrera del Médico Veterinario Zootecnista (MVZ) es tal vez una de las más extensas y complejas que existen. Los Médicos Veterinarios Zootecnistas tienen su campo de acción en áreas tan variadas que su preparación académica y profesional requiere de un enorme abanico de conocimientos, habilidades y aptitudes.
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The Karwinskia humboldtiana (Kh) is a toxic plant to human and cattle. In this work, we analyzed its noxious effects on the liver and blood coagulation. For this, we administered a suspension of Kh seeds (1.25 g/kg, oral) to male Wistar rats and three days after intoxication: increased the plasmatic activities of ALT and AST (27 and 33 fold respect...
Article
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The objective of this study was to estimate the risk infection of cryptosporidiosis in dairy calves from Aguascalientes, Mexico, in relation with the season and months of sampling. During a period of 12 months, fecal samples were collected every 14 days, which were processed by Kinyoun staining of fecal smears. Seasonal distribution of Cryptosporid...
Article
The Karwinskia humboldtiana (Kh) is a toxic plant to human and cattle. In this work, we analyzed its noxious effects on the liver and blood coagulation. For this, we administered a suspension of Kh seeds (1.25 g/kg, oral) to male Wistar rats and three days after intoxication: increased the plasmatic activities of ALT and AST (27 and 33 fold respect...
Article
Fumonisins are micotoxins mainly produced by Fusarium verticillioides, which usually contaminate corn and sorghum grains representing a serious animal health risk. Two fumonisin adsorbents were assayed in broiler diets experimentally contaminated with fumonisin B1 (FB1). To this aim, 162 Ross male chicken average weight 44 ± 1.2 g were randomly dis...
Article
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La Los avestruces tienen capacidad para digerir la fibra de los alimentos, pero no se han realizado estudios sobre la utilidad de incluir ingredientes de uso común en México, en la formulación de raciones integrales. Con el objetivo de evaluar la digestibilidad aparente (DA) o proporción en que son retenidos los nutrientes de los alimentos, se form...
Article
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Ostriches can digest feed fiber; however, the usefulness of including forages common in Mexico in complete diets for this specie is unknown. The objective of the present study was to evaluate the proportion in which nutrients of complete diets which include corn silage (CS) were in fact digested. All diets (CS: A: 0.00, B: 10.0, C: 20.0 and D: 30.0...
Article
The aim of this study was to determine by nested PCR probe the presence of Neospora caninum in fetal brain tissue from aborted dairy fetuses in Aguascalientes, a state in the central part of Mexico. Forty-four fetal brains from eight dairy farms were analyzed using single tube nested PCR probe with primers NF1, NS2, NR1 and SR1, with histopathology...
Article
Our previous acute toxicity studies with Karwinskia humboldtiana (Kh) in rats showed renal hemodynamic changes with a marked increase in the fractional excretion of sodium and morphological damage. To analyse the effects of Kh or 'tullidora' on energetic metabolism, a single dose of an oral preparation from the seed fruits was given to Wistar rats...
Article
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The physical development of muscle, bone, and blood in pigs fed diets containing different forms of tortillas was evaluated. The tortilla products included corn tortillas (TN), TN with a mixture of 0.15% vitamins and minerals (TNV), TN with 4% (as is) defatted soy paste (TNS), corn flour tortillas (TH), TH with vitamins (THV), and TH with soy paste...
Article
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The objective of this study was to prove that the dietary supplementation of elagic acid (AE) or N-Acetylcysteine (NAC), attenuate the effects of an acute intoxication by aflatoxin B1 (AFB1). Three groups (ten chickens each one) were intoxicated by pure AFB1 (3.0 mg/kg BW, IP), and another three groups only received the vehicle (corn oil 2.0 mL/kg...
Article
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El objetivo de este estudio fue comparar la concentración de proteínas (CP), trifosfato de adenosina (ATP) y el glutatión reducido (GSH), así como las actividades enzimáticas específicas de transferasa de glutatión (AEE TG) y gammaglutamiltransferasa (AEE-GGT), en homogeneizados de hígado y riñón de pollos y ratas. Debido a que estos procesos se en...
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N-acetylcysteine (NAC) has been used safely in humans and in other mammals as an antidote against several toxic and carcinogenic agents, including aflatoxin B1 (AFB1). The aim of this study was to evaluate the capability of dietary supplementation with NAC to ameliorate the effects of subacute intoxication with AFB1 in broiler chickens. One hundred...
Article
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Aflatoxin B(1) (AFB(1)) negatively affects chicken (Gallus domesticus) growth. This effect is more severe during development. We studied the influence of age on the toxic effects of AFB(1) on plasma, renal and hepatic enzymes, under two protocols, in adult and in developing Arbor-Acres chickens. Protocol A: 100 male 4-week-old chickens (640 g), rec...
Article
Full-text available
Ostriches can digest feed fiber; however, the usefulness of including forages common in Mexico in complete diets for this specie is unknown. The objective of the present study was to evaluate the proportion in which nutrients of complete diets which include corn silage (CS) were in fact digested. All diets (CS: A: 0.00, B: 10.0, C: 20.0 and D: 30.0...
Article
Full-text available
The objective of this study was to compare protein concentration (PC), adenosine 5'-triphosphate (ATP) and reduced glutathion (GSH), as well as the specific enzymatic activities of transferase of glutathion (SEA-TG), and gamma-glutamyl-transferase (SEA-GGT) in liver and kidney homogenates of broilers and rats. Due to the fact that these processes a...

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