The presence of pathogens in fecundation hives represents a source of infection for queen bees. The objective of this investigation was to determine the prevalence of Varroa, Nosema, and Acarapis in hives for the production of mating nuclei (HPMN). 239 samples of adult bees of 17 apiaries of a queen bee breeding system were analyzed during the winter and summer of 2016. The prevalence of Varroa and Nosema was higher in winter (79.1% and 55.4%, respectively) than in summer (65.9% and 33.0%, respectively). However, Acarapis was not found. Varroa infestation was 2.55 ± 0.82 mites/100 bees, and Nosema 145 ± 24 × 10³ spores/bee (Standard deviation of the mean). The probability of finding Nosema, in the presence of Varroa, was 3.8 and 1.1 times higher in winter than in summer, respectively. We, therefore, conclude that HPMN has a higher incidence of varroasis and nosemosis during winter and nosemosis increases in the presence of varroasis. We, on the other hand, consider acariosis, absent in the region of study.

The present study evaluates garlic powder (GP) effects on growth performance, feed utilization, gill parasitic treatment, and monogenean diversity. Thus, a trial was performed under controlled conditions with 84 juvenile Nile tilapia, Oreochromis niloticus (39.8 ± 8.8 g initial weight), from culture ponds with monogenean parasite presence for 30 days. Four balanced diets in protein (32.5%) and lipids (6.4%) with GP inclusion levels of 0%, 1%, 2%, and 3% were formulated, manufactured, and supplied daily at approximately 6.5% body weight/tank. The GP diets, compared to the Control (without GP), indicated that the three inclusion levels did not affect the water quality, survival, growth performance, and feed utilization parameters (p > 0.05). No differences were observed in the parasitological index of prevalence (20–25%), mean intensity (9.6–28), and mean abundance (2.7–5.3) among the experimental diets (p > 0.05), evidencing no effect by inclusion level. Efficacy among GP diets indicated a potential decrease in parasite number (13.4–45.6%) but not all monogenean gill parasites. In conclusion, GP diets did not affect the Nile tilapia survival, growth performance, and feed utilization parameters; therefore, its use is suggested as a preventive alternative for monogenean gill parasites.

Revisión del aceite de orégano spp. en salud y producción animal

Las abejas son susceptibles a enfermedades, las cuales causan importantes pérdidas económicas en la actividad apícola. El objetivo fue evaluar la prevalencia de Varroa sp, Nosema sp y Acarapis en apiarios ubicados en dos regiones en Campeche, México. Se evaluaron 116 muestras de abejas de 10 apiarios. La prevalencia de Varroa fue menor en Hopelchén comparada a Sihochac (98.5 % y 100 %), la prevalencia de Nosema fue menor en Hopelchén en comparación a Sihochac (85.9 % y 88.0 %). El nivel de infestación de Varroa fue mayor en Hopelchén en comparación a Sihochac (7.32 y 3.73 ácaros en 100 abejas) sin embargo, el nivel de infestación de Nosema fue menor en Hopelchén en comparación a Sihochac (78x10⁵ y 23x10⁶ esporas por abeja), no se encontró la presencia de Acarapis en ninguna de las regiones evaluadas. En ambas regiones se encontró una correlación positiva entre la presencia de Nosema y Varroa. Existe una probabilidad de 1.08 más alta de encontrar Nosema ante la presencia de Varroa. Concluimos que en ambas regiones existe una alta prevalencia de Varroa y Nosema y no se detectó la presencia de Acarapis. e2022-10 http://dx.doi.org/10.21929/abavet2023.8  https://www.youtube.com/watch?v=F-IAzIEWaps

La pasteurelosis es una enfermedad bacteriana que provoca daños económicos en sistemas de producción cunícola de todo el mundo y es una zoonosis comprobada en humanos infectados por los animales de compañía. El sistema complemento causa la lisis de diversos microorganismos patógenos formando el complejo de ataque a la membrana. El objetivo del presente trabajo fue evaluar la actividad del complemento sérico humano sobre la capacidad de supervivencia de un aislado virulento de Pasteurella multocida tipo A. La bacteria se obtuvo de un caso clínico de una coneja con neumonía, por medio de un hisopado nasal para aislamiento en cultivo puro e identificación por pruebas bioquímicas. P. multocida fue enfrentada por 30 min a 37°C, a suero humano normal y a suero humano inactivado por calor. La lisis por la acción del complemento tuvo una reducción significativa en la viabilidad del microorganismo comparado con el cultivo enfrentado al complemento inactivado (P< 0.05), sin embargo, el 51.07 ± 1.70 % logró evadir la actividad lítica del complemento. En la presente investigación se concluye que el sistema complemento ofrece protección parcial contra infecciones por P. multocida serotipo A causante de pasteurelosis neumónica en conejos. http://dx.doi.org/10.21929/abavet2022.231      e2022-45 https://www.youtube.com/watch?v=KNjfhacdsKQ

This research was conducted to know the effect of 125 mg of recombinant bovine somatotropin (bST) administered at weaning, on the productivity of sheep Pelibuey. 60 clinically healthy ewes with a body condition of 2.5 to 3 were used. The animals were divided into two groups, the treaty (30) and the control (30), at the same time both were subdivided into two groups, the flock that had one parturition (15), and with more than two (15). All females were synchronized under the same scheme of 12 days with an intravaginal sponge, 20 mg of medroxyprogesterone acetate (MPA), and support of 15 mg of PGF2a administered two days before the removal of the sponge. The bST was administered to the treated group the seventh day of synchronization, subcutaneously. Females were mating by the ram, after detection of estrus sinology. At 45 days the pregnancy diagnosis was performed by ultrasound and prolificacy was confirmed at the birth moment. It is concluded that under the conditions in which the experiment was performed bST showed no significant statistical effect in newly weaned females, but it showed minimal gains in the indicators of prolificacy and multiple births in animals treated with Somatotropin.