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En el trópico y subtropico a nivel mundial, uno de los principales problemas zoosanitarios que afectan la productividad ganadera, principalmente en bovinos es la garrapata, además trasmiten las enfermedades Anaplasmosis y Babesiosis. El establecimiento de pastos repelentes a la garrapata es un control biológico alternativo para solucionar este problema. Por tanto, el objetivo fue determinar la repelencia en Melinis minutiflora, Andropogon gayanus, Brachiaria brizantha y Cenchrus ciliaris sobre larvas de Amblyomma cajennense. La investigación se realizó en la localidad de Mora, municipio de Tepic, Nayarit, México. Se formaron 24 parcelas de 35 m2 a distancia entre ellas de 1 m, con cinco unidades de muestreo cada una (5 x 1 m de ancho) y pasillos de 0.5 m entre unidades. Las unidades se infestaron con aproximadamente 5,000 larvas de A. cajenennse, el efecto anti-garrapata de los pastos se evaluó mediante la recuperación de larvas adheridas por método de Franela en los tiempos 7, 14, 21 días de post-infestación. Los tratamientos fueron los cuatro pastos descritos con seis repeticiones cada uno. Los resultados fueron analizados por el procedimiento PROC MIXED de SAS y prueba de comparación de medias de Tukey (p

To evaluate the anticoccidial effect of the Hura crepitans seed, 21 cross-breed lambs, 23 ± 3 kg live weight (PV) and 70 ± 6 days old, were used. Animals were housed individually in raised wire-mesh pens, with individual water troughs and feeders. Lambs were randomly divided into three groups (n = 7) that received different doses of Hura crepitans seeds: 4 g/kg B.W. (group 1), 6 g/kg B.W. (group 2) and 0 g/kg B.W. (control group or group 0). The treatment was administered at the beginning of the experiment once orally and the study lasted 21 days. Stool samples were taken for quantitative analysis of oocysts using the McMaster technique and blood for haematological and biochemical analysis. Lambs that received the seeds showed a higher excretion of coccidia oocysts between days 5 and 7 after treatment (p < 0.05) due to the antiparasitic effect of these seeds, without affecting their productive performance (daily feed intake (DFI)- total weight gain (TWG), daily weight gain (DWG)). In addition, the daily feed consumption (DFC) and dry matter intake (DMI) were similar between the groups. The analysed enzymes (ALT, AST, GGT and FA) and creatinine showed reference values. Only the urea and BUN levels were slightly increased, but without statistical difference between the groups. Therefore, the Hura crepitans seed, at doses of 4 and 6 g/kg, favours the expulsion of coccidial oocysts, without affecting either the health or the productive behaviour of lambs.

A study was conducted to investigate the effect of oregano essential oil (OEO) and monensin sodium on the oxidative stability, colour, texture, and the fatty acid profile of lamb meat (m. Longissimus lumborum ). Twenty Dorper x Pelibuey lambs were randomly divided into five treatments; control (CON), monensin sodium (SM, Rumensin 200 ® 33 mg/kg), a low level of OEO (LO, 0.2 g/kg dry matter (DM)), a medium level of OEO (MO, 0.3g/ kg DM), and a high level of OEO (HO, 0.4 g/kg DM). Dietary supplementation of OEO at any concentration lowered the compression strength in comparison with CON and SM. MO had the highest a* values (7.99) and fatty acid concentration (C16:1n7, C18:1n9c, C18:1n6c, C20:1n9, and C18:2n6c) during storage for 7 d at 3 °C. Lipid oxidation was not promoted ( p > 0.05) by the moderated supplementation of oregano essential oil; however, OEO at 0.3 g/kg DM showed a slight lipid pro-oxidant effect. Dietary supplementation of MO and SM had the same effect on colour, tenderness, and the fatty acid profile of lamb ( L. lumborum ). It was demonstrated that oregano essential oil was beneficial for lambs feeding, and it could be a natural alternative to replace monensin in lamb diets with improvements in the quality of the meat.