A study was conducted in 36 farms of the Bogotá Savannah, Ubaté and Chiquinquirá Valleys and Tequendama Region (Cundinamarca), to determine via in vivo egg reduction count test (ERCT) antihelmintics resistance to bovine gastrointestinal nematodes. Resistance was determined in. 40 calves, three to 12 months of age, allotted to four groups of ten animals each one: 1) control (untreated); 2) albendazol 25% (5 mg/kg); ...

In a degraded pasture of the Piedmont of the eastern plains of Colombia, the corn hybrid ‘Master’ was simultaneously established in association with the hybrid grasses Brachiaria cv. ‘Mulato 1’, Brachiaria brizantha cv. ‘Toledo’, andBrachiaria decumbens. Two N rates (100 and 200 kg·ha-1) were evaluated in the development and production of corn grain and grass biomass. N was applied to corn rows 15 and 35 days after the ...

Regular diagnosis of leptospirosis is carried out by the microscopic agglutination test (MAI) which is defined as positive when readings are ≥ 1:100. Since this test only detects antibodies classified as M, it is considered ineffective for acceptable diagnosis in both: individuals or populations. Consequently, the level of infection in swine farms has been underestimated. A methodology was developed to improve reliability ...

Una estrategia para mejorar la salud del tracto gastrointestinal en pollos de engorde es incluir productos novedosos como los aditivos funcionales entre los que se encuentran las levaduras, caracterizadas por su papel beneficioso en la salud animal. En este estudio se evaluó el valor nutricional de tres cepas nativas de levaduras, aisladas de frutales de Colombia. Se utilizaron 240 pollos machos para evaluar los efectos ...

Se evaluó la oferta de pasto kikuyo y ensilaje de avena sobre la producción y calidad composicional de la leche, utilizando 18 vacas Holstein entre 2 y 4 partos en primer y segundo tercio de lactancia con un peso vivo (PV) de 585 kg y una producción de leche de 22,0 L/d. El experimento se realizó en el Centro Agropecuario Marengo de la Universidad Nacional de Colombia. Se evaluaron tres ofertas de ensilaje (materia ...

A wide range of modern anthelmintics, with broad-spectrum and high efficacy to control helminth infections in ruminants, are commercially available, such as benzimidazoles, nicotinic agonist and macrocyclic lactones.The intensive use and inadequated dosages of anthelmintics in ruminants have contributed to develop resistance, becoming the main threat to control endoparasites. Anthelmintic resistance has been reported ...

Expansion of human activities has major impact on the environment, generating changes that must be countered, such as climate change and dispersion of pollutants from industry and agriculture, through strategies that enable the conservation of soil and water reserves. The implementation of strategies with systems approach, covering mathematical simulation models, enables better decision making and a better understanding ...

We describe the development of expressed sequence tags - simple sequence repeats (ESTSSRs) or genetic microsatellites of camu-camu, a small round native fruit of the Amazon rain forest, which that has the highest known amount of natural vitamin C of any plant. Two thousand sequences from a camu-camu ESTs library were analyzed and 219 ESTSSRs were selected for the development of SSRs markers, of which 74.2% were ...

To study the phenotypic variability of a “cherry” collection of tomato of the type in comparison with the vintage tomato cultivar 'Marglobe', an experiment was carried out at “La Selva”, Research Centre of Corpoica, located in Rionegro, Antioquia, at 2,120 masl, with an average temperature of 170C and a relative humidity of 78%. Fifty descriptors were evaluated in this study, 39 were qualitative and l1 quantitative. ...

The study of the clostridiosis in Colombia must be a priority for sanitary authorities due to the sanitary and economic impact caused by these bacteria. Disease clinical signs and symptoms, and effect on animals in good meat condition suppose a high financial impact. This article reviews major research in clostridiosis in recent years, published in scientific and gray literature. Emphasis is made on bovine sudden ...