Iang Schroniltgen Rondón Barragán

Prevalencia de Salmonella spp. en carne porcina, plantas de beneficio y expendios del Tolima

Salmonellosis is an infectious disease whose main clinical manifestation is acute gastroenteritis caused by consumption of contaminated water or food especially meat. The aim of this study was to determine the Salmonella spp. prevalence inside pork and the environment from 6 slaughterhouses and 14 butchers shops all of them selected in Tolima region. A convenience study was realized, choosing slaughterhouses depending on animal reception charge and the good manufacture practices. Sample were obtained (n=507) from environment samples were realized smears on knives, tables, hooks, waste pipes, floors, and transportation trucks. Samples were under microbiologic analysis for Salmonella isolation, which was identified by biochemical and serological test (Poli A +Vi). The results showed a prevalence of Salmonella spp. of 4.93% (25/507). 14 out 25 positives (56%) were isolated from carcass and 11 remaining (44%) were isolated from environment; in slaughterhouses as well as butchers shops. In conclusion, Isolation of Salmonella spp. in post-production phases can be due to cross contamination with environmental fomites in transport as well as in butchers shops and its important for the risk in public health. This is the first time, in the Tolima region that the Salmonella prevalence is known in slaughterhouses and butchers shops.

Resistencia Antibiótica en Salmonella enterica serovar Typhimurium aisladas de granjas porcícolas en el departamento del Tolima

Salmonellosis is a disease caused by bacteria, genera Salmonella, famlily Enterobacteriaceae; which is important in pigs. The presence of Salmonella enterica serovar Typhimurium causes necrotizing enterocolitis and Salmonella choleraesuis causes septicemic form characterized by hepatitis, pneumonia and cerebral vasculitis. Incorrect use of antibiotics, including subdosifying as well as unique therapy and in other cases preventive use of antibiotics has lead to the development of antibiotic resistance. The aim of this work is assess the antibiotic resistance of Salmonella enterica serovar Typhimurium isolated from pig farms at different production steps in the Department of Tolima.

Supplementation with humic substances in laying hens during molt

Humic substances (HS) have been used in the last two decades as a supplement in animal feed to improve performance and physiological processes that are reflected in the quality of products. 120 Hy Line Brown hens were supplemented with HS during the first 60 days of the molting stage. The experimental design was completely randomized. The birds were divided into four groups, each with 30 hens. The first and second groups were supplemented with 0.1 and 0.2% HS, respectively. The third group was supplemented with 0.25 mg/kg levamisole hydrochloride. The fourth group received no supplementation. The effect of humic substances on production parameters and egg quality (laying percentage, daily mortality, feed conversion ratio, shell thickness, albumen thickness, and yolk color) was evaluated. Mortality was not related to the experiment. HS supplementation resulted in no significant differences on hen weight, laying percentage, egg weight, or feed conversion ratio (p> 0.05). However, HS supplementation improved egg quality in terms of increased shell thickness and albumin at days 30 and 60 post-molt.