1994, Number 4
Evaluation of the bacteriological quality of water to supply slaughterhouses of Mexico City
Language: English/Spanish
References: 20
Page: 349-352
PDF size: 563.71 Kb.
Text Extraction
A study of water samples (n = 150) from the four slaughterhouses (Iztapalapa, Milpa Alta, Ferreria and Topilejo) in Mexico City and suburbs was done in order to evaluate their bacteriological quality. In the three first slaughterhouses a census was made including all the water faucets, however in Ferreria it was necessary to establish a sample size. All specimen water intakes must have had to fulfill with the preestablished inclusion criteria. Samples were analized through the Most Probable Number Technique (MPN) and Standard Count (SC), established by the National Public Health Laboratory of the Health Secretary of Mexico. All samples studied in the slaughterhouses had MPN and SC values higher than those allowed in Mexican sanitary regulations. Percentages of bacterial contamination found in the slaughterhouses regarding MPN and SC were the following: Iztapalapa, 77.8% and 66.7%; Milpa Alta, 37.5% and 6.2%; Ferreria, 35.6% and 5.7% and Topilejo, 27.3% and 4.6%, respectively. All results were subjected to the Ji test trying to evaluate the distance influence between the main water tank and the water intake on their water bacteriological quality. Similarly, MPN and SC values, found in the slaughterareas, were compared. Furthermore, in Ferreria, slaughter-areas, as well as guts of different animal species were compared. There were no significant differences (P ‹ 0.05) in none of the cases. The absence of proper sanitary control and the particular hygienic conditions of each working area in the slaughterhouses studied, determine the water bacteriological quality in the main water tank and in the water faucets. The degree of contamination found is a public health risk, and it could also cause financial problems, therefore, this should be evaluated.REFERENCES
Michanie, S. y Quevedo, F.: Aplicación del enfoque análisis de riesgo y determinaciones de puntos críticos de control (ARPCC) en el mejoramiento de la calidad e inocuidad de los alimentos. Memorias del Curso: Análisis de Riesgo y Determinación de Puntos Críticos en la Preparación de Alimentos. México, D.F. 1989. 1-5. OPS-CEPANZO-S.S. México, D.F. (1989).
Pérez, J.: Estudio bacteriológico de las aguas negras del gran canal del desagüe de la ciudad de México y de los distritos de riego 03 y 88 en los estados de Hidalgo y México respectivamente y su posible repercusión sobre la productividad del ganado. Tesis de licenciatura. Fac. de Med. Vet. y Zoot. Universidad Nacional Autónoma de México. México, D.F., 1978.
Portillo, G.: Evaluación de la calidad sanitaria del agua de los centros de producción pecuaria del Valle de México pertenecientes a la Facultad de Medicina Veterinaria y Zootecnia de la UNAM. Tesis de licenciatura. Fac. de Med. Vet. y Zoot. Universidad Nacional Autónoma de México. México, D.F., 1986.