The objective of the present studywas to evaluate the Somatic Cell Count (SCC) in milk in dairy herds of theArequipa region.Milk samples were collected every twoweeks throughout the year 2005 from 15 dairy farms located in the irrigated area ofMajes, Santa Rita, and La Joya districts. Milk farms were stratified according to their technological level as high, medium, and low. The average SCCin the studywas 505 x 103 ± 150 x 103 cel/ ml, and for high, medium and lowtechnological level were 353, 559 y 603 x 103 cel/ml, respectively. Significant differences were found between levels of technology (p<0.05). The study showed an increase in SCC as the level of technology in the herd decreased.

El presente estudio tuvo como objetivo evaluar el recuento de células somáticas (RCS) en establos lecheros de la zona deArequipa. Se recolectaron muestras quincenales de leche en el 2005 de 15 establos lecheros de las irrigaciones deMajes, Santa Rita y La Joya. Los establos se estratificaron de acuerdo a su nivel tecnológico en alta, media y baja. El promediogeneral de células somáticas fue de 505 x 103 ± 150 x 103 cel/ml, y para los niveles tecnológicos de alta,media y baja fueron de 353, 559 y 603 x 103 cel/ml, respectivamente, habiendo diferencias significativas entre niveles tecnológicos (p<0.05). El estudio demuestra un incremento en el número de células somáticas en la leche a medida que disminuye el nivel tecnológico de los establos.

The objective of the present study was to evaluate the frequency of ?-lactams and tetracyclines in raw milk samples contaminated with antibiotics in the dairy area of Arequipa. A total of 616 milk samples were collected in October 2007, and 99 of them were contaminated with antibiotics. Among them, the frequency of samples containing ? - lactams and tetracyclines was 88.8 and 61.6% respectively. The number of samples contaminated with b-lactams was statistically higher as compared to those contaminated with tetracyclines (p<0.01). The study showed that antibiotics belonging to the ?-lactams group are an important source of contamination of milk in the dairy area of Arequipa.

The objective of the present study was to evaluate the frequency of ?-lactams and tetracyclines in raw milk samples contaminated with antibiotics in the dairy area of Arequipa. A total of 616 milk samples were collected in October 2007, and 99 of them were contaminated with antibiotics. Among them, the frequency of samples containing ? - lactams and tetracyclines was 88.8 and 61.6% respectively. The number of samples contaminated with b-lactams was statistically higher as compared to those contaminated with tetracyclines (p<0.01). The study showed that antibiotics belonging to the ?-lactams group are an important source of contamination of milk in the dairy area of Arequipa.