Se registra el primer caso de una mutación marrón en un individuo de Zenaida auriculata (Columbidae) observado mientras se alimentaba en los corrales de un establo lechero.

Se registra a la golondrina azul y blanca (Pygochelidon cyanoleuca) alimentándose durante la noche de insectos atraídos por luces artificiales. Este comportamiento ha sido observado en pocas especies de aves diurnas y no hay registros previos para esta especie.

Se reporta un inusual sitio de anidamiento para Rhodopis vesper utilizando estructuras artificiales de un fabrica en un medio urbano.

Se reporta la presencia del parche incubatriz en hembras de Forpus xanthops (Periquito cara amarilla) mantenidas en cautiverio.

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 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.

The objective of the present study was to evaluate the somatic cell count (SCC) inraw milk samples contaminated with antibiotics in Arequipa milkshed. A total of 1814 werecollected in summer 2009, and 59 of them resulted contaminated with antibiotics. SCCvalues from contaminated samples were stratified in five levels according to physiologicalstatus and milk quality requirements. The average SCC was 1520 ± 1173 x 10 3 cel/ml.Significant differences were found between levels of SCC (p<0.01).

The aim of the present study was to evaluate the presence of aflatoxin M 1 in raw milk samples from dairy farms of Arequipa milkshed. Milk samples were collected from 10 dairy farms located in the irrigated area of Majes, Santa Rita, La Joya and Lluta districts in two seasons (summer and winter) of 2008. Milk farms were classified as intensive and semintensive according to their productive system. Zero positive milk samples were obtained during the study and therefore, it is concluded that aflatoxin M1 is not a contaminant of fresh milk in the region.

El presente estudio tuvo como objetivo evaluar el recuento de células somáticas (RCS) en muestras de leche fresca contaminadas por antibióticos en la cuenca de Arequipa. Se recolectó 1814 muestras de leche en la estación de verano del año 2009, de las cuales 59 resultaron contaminadas con antibióticos. Los valores de RCS de las muestras contaminadas se clasificaron en cinco rangos de acuerdo a condiciones fisiológicas y requisitos de calidad de la leche fresca. El promedio del RCS fue de 1520 ± 1173 x 103 células/ml, habiendo diferencias significativas entre rangos (p< 0.01).

The aim of the present study was to evaluate the presence of aflatoxin M 1 in raw milk samples from dairy farms of Arequipa milkshed. Milk samples were collected from 10 dairy farms located in the irrigated area of Majes, Santa Rita, La Joya and Lluta districts in two seasons (summer and winter) of 2008. Milk farms were classified as intensive and semintensive according to their productive system. Zero positive milk samples were obtained during the study and therefore, it is concluded that aflatoxin M1 is not a contaminant of fresh milk in the region.

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.

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.