The objective of this study was to determine the prevalence of canine brucellosis (Brucella canis) in two districts of the province of Callao. A total of 456 sera were collected from dogs without distinction of breed, sex and age. Samples were analyzed by the Agar Gel Immunodiffusion (AGID) test using B. ovis antigen. The results indicated that 15.6 ± 3.3 (71/456) of sampled animals were positive. No statistical differences were found due to district, breed, sex or age; however, differences were found (p<0.05) beetween dogs with and without reproductive history (26.5 and 8.6% respectively).

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Rev Inv Vet Perú 108 ABSTRACTA reproductive study was conducted in the El Mantaro valley, Junín, Peru. Forty milking cows from 6 farms were monitored during the rainy season. The effect of breed, parity, milk yield, farm, and technological level on the interval from calving to first ovulation (CFOI), to first service (CFSI), and to conception (CCI) were evaluated. CFOI was determined through progesterone radioimmunoassay concentration in defatted milk. CFOI was within the expected range for dairy cattle (41.2 ± 20.2 days); however, CFSI (118.4 ± 69.2) and CCI (171.3 ± 105.5 days) were too long, possibly due to heat detection failures and nutritional constraints. Farm technological level was the only variable of importance that affected CFSI.Key words:calving to first ovulation interval, calving to first service interval, calving to conception interval RESUMENSe realizó un seguimiento reproductivo en 40 vacas lecheras del valle del Mantaro (Junín, Perú), pertenecientes a 6 establos, durante la época lluviosa. Se determinó el intervalo parto-primera ovulación (IPPO), el intervalo parto-primer servicio (IPPS), y el intervalo parto-concepción (IPC), midiendo el efecto de raza, número de parto, producción de leche, establo y nivel tecnológico. El IPPO se determinó a través de niveles de progesterona mediante radioinmunoensayo en muestras de leche descremada. El intervalo observado entre el parto y la primera ovulación (41.2 ± 20.2 días) estuvo dentro de los rangos esperados para bovinos de producción de leche criados bajo las condiciones del presente estudio. Sin embargo, los intervalos entre el parto al primer servicio (118.4 ± 69.2) y a la concepción (171.3 ± 105.5 días) fueron muy prolongados, debido posiblemente a problemas en la detección del celo y limitantes nutricionales. El nivel tecnológico de los establos fue la única variable de importancia que afectó el intervalo parto-primer servicio.Palabras clave: intervalo parto-primera ovulación, intervalo parto-primer servicio, intervalo parto-concepción