The effect of a probiotic formula containing a consortium of actinomycetes on the productive performance and intestinal integrity of broiler chickens from 1 to 28 days of age reared in experimental batteries was evaluated. A total of 320 male Cobb 500 chickens were used, randomly distributed in four treatments with eight repetitions and ten chickens per repetition: T1, basal diet (without growth promoters); T2, basal diet + growth promoters (tylosin 200 g/t, salinomycin + nicarbazin 500 g/t); T3, basal diet + Bacillus subtilis (100 g/t); T4, basal diet + actinomycetes consortium (100 g/t). At 21 and 28 days of age, eight birds per treatment were slaughtered to assess intestinal integrity (intestinal histomorphometry) and relative organ weight. At 14 days of age, the actinomycetes consortium significantly improved feed conversion versus the group receiving a basal diet (p<0.05) and had...

The role of Cryptosporidium parvum as a risk factor for the occurrence of neonatal diarrhea was evaluated using a case-control study design in alpacas from Puno. The study was carried out during the calving season, between February and March 2006. Stool samples (n=487) were collected in alpacas of 1 to 15 days of age in four localities: Antacalla, La Raya, Quimsachata and Macusani. The faecal smears were processed following the Modified Ziehl-Neelsen stain. The 39% (130/336) of alpacas with diarrhea and 23% (35/151) of alpacas without diarrhea were positives to C. parvum infection. The logistic regression showed that this parasite does not represent a risk factor for neonatal diarrhea in the screened animals (OR: 1.5, IC 95%: 0.9-2.4). It was also determined that La Raya was statistically significant (p=0.046) and represented a risk factor for the occurrence of neonatal diarrhea (OR: 2.5...

El presente trabajo evaluó en campo el rol del Cryptosporidium parvum como factor de riesgo en la presentación de diarrea neonatal empleando el diseño epidemiológico de Caso-Control en alpacas del departamento de Puno. El muestreo se realizó durante la temporada de parición, entre los meses de febrero y marzo de 2006. Se recolectaron muestras fecales (n=487) de alpacas entre 1 a 15 días de edad procedentes de las localidades de Antacalla, La Raya, Quimsachata y Macusani. Los frotis fecales, fijados previamente en metanol, fueron procesados según la técnica de tinción de Ziehl-Neelsen Modificado. El 39% (130/336) de los animales con diarrea y el 23% (35/151) de las que estaban sin diarrea fueron positivos a la infección por C. parvum. El análisis de regresión logística demostró que no hubo relación estadística significativa entre la presencia de Cryptosporidium y la diarr...

The efficacy in the control of coccidiosis of the anticoccidial combination of salinomycin / nicarbazin, supplied in the feed at a dose of 40 ppm, was evaluated through changes in productive parameters in broilers challenged experimentally with local strainsof coccidia and raised up to 42 days of age. Broilers of the Cobb Vantress 500 line (n=450) were distributed into three experimental groups with 6 repetitions of 25 birds each. G1: chicks not challenged and treated with the anticoccidial combination, G2: chicks challenged and treated with the anticoccidial combination, and G3: chicks challenged and untreated. Body weight, body weight gain, feed consumption, feed conversion index, European productive efficiency index and the viability were determined. Broilers of groups G2 and G3 were challenged at 14 days with 1 ml of coccidia inoculum containing sporulated oocysts of Eimeria acervuli...

Se evaluó la eficacia en el control de la coccidiosis de la combinación anticoccidial de salinomicina/nicarbazina, suministrado en el alimento a una dosis de 40 ppm, por medio de la evaluación de parámetros productivos en pollos de engorde desafiados experimentalmente con cepas locales de coccidias y criados hasta los 42 días de edad. Se usaron 450 pollos de engorde de la línea Cobb Vantress 500, divididos en tres grupos experimentales con 6 repeticiones de 25 aves. G1: aves no desafiadas y tratadas con la combinación anticoccidial, G2: aves desafiadas y tratadas con la combinación anticoccidial, y G3: aves desafiadas y no tratadas. Se determinó el peso vivo, la ganancia de peso, el consumo de alimento, el índice de conversión alimenticia, el índice de eficiencia productiva europeo y la viabilidad. Las aves de los grupos G2 y G3 fueron desafiadas a los 14 días con 1 ml de in...

The productive performance of broilers supplemented with tylosin phosphate and enramycin as growth promoters up to 42 days of age was evaluated. Four hundred male broilers were distributed into 4 treatments of 100 birds with 5 repetitions each. The treatments were: T1, control; diet without antibiotic; T2, diet with 8% enramycin in a dose of 10 ppm; T3, diet with enramycin 8% in a dose of 5 ppm; T4, diet with tylosin phosphate 25% in a dose of 55 ppm. The treated groups presented a higher body weight and better feed conversion index and European productive efficiency index than the control group; however, there were no differences in body weight gain, feed intake and mortality.

The productive performance of broilers supplemented with tylosin phosphate and enramycin as growth promoters up to 42 days of age was evaluated. Four hundred male broilers were distributed into 4 treatments of 100 birds with 5 repetitions each. The treatments were: T1, control; diet without antibiotic; T2, diet with 8% enramycin in a dose of 10 ppm; T3, diet with enramycin 8% in a dose of 5 ppm; T4, diet with tylosin phosphate 25% in a dose of 55 ppm. The treated groups presented a higher body weight and better feed conversion index and European productive efficiency index than the control group; however, there were no differences in body weight gain, feed intake and mortality.