El trabajo de investigación se realizó en la Estación Experimental Agropecuaria (E.E.A.) El Mantaro, en el distrito del Mantaro, Región Junín. Para la cual se evaluaron 178 registros de producción de vacas del establo desde el año 2009 hasta 2015. El objetivo fue determinar la repetibilidad o índice de constancia de la producción de leche (PL) del hato de vacas, evaluar la duración de la lactación (DL), estimar la producción de leche estandarizada (2X-305D-E.A) y sus respectivas repetibilidades. Los resultados indican que la producción lechera fue de 3788.41 ± 93.05 kg, en tanto que la duración de la lactación fue de 3825.3 ± 42.72 días y la producción de leche estandarizada fue de 3825.3 ± 42.72 kg. Las repetibilidades calculadas fueron 0.26 ± 0.12; 0.32 ± 0.13 y 0.13 ± 0.12 (m ± d.s) para la producción de leche (PL), duración de la lactación (DL) y producció...

The aims of this study were to determine the dynamics of seroconversion of bovine viral diarrhea (DVB) and neosporosis, as well as the presence of animals persistently infected (PI) with the DVB virus in cattle farms of two experimental stations of the Universidad Nacional del Centro del Peru: In total, 111 Brown Swiss cattle in the EEA El Mantaro and 39 Holstein cattle in the GA Yauris, both located in the central highlands, Junín Region, Peru were used. Three evaluations (August 2015, and February and August 2017) were performed to detect serum antibodies against vBVD and N. caninum, and DVB antigens, using ELISA tests. The average prevalence of DVB in the EEA El Mantaro was 73.5%, the seroconversion dynamics in the herd was increasing over time, and the prevalence of PI animals was 5.4%. For GA Yauris, the average prevalence of DVB was 16.67%, the seroconversion dynamics were stable ...

The association of gastrointestinal parasitism with body weight, haematocrit and the FAMACHA method was determined in Junín sheep (lambs and rams) from the Stud group of SAIS Túpac Amaru Ltda. No. 1, Junín Region, Peru. The study was carried out in two seasons: May (dry) and October (rainy). In total, 109 rams and 98 lambs were sampled in May and 89 rams and 85 lambs in October 2018. There was a negative correlation between the haematocrit and the transformed value of parasite load. All the animals were positive to gastrointestinal parasites, finding a higher parasite load in males in October and in May in females. In May there were more cases of animals resistant to parasitism than in October. The highest frequency of gastrointestinal parasites was Nematodirus (50%), followed by Trichostrongylus (25%) and Ostertagia (15%).

The aims of this study were to determine the dynamics of seroconversion of bovine viral diarrhea (DVB) and neosporosis, as well as the presence of animals persistently infected (PI) with the DVB virus in cattle farms of two experimental stations of the Universidad Nacional del Centro del Peru: In total, 111 Brown Swiss cattle in the EEA El Mantaro and 39 Holstein cattle in the GA Yauris, both located in the central highlands, Junín Region, Peru were used. Three evaluations (August 2015, and February and August 2017) were performed to detect serum antibodies against vBVD and N. caninum, and DVB antigens, using ELISA tests. The average prevalence of DVB in the EEA El Mantaro was 73.5%, the seroconversion dynamics in the herd was increasing over time, and the prevalence of PI animals was 5.4%. For GA Yauris, the average prevalence of DVB was 16.67%, the seroconversion dynamics were stable ...

La investigación tuvo como objetivo evaluar un protocolo de inducción de celo en borregas lactantes con tratamiento hormonal de progestágenos y eCG con destete temporal de corderos para inseminación artificial a tiempo fijo por vía transcervical con semen refrigerado sobre la presentación de celo, preñez y natalidad. Se trabajó con 37 borregas distribuidas entre tres tratamientos: T1, borregas con destete temporal de la cría (n=15); T2, borregas con cría sin destete (n=10); T3, borregas en seca y sin cría (n=12). El destete temporal fue por 48 h previos a la inseminación. T1 y T3 presentaron una mayor tasa de celo manifiesto (100 y 91.66%, respectivamente) que T2 (60%; p<0.05). La tasa de no retorno de celo a los 14-17 días pos-servicio fue estadísticamente similar entre grupos (93.33, 60.0, 91.66% para T1, T2 y T3, respectivamente). En forma similar, el porcentaje de preñ...

The research aimed to evaluate a protocol of induction of oestrous in lactating ewes with hormonal treatment of progestins and eCG with temporary weaning of lambs for artificial insemination at a fixed time by transcervical route using refrigerated semen on the presentation of oestrous and pregnancy and lambing rate. In total, 37 ewes were distributed among three treatments: T1, lactating ewes with temporary weaning (n=15); T2, lactating ewes with lamb at foot (n=10); T3, dry ewes without lamb (n=12). Temporary weaning was for 48 h prior to insemination. T1 and T3 presented a higher rate of manifest oestrous (100 and 91.66%, respectively) than T2 (60%; p<0.05). The non-return heat rate at 14-17 days post-service was statistically similar between groups (93.33, 60.0, 91.66% for T1, T2 and T3, respectively). Similarly, the pregnancy percentage by ultrasound at 45 days and the percentage...

La investigación tuvo como objetivo evaluar un protocolo de inducción de celo en borregas lactantes con tratamiento hormonal de progestágenos y eCG con destete temporal de corderos para inseminación artificial a tiempo fijo por vía transcervical con semen refrigerado sobre la presentación de celo, preñez y natalidad. Se trabajó con 37 borregas distribuidas entre tres tratamientos: T1, borregas con destete temporal de la cría (n=15); T2, borregas con cría sin destete (n=10); T3, borregas en seca y sin cría (n=12). El destete temporal fue por 48 h previos a la inseminación. T1 y T3 presentaron una mayor tasa de celo manifiesto (100 y 91.66%, respectivamente) que T2 (60%; p<0.05). La tasa de no retorno de celo a los 14-17 días pos-servicio fue estadísticamente similar entre grupos (93.33, 60.0, 91.66% para T1, T2 y T3, respectivamente). En forma similar, el porcentaje de pr...

Endoparasitosis is a critical health challenge in the management of Creole goats under extensive production systems due to its negative impact on animal health and productivity. This study determined the occurrence of endoparasites and identified associated risk factors in Creole goats from the southern coast of Peru. Fecal samples were collected from 129 goats in two localities of the Pisco province to detect the presence of oocysts from Eimeria spp. and eggs from trichostrongyles, Skrjabinema spp., Trichuris spp., and Fasciola hepatica. Data were analyzed using logistic regression models and adjusted through bootstrapping and stepwise selection methods, with locality, feeding type, age, and body condition as predictive variables. The results revealed a high occurrence of Eimeria spp. (86.0%) and trichostrongyles (65.1%), while Fasciola hepatica (14.0%) and Skrjabinemaspp. (7.0%) were e...