The aim of this research was to assess levels of 2.7 and 2.9 Mcal of digestible energy (ED/kg of feed) and amino acids densities (DA) of 100, 110 and 120% in relation to nutritional standards of the NRC (1995) on productive performance of genotype improved guinea pigs after weaning (2-6 weeks of age). Diets were formulated considering the amino acids concentration relative to the level of ED (g/Mcal) with inclusion of vitamin Cin the pelleted feed because no fresh forage was used. A randomized complete design for all treatments and a factorial arrangement 2x3 were used, having as factors two levels of ED (2.7 and 2.9 Mcal/kg) and three DA (100, 110 and 120%), and without considering the control treatment. Covariance analysis was performed, considering the initial weight as a covariate, and Bonferroni adjustment to determine the difference between treatments and factors. The more efficien...

The objective of this study was to establish the presence of Anisakis spp in freshwater fish in the El Paraíso wetland, in Huacho, Peru, due to massive parasitism observed in previous studies of identification of aquatic communities. The parasites were sampled in three common species in the wetland. Results showed 90, 75 and 66% of fish Dormitator latifrons, Mugil cephalus and Lebiasina bimaculata were infested with Anisakis parasites in larval stage L3, respectively. In addition, 50 and 25% of D. latifrons and M. cephalus, respectively, presented larvae of this parasite in the liver and visceral cavity. On macroscopic inspection, the Anisakis spp larva is observed spirally attached to the liver or disseminated in the intestines. Microscope images show the penetration tooth and the mucron, specific characteristics in the identification of Anisakis larvae. The present study is a first re...

El objetivo de la investigación fue evaluar los niveles de 2.7 y 2.9 Mcal de energía digestible (ED)/kg de alimento y densidades de aminoácidos (DA) de 100, 110 y 120% en relación a los estándares nutricionales del NRC (1995) sobre el rendimiento productivo de cuyes de genotipo mejorado durante la fase de crecimiento posdestete (2-6 semanas de edad). Las dietas se formularon considerando la concentración de aminoácidos en relación al nivel de ED (g/Mcal) con inclusión de vitamina C en el alimento peletizado, debido a que no se utilizó forraje verde. Se utilizó un diseño completamente al azar para todos los tratamientos y un arreglo factorial de 2x3, teniendo como factores dos niveles de ED (2.7 y 2.9 Mcal/kg) y tres DA (100, 110 y 120%), sin considerar el tratamiento control. Se realizó el análisis de covariancia, considerando al peso inicial como covariable, y el ajuste de...

The objective of this study was to establish the presence of Anisakis spp in freshwater fish in the El Paraíso wetland, in Huacho, Peru, due to massive parasitism observed in previous studies of identification of aquatic communities. The parasites were sampled in three common species in the wetland. Results showed 90, 75 and 66% of fish Dormitator latifrons, Mugil cephalus and Lebiasina bimaculata were infested with Anisakis parasites in larval stage L3, respectively. In addition, 50 and 25% of D. latifrons and M. cephalus, respectively, presented larvae of this parasite in the liver and visceral cavity. On macroscopic inspection, the Anisakis spp larva is observed spirally attached to the liver or disseminated in the intestines. Microscope images show the penetration tooth and the mucron, specific characteristics in the identification of Anisakis larvae. The present study is a first re...

El presente estudio evaluó la duración de los días de gestación (DG) y el tamaño de camada (TC) en marranas de granja de costa central seropositiva y granja de selva central seronegativa al Virus del Síndrome Reproductivo y Respiratorio Porcino (VPRRS) durante los años 2015 y 2016. Marranas de granja seropositiva a VPRRS muestran DG aumentados y TC disminuidos en granja seropositiva a VPRRS comparado con los de selva seronegativa en 2015. Los DG de marranas de granja seropositiva a VPRRS fueron de menor duración en 2015 en comparación con 2016. La DG y el TC no fueron influenciados por la época de inseminación artificial. Menor DG con mayor TC expresan el comportamiento reproductivo normal y respaldan el resultado seronegativo a VPRRS en granjas de selva. Mayor TC en granja positiva a VPRRS en 2016 con respecto a 2015 sugiere desarrollo de procesos adaptativos fisiológicos de...

The present study evaluated the duration of days of gestation (DG) and litter size (LS) in pigs of a seropositive central coast farm and seronegative central tropics farm to Porcine Reproductive and Respiratory Syndrome Virus (VPRRS) during the years 2015 and 2016. Sows from VPRRS-positive farm showed increased DGs and LSs decreased in VPRRS-positive farm compared to those from seronegative tropical farm in 2015. DGs from VPRRS-positive farm pigs were shorter in 2015 compared to 2016. The DG and the LS were not influenced by the time of artificial insemination. Lower DG with higher LS expresses normal reproductive performance and support the seronegative result to VPRRS in tropical farms. Increased LS in positive farm to VPRRS in 2016 with respect to 2015 suggests the development of physiological adaptive processes of sows induced by the presence of the disease due to immunoregulation. &...

The intensive use of growth-promoting antibiotics (APC) has led to bacterial resistance with harmful effects on health, in this situation it is necessary to look for alternative products, such as phyt1ogenic products. The objective of the research was to evaluate the effect of garlic and onion flour in the diet on productive performance and batch uniformity in broilers. 150 male beef chickens of the Cobb 500 line were used. The broilers were randomly distributed into three groups with five replications and each replication with ten chickens. The treatments were: T0: Negative control, without APC; T1: Positive control, with APC (Enramycin 8%); T2: Garlic flour 0.75% + onion 0.75%. The productive performance variables were: live weight, feed consumption, feed conversion and batch uniformity. The analysis of variance of a completely randomized design (DCA) and the Tukey test were used to ev...

El objetivo de la investigación fue comparar las características agronómicas, productivas, nutricionales y económicas de cuatro genotipos de maíz forrajero: INIA 617 Chuska, M28T Marginal 28 Tropical, Atlas 777 e INIA 619 Megahíbrido, en el valle de Chancay, Perú. Los cuatro genotipos, con cuatro replicaciones cada uno, fueron distribuidos aleatoriamente en 16 unidades experimentales. Cada unidad experimental estuvo representada por 16 surcos de 29 m de longitud, espaciados a 0,85 m, con una distancia de siembra entre golpes de 0,30 m y tres semillas por golpe. Las características agronómicas se evaluaron a los 93 días de siembra, mientras que el rendimiento productivo, nutricional y económico fueron estimados a los 110 días postsiembra. Los genotipos INIA 617 y M28 alcanzaron la mayor altura de planta, mientras que INIA 619 y Atlas 777 mostraron el mayor número de hojas y n...