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1
artículo
Publicado 2020
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The aim of this study was to determine the possible relationship between the presence of lesions called “White Spotted Kidney” (WSK) and the seroprevalence of Leptospira spp in cattle slaughtered in the Manta slaughterhouse, Manabí province, Ecuador. Blood samples were taken from 320 cattle to detect antibodies against Leptospira spp using the microagglutination technique. Likewise, a macroscopic revision of the kidneys was made, and samples were taken for histopathological analysis. The seroprevalence of Leptospira spp was 50.9% and the frequency of kidney injury was 18.13%. The presence of the eight serovars evaluated was found, with the serovars Pomona, Icterohaemorragiae and Bratislava being the most frequent. Animals serologically positive for Leptospira are 40.56 more likely to have specific lesions associated with the disease at the time of slaughter (p<0.00001; OR = 40.56...
2
artículo
Publicado 2020
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The aim of this study was to determine the possible relationship between the presence of lesions called “White Spotted Kidney” (WSK) and the seroprevalence of Leptospira spp in cattle slaughtered in the Manta slaughterhouse, Manabí province, Ecuador. Blood samples were taken from 320 cattle to detect antibodies against Leptospira spp using the microagglutination technique. Likewise, a macroscopic revision of the kidneys was made, and samples were taken for histopathological analysis. The seroprevalence of Leptospira spp was 50.9% and the frequency of kidney injury was 18.13%. The presence of the eight serovars evaluated was found, with the serovars Pomona, Icterohaemorragiae and Bratislava being the most frequent. Animals serologically positive for Leptospira are 40.56 more likely to have specific lesions associated with the disease at the time of slaughter (p<0.00001; OR = 40.56...
3
artículo
Publicado 2017
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The influence of a cooling system (continuous ventilation and intermittent water spray) on productive, reproductive and economic levels of dairy cattle during the summer of 2012 was compared to previous summers where cooling systems were not present. Records of 890 cows in production of two dairies of the Valley Huaura, Lima, Peru were analyzed. Milk production, total solids, conception rate, services per conception and cost-effective data was collected. Farm 2 achieved a significant increase in milk production (p<0.05) due to the cooling system, while in Farm 1 was observed an increase in the percentage of total solids and a reduction in conception rate (p<0.05). The results showed that the use of a cooling system (fans and sprinklers) to reduce heat stress in dairy cows can be effective depending on the circumstances of each dairy herd.
4
artículo
Publicado 2020
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The aim of this study was to determine the effect of age at first calving (AFC) on the standardized production of milk (SMP) of the first and second lactation and interval between the first two calvings (CI) in Holstein cows of the Lima region, Peru. Records of 4215 cows from nine farms, registered in the Dairy Productivity Service of the National Agrarian University La Molina, between January 2003 and December 2012 were analysed. The information was analysed through descriptive statistics and by a mixed linear model, using SAS 9.4. The average AFC was 24.9 ± 2.3 months. The AEPP influenced on the SMP (p=0.0008), but not in the IEP (p=0.3969). Likewise, significant differences were found (p<0.01) between the two lactations, between the four seasons of the year and between the 10 years evaluated for the two variables under study. In conclusion, higher SMP and lower CI were observed at...
5
artículo
Publicado 2020
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The aim of this study was to determine the effect of age at first calving (AFC) on the standardized production of milk (SMP) of the first and second lactation and interval between the first two calvings (CI) in Holstein cows of the Lima region, Peru. Records of 4215 cows from nine farms, registered in the Dairy Productivity Service of the National Agrarian University La Molina, between January 2003 and December 2012 were analysed. The information was analysed through descriptive statistics and by a mixed linear model, using SAS 9.4. The average AFC was 24.9 ± 2.3 months. The AEPP influenced on the SMP (p=0.0008), but not in the IEP (p=0.3969). Likewise, significant differences were found (p<0.01) between the two lactations, between the four seasons of the year and between the 10 years evaluated for the two variables under study. In conclusion, higher SMP and lower CI were observed at...
6
artículo
Publicado 2019
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The aim of this research was to determine the prevalence of Fasciola hepatica and other gastrointestinal parasites in dual-purpose cattle from the municipality Sabana de Torres, department of Santander, Colombia. Faecal and blood samples (n=196) were collected in 18 dual-purpose farms. The animals were stratified into three age groups: 0-12, 12-24 and >24 months. Faecal samples were processed by the McMaster and Dennis coprological techniques, and the presence of antibodies anti-F. hepatica was determined by an indirect ELISA test. The genera of the parasites were identified according to the size and morphology of their eggs or infective larvae. The overall prevalence of gastrointestinal parasites was 36.7%, with the highest values for Eimeria sp (19.4%) and Paramphistomum sp (9.2%). The coprological and serological prevalence of F. hepatica was 4.1 and 6.1%, respectively, which...
7
artículo
Publicado 2019
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The aim of this research was to determine the prevalence of Fasciola hepatica and other gastrointestinal parasites in dual-purpose cattle from the municipality Sabana de Torres, department of Santander, Colombia. Faecal and blood samples (n=196) were collected in 18 dual-purpose farms. The animals were stratified into three age groups: 0-12, 12-24 and >24 months. Faecal samples were processed by the McMaster and Dennis coprological techniques, and the presence of antibodies anti-F. hepatica was determined by an indirect ELISA test. The genera of the parasites were identified according to the size and morphology of their eggs or infective larvae. The overall prevalence of gastrointestinal parasites was 36.7%, with the highest values for Eimeria sp (19.4%) and Paramphistomum sp (9.2%). The coprological and serological prevalence of F. hepatica was 4.1 and 6.1%, respectively, which...
8
artículo
Publicado 2017
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The aim of the present study was to determine the Dietary Cation-Anion Difference (DCAD) concentration in pre-partum diets from nine dairy farms of Lima and Trujillo, Peru. Feed and forage samples were analysed for sodium, potassium, chloride and sulphur in order to calculate DCAD values by mathematical formula. Similarly, urine samples were collected from 76 cows during the pre-partum period to evaluate the relationship between urinary pH and DCAD. The mean DCAD value was 6.62 ± 2.99 mEq/100 g DM for diets of dairy farms in Lima and 13.09 ± 5.36 mEq/100 g DM for diets of dairy farms in Trujillo. Urine pH mean was 7.7, ranging from 6.0 to 8.48. The correlation between DCAD and urine pH values was 0.331.
9
artículo
Publicado 2017
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The aim of the present study was to determine the Dietary Cation-Anion Difference (DCAD) concentration in pre-partum diets from nine dairy farms of Lima and Trujillo, Peru. Feed and forage samples were analysed for sodium, potassium, chloride and sulphur in order to calculate DCAD values by mathematical formula. Similarly, urine samples were collected from 76 cows during the pre-partum period to evaluate the relationship between urinary pH and DCAD. The mean DCAD value was 6.62 ± 2.99 mEq/100 g DM for diets of dairy farms in Lima and 13.09 ± 5.36 mEq/100 g DM for diets of dairy farms in Trujillo. Urine pH mean was 7.7, ranging from 6.0 to 8.48. The correlation between DCAD and urine pH values was 0.331.
10
objeto de conferencia
Publicado 2014
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El objetivo fue evaluar la posibilidad de mitigar las emisiones de metano entérico (CH4) en vacas lecheras mediante la suplementación de alimento concentrado fibroso durante el periodo seco del año; para ello, se utilizó una muestra de 36 vacas lecheras en lactación, divididas en dos grupos iguales de 18 vacas. La alimentación de las vacas consistió en asociación de alfalfa y pastos cultivados dactilis, heno y ensilado de avena, y suplementación con concentrado fibroso en el grupo experimental. El concentrado fibroso se produjo a partir de forrajes fibrosos de desecho y se procesó mecánicamente (avena, totora, alfalfa y paja de cañigua) hasta un tamaño de partícula de 12 mmØ, mezclado con algunos ingredientes molidos (granos de desecho, harina de algodón y soja, harina de pescado, melaza, sal y vitaminas y minerales). Las emisiones entéricas de CH4 se estimaron mediante ...
11
tesis de grado
Publicado 2022
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Universidad Nacional Agraria La Molina. Facultad de Economía y Planificación. Departamento Académico de Economía y Planificación
12
artículo
Publicado 2017
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Se determinó la influencia de un sistema de enfriamiento (ventilación continua y aspersión intermitente de agua) sobre los niveles productivos, reproductivos y económicos del ganado bovino lechero durante el verano de 2012 en comparación con veranos anteriores donde no se contaba con sistemas de enfriamiento. Se analizaron los registros de 890 vacas en producción de dos establos lecheros del valle de Huaura, Lima, Perú. Se tomaron datos de producción de leche, sólidos totales, tasa de concepción, servicios/concepción y costo-beneficio. El establo 2 logró un incremento sustancial de producción de leche (p<0.05) por efecto del sistema de enfriamiento, en tanto que en el establo 1 se observó un incremento en el porcentaje de sólidos totales pero una merma en la tasa de concepción (p<0.05). Los resultados demuestran que la utilización de un sistema de enfriamiento (ven...
13
tesis de grado
Publicado 2014
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El presente trabajo de investigación se realizó en las instalaciones del vivero y jardín botánico del parque zoológico turístico nacional Quistococha, ubicado en el Km 6,5 de la carretera Iquitos – Nauta, al suroeste de la ciudad de Iquitos, distrito de San Juan Bautista, departamento de Loreto, con el objetivo de cuantificar el humus de lombriz producido, determinar el tiempo de producción y evaluar el incremento de la población de lombrices de Eisenia foetida. Se utilizaron los siguientes insumos orgánicos: hojas de kudzu, guaba y retama, asimismo se recolectaron excretas de animales como ronsoco y ganado vacuno. El mayor número de lombrices producidas lo presentó la combinación de 25% kudzu +75% estiércol de ganado, con un total de 1200 lombrices de Eisenia foetida. El tiempo que se requiere para la descomposición de la materia orgánica oscila entre 50 a los 75 días ...
14
tesis de grado
Publicado 2025
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Aun cuando el uso de feromonas puede ser una herramienta valiosa especialmente en sistemas intensivos donde el estrés es un factor limitante en el crecimiento del terneraje, se requiere mayor respaldo científico para su aplicación masiva. El presente estudio, tuvo como objetivo evaluar el uso de feromonas en terneras lactantes para mejorar el bienestar, reducir el estrés y favorecer un mejor crecimiento y adaptación al destete. 118 terneras fueron asignadas a dos tratamientos (T0 sin SecureCattle, n = 59; T1 con SecureCattle, n = 59). Las terneras asignadas al grupo control (T0) no recibieron ningún tipo de tratamiento. Las terneras del grupo experimental (T1) recibieron una aplicación tópica de feromona SecureCattle (5 ml) a nivel intercornual (testuz) en los 0, 14, 28, 42 y 56 días de edad. Durante el período experimental, todos los animales fueron observados diariamente para...
15
tesis de grado
Publicado 2021
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La presente investigación se realizó con el objetivo: Evaluar la incidencia de las actividades agrícolas de la cabecera de la microcuenca Almendra en la calidad del recurso hídrico del distrito y Provincia de Moyobamba. De acuerdo al proceso de la investigación se tuvo en cuenta la siguiente metodología: la investigación pertenece al enfoque cuantitativo; de alcance o nivel correlacional; con un diseño no experimental; las conclusiones obtenidas fueron: Las actividades agrícolas que se desarrollan en la cabecera de la microcuenca Almendra son el cultivo de café, cacao, maíz, y las actividades de pastoreo de ganado vacuno (ganadería), así como también las de pan llevar que involucran cultivos de pequeña escala de yuca, plátano, papaya, caña de azúcar y palta que en su conjunto conforman un grupo considerable; se ha verificado que la expansión agrícola se ha estancado y...
16
artículo
Publicado 2023
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The aim of this study was to evaluate the behaviour and physiological response of Brahman cows grazing in silvopastoral arrangements with scattered trees. The study was conducted in Puerto Nare, Antioquia, Colombia. Two productive systems were typified: a system with relevant shade cover with discontinuous trees and shrubs and a central alley of trees (protocol A) and a control system with scarce tree cover (protocol B). Each system included 19 Brahman cows with calves at foot. Lower environmental temperature was recorded in the paddocks of protocol A (p=0.04) and a higher respiratory rate in cows of protocol B (p=0.0001). There were no differences in dry matter intake (p=0.40), but there was more time dedicated to night grazing by cows from Protocol B (p=0.0017). It is concluded that silvopastoral systems with an adequate offer of shade allow to reduce the ambient temperature by up to 2...
17
artículo
Publicado 2017
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In the present investigation it will benefit the rural population of the High Andean communities, that adopt biogas and biofertilizer as alternative energy and organic fertilizer, respectively; As they will have at their disposal an ecological fuel and organic fertilizer throughout the year, improving their quality of life.For this purpose, tubular biodigesters of PVC geomembrane of 8 and 12 m3 of total volume (1.27 m in diameter and 6.7 to 10 m in length) were used, with 6 and 9 m3 of working volume, respectively, occupied By the manure mixture of cattle: water in the proportion 1: 5. Biodigesters were installed in the Andean communities.Ancash. Peru. Based on the results obtained, at 38 days of loading the biodigester, the biogas produced reached a pressure of 10 cm of water throughout the system. For all this activity, it was required an operating time of the kitchen to biogas of two ...
18
artículo
Publicado 2017
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In the present investigation it will benefit the rural population of the High Andean communities, that adopt biogas and biofertilizer as alternative energy and organic fertilizer, respectively; As they will have at their disposal an ecological fuel and organic fertilizer throughout the year, improving their quality of life.For this purpose, tubular biodigesters of PVC geomembrane of 8 and 12 m3 of total volume (1.27 m in diameter and 6.7 to 10 m in length) were used, with 6 and 9 m3 of working volume, respectively, occupied By the manure mixture of cattle: water in the proportion 1: 5. Biodigesters were installed in the Andean communities.Ancash. Peru. Based on the results obtained, at 38 days of loading the biodigester, the biogas produced reached a pressure of 10 cm of water throughout the system. For all this activity, it was required an operating time of the kitchen to biogas of two ...
19
artículo
Publicado 2017
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In the present investigation it will benefit the rural population of the High Andean communities, that adopt biogas and biofertilizer as alternative energy and organic fertilizer, respectively; As they will have at their disposal an ecological fuel and organic fertilizer throughout the year, improving their quality of life.For this purpose, tubular biodigesters of PVC geomembrane of 8 and 12 m3 of total volume (1.27 m in diameter and 6.7 to 10 m in length) were used, with 6 and 9 m3 of working volume, respectively, occupied By the manure mixture of cattle: water in the proportion 1: 5. Biodigesters were installed in the Andean communities.Ancash. Peru. Based on the results obtained, at 38 days of loading the biodigester, the biogas produced reached a pressure of 10 cm of water throughout the system. For all this activity, it was required an operating time of the kitchen to biogas of two ...
20
artículo
Publicado 2017
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En la presente investigación beneficiará a la población rural de las comunidades altoandinas, que adopte el biogás y biofertilizante como energía alternativa y abono orgánico, respectivamente; pues tendrán a su disposición un combustible ecológico y abono orgánico a lo largo de todo el año, mejorando su calidad de vida.Para ello se emplearon biodigestores tubulares de geomembrana de PVC, de 8 y 12 m3 de volumen total (1,27 m de diámetro y 6,7 a 10 m de longitud), con 6 y 9 m3 de volumen de trabajo, respectivamente, ocupado por la mezcla estiércol de ganado vacuno: agua en la proporción 1:5. Se instaló biodigestores en las comunidades andinas.Ancash. Perú. En base a los resultados obtenidos, a los 38 días de cargado el biodigestor, el biogas producido alcanzó una presión de 10 cm de agua en todo el sistema. para toda estaactividad se requirió un tiempo de funcionamient...
