Balance de energía, nitrógeno y fósforo en sistemas de ceba bovina en pastoreo

Objective: The aim of this work was to perform balances of energy, nitrogen, and phosphorus in pre-fattening and fattening bovine systems at Turiguanó Livestock Breeding Company, in the province of Ciego de Ávila, Cuba. Materials and methods: The botanical composition of the farms evaluated was determined, and energy, nitrogen, and phosphorus balances were performed. Results: The annual energy, nitrogen, and phosphorus balances were negative on the farms in the study. Conclusions: New strategies are required to enhance energy and nutrient (nitrogen and phosphorus) use to increase beef production during the final stage. Accordingly, improvements in recycling, balance, and efficiency in the use of energy and these minerals are linked to increases in live weight/day, and better final weights for the industry during that stage.Objetivo: Realizar el balance de energía, nitrógeno y fósforo de sistemas de ceba inicial y ceba final bovina en la Empresa Pecuaria Genética Turiguanó en la provincia Ciego de Ávila en Cuba. Materiales y métodos: Se determinó la composición botánica en las unidades evaluadas y se realizaron los balances de energía, nitrógeno y fósforo. Resultados: Las unidades estudiadas presentaron balances negativos anuales en lo energético y en el nitrógeno y fósforo. Conclusiones: Son necesarias estrategias para aumentar el aprovechamiento de energía y los nutrientes como nitrógeno y fósforo e incrementar la producción bovina de carne en su fase final, por lo que las mejoras del reciclaje, el balance y la eficiencia de utilización de la energía y estos minerales, están ligadas a los incrementos en peso vivo/día y a mejores pesos finales a industria en esta fase

Energy, Nitrogen, and Phosphorus Balances in Grazing Cattle Fattening Systems

Antecedentes: El objetivo del trabajo fue estimar la eficiencia en la producción lechera de 1 168 casos en la Sierra Sur Andina Ecuatoriana, mediante la aplicación de un modelo de redes neuronales con per-ceptrón multicapa. Métodos: Los casos fueron tomados de fuentes secundarias provistas por el instituto oficial de estadísticas nacionales del Ecuador para el año 2016. Las variables seleccionadas para el modelo fueron: producción total de leche el día de ayer (P) como variable dependiente y número total de ganado vacuno (GV), el total de trabajadores en el terreno (E) además de la superficie total a cargo de la persona productora (S) como variables independientes. Los criterios de selección de las variables fueron: la existencia de datos por cada caso y el impacto de ellas en la variable dependiente. Resultados: La eficiencia promedio fue del 8,11 %, donde la cantidad de casos detectados con eficiencia > 0,70 fueron en total 11 (0,9 % de la muestra). Posteriormente, los casos estudiados se clasificaron en tres grupos en función de la eficiencia calculada: Grupo 1 (eficiencia ≤ 0,4), Grupo 2 (eficiencia > 0,4 hasta ≤ 0,7) y Grupo 3 (eficiencia > 0,7). Conclusiones: Al compararlos se encontraron diferencias estadísticas (P < 0,01) para las variables producción total de leche al año de la granja, y además de otras variables como: total de trabajadores en el terreno, área de la granja, total de vacas, total de unidades de ganado vacuno, partos, vacas preñadas y vacas servidas.Aim: The aim of this work was to estimate the efficiency of milk production in 1 168 cases in Ecuadoran Sierra Sur Andina, with the implementation of neural networks with multilayer perceptrons. Materials and Methods: These cases were collected from secondary samples provided by the Official Institute of National Statistics of Ecuador, in 2016. The variables chosen for the model were total milk production on the previ-ous day (P), as dependent variable; and total cattle heads (CH), total laborers in the field (E), and total surface at-tended by laborer (S), as independent variables. The selection criteria were the existence of data from individual cas-es, and their impact on the dependent variable. ISSN 2224-7920 Results: The average efficiency was 8.11 %, from which the total cases detected efficiently (> 0.70) accounted for 11 (0.9 % of the sample). Later, the cases studied were classified into three groups, depending on the efficiency cal-culated: Group 1 (≤ 0.4 efficiency); Group 2 (> 0.4 - ≤ 0.7 efficiency); and Group 3 (> 0.7 efficiency). Conclusion: A comparison produced several statistical differences (P < 0.01) for variables total milk production/year on the farm, total field laborers, farm size, total cows, total cattle heads, calvings, pregnant cows, and served cows

Energy, nitrogen, and phosphorus balances in grazing cattle fattening systems

The aim of this work was to check the balance of energy, nitrogen, and phosphorus in pre-fattening and fattening bovine systems at Turiguanó Livestock Breeding Company, in the province of Ciego de Ávila, Cuba. The botanical composition of the farms evaluated was determined, and the energy, nitrogen, and phosphorus balances checked. The annual energy, nitrogen, and phosphorus balances were negative on the experimental farms. New strategies are required to enhance energy and nutrients (nitrogen and phosphorus) use, and increase beef production during the final stage. Therefore, improvements in recycling, balance, and efficiency in the use of energy and these minerals are linked to increases in live weight/day, and better final weights during that stage.The aim of this work was to check the balance of energy, nitrogen, and phosphorus in pre-fattening and fattening bovine systems at Turiguanó Livestock Breeding Company, in the province of Ciego de Ávila, Cuba. The botanical composition of the farms evaluated was determined, and the energy, nitrogen, and phosphorus balances checked. The annual energy, nitrogen, and phosphorus balances were negative on the experimental farms. New strategies are required to enhance energy and nutrients (nitrogen and phosphorus) use, and increase beef production during the final stage. Therefore, improvements in recycling, balance, and efficiency in the use of energy and these minerals are linked to increases in live weight/day, and better final weights during that stage