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espanolIntroduccion. Los minerales juegan un papel muy importante en la nutricion, porque son necesarios para la biosintesis de nutrientes esenciales. Objetivo. Evaluar el estado mineral en suero sanguineo, el consumo de minerales y la produccion de leche de vacas Holstein en pastoreo suplementadas con distintos niveles de alimento concentrado y tiempo de permanencia en la pradera en el valle de Toluca, Mexico. Materiales y metodos. Se realizaron dos experimentos con un diseno de cuadro Latino 3x3 cada uno en la Universidad Autonoma del Estado de Mexico, realizados en primavera-verano de 2011-2012. En el experimento uno se evaluo el nivel de concentrado en la dieta (3, 5 y 8 kg dia-1) en vacas pastoreando; en el experimento dos se evaluaron tres tiempos de permanencia en la pradera (ocho horas continuas; dos tiempos de cuatro horas post-ordeno; y doce horas). En ambos experimentos se oferto ensilado de maiz a libre consumo en el corral. En suero sanguineo y alimentos se les midio la concentracion de Ca, P, Mg, K, Na, Cu, Fe y Zn. Se realizaron analisis de correlacion simple y de regresion multiple para las variables de estudio. Resultados. El nivel de concentrado y el tiempo de permanencia en la pradera afectaron (p EnglishIntroduction. Minerals play a very important role in nutrition; because they are necessary for the biosynthesis of essential nutrients. Objective. To evaluate the mineral status in blood serum, mineral consumption and milk production of grazing Holstein cows supplemented with different levels of concentrated feed and time spent in the meadow of Toluca valley, Mexico. Materials and methods. Two experiments were carried out with a 3x3 Latino square design each at the Universidad Autonoma del Estado de Mexico, carried out in the spring-summer of 2011- 2012. In experiment one, the level of concentrate in the diet (3, 5 and 8 kg day-1) was evaluated in grazing cows; in experiment two, three times of permanence in the prairie were evaluated (eight continuous hours; two times of four hours post-milking; and twelve hours). In both experiments, corn silage ad libitum was offered for free consumption in the pen. The concentration of Ca, P, Mg, K, Na, Cu, Fe, and Zn was measured in blood serum and foodstuffs. Simple correlation and multiple regression analysis were performed for the study variables of mineral intake, milk production, and minerals in blood serum. Results. The level of concentrate and the time spent in the prairie affected (P marginal for Ca, deficient in Mg and Zn; and there were excess of K. Conclusion. The consumption of minerals was not decisive to predict the concentration of minerals in the blood serum of dairy cows, however, it showed influence on the milk production of cows under two mixed grazing-stallproduction systems.

Perfil mineral sérico de vacas Holstein en lactación en sistemas mixtos de estabulación-pastoreo