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espanolExisten numerosas tecnicas que permiten la estimacion de la materia seca ingerida (MSI) por animales bajo condiciones de pastoreo. Sin embargo, el comportamiento selectivo del animal incorpora una importante fuente de variabilidad que afecta la confiabilidad de los resultados obtenidos. La tecnica que utiliza dioxido de titanio (TiO2 ) como marcador externo ha sido reportada como una alternativa confiable en la estimacion del consumo. El objetivo de este estudio fue comparar la prediccion de consumo empleando la tecnica de TiO2 en condiciones de pastoreo respecto a tres ecuaciones de prediccion de consumo animal reportadas para situaciones similares a la experimental. Los datos utilizados correspondieron a un experimento realizado empleando 20 vaquillonas Hereford, agrupadas en dos lotes de 10 segun su peso vivo (PV), en un diseno “crossover”, realizado durante dos periodos: invierno y primavera 2013. En ambos periodos, cada lote fue asignado a dos pasturas de calidad inicial contrastante: 65,5% vs. 71,2% de digestibilidad de materia seca (DMS); 54,9% vs. 40,9% de fibra detergente neutro (FDN), y 11,6% vs 22,8 % de proteina cruda (PC). Cada periodo experimental consistio de 8 dias de adaptacion a la dieta y 5 dias de medicion con un suministro diario, desde el inicio, de 10 g de TiO2 por animal. En cada periodo de medicion se confecciono una muestra compuesta de heces por animal a partir de su colecta diaria via rectal y se determino su composicion quimica. Los resultados de MSI (kg d-1) medidos para ambas pasturas utilizando la tecnica de TiO2 mostraron una mayor variabilidad que los resultados predichos por cualquiera de las tres ecuaciones. EnglishMany techniques have been developed for the estimation of dry matter intake (DMI) by animals under grazing conditions. However, the selective intake of pasture grass by cattle incorporates an important source of variability that affects the confidence of the obtained results. The technique based on the external marker titanium dioxide (TiO2) has reported to be a reliable alternative in estimating animal intake. The objective of this study is to compare the TiO2 technique under grazing conditions with respect to three animal intake prediction equations, which were developed under similar conditions of our experiment. The data analyzed correspond to a crossover experiment using 20 Hereford heifers, grouped into two lots of 10 according to their live weight (LW), and carried out during two periods: winter and spring 2013. In both periods, each lot was assigned to two pastures with contrasting initial quality: 65.5% vs. 71.2% dry matter digestibility (DMD); 54.9% vs. 40.9% neutral detergent fiber (NDF), and 11.6% vs. 22.8% crude protein (CP). Each experimental period consisted of 8 days of adaptation to the diet plus 5 days of measurements. From the beginning, 10 g of TiO2 per animal were daily supplied. During each measurement period, a fecal composite sample per animal was elaborated from its daily collection per rectum, and its chemical composition was determined. The results of DMI (kg d-1) measured for both pastures using the TiO2 technique showed greater variability than the results predicted by any of the three equations.

Estudio de la variabilidad de la técnica de estimación de consumo en pastoreo a través del marcador externo Dióxido de Titanio