Grazing Distribution and Diet Quality of Angus, Brangus, and Brahman Cows in the Chihuahuan Desert

Abstract

Grazing distribution can be improved by using adapted cattle breeds that travel to distant areas of extensive pastures. A 2-yr study was conducted to evaluate grazing distribution and diet quality of Angus, Brangus, and Brahman cows (seven cows per breed group) in the Chihuahuan Desert during three seasons (winter, early summer, and late summer) using three pastures. Two GPS collars were randomly assigned to each breed group and cow positions were logged every 10 min for 10-to 14-d periods in each pasture (3 periods Á season À1 ). In 2008, breed groups were evaluated in separate pastures and data were analyzed as a 333 Latin square design. In 2009, all breed groups were evaluated at the same time in the same pastures. Fecal samples were collected in 2008 and analyzed using near infrared spectroscopy (NIRS) to estimate diet quality. If positions recorded when cows were resting were excluded, Brahman cows traveled greater distances per day than Angus cows throughout the study and greater (P 0.10) than Brangus cows in all but one season during 2009. No differences in average distance to water were detected (P . 0.10) among breed groups. During early summer in 2008 and early and late summer in 2009, Angus cows maintained a more linear grazing path (P 0.10) than Brangus or Brahman cows. Brahman cows displayed more sinuous grazing paths (P 0.10) than other breeds during early and late summer seasons in 2009. In 2008, no differences in crude protein content of diets were detected (P . 0.10) among breed groups during all seasons. Spatial movement patterns of Brahman cows appeared to differ from Angus and Brangus cows; however, there was no evidence to suggest that there was any advantage in use of areas far from water by any breed group. ResumenLa distribución del pastoreo puede ser mejorada usando razas de ganado que se adapten a caminar largas distancias en potreros grandes. Se realizó un estudio de dos años para evaluar la distribución del pastoreo y calidad de la dieta de vacas Angus, Brangus, y Brahman (siete vacas por grupo racial) en el Desierto Chihuahuense durante tres temporadas (invierno, inicio, y finales de verano) usando tres potreros. Dos collares con GPS fueron asignados aleatoriamente a cada grupo racial y la posición de las vacas fue anotada cada 10 minutos por periodos de 10 a 14 días en cada potrero (tres periodos por temporada). En 2008, los grupos raciales fueron evaluados en porteros separados y los datos fueron analizados en un diseño de cuadro latino de 333. En 2009, todos los grupos raciales fueron evaluados al mismo tiempo en los mismos potreros. En 2008 se recolectaron muestras fecales y se analizaron usando espectroscopia infrarroja (NIRS) para estimar la calidad de la dieta. Sí se excluye el tiempo registrado de cuando las vacas estuvieron descansando, las vacas Brahman recorrieron mayores distancias por día que las vacas Angus a través del estudio y mayor (P 0.10) que las vacas Brangus en todos pero una temporada durante el 2009. No se encontró diferencia (P . 0.10) en distancia a el agua e...

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