Cambios en las variables estructurales por efecto de la intensidad y frecuencia del pastoreo y la incidencia en la productividad en festuca

This thesis addresses the impact of different defoliation management strategies, varying in intensity and contrasting frequencies, on the productivity of Festuca arundinacea var. Estanzuela Tacuabé, a key perennial grass in pastoral systems in Uruguay. The objectives included quantifying changes in the vegetative structure of tall fescue under contrasting grazing intensities and frequencies, as well as assessing the impact on flowering management. This study was conducted at the Dr. Mario A. Cassinoni Experimental Station, where two grazing frequencies (2 and 4 leaves) and two defoliation intensities (30% and 70%) were combined in a randomized complete block design. The results showed that lower grazing intensity (30%) had a positive effect on leaf and tiller weight compared to higher intensities (70%). Similarly, lower grazing frequencies (4 leaves) resulted in greater weight compared to higher frequencies (2 leaves). Overall, a less intensive grazing management approach favored foliar recovery and growth. However, higher grazing intensities and frequencies (2H 70) led to a higher total number of tillers. Additionally, lower grazing frequencies increased available LAI and intercepted %PAR, while higher grazing frequencies and intensities reduced these values. This study highlights the effect of management practices and the importance of adjusting grazing strategies to seasonal conditions to maximize system productivity and efficiency.