Estructura de parches y dinámica de utilización en campo natural y mejoramientos bajo pastoreo rotativo

This study was carried out between November 3 and December 14, 2020, at Estación Experimental Mario A. Cassinoni (EEMAC), in the department of Paysandú, Uruguay. The same was carried out in paddock 18, on San Manuel unit soil. Two treatments were studied: natural pasture and enhanced natural pasture (8 kg/ha of Trifolium pratense cv. Estanzuela 116 and 6 kg/ha of Lotus Tenuis cv Matrero, carried out in 2018). In these treatments, 3 heifers of 290 kg average per plot grazed for 15 days, with 45 days of rest (rotary grazing). The results at a comparative level between treatments did not show differences in height, forage mass, forage supply or growth rate. Also, within each plot of each treatment, plant communities were chosen (according to soil type or botanical composition) trying to represent approximately 80% of the plot, in order to analyze how these communities behaved in their pasture structure. Inside the enhanced natural pasture, two communities were chosen, called: Solonetz soild of enhanced natural pasture and legume. Inside the natural pasture three communities called: quadrifarium, deep and Solonetz soil of natural pasture. For them, measurements of maximum height, leaf height, pod height, green/dry estimation and leaf/pod estimation were made. Also, per day of measurement, two cuts were made, separating between dry rest, leaf, pod and legumes. When analyzing by community, significant differences were obtained in centimeters and kilograms between communities and within communities (difference in the different 4 moments measured). It was observed that solonetz community were not consumed at any time and that the quadrifarium, deep and legume communities were highly selected by the animals. It was also possible to determine a large significant difference between legume communities with a high percentage of Desmodium incanum and others with a high percentage of Trifolium pratense. Also, it was obtained for all the communities, that from the third moment (day ten), the consumption by the cattle is notoriously lowered.