Evaluación del tipo de sorgo bajo pastoreo en la producción animal

The purpose of this work was to address the stated objectives, evaluating the new alternatives of grazing forage sorghum and its response in animal production. The experiment took place at the Mario A. Cassinoni Experimental Station (EEMAC), of the Facultad de Agronomía, Universidad de la República, Paysandú, Uruguay. (32°22' 29.8" south latitude and 58°03' 43.4" west longitude), on Typical and Luvic Eutric Brunosols soils. The treatments under evaluation were 2, grazing of forage sorghum cv. Talismán (BMR) and grazing of forage sorghum cv. Green Supremo (FS). Animal productivity was evaluated, with the same grazing management between both treatments. The experiment had a design of plots divided into blocks with three replications. Two grazing cycles were carried out with 5 and 3 steers/plot for photosensitive materials and BMR successively. Holland breed animals were used, where the starting weight was adjusted between grazing cycles based on forage availability. The average weight was 530 kg in the first cycle, and 463 kg in the second. The different treatments did not present significant differences (p > 0.10) in terms of individual daily weight gain in the complete evaluation period (1.01 vs. 0.90 kg/an/day for FS and BMR successively). However, the treatments presented differences in the first grazing cycle (p < 0.10) in favor of the photosensitive material (1.29 vs 1.08 kg/an/day for FS and BMR successively). For the remaining parameters under evaluation, the lack of repetitions did not allow statistical analysis. The prevailing environmental conditions in the experimental period, characterized by low rainfall, were more decisive in the results obtained than the type of sorghum material used in grazing.