Grãos de destilaria, glicerina bruta e óleo de soja em estratégias de terminação de bovinos a pasto

Abstract

The objective of this study was to evaluate the inclusion of crude glycerin, distillery grains and soybean oil in mineral-protein-energetic supplements, for finishing for cattle under grazing. Experiment 1: Outlined in Latin square 5X5, the use of crude glycerin was evaluated, evaluating four levels of crude glycerin (0, 80, 160, 240 g / kg) supplement, offered in daily quantity of 4 kg that represented 0.80% of body weight (CP), when compared with mineral supplementation only. Regardless of the level of crude glycerin supplementation, the mineral-protein-energetic supplementation increased the ruminal ammoniacal nitrogen content, total dry matter intake, and organic matter digestibility. Increasing levels of dry distillery (DDG) were used in substitution of corn and soybean meal at 0% (0D), 30% (30D) levels, 60% (60D) and 90% (90D), during dry season and dry transition water, with daily supply of 2 kg, which represented 0.35% of the mean CP of the animals. The supply of distillery grains as a supplement did not affect the total dry matter, forage dry matter, neutral detergent insoluble fiber, and crude protein, dry matter viii digestibility, organic matter, neutral detergent insoluble fiber and crude protein, both in the dry period of the year, as in the dry-water transition. On the other hand, the performance of animals supplemented with 0% (0D), 30% (30D), 60% (60D) or 90% (90D) of DDG during the dry season was evaluated using a completely randomized design. of the year, using 48 animals distributed in 16 pickets, each DDG level was offered at 4 pickets. No influence of distillery grains was found for performance metrics, however, viability was increased as DDG was included in the supplement. Experiment 5: Outlined in Latin square 5X5, the objective was to evaluate the nutritional parameters, as a function of the additional energy supply given by the increase of crude soybean oil in: 0g; 200g; 400g; 600g and 800g per animal / day, during the water season. The additional supply of soybean oil in supplements did not change the variables related to the consumption of: dry matter, forage, organic matter, crude protein, neutral detergent insoluble fiber (NDF), non-fibrous carbohydrates and total digestible nutrients. While total NDF digestion reduced linearly. Experiment 6: following a completely randomized design, extra energy supply was evaluated by adding 0 g; 200g; 400g; or 600g of soybean oil in 5 kg of mineral-protein-energetic supplement during the water season, using 48 animals distributed in 16 pickets, each additional level of soybean oil was offered in 4 pickets. The level-independent soybean oil supply increased performance and carcass finishing, achieving a higher economic return for the supply of 200 g / soybean oil / animal / day. The mineral-protein-energy supplementation using alternative ingredients such as crude glycerin or distillery grains, showed nutritional viability, as it did not affect nutritional parameters, and in the case of economically viable DDG, by increasing the financial return. Already the increase in the energy supply although it reduces the digestibility of some nutritional compounds, it increases the economic return by improving the performance.