O nitrato encapsulado aumenta a eficiência de utilização do suplemento para bovinos de corte em pastejo
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Universidade Federal de Goiás
Encapsulated nitrate has been pointed out as a promising tool for reducing methane production by ruminant animals. The objective was to evaluate, in Chapter 2, the effects of the use of encapsulated nitrate on the performance of beef cattle on pasture in the dry season, dry transition of water and water, and in Chapter 3 the fermentative parameters in in vitro assays using substrates in proportions and similar compositions of the performance experiment. The evaluated treatments were: Control – protein-energy supplement without inclusion of encapsulated nitrate, and EN – protein-energy supplement with inclusion of 50 g of encapsulated nitrate per kg of dry matter. In the performance experiment (Chapter 2), the supplement was given daily at 1.0% of body weight. The leftover concentrate was weighed daily to estimate supplement intake. The animals were weighed every 28 days, and the rate of supplement consumption was also evaluated. There was a reduction in supplement dry matter intake with the inclusion of EN in the supplement in the dry period (P < 0.01) (2.404 to 2.283 kg/day), dry-water transition (P < 0.01) (2.922 kg to 2.496 kg/day), water (P < 0.01) (3.631 to 3.143 kg/day) and total period (P < 0.01) (2.943 to 2.605 kg/day). The average daily gain was not influenced by the inclusion of NE in any of the evaluated periods (P > 0.13). The inclusion of EN resulted in an increase in the feed efficiency of the animals in the dry-water transition period from 0.362 to 0.411 (P < 0.01). In Chapter 3, three experiments were carried out, corresponding to the dry season, dry-water transition and water, in order to evaluate the Control and EN treatments. The evaluation times were zero, three, six, nine, 12, 24 and 48 hours after incubation. Each time was composed of its respective triplicates. In these times, the in vitro degradability of dry matter (IVDDM) and neutral detergent fiber (IVDNDF), ammonia nitrogen (N-NH3), methane and gas production were evaluated. At 24 hours, the production of short-chain fatty acids (SCFA) was evaluated. There was a reduction in methane production from 22.2 to 19.3 mg (P < 0.01) in the dry season. The total incubation time (48 hours) was marked with a 5% reduction in IVDDM with inclusion in EN (741.4 vs 703.9 g/kg) (P < 0.02) in the dry transition season substrate. waters. An increase in the molar proportion of acetate from 14.36 to 20.33 mM/L (P < 0.04) was observed with the inclusion of encapsulated nitrate in the wet season substrate. There was no significant effect of including nitrate in the wet season substrate on IVDDM and IVDNFD (P > 0.06). The inclusion of encapsulated nitrate in the proportion of 50 g/kg of supplement DM increases the feed efficiency of grazing animals, and reduces the methane production with the use of dry season forage.
FIGUEIREDO, C. B. O nitrato encapsulado aumenta a eficiência de utilização do suplemento para bovinos de corte em pastejo. 2021. 69 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2021.