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<p>Natural probiotics, such as bacteria and yeast, can be used as an alternative additive to increase animal efficiency and performance. The objective was to evaluate the effects of probiotics and monensin during the initial confinement period, as well as the replacement of monensin with probiotics in the final period. Forty-eight Nellore young bulls with an initial body weight of 356.2 ± 17.9&#xa0;kg and 26 ± 1.2 months were used in a completely randomized design. Two animals per pen were housed in 80 m<sup>2</sup> pens. The experiment consisted of two phases. The first phase lasted from day 1 to day 30, during which the animals were divided into two groups of 24 animals each. The treatments were dietary supplements: monensin (Mo1; 3.0&#xa0;g/day) or <i>Saccharomyces cerevisiae boulardii</i> (Scb; 0.5&#xa0;g/day). In the second phase, each group was divided into 12 animals per treatment, which received monensin (Mo2) or <i>Bacillus toyonensis</i> (Bt; 1.0&#xa0;g/day). All animals were slaughtered at the end of the 100-day feedlot period (P1 (30 days) + P2 (70 days)) with an average final weight of 498.2 ± 9.7&#xa0;kg. There was no effect (<i>P</i> &gt; 0.05) on carcass characteristics, except the ribeye area at the 5th rib, which was larger (<i>P</i> = 0.030) in the Scb-Mo2 (33.9 ± 0.8&#xa0;cm²) treatment. The b* parameter of subcutaneous fat color was greater (<i>P</i> = 0.045) in Mo1-Mo2 (b*=14.07 ± 1.1) and Mo1-Bt (b*= 13.33 ± 1.0). The meat from treatments Mo1-Mo2 had lower shear force (<i>P</i> ≤ 0.020) at zero (6.21 ± 0.6&#xa0;kg) and seven (5.80 ± 0.7&#xa0;kg) days of aging. The yeast <i>S. cerevisiae boulardii</i> (0.5&#xa0;g/day in the first phase) and the bacterium <i>B. toyonensis</i> (1.0&#xa0;g/day in the second phase) used in the first and second phases, respectively, can effectively replace monensin in confinement diets without compromising carcass or meat quality.</p>

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Sequential use of nutritional additives in diets for finishing Nellore young bulls in confinement on the carcass and meat characteristics

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Paulo Eduardo de Oliveira Monteiro,
  • Jaqueline Rodrigues Ferreira Cara,
  • Lucy Mery Antonia Surita,
  • Marília Williani Filgueira Pereira,
  • Bruno Henrique de Sousa Limoni,
  • Thiago Luís Alves Campos de Araújo,
  • Rosanne Cristine da Silva Luz Benevenuto Santos,
  • Samara Miyaki Corrêa,
  • Priscilla Dutra Teixeira,
  • Luís Carlos Vinhas Ítavo,
  • Marina de Nadai Bonin Gomes

摘要

Natural probiotics, such as bacteria and yeast, can be used as an alternative additive to increase animal efficiency and performance. The objective was to evaluate the effects of probiotics and monensin during the initial confinement period, as well as the replacement of monensin with probiotics in the final period. Forty-eight Nellore young bulls with an initial body weight of 356.2 ± 17.9 kg and 26 ± 1.2 months were used in a completely randomized design. Two animals per pen were housed in 80 m2 pens. The experiment consisted of two phases. The first phase lasted from day 1 to day 30, during which the animals were divided into two groups of 24 animals each. The treatments were dietary supplements: monensin (Mo1; 3.0 g/day) or Saccharomyces cerevisiae boulardii (Scb; 0.5 g/day). In the second phase, each group was divided into 12 animals per treatment, which received monensin (Mo2) or Bacillus toyonensis (Bt; 1.0 g/day). All animals were slaughtered at the end of the 100-day feedlot period (P1 (30 days) + P2 (70 days)) with an average final weight of 498.2 ± 9.7 kg. There was no effect (P > 0.05) on carcass characteristics, except the ribeye area at the 5th rib, which was larger (P = 0.030) in the Scb-Mo2 (33.9 ± 0.8 cm²) treatment. The b* parameter of subcutaneous fat color was greater (P = 0.045) in Mo1-Mo2 (b*=14.07 ± 1.1) and Mo1-Bt (b*= 13.33 ± 1.0). The meat from treatments Mo1-Mo2 had lower shear force (P ≤ 0.020) at zero (6.21 ± 0.6 kg) and seven (5.80 ± 0.7 kg) days of aging. The yeast S. cerevisiae boulardii (0.5 g/day in the first phase) and the bacterium B. toyonensis (1.0 g/day in the second phase) used in the first and second phases, respectively, can effectively replace monensin in confinement diets without compromising carcass or meat quality.