Yeast culture added to the diet improves the performance of feedlot steers
DOI:
https://doi.org/10.5433/1679-0359.2025v46n6p1875Keywords:
Carcass fat, Saccharomyces cerevisiae, Weight gain.Abstract
To meet the growing demand for beef, various technologies have been adopted to improve cattle performance and feed efficiency, such as intensive systems and dietary additives. This study evaluated the productive performance of feedlot-finished steers with yeast culture (Saccharomyces cerevisiae), either combined with or without sodium monensin in their diet. The 140-day experiment used 240 ½ Angus x ½ Nellore steers from the same herd. The steers were 13.8 ± 1.0 months of age and had 421 ± 5 kg initial body weight. The completely randomized experimental design consisted of two treatments and six repetitions, with each repetition represented by a pen containing 20 animals. The treatments were (1) diet with sodium monensin (250 mg animal-1 day-1), and (2) diet with yeast culture plus sodium monensin (7 g animal-1 day-1 + 250 mg animal-1 day-1). The diets consisted of a mixture of 40% corn silage and 60% concentrate, provided ad libitum. Using yeast culture combined with sodium monensin promoted higher average weight gain (1.324 vs. 1.083 kg day-1) and consequently higher body weight at slaughter (565.3 vs. 537.6 kg) and hot carcass weight (312.6 vs. 296.8 kg) compared to the diet with only sodium monensin. Furthermore, adding yeast culture to the diet promoted greater carcass gain (103.7 vs. 85.3 kg) and higher average daily carcass gain (0.947 vs. 0.819 kg day-1) than the treatment with sodium monensin alone. The addition of yeast culture combined with sodium monensin to the diet increased the average daily gain by 22.2% and the daily carcass gain by 15.6%, so it is recommended for finishing steers in a feedlot.
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Copyright (c) 2026 Mikael Neumann, Paulo Victor Pinheiro Cesar, Luisa Da Costa Venancio , Paulo Eduardo Piemontez de Oliveira, Valéria Kalinovski, Ellen Baldissera, Valter Harry Bumbieris Junior, Bárbara Peterlini Felicio, Beatrix Coltri Kok, Maria Eduarda de Oliveira Poleto
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