Author

Lester R. Nolasco

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Open access Sep 2026

183. Effects of Low-dose Antimicrobial Feeding on the Ruminant Gastrointestinal Tract Lipid-soluble and Water-soluble Metabolite Profiles over Time.

Tylosin and monensin are commonly included in high-grain feedlot cattle diets to improve growth performance and feed efficiency. However, increasing concerns regarding antimicrobial resistance highlight the need to develop alternative strategies to reduce reliance on antibiotics. A more mechanistic understanding of h...

Lester R. Nolasco, Theresa Casey, Christina R. Ferreira et al. · Journal of Animal Science · 0 citations

Open access Sep 2026

182. Effects of Low-dose Antimicrobial Feeding on the Ruminant Gastrointestinal Tract Bile Acid Profile over Time.

A more mechanistic understanding of how antimicrobial supplementation (Tylosin plus Monensin) affects the ruminant gastrointestinal tract (GIT) in high grain diets may help accelerate the development of effective antibiotic alternatives. Previous work in swine has demonstrated that tylosin supplementation alters bile...

Lester R. Nolasco, Theresa Casey, Christina R. Ferreira et al. · Journal of Animal Science · 0 citations

Open access Sep 2026

188. Gastrointestinal Tract (GIT) Barrier Function in Stressed Feedlot Cattle Fed Essential Oils.

This study evaluated the effects of essential oil (EO) blends on physiological responses of feedlot cattle before transport (d 57), immediately after transport (d 65), and following a 4-week recovery period (d 92). Thirtytwo cross-bred heifers (265 ± 25.9 kg) were blocked by body weight and assigned to one of four tr...

Donald C. Herzog, Lester R. Nolasco, Rodrigo S. Torres et al. · Journal of Animal Science · 0 citations