ArticleTranslational animal science2026
Effects of fixed and changing dietary forage neutral detergent fiber levels on ingestive behavior and blood biomarkers of Nellore bulls in the feedlot.
Article in Translational animal science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study investigated the effects of fixed and variable dietary forage neutral detergent fiber (fNDF) levels during the finishing feedlot period on ingestive behavior and blood biomarkers in Nellore bulls. Fifty-six Nellore bulls (initial BW: 460 ± 38 kg; age: 20 ± 1 months) were randomly allocated to four pens, with 14 animals per pen equipped with an automated feeding system (GrowSafe), the animal was considered the experimental unit. The study followed a completely randomized design. Bulls were fed for 100 d. dietary treatments were evaluated in two, fifty-day periods. In the first period (0-50 days), animals received diets with 12% or 7% fNDF. In the second period (51-100 days), one pen per treatment remained on the same diet, whereas the others switched fNDF levels (12%-7% step-down strategy or 7%-12% fNDF step-up strategy). Corn silage was used as the source of fNDF. Feeding, rumination, and resting behaviors were visually assessed by trained observers over 24 h on days 21, 42, 71, and 92. Blood samples were collected after each observation to determine lactate dehydrogenase (LDH), haptoglobin, and serum amyloid A (SAA) concentrations. Data were analyzed using the GLM procedure of SAS, considering a completely randomized design. Means were compared using Tukey's test (
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