Effect of forage quality and narasin inclusion on ruminal fermentation, nutrient intake, and total tract digestibility of Nellore steers

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorState University-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorde Paula, Matheus Felipe Freitas Viana-
Autor(es): dc.creatorMarques, Rodrigo S.-
Autor(es): dc.creatorPires, Alexandre Vaz-
Autor(es): dc.creatorSoares, Letícia Carolina Bortolanza-
Autor(es): dc.creatorLimede, Arnaldo Cintra-
Autor(es): dc.creatorFerreira, Evandro Maia-
Autor(es): dc.creatorPolizel, Daniel Montanher-
Data de aceite: dc.date.accessioned2025-08-21T23:45:06Z-
Data de disponibilização: dc.date.available2025-08-21T23:45:06Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1093/tas/txae107-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/308358-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/308358-
Descrição: dc.descriptionThe study aimed to evaluate the effects of forage quality and narasin inclusion on intake, digestibility, and ruminal fermentation of Nellore steers. Twenty-eight rumen-cannulated Nellore steers (initial body weight [BW] = 350 ± 32.4 kg) were allocated to individual pens in a randomized complete block design, with 7 blocks, defined according to the fasting BW at the beginning of the experiment. The steers were randomly assigned within blocks to 1 of 4 experimental diets in 2 × 2 factorial arrangements, being the first-factor forage quality (MEDIUM = 81 g of CP/kg of dry matter [DM], and HIGH = 153 g of CP/kg of DM), and the second factor was the inclusion (N13 = diet plus 13 mg/kg of DM of narasin) or not (N0) of narasin (Zimprova; Elanco Animal Health, São Paulo, Brazil). The experiment consisted of a 28-d period with 22 d for adaptation and the last 6 d for data collection. No haylage quality × narasin interaction (P ≥ 0.68) was observed on DM and nutrient intake. Haylage quality affected (P ≤ 0.01) DM intake, with greater values observed for steers fed HIGH compared with MEDIUM haylage. There was an increase (P < 0.001) in OM, NDF, hemicellulose, and CP intake for steers consuming HIGH vs. MEDIUM haylage. Including N13 did not affect (P > 0.39) DM and nutrient intake of steers. No haylage quality × narasin interactions were detected (P ≥ 0.60) for total tract nutrient digestibility. However, steers fed with HIGH haylage showed an increase (P > 0.001) in DM and digestibility of all nutrients compared with MEDIUM. Steers fed a MEDIUM haylage had a greater (P < 0.01) proportion of acetate compared with steers fed HIGH during all evaluated hours. Steers fed HIGH haylage had a greater (P < 0.01) proportion of propionate at 0 h compared with steers consuming MEDIUM, whereas at 12 h, steers consuming MEDIUM hay had a greater (P < 0.01) proportion of propionate vs. HIGH haylage. A haylage quality × narasin and haylage quality × time of collection interactions were detected (P ≤ 0.03) for rumen ammonia concentration, which was reduced (P < 0.03) in N13 vs. N0 steers consuming HIGH haylage. Collectively, high-quality haylage allows increased consumption and digestibility, with more energy-efficient ruminal fermentation. In addition, narasin might be an important nutritional tool in forage-based diets to enhance the ruminal fermentation parameters of Bos indicus Nellore steers.-
Descrição: dc.descriptionDepartment of Nutrition and Animal Production FMVZ University of São Paulo, SP-
Descrição: dc.descriptionSchool of Animal Sciences Virginia Polytechnic Institute State University-
Descrição: dc.descriptionDepartment of Animal Science College of Agriculture “Luiz de Queiroz,” University of São Paulo, SP-
Descrição: dc.descriptionDepartment of Biology and Animal Science São Paulo State University “Julio de Mesquita Filho”, SP-
Descrição: dc.descriptionDepartment of Biology and Animal Science São Paulo State University “Julio de Mesquita Filho”, SP-
Idioma: dc.languageen-
Relação: dc.relationTranslational Animal Science-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectfeed additives-
Palavras-chave: dc.subjectforage quality-
Palavras-chave: dc.subjectionophore-
Palavras-chave: dc.subjectnarasin-
Palavras-chave: dc.subjectruminal fermentation-
Título: dc.titleEffect of forage quality and narasin inclusion on ruminal fermentation, nutrient intake, and total tract digestibility of Nellore steers-
Tipo de arquivo: dc.typelivro digital-
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