Efficiency of Amino Acid Utilization in Nellore Cattle Grazing Low-Quality Forage Supplemented with Different Sources of Nitrogen

Autor: Ana Veronica Lino Dias, Juliana Duarte Messana, Yury Tatiana Granja-Salcedo, Yeison Fabian Murilo Alfonso, Lorrayny Galoro Silva, Karine Dalla Vecchia Camargo, Kênia Larissa Gomes Carvalho Alves, Paloma Helena Gonçalves, Ricardo Andrade Reis, Telma Teresinha Berchielli
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Life, Vol 13, Iss 8, p 1622 (2023)
Druh dokumentu: article
ISSN: 2075-1729
DOI: 10.3390/life13081622
Popis: This study aimed to evaluate the effects of supplementation with non-protein nitrogen (NPN) or ruminal undegradable protein (RUP) on intake, digestibility, and amino acid (AA) use efficiency of Nellore cattle grazing during the dry season. Eight Nellore steers (12 ± 2 months old) were used in quadruplicate Latin squares (2 × 2). The animals were placed on Urochloa brizantha cv. Xaraés under continuous grazing. The treatments included the following: (1) urea supplementation (NPN) and (2) supplementation of corn gluten meal 60 (CGM, RUP). Animals supplemented with CGM showed higher intakes of dry matter (DM) supplement, total AA, essential AA, and individual AA. The supplementation did not affect the total AA digestibility, total AA flux, and the AA fluxes of microbial origin and RUP from the diet (p > 0.05). The ruminal microorganism origin flux of total AA to the duodenum was 44.5% and 52.7% for animals supplemented with NPN and CGM, respectively. Animals supplemented with CGM showed an increase in blood concentrations of isoleucine (+19.09 μmol/L), cystine (+27.29 μmol/L), and albumin (+0.11 g/dL) (p < 0.05), but this increase was not accompanied by an improvement in N use efficiency of steers (p > 0.05). RUP supplementation via CGM can be an efficient nutritional strategy to enhance the intake and absorption of AA by Nellore cattle grazing low-quality forage during the dry season.
Databáze: Directory of Open Access Journals
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