Effects of energy-protein supplementation frequency on performance of primiparous grazing beef cows during pre and postpartum

• Autor(a) principal: Moura, Felipe Henrique de
• Data de Publicação: 2020
• Outros Autores: Costa, Thaís Correia, Trece, Aline Souza, Melo, Luciano Prímola de, Manso, Marcos Rocha, Paulino, Mário Fonseca, Rennó, Luciana Navajas, Fonseca, Mozart Alves, Detmann, Edenio, Gionbelli, Mateus Pies, Duarte, Marcio de Souza
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://repositorio.ufla.br/jspui/handle/1/43081
• topic: Intake; Metabolism; Nitrogen recycling; Periparturient period; Tropical pastures; Gado - Suplementação dietética; Proteínas na nutrição mineral; Reciclagem de nitrogênio; Período periparto; Pastagens tropicais

Objective: Twenty-four pregnant Nellore primiparous grazing cows were used to evaluate the effects of energy-protein supplementation and supplementation frequency during pre (105 d before calving) and postpartum (105 d after calving) on performance and metabolic characteristics. Methods: Experimental treatments consisted of a control (no supplementation), daily supplementation (1.5 kg/d of concentrate/animal) and infrequent supplementation (4.5 kg of concentrate/animal every three days). During the pre and postpartum periods, concentrations of blood metabolites and animal performance were evaluated. Ureagenesis and energy metabolism markers were evaluated at prepartum period. Results: Supplementation frequency did not alter (p>0.10) body weight (BW), average daily gain (ADG), and carcass traits during pre and postpartum. The BW (p = 0.079), adjusted BW at day of parturition (p = 0.078), and ADG (p = 0.074) were greater for supplemented cows during the prepartum. The body condition score (BCS; p = 0.251), and carcass traits (p>0.10) were not affected by supplementation during prepartum. On postpartum, supplementation did not affect animal performance and carcass traits (p>0.10). The dry mater intake was not affected (p>0.10) by supplementation and supplementation frequency throughout the experimental period. Daily supplemented animals had greater (p<0.001) glucose levels than animals supplemented every three days. Supplementation and supplementation frequency did not alter (p>0.10) the levels of blood metabolites, neither the abundance of ureagenesis nor energy metabolism markers. Conclusion: In summary, our data show that the reduction of supplementation frequency does not cause negative impacts on performance and metabolic characteristics of primiparous grazing cows during the prepartum.