Influence of energy supplementation on associative effects in Nellore bulls on a tropical pasture during the rainy season

Authors

DOI:

https://doi.org/10.5433/1679-0359.2021v42n4p2585

Keywords:

Beef cattle, Grazing, Productive performance.

Abstract

The objective of this study was to evaluate the influence of energy supplementation on associative effects between forage and concentrate supplements and on the performance of beef cattle on a tropical pasture during the rainy season. Twenty-eight Nellore bulls averaging 19 months of age and 325.2 ± 4.1 kg were allotted to a completely randomized design and distributed into four paddocks of two hectares each with a tropical pasture for 84 d. The treatments consisted of bulls on Urochloa brizantha cv. Xaraés pasture without concentrate supplementation or bulls on Urochloa brizantha cv. Xaraés pasture receiving concentrate supplementation at 15 (S15), 30 (S30) or 45% (S45) of the total digestible nutrients (TDN) requirement. All bulls had ad libitum access to mineral supplementation. The amount and chemical composition of the supplement were adjusted every 28 d. Forage and supplement intakes were evaluated in all animals using fecal markers. Crude protein: digestible organic matter ratio decreased with supplementation; consequently, the imbalance between dietary protein and energy increased. Forage intake decreased with increasing supplementation. The substitution rates of pasture for supplementary feed were 0.14, 0.33, and 0.46 for bulls from S15, S30, and S45 treatments, respectively. However, the apparent DM digestibility increased linearly with supplementation level. Supplementation improved the assimilation of ammonia-N in the rumen. Energy supplementation for Nellore bulls on tropical pastures during the rainy season provides excess energy relative to protein, resulting in a substitution effect of supplement intake on forage intake. Moreover, energy supplementation does not improve body weight gain. Protein sources should be added to supplements for balancing protein and energy levels, thereby reducing a likely substitution effect.

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Author Biographies

Mariane Stahlhofer, Universidade Estadual do Oeste do Paraná

PhD Studentsof Animal Science, Universidade Estadual do Oeste do Paraná, UNIOESTE, Marechal Cândido Rondon, PR, Brazil.

Ériton Egidio Lisboa Valente, Universidade Estadual do Oeste do Paraná

PhD Prof., Animal Science, Graduate Faculty, UNIOESTE, Marechal Cândido Rondon, PR, Brazil

Lívia Vieira de Barros, Universidade Federal do Mato Grosso

PhD, Profa. of Animal Science, Graduate Faculty, Universidade Federal do Mato Grosso, UFMT Cuiabá, MT, Brazil.

Matheus Leonardi Damasceno, Universidade Estadual do Oeste do Paraná

PhD Student of Animal Science, Universidade Estadual do Oeste do Paraná, UNIOESTE, Marechal Cândido Rondon, PR, Brazil.

Mariana Barbizan, Universidade Estadual do Oeste do Paraná

PhD Student of Animal Science, Universidade Estadual do Oeste do Paraná, UNIOESTE, Marechal Cândido Rondon, PR, Brazil.

Brenda Vieira Rocha Melo, Universidade Estadual do Oeste do Paraná

Animal Scientist, UNIOESTE, Marechal Cândido Rondon, PR, Brazil.

Stefani Natani dos Santos Arndt, Universidade Estadual do Oeste do Paraná

M.e Student of Animal Science, UNIOESTE, Marechal Cândido Rondon, PR, Brazil.

Sarah Stefany da Silva, Universidade Estadual do Oeste do Paraná

Animal Scientist, UNIOESTE, Marechal Cândido Rondon, PR, Brazil.

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Published

2021-05-20

How to Cite

Stahlhofer, M., Valente, Ériton E. L., Barros, L. V. de, Damasceno, M. L., Barbizan, M., Melo, B. V. R., … Silva, S. S. da. (2021). Influence of energy supplementation on associative effects in Nellore bulls on a tropical pasture during the rainy season. Semina: Ciências Agrárias, 42(4), 2585–2598. https://doi.org/10.5433/1679-0359.2021v42n4p2585

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