EVALUATION OF ENERGY AND PROTEIN SOURCES ON DIETS FOR FINISHING BULLS

Authors

  • Rafael Luis Clarindo Universidade de São Paulo (USP), São Paulo, São Paulo, Brasil
  • Flávio Augusto Portela Santos Universidade de São Paulo (USP), São Paulo, São Paulo, Brasil
  • Carla Maris Machado Bittar Universidade de São Paulo (USP), São Paulo, São Paulo, Brasil
  • Hugo Imaizumi Universidade de São Paulo (USP), São Paulo, São Paulo, Brasil
  • Narson Vinicius dos Anjos Lima Universidade de São Paulo (USP), São Paulo, São Paulo, Brasil
  • Eduardo Menegueli Pereira Universidade de São Paulo (USP), São Paulo, São Paulo, Brasil

Keywords:

Produção de bovinos

Abstract

In this study it was evaluated the replacement of a true protein source (soybean meal) by a non-protein nitrogen source (urea) in combination with two starch sources, fine ground corn and fine ground sorghum, in diets for feedlot finished cattle. Twenty four yearling bulls (16 Nelore and 8 Canchim), averaging 417 kg initial body weight and 15 months old were used. Animals were housed in 24 individual concrete floor pens for 90 days. Randomized complete blocks were used for the statistical design. Rations contained 20% Tifton hay and 80% concentrate. Treatments were fine ground corn + soybean meal (MFS), fine ground corn + urea (MU), fine ground sorghum + soybean meal (SFS), fine ground sorghum + urea (SU). According to NRC (1996) all treatments had positive metabolizable protein balances. There were no effects of energy sources on animal performance (p<0.05). Animals fed soybean meal had greater average daily gain and feed efficiency than those fed urea (p<0.05).

KEY WORDS: High grain, non protein N, rumen degradable protein, soybean meal, urea.

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Published

2008-12-21

How to Cite

CLARINDO, Rafael Luis; SANTOS, Flávio Augusto Portela; BITTAR, Carla Maris Machado; IMAIZUMI, Hugo; LIMA, Narson Vinicius dos Anjos; PEREIRA, Eduardo Menegueli. EVALUATION OF ENERGY AND PROTEIN SOURCES ON DIETS FOR FINISHING BULLS. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 9, n. 4, p. 902–910, 2008. Disponível em: https://revistas.ufg.br/vet/article/view/1144. Acesso em: 5 dec. 2025.

Issue

Vol. 9 No. 4 (2008)

Section

Animal Production

License

Copyright (c) 2008 Brazilian Animal Science/ Ciência Animal Brasileira

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