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Performance, digestibility, microbial protein synthesis, and body composition of Brangus x Zebu steers on tropical pasture receiving supplementation

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Abstract

The use of additional supplement can affect ruminant performance by increasing the animal weight gain and maximizing profits from the activity. Thus, the objective of this study was to evaluate the influence of protein-energy supplementation on microbial synthesis, animal performance, nutrient digestibility, and body composition of Brangus x Zebu steers on pasture. The experiment lasted 160 days and included 36 animals divided into two groups; 18 steers received protein-energy supplementation (PES), and the other 18 received non-supplementation (NPES). Individual pasture intake and nutrient digestibility were estimated using the double indicator technique—chromium oxide and lignin in potassium permanganate. Spot urine samples were collected from 36 animals to determine creatinine, allantoin, and uric acid concentrations. All animals were slaughtered at the end of the experiment to evaluate body composition. There was increase in intake (P < 0.001) and dry matter digestibility (P = 0.01); it resulted in higher animal weight gain (P < 0.001) receiving supplementation. However, there was no difference (P > 0.05) in pasture nutrient intake between treatments. Supplementation increased microbial nitrogen (P < 0.001). For body composition, the model identity test that was applied showed no difference (P > 0.05) between the models, so it was adopted a common equation for both treatments. There was no difference (P > 0.05) for body composition between treatments. Therefore, the use of protein-energy supplementation for steers on pasture allowed higher microbial protein synthesis and better utilization of nutrients, which resulted in better animal performance. The use of protein-energy supplementation at 0.6% BW did not alter the carcass composition of Brangus x Zebu steers. However, it recommends protein-energy supplementation in pasture systems during the rainy period or using an irrigation system.

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Authors and Affiliations

  1. Laboratory of Animal Science, Campos dos Goytacazes, RJ, 28013-602, Brazil

    Felipe R. A. F. Valle, Carlos A. A. Fontes, Alberto M. Fernandes, Tadeu S. Oliveira & Renata S. T. Silva

  2. Federal Rural University of Rio de Janeiro, Campos dos Goytacazes, RJ, 28022-560, Brazil

    Tadeu S. Oliveira & Elizabeth F. Processi

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  1. Felipe R. A. F. Valle
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  2. Carlos A. A. Fontes
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  3. Alberto M. Fernandes
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  4. Tadeu S. Oliveira
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  6. Renata S. T. Silva
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Correspondence to Tadeu S. Oliveira.

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This study was performed in accordance with the recommendations found in the National Council Guide for Animal Experiments Control, and it was approved by the Ethics Committee for Animal Experimentation of the Universidade Estadual do Norte Fluminense Darcy Ribeiro, State of Rio de Janeiro, Brazil (168–2012 protocol).

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Valle, F.R.A.F., Fontes, C.A.A., Fernandes, A.M. et al. Performance, digestibility, microbial protein synthesis, and body composition of Brangus x Zebu steers on tropical pasture receiving supplementation. Trop Anim Health Prod 52, 2491–2498 (2020). https://doi.org/10.1007/s11250-020-02278-7

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