Abstract
The objective of this study was to assess the impact of increasing levels of heat-treated soybean in the diet of crossbred cattle during the finishing phase on nutrient intake and digestibility, ruminal parameters, digesta passage rate, nitrogen balance, and microbial protein synthesis. Five steers, crossbred 7/8 Jersey x Zebu, fitted with rumen cannulas and with an average weight of 350 ± 50 kg, were utilized. The experimental treatments consisted of 0, 7, 14, 21, and 28% inclusion of heat-treated soybean in the total diet dry matter. The animals were randomly allocated in a 5 × 5 Latin square design. Evaluation of the animals took place over five experimental periods, each lasting 20 days. During each experimental period, the first 15 days were allocated for animal adaptation to the experimental diets, followed by five days of data collection. No significant differences were observed among the diets in terms of dry matter intake (average of 6.57 kg day−1; P = 0.615) and organic matter intake (average of 6.23 kg day−1; P = 0.832). However, heat-treated soybean had a significant impact on the digestibility of dry matter (P = 0.02), organic matter (P = 0.01), crude protein (P < 0.01), and neutral detergent fiber (P < 0.01). There was no observed change on microbial protein synthesis (average of 409.6 g day−1) in animals with the inclusion of heat-treated soybean in the diets. With each 1% inclusion of heat-treated soybean in the cattle diet, there was an increase of 0.00754 units in ruminal pH values and a reduction of 0.75839 mg dL−1 in ruminal ammoniacal nitrogen values. This study suggests that heat-treated soybean can be included in up to 15% of the dry matter in diets for finishing feedlot cattle.
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The data that support this study will be shared upon reasonable request to the corresponding author.
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Acknowledgements
The authors would like to thank the Federal University of Grande Dourados (UFGD) and National Council for Scientific and Technological Development (CNPq) for assistance with scholarships/research.
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This work was supported by CNPq and Capes grants.
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Orlando Filipe Costa Marques, Euclides Reuter de Oliveira, Jefferson Rodrigues Gandra, Eduardo Lucas Terra Peixoto, Nathálie Ferreira Neves1, Janaína Tayna Silva and Brasilino Moreira de Lima. The first draft of the manuscript was written by Orlando Filipe Costa Marques, Euclides Reuter de Oliveira, Eduardo Lucas Terra Peixoto, Andréa Maria de Araújo Gabriel and Flávio Pinto Monção and the other authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Marques, O.F.C., de Oliveira, E.R., Gandra, J.R. et al. Dietary replacement of soybean meal with heat-treated grain soybean in diets of feedlot-finished beef cattle: impacts on intake, digestibility, and ruminal parameters. Trop Anim Health Prod 56, 13 (2024). https://doi.org/10.1007/s11250-023-03862-3
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DOI: https://doi.org/10.1007/s11250-023-03862-3