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Finishing of grazing crossbred steers supplemented with detoxified castor bean meal (Ricinus communis L.) in the rainy-dry transition period

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Abstract

This study evaluated levels of replacement of soybean meal by castor bean meal in the finishing crossbred steers on Brachiaria brizantha cv. Marandu pasture during the rainy-dry transition period. Forty Holstein-Zebu crossbred steers with an average initial weight of 395.93 ± 10 kg were randomly allocated to four treatment groups that were supplemented with concentrate levels of replacing (0, 290, 613, and 903 g/kg DM of the supplement; at 0.4% body weight [BW]). The experimental period was 120 days. A completely randomized experimental design was adopted; with regression analysis using the computational software package (SAS 9.2, USA). Intake and digestibility of dry matter (DM) and nutrients and animal performance were evaluated. The replacement levels did not influence (P > 0.05) the intakes of DM (kg/day), organic matter (OM, kg/day), neutral detergent fiber (NDF, kg/day and %BW), non-fibrous carbohydrates (NFC, kg/day), or total digestible nutrients (kg/day). However, the intake of crude protein (CP) and ether extract (EE, kg/day) decreased as the replacement levels were increased (P < 0.05). The digestibility of DM, OM, NDF, and EE did not change, whereas CP digestibility decreased linearly and NFC digestibility increased linearly (P < 0.05). The replacement levels did not affect (P > 0.05) final body weight, average daily gain, feed conversion, and carcass yield. Castor bean meal can replace up to 903 g/kg DM of soybean meal in the composition of the supplement without compromising the performance of steers on Marandu pasture during the rainy-dry transition period.

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Funding

I declare that the research was financed by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES, The Universidade Estadual do Sudoeste da Bahia-UESB and Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq.

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  1. Department of Animal Science, Universidade Estadual do Sudoeste da Bahia (UESB), Juvino Oliveira Campus, Itapetinga, Bahia, Brazil

    Osman Ronaldo Aguilar Melgar, Robério Rodrigues Silva, Fabiano Ferreira da Silva, Laize Viera Santos, Antônio Carlos Ribeiro Lima, Silvia Layse Mendes Machado, Marceliana da Conceição Santos, Tarcísio Ribeiro Paixão, João Williams Dias Silva & Gabriel Dallapicola Da Costa

  2. Department of Animal Science, Universidade Federal da Bahia (UFBA), Bahia, Brazil

    Gleidson Giordano Pinto de Carvalho

  3. Department of Veterinary Science, Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil

    Wbeimar Yamith Sanchez Dueñez

  4. Department of Animal Science, Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil

    Diana Carolina Cediel Devia

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  1. Osman Ronaldo Aguilar Melgar
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Correspondence to Osman Ronaldo Aguilar Melgar.

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I declare that there is not conflict of interest between the authors of the article “Finishing of grazing steers supplemented with detoxified castor bean meal (Ricinus communis L.) in the rainy-dry transition period” submitted for consideration in the Journal Tropical Animal Health and Production.

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Melgar, O.R.A., Silva, R.R., da Silva, F.F. et al. Finishing of grazing crossbred steers supplemented with detoxified castor bean meal (Ricinus communis L.) in the rainy-dry transition period. Trop Anim Health Prod 56, 111 (2024). https://doi.org/10.1007/s11250-024-03953-9

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