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    Because the non-protein nitrogen sources can be an option for a ruminant diet to replace true-protein sources, we hypothesized that using extruded urea in increasing levels by reducing soybean meal in the diet can maintain or improve the productive performance of beef cattle in a feedlot. It was aimed to evaluate the effects of extruded urea levels on the productive performance and carcass and meat characteristics of Nellore steers in feedlot. Twenty-four Nellore steers, with an average age of 22 months and an average initial weight of 333.5 kg, were used. A completely randomized design was used with four treatments: 50, 60, 70, and 80 g/100 kg BW of extruded urea. There was no effect of extruded urea levels on nutrient intake. The final weight and average daily gain were adjusted by a quadratic equation, with maximum estimated values of 479.18 kg and 1.02 kg/day with the inclusion of 59.71, 54.14, and 54.16 g/100 kg BW of extruded urea, respectively. There was no effect (P > 0.05) of extruded urea levels on hot carcass weight (233.3 kg), carcass yield (53.2%), ribeye area (72.7 cm2), and subcutaneous fat thickness (5.3 mm). Likewise, there was no effect (P > 0.05) of extruded urea levels on meat chemical composition, shear force (8.9 KgF), cooking losses (28.2%), pH (5.6), and meat color parameters. We recommended the use of 70 g/100 kg BW of extruded urea in the diet for finishing Nellore steers in confinement. © 2023. The Author(s), under exclusive licence to Springer Nature B.V.

    Citation

    Luís Carlos Vinhas Ítavo, Camila Celeste Brandão Ferreira Ítavo, Marina de Nadai Bonin Gomes, Vanessa Zirondi Longhini, Gelson Dos Santos Difante, Alexandre Menezes Dias, Eduardo de Souza Leal, Manoel Gustavo Paranhos da Silva, Ana Hellen da Silva, Laura Beatriz Perez da Silva, Rafael Goes Cardoso Paro, Marcos Jácome de Araújo, Tairon Pannunzio Dias Silva, Antonio Leandro Chaves Gurgel. Effects of extruded urea levels on the productive performance and carcass and meat characteristics of Nellore cattle. Tropical animal health and production. 2023 Jun 23;55(4):247

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    PMID: 37351642

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