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Yerba mate (Ilex paraguariensis) as a source of antioxidants with soybean grain in supplementation of lactating ewes reared in tropical pastures

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Abstract

The hypothesis tested is that the association of soybean grain and yerba mate as an antioxidant source can increase the concentration of polyunsaturated fatty acids (PUFA) with lower oxidation of milk from lactating ewes reared in tropical pastures. Sixteen ewes were randomly distributed in a 2x2 factorial scheme (with or without yerba mate at 110 g / kg of dry matter (DM); with or without soybean grain at 210 g/kg of DM). Yerba mate intake reduced DM intake, and concentrations of ether extract (EE), protein, lactose, defatted dry extract, density, omega-3 concentrations, and the ratio between saturated/monounsaturated fatty acids (FA), but increased the concentration of monounsaturated FA and the sequestering power of free radicals by DPPH without altering the concentrations of conjugated dienes and the concentrations of substances reactive to thiobarbituric acid in milk. Supplementation with soybean grain decreased the birth weight of the lambs and increased the concentrations of conjugated linoleic acid (CLA), PUFA, omega - 6, omega ratio - 6/omega – 3, and total blood cholesterol. The addition of yerba mate did not influence the oxidative profile of milk. Supplementation with soybean grain improved the FA profile of milk, increasing the concentrations of CLA and PUFA. The results suggest that the association of yerba mate and soybean grain helps to improve the fat quality of milk from ewes raised in tropical pastures, as shown by the enhanced antioxidant activity, although it does not help prevent oxidation of milk rich in PUFA.

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Funding

This work was supported by the Federal University of Mato Grosso do Sul, the Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq, the Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul- FUNDECT, and the Cordenação de Aperfeiçoamento de Pessoal de Nível Superior-Capes (Financing Code 001).

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ESMS, CCBFI, LCVI, and CEDN conceived and designed research and wrote the manuscript. TFFA, GTS, GKAM, JACO, and ACPV contributed to the data analysis and discussion of the results and reviewed the manuscript. AASM, CG, and PBA conducted the experiment, laboratory analysis, and collection of samples. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Luís Carlos Vinhas Ítavo.

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The experiment was conducted in the Sheep Sector of the Federal University of Mato Grosso do Sul (UFMS), Brazil. The experimental protocol was approved by the Ethics Committee on the Use of Animals of UFMS (number 1.119/2019).

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de Melo Soares, É.S., Ítavo, C.C.B.F., Ítavo, L.C.V. et al. Yerba mate (Ilex paraguariensis) as a source of antioxidants with soybean grain in supplementation of lactating ewes reared in tropical pastures. Trop Anim Health Prod 55, 13 (2023). https://doi.org/10.1007/s11250-022-03427-w

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