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ABSTRACT. Pasa C., Hatamoto-Zervoudakis L.K., Zervoudakis J.T. & Soares L. [Chelated mineral supplements for Nelore: quality and early embryonic development.] Suplementos minerais quelatados para vacas Nelore: qualidade e desenvolvimento embrionário inicial. Revista Brasileira de Medicina Veterinária, 36(1):29-34, 2014. Programa de Pós-Graduação em Ciência Animal, Faculdade de Agronomia e Medicina Veterinária, Universidade Federal do Mato Grosso, Av. Fernando Corrêa da Costa, 2367, Bairro Boa Esperança, Cuiabá, MT 78060-900, Brasil. E-mail: firstname.lastname@example.org The objective of this study was to evaluate the quality and early development of embryos produced with oocytes of cows supplemented with copper, zinc and selenium in a non-chelated and chelated. The experiment was conducted in Cuiabá-MT during the months April to July 2009. We used 24 adult Nellore multiparous, aged, average weights of the initial 36 months, 395 kg and mean body condition score 4.8, respectively randomly divided into 2 groups: control group (CG, supplemented with conventional mineral) and Supplemented Group (GS, animals supplemented with zinc, copper and selenium chelated. Each group was kept in a paddock of Brachiaria brizantha cv Marandu received 1 kg of animal per day. chelated mineral supplementation (GS) and conventional mineral (GC ) delivered via the protein supplement was given during a period of 99 days with daily average 1kg/cabeça. During the experimental period were two follicular aspirations, one to 59 days and another at 99 days of supplementation. Every two weeks the animals were weighed and ECC evaluated. oocytes viable (grades I, II and III) were used for in vitro production of embryos. The experiment was completely randomized and data were analyzed by ANOVA and a significance level of 10%. There was no effect (p> 0.10) of supplementation with chelated minerals on the percentage of cleaved oocytes, total embryos produced, percentage of produced embryos, cells in the morula stage, embryos in blastocyst stage embryos and expanded blastocyst stage assessed on day six of culture. Moreover, there was no effect of supplementation in the collection for a number of in vitro matured oocytes (IVM) (p = 0.0981, 24.9166 ± 4.2878 GC and GS 16.2500 ± 2.6057) , number of cleaved oocytes (p = 0.0902 for the GC animals and animals 13.9166 ± 2.4103; 9.0833 ± 1.2759 GS) and number of embryos to the blastocyst stage assessed in the initial 06 days (p = 0.0091, 2.7500 ± 0.4909 GC and GS 5.2857 ± 0.9184). Oral supplementation with minerals zinc, copper and selenium chelate via protein supplements at the levels and conditions for nutrient management in this experiment did not influence the parameters of percentage of cleaved oocytes, total number of embryos, percentage of embryos, cells in the morula stage, embryos in the blastocyst stage and expanded blastocyst evaluated on day 06 of cultivation, however had a significant effect for in vitro matured oocytes, cleavage and blastocyst stage embryos in the initial young Nelore cows.