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RESUMO.[Perfil bioquímico clínico de matrizes Quarto de Milha alimentadas com feno e haylage Tifton 85 (Cynodon spp.)] A conservação do haylage (alimento pré‐seco) pode ser desafiadora, considerando o aumento do risco de crescimento de fungos, com consequente produção de micotoxinas. Entretanto, quando a qualidade da higiene e armazenamento é assegurada, o haylage aumenta a palatabilidade da forragem e fornece suplemento de matéria seca suficiente ao longo do ano. Devido à falta de informação relativa aos efeitos dessa alimentação nos parâmetros sanguíneos de equinos alimentados exclusivamente com essa dieta, o objetivo do presente estudo é avaliar o perfil bioquímico sanguíneo dos equinos após administração da haylage em comparação com feno. Doze matrizes Quarto de Milha foram distribuídas em dois grupos, cada um recebendo feno ou haylage de Tifton 85 (Cynodon spp.) por um período de 28 dias. O perfil bioquímico foi realizado em cinco tempos (T) diferentes (T0, antes do início do experimento e cronologicamente, a cada ABSTRACT.Guimarães T.C., Rezende A.S.C., Costa M.L.L., Ferreira M.G., Miranda A.L.S., Botelho A.F.M., Soto‐Blanco B. & Melo M.M. 2019. Clinical biochemistry profile of American Quarter Horse broodmares fed Tifton-85 (Cynodon spp.) hay and haylage. Pesquisa Veterinária Brasileira 39(5):317-323. Escola de Veterinária, Universidade Federal de Minas Gerais, Avenida Antônio Carlos 6627, Cx. Postal 567, Campus Pampulha, Belo Horizonte, MG 31270‐ 901, Brazil. E-mail: mariliamartinsmelovet@hotmail.com The conservation of haylage (a pre‐dried feed) can be challenging, since there is an increased risk of mould growth, which can contaminate this foodstuff with mycotoxins. However, when the hygienic quality is secured, haylage enhances grass palatability and provide enough supply of dry matter throughout the year. Due to the lack of information regarding its effect on blood parameters in horses fed exclusively with this foodstuff, the aim of this study is to provide information regarding its use in comparison to hay and ensure that it does not affect horses’ biochemical profile. Twelve Quarter Horse broodmares were distributed into two groups, each fed with Tifton‐85 (Cynodon spp.) hay or haylage for a period of 28 days, and the biochemical profile was done in five different times (T0 before the experiment started and, chronologically, seven days apart ‐ T1, T2, T3 and T4), It was analyzed total protein (TP) and its fractioning; enzymes alanine aminotransferase, aspartate aminotransferase and γ‐glutamyl‐transferase; endogenous catabolism products urea and creatinine; and ions calcium and phosphorus. Mycotoxins in haylage were also investigated and remained below the legislation thresholds. Only TP was higher in the last sampling (T4) of the haylage group, which may be related to the foodstuff’s higher protein digestibility. No differences were observed between serum enzymes, urea, creatinine and Ca/P from both experimental groups. Haylage has proven to be safe, when well prepared for horses, without causing impairing side effects, as shown by the normal serum biochemistry parameters presented in this study.