Resumo

VICENTE PEREZ, Arnulfo et al. Evaluation of the biochemical and hematological profiles of feedlot hair sheep after the supplementation with generic zilpaterol hydrochloride. Rev. mex. de cienc. pecuarias [online]. 2020, vol.11, n.4, pp.1208-1219.  Epub 02-Mar-2021. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v11i4.5192.

This study aimed to evaluate zilpaterol hydrochloride (ZH, generic) supplementation on fattening hair sheep, using hematological and biochemical variables as health status indicators. A total of 32 hair lambs (Dorper x Pelibuey) were grouped by initial weight and randomly assigned into four treatments: T1= basal diet (control group), T2= basal diet supplemented with ZH at 0.10 mg·kg-1 of LW d-1 (Grofactor®, Virbac México, Guadalajara, Mexico), T3= basal diet supplemented with ZH at 0.20 mg·kg-1 of LW d-1, and T4= basal diet supplemented with ZH at 0.30 mg·kg-1 of LW d-1. Blood samples were collected on days 1, 15, and 30 of the study. The hematological profile was determined in fresh blood samples; metabolites, electrolytes, and hormones were determined in serum samples. The study followed a randomized complete block experimental design, using an orthogonal polynomial analysis to determine the trend of the responses at the different concentrations of ZH. Cholesterol and urea levels were higher (P<0.05) in T3 than in T2. Furthermore, the mean corpuscular hemoglobin concentration was higher (P<0.05) in T1 than in T3; the red blood cell distribution width was higher (P<0.05) in T2 and T3 than in T4. The Na levels and the number of platelets showed a linear trend (P <0.05) to decrease and increase, respectively, as ZH levels increased. A quadratic trend was observed (P<0.05) in mean corpuscular hemoglobin concentration and red blood cell distribution width with increasing dose of ZH (generic). The remaining variables did not show significant trends at ZH levels (generic). The values of the biochemical and hematological profiles were within the reference range, which suggests that the addition of ZH did not alter the health status of fattening lambs.

Palavras-chave : Hemoglobin; Lambs; Metabolites; Electrolytes; Zilpaterol hydrochloride.

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