Hematological Reference Intervals Milk-Fed Calves During the First Four Weeks upon Arrival to the Farm
El objetivo de esta investigación fue establecer los intervalos de referencia hematológicos de los terneros alimentados con lactorreemplazador durante las primeras cuatro semanas de llegada al sistema de producción. Se utilizaron 80 neonatos Holstein lecheros (de 2 a 7 días de edad). Todos los terneros fueron alimentados con sustituto de leche propicia para este sistema de producción, dos veces al día. Las muestras de sangre para establecer los intervalos de referencia hematológicos en estos terneros se tomaron 24 horas después del arribo, a los 7 días, 14 días, 21 días y 28 días (5 muestras en 4 semanas). Se realizó un hemograma completo y medición de proteínas séricas totales, además, los terneros se pesaron a las 24 h y al día 28 después de su llegada. Se obtuvieron parámetros expresados en rangos mínimos y máximos de WBC 3.5 a 53.6 cellx109/L; neutrófilos segmentados 46,6 – 0,43 cellx109/L, linfocitos 13,4 – 1,1 cellx109/L; monocitos 2,7 – 0,2 cellx109/L; eosinófilos 0 - 0,8 célulasx109/L; basófilos 0 - 0.5 cellx109/L, RBC 5.2 a 12.1 cellx1012/L; HGB 61 a 153 g/L; HTC 0,18 a 0,45 L/L, MCV 24 a 47 fL, MCH 8 a 15 pg; y MCHC 298 a 354 g/L. Para estos 5 tiempos de muestreo, la proteína sérica total fue x̅ 5.11 g/100 mL, 4.76 g/100 mL, 4.63 g/100 mL, 4.65 g/100 mL y 5.14 g/100 mL. Se registró un aumento de peso x̅ 51,82 kg (mínimo 31.8 y máximo 72.6 kg). Dada la inexistencia de parámetros sanguíneos de referencia en este tipo de terneros, este estudio proporciona las bases para sustentar parámetros de referencia iniciales durante las primeras 4 semanas de llegada a los sistemas de producción (animales entre 30 y 37 días de edad).
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