Sombra artificial y estrés por calor en terneros de destete anticipado: respuestas fisiológicas, bioquímicas y productivas
Artificial shade and heat stress in early-weaned calves: physiological, biochemical, and productive responses
DOI:
https://doi.org/10.19137/cienvet.v28.10139Palabras clave:
Estres por calor, Sombra, TernerosResumen
El objetivo de este trabajo fue evaluar el efecto de la provisión de sombra artificial en verano sobre parámetros fisiológicos, metabólicos y productivos de terneros de raza británica en la región pampeana. Veinticuatro terneros (3 - 4 meses de edad) se asignaron a 12 corrales durante 64 días. La mitad de los corrales tuvo sombra (CS) y la otra mitad se dejó expuesta a la radiación solar directa (SS). La ganancia diaria de peso (GDP) y la eficiencia de conversión alimenticia (ECA) tendieron a ser mayores en CS que en SS. La frecuencia respiratoria (FR) fue menor en CS, mientras que la temperatura rectal (TR) a las 7:00 am tendió a ser 0,1 °C mayor en CS. A las 5:00 pm, la TR tendió a ser 0,2 °C mayor el día 5 y 0,2 °C menor el día 18 en CS que en SS. En la primera ola de calor (días 8 al 14 del experimento), los terneros de ambos grupos presentaron disminución en las concentraciones séricas de glucosa, colesterol y urea, y aumento en la concentración de la enzima glutamato oxalacetato transaminasa. El consumo de materia seca (CMS) y las concentraciones séricas de los metabolitos evaluados no fueron afectados por la sombra. En conclusión, la provisión de sombra a terneros de destete anticipado tendió a incrementar la GDP y la ECA y disminuyó la FR, sin afectar el CMS y el perfil metabólico evaluado, mientras que los efectos sobre la TR fueron de pequeña magnitud y fisiológicamente poco relevantes.
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Derechos de autor 2026 Gabriel Alberto Genero, Ignacio Azaldegui, Mateo Aristi, Gustavo Martín Lascalea, María Guillermina Bilbao, Claudio Fabián Tobal, Antonio Gerena, Mónica Alejandra Boeris, Gustavo Jaurena, Guillermo Héctor Pechin

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