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This review explores environmental change in northern and south-central Kenya, roughly covering three decades from the 1960s to the 1990s.
Con el objeto de conocer las concentraciones sanguíneas de Triyodotironina (T3) y Tiroxina (T4) en vacas lecheras en el sur de Chile, se seleccionaron 110 muestras de sangre de vacas Frison Negro, 55 pertenecian a vacas al inicio de lactancia y 55 a vacas en el período final de gestación.
One of the greatest challenges faced by mankind is to satisfy the needs of the fast growing global population and at the same time preserve land, water, air and biodiversity resources. Livestock are a crucial element in this balancing process.
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