Minerals (1) Variations (1) Sampling (1) Reproduction (1) Production (Economic theory) (1) Nutrition (1) Nitrogen (1) Milk yield (1) Milk (1) Metabolism (1) Materials (1) Livestock (1) Human behavior (1) Hormones (1) Grazing (1) Force and energy (1) Food (1) Dynamics (1) Dairy cattle (1) Consumption (Economics) (1) Cattle (1) Attachment and garnishment (1) Leche--Producción (1) Toma de muestras (1) Demanda (1) Energía (Física) (1) Ganado vacuno de leche (1) Variaciones (1) Reproducción (1) Ganado (1)