Zero (The number) (2) Livestock breeders (2) Childbirth (2) Cattle (2) Animals (2) Nacimiento (2) Estudio (2) Ganaderos (2) Ganado vacuno (2) Información (2) Animales (2) Cero (Número) (2) régression (2) Colombie (1) Genes (1) Origin (1) Databases (1) Reason (1) Race (1) Proportion (1) Progress (1) Production (Economic theory) (1) Population (1) Parents (1) Milk (1) Labor (Obstetrics) (1) Genetics (1) Generals (1) Evaluation (1) Creoles (1)