Obstetrical assistance and neonatal vitality in dairy Holstein cows - Vannucchi, Camila Infantosi; Silva, L. C. G; Silva Júnior, R. A; Mesquita, B. S; Mingoti, R. D; Freitas, B. G; Vechiato, T. A. F; Risolia, P. H (International Ruminant Reproduction, 2010)