Supplementation of dairy cows with propylene glycol during the periparturient period: effects on body condition score, milk yield, first estrus post-partum, 'beta'-hydroxybutyrate, non-esterified fatty acids and glucose concentrations - Laranja-da-Fonseca, Luís Fernando; Rodrigues, Paulo Henrique Mazza; Santos, Marcos Veiga dos; Lima, André Pinto; Lucci, Carlos de Sousa (Ciência Rural, 2004)