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Piccand, V; Meier, S; Cutullic, E; Weilenmann, S; Thomet, P; Schori, F; Burke, C R; Weiss, D; Roche, J R; Kunz, P L (2011). Ovarian activity in Fleckvieh, Brown Swiss and two strains of Holstein-Friesian cows in pasture-based, seasonal calving dairy systems. Journal of Dairy Research, 78(4):464-470.