Effects of age, parity, and pregnancy abnormalities on foal birth weight and uterine blood flow in the mare - Klewitz, J; Struebing, C; Rohn, K; Goergens, A; Martinsson, G; Ortgies, F; Probst, J; Hollinshead, F; Bollwein, H; Sieme, H (Theriogenology, 2015)