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26 pairs of monozygotic twin heifers from dairy herds in Germany [German Red Pied and German Black Pied?] were divided into 3 groups and observed over the following 3 periods [date and location not given]: aged 4-13 or 4-15 months; aged 4-10 or 4.0-11.5 months; and aged 7-10 or 7-11 months....

Andreae, U.; Müller, C.
Landbauforschung Völkenrode, 1997, 47, 4, pp 147-158