System (400) and computer program for determining a performance parameter (200a, 200b, 200c, 200d, 200e, 200f, 200g, 200h), associated with reproduction of animals (110a, 110b, 110c) in a herd, at a herd level. The system (400) comprises: a first biomarker measurement unit (120a, 120b, 120c), configured to measure a first biomarker value； a database (140), configured to store the first biomarker measurement values； an output unit (160), configured to output information； and a control unit (150). The control unit (150) is configured to: obtain the first biomarker value, of each of the animals (110a, 110b, 110c)； determine outcomes of the performance parameter (200a, 200b, 200c, 200d, 200e, 200f, 200g, 200h)； compile the outcomes of the performance parameter (200a, 200b, 200c, 200d, 200e, 200f, 200g, 200h) into a single herd representative value (220)； compare the single herd representative value (220) with a reference value (210)； and generate an instruction to the output unit (160), to output information to the operator.
