Lamb Cost of Production Model March 30, 2016 12:00 am Tesco is to trial a cost of production model for lamb. Data will be collected from 100 producers over a 12 month period. The retailer invited producers to apply to take part in the trial back in February and a group has now been selected which covers a variety of production systems and regions. If the trial is successful Tesco will be the first major supermarket to implement such a model.