Six pairs of twin lambs are to be used as blocking factors in an investigation into weight gains achievable from three protein additives added to...

Six pairs of twin lambs are to be used as blocking factors in an investigationinto weight gains achievable from three protein additives added to theirnormal diet. A control group where no additive is included in the diet isalso to be assessed. Using twins means that only two diet variations can betested at each blocking level. Construct this design and explain your reasonfor this particular construction.