Draw the data model for the following. Be sure to indicate the primary key and foreign keys in the model. Use visio.

A sheep farmer shears his sheep every year, at which time he weighs and grades the fleece, a score between 1 and 10 based on the quality of the wool. He has several breeds of sheep and has asked you to create a database so that he can compare the performance of these breeds over an extended period. He has a small farm, so each sheep has a name and identifying ear tag. Draw a data model of this situation.