Study questions

8. Over the years the number of cattle being sampled has expanded to over 700. This is primarily because each calf that is born to a cow in the study is ear-tagged and joins the study. It is decided to reduce this number to half. These cattle belong to various farmers with each farmer owning a minimum of about six head of cattle, and with some farmers many more. Bearing in mind that the success of this study has depended on the participation of farmers, say how you might go about doing this.

9. Insecticide impregnated traps and pour-on appeared to have similar effects on animal productivity. If you were an agricultural development officer which technology would you recommend? List the pros and cons for each technology.

10. CS10SAS shows how mean 6-monthly body weights etc. were calculated for each animal. See how far you can program GenStat to do the same calculations. Examples of some GenStat program statements are given in Case Study 2 and Case Study 6.