Which gene was introduced in the first transgenic cow?

Milk produced by the transgenic cow 'Rosie' is enriched with which of the following?

Transgenic animals are produced for which of the following purposes?
$I$. To study the normal physiology and development
$II$. To study diseases
$III$. To obtain useful biological products
$IV$. To test the vaccine safety
$V$. To test the chemical safety
Which of the above statements are correct?

What is genetic engineering useful for producing?

Transgenic models do not exist for which of the following diseases?

The maximum number of existing transgenic animals is of which of the following?