Which of the following animals are the most common transgenic animals?

Some genes of transgenic animals are made .....$X$..... to certain .....$Y$..... substances.

Consider the following statements:
$I$. Transgenic animals are more sensitive to toxic substances than non-transgenic animals.
$II$. Useful biological products can be produced by introducing into transgenic animals the portion of $DNA$ which codes for a particular product.
$III$. Brazzein is a protein produced by a West African plant,$Pentadiplandra$ $brazzeana$,which is approximately $2000$ times as sweet as sugar.
Which of the statements given above are correct?

Which vaccine was the first to be tested using transgenic mice?

The first transgenic cow,'Rosie',was produced in the year .........

What are animals called whose $DNA$ has been manipulated to possess and express an extra (foreign) gene?