Which one of the following products was produced as a result of DNA manipulation in the first transgenic cow 'Rosie' ?

The correct option is α-lactalbumin.

Step-by-Step Explanation:

In 1997, the first transgenic cow, named Rosie, was produced. Rosie was genetically engineered to produce human protein-enriched milk.

The milk produced by Rosie contained the human protein human alpha-lactalbumin (specifically, $\alpha$-lactalbumin) at a concentration of approximately 2.4 grams per liter.

This protein-enriched transgenic milk was much more nutritionally balanced and suitable for human babies than natural cow's milk, which lacks this specific human protein.

Therefore, the product produced as a result of DNA manipulation in the first transgenic cow 'Rosie' is α-lactalbumin.