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Answer: The first transgenic cow was developed in 1997, named Rosie. It consists of the human alpha-lactalbumin gene. The milk of the transgenic cow produced proteins in their milk, their milk contained about 2.4 grams of human protein per liter of milk and was found to be more nutritionally balanced for human bodies than that of the natural cow milk. However, this protein is only in mammary tissue which means that this will only be found in the cow’s milk and can only be extracted from there.
The transgenic cows are kept separate from regular herds. Transgenic cows look identical to normal cows. Researchers use ear tags and microchips to identify transgenic cows and their calves. One of the aims of the research program is to show that transgenic cows pass on their transgenes to subsequent generations.
Making a transgenic cow is a multistep process. First, the gene for the desired product is identified and sequenced. Then a gene construct containing this desired gene is created using DNA cloning, digestion, and then the gene construct is then introduced into female bovine (cow) cells by transfection.