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Important Gene Transfers in Animals of Economic Importance -

Gene Transferred Objective Achievements Remarks

Cattle, goat, sheep and swine
Human genes: α1-anti- Gene fanning trypsin, tissue plasminogen activator, blood clotting factor IX, and protein C

Gene Farming

Genes expressed in mammary tissue; proteins sec­reted in milk in functional form

Experimental stages

Sheep
Bacterial genes cysE and cysM (genes concerned with cysteine biosynthesis)

Improved wool production/quality

Genes expressed in transgenic animals  
Mice and Swine Human haemoglobin and specific circulating immunoglobulins (antibodies) Proteins from blood serum for blood transfusion and disease diagnosis Genes expressed; proteins released in blood serum Experimental stages
Swine and Sheep Human growth hormone Increased and desirable body growth

Improve body weight gain, feed efficiency, etc.

Joint pathology, skeletal defects, ulcers, etc.

Rabbits
Human genes: Interleukin 2, growth hormone, tissue plasminogen activator, etc. Bovine gene: ­ α -Lactoglobulin

Molecular farming or gene farming Recombinant proteins harvested from milk Experimental stage
Fish
Salmon or rainbow trout growth hormone Anti-freeze protein gene, α-globin gene, etc.
Increased body growth Variable Up to 60% increase in size Genes expressed in transgenics Growth improved by selection. Transgenes are stably inherited.