(i) Sheep farming is a good business in Australia. Wool and meat are obtained from sheep. Sheep eat grass like clover. Clover grass is low in sulfur and does not improve wool. Transgenic clover grass has been created by introducing sulfur producing genes from sunflower into clover grass. By eating this grass, the sulfur deficiency of the sheep was compensated and the wool quality of the sheep was improved.
(ii) Transgenic animals are created through biotechnology. Medicines are made from milk, blood and urine of transgenic animals.
(iii) Deficiency of lactoferrin enzyme causes mastitis in cow’s udder and reduced milk production. Transgenic bulls are created by injecting lactoferrin into bulls. The progeny of these transgenic bulls are resistant to mastitis.
(iv) Genes for human growth hormone have been introduced into sheep to produce more growth-prone sheep.
(v) High-growth fish have been developed by introducing marine fish genes into salmon, trout and pomace. The growth of salmon increased by 30 times.
(vi) Increased milk production by administration of bovine somatotropin to cows.