DNA test targets lambs individual strengths

Sheep breeders will be able to DNA-test lambs at birth with a world-first procedure to show which animals will be the most valuable for farmers. AgResearch scientist John McEwan said the test would be available to commercial breeders in the next few months. It had taken more than $2 million to develop reports Stuff. Although some genetic testing of sheep was already done by commercial breeders, that testing gave breeders only predictions about a small number of character traits, Mr McEwan said. Current tests allowed breeders to predict a sheep's future muscle growth, but the new test would accurately show from birth everything from the sheep's future growth rate, to its resistance to disease. The test would also give a complete genetic picture of individual animals, allowing breeders to see every genetic variation and mutation in the sheep's genetic make-up. Sheep productivity had risen 70 per cent since 1990, and Mr McEwan hoped the test would allow for further improvements and for breeders to make better decisions about which animals to select for breeding. "I hope it can double the rate of genetic gain." A blood or tissue sample is taken from a lamb at birth. Within a month, the test result shows the lamb's complete genetic makeup. Current tests show limited genetic information. The new test will show breeders which animals are genetically inclined to grow faster, be more resistant to disease, have more lambs, eat less feed and possibly produce less methane.