Composite: A uniform group of cattle created by selectively crossing two or more breeds for several generations and establishing a certain fixed percentage of each breed (such as the Santa Gertrudis that carries 5/8 Shorthorn genetics and 3/8 Brahmon, or the Brangus that carries 8/8 Angus genetics and 3/8 Brahman, or the Beefmaster that carries approximately 1/2 Brahman genetics and the other half a blend of Hereford and Shorthorn in roughly equal percentage), In essence a composite is a new "breed" designed to retain a certain amount of heterosis in future generations without crossbreeding
, and can thus be maintained as a "pure" breed without further infusions of other breeds.
Other teams report that they have re-created a type of Heliconius butterfly by crossbreeding
two related species in the lab (SN: 6/17/06, p.
KNP with Duroc increased slaughter and carcass weights as well as dressing percentage without any effect on the backfat thickness and carcass grade.
Even so, researchers have developed another clever technique to prevent transgenes from getting into weeds through crossbreeding
His favorite symbol for crossbreeding
is the banyan tree, whose roots surface in one place only to descend into the ground somewhere else.
You can maximize the hybrid vigor that comes from crossbreeding
by incorporating a third breed," explains Brown.
They compare such procedures to traditional crossbreeding
The Hokkaido association's one attempt at live crossbreeding
, in which it borrowed a guide dog from the Kansai association, was successful but the cost -- about 50,000 yen to transport the dog -- made the process too expensive to be feasible, the officials said.
is nothing new, it's been going on for centuries and most breeds of domestic cat and dog today are a result of crossbreeding
experiments in the past.
The Innovis Aberdale crossbreeding
programme features a secure contract for all producers.
of low producing zebu (Bos indicus) cattle with high profile exotic breeds (Bos taurus) is widely adopted to improve the milk productivity in developing countries.
Farmers, food processors and environmental groups alike say accidental crossbreeding
in Brazil is virtually inevitable.