crossbreeding systems

Question 1

what is a terminal cross

Answer 1

crossbreeding design where all offspring are slaughtered (no replacements kept

Question 2

whats a 3 way terminal cross

Answer 2

3 sets of dna

Question 3

whats a 4 way terminal cross?

Answer 3

4 sets of DNA

Question 4

what are practical aspects of rotational crossing

Answer 4

need to keep good records
need to keep 20-30 replacements to justify a new bull
need 2 or more breeding pastures

Question 5

what is grading up

Answer 5

method of crossing used primarily in the beef industry to switch to a new breed
continual breeding of sires from new breed to females from previous generation
continental beed breeds
purebred 15/16 or hgiher

Question 6

what is a full blood

Answer 6

100% with no ancestors of another breed

Question 7

what is a straightbred

Answer 7

purebred but not registered

Question 8

what is synthetic production

Answer 8

crossbred of 2 or more breeds until new breed
new breed produced to improve hybrid vigour
after development, the herd can be managed as a purebred herd without further crossbreeding

Question 9

where does M1 come from

Answer 9

angus cross

Question 10

where does m2 come from

Answer 10

hereford breeding

Question 11

what is M4

Answer 11

breeding commercial cows with an angus, hereford or simmental base

Question 12

what is M3

Answer 12

bull is a smaller animal used for breeding heifers - background contains jersey, shorthorn and longhorn

Question 13

what is a katahdin

Answer 13

meat breed with hair sheep - no shearing
african hair sheep X tunis southdown suffolk and cheviots

Question 14

what is rideau arcott

Answer 14

finnish landrace suffolk and east friesian
large litter meat and milk

Question 15

what is a crossbreed sire

Answer 15

crossbred bores and rooster are developed from lines and are conisstne
beef industry doesnt have these established lines yet