Topic 43

Question 1

Reasons for breed endangerments

Answer 1

human civilization and culture; natural phenomenon during evolution; cosmic relations (dinosaurs); Dodo made extinct due to human factors (hunting; without enemies, they were friendly and shy); extreme international distribution of some breeds; 30% of mammalian and bird breeds are critically endangered

Question 2

Grades and status

Answer 2

Extinct; critical breed; endangered breed; critical maintained/endangered maintained; breed at risk; breed not at risk

Question 3

Extinct

Answer 3

no longer possible to recreate the population. No oocyte or semen to create embryo

Question 4

Critical breed

Answer 4

total number of breeding females is less than 100 or number of breeding males less than 5. Overall population around 100 but decreasing

Question 5

Endangered breed

Answer 5

total number of breeding females between is between 100 and 1000; total number of breeding males is less than 20; population around 1000 but decreasing

Question 6

Critical maintained breed and endangered maintained breed

Answer 6

breeds that are being maintained by active public conservation program

Question 7

Breed at risk

Answer 7

a breed that has not been classified as critical, critical maintained, endangered

Question 8

Breed not at risk

Answer 8

number of breeding females greater than 1000; males greater than 20; pop size increasing