Marius was due to be killed by a bolt gun, not a lethal
injection, which would contaminate the meat.
A bid to save a young giraffe from destruction at Copenhagen Zoo has failed, and the giraffe was put down on Sunday morning.
Thousands of people had signed an online petitions appealing for a change of heart over the 18-month-old called Marius.
The zoo said it had no choice because of European rules to avoid in-breeding.
Marius was due to be killed by a bolt gun, not a lethal injection, which would contaminate the meat.
The UK's Yorkshire Wildlife Park - which has a state-of-the-art giraffe house and the capacity for an extra male - was among two zoos which reportedly put in a last-ditch offers to take Marius in.
On Saturday Bengt Holst, scientific director at the Danish zoo, defended Marius's destruction, saying his genes were already well represented among giraffes at the zoo.
The zoo insists the giraffe population must be kept
He told the BBC it was a responsible practice on the part of zoos to manage their animal populations to ensure they remained healthy.
He could not understand the fuss over Marius, pointing out that, for instance, 700-800 deer are killed every year at a deer park north of Copenhagen to control their numbers.
The zoo planned to dissect the animal after it was killed, before feeding it to the tigers and other carnivores.
"It would be absolutely foolish to throw away a few hundred kilos of meat," Mr Holst said according to the Swedish newspaper Svenska Dagbladet. "Some is used for research and the rest for food."
Animal rights campaigners have described the move as barbaric and have accused the zoo of being unethical.