Why has become such a huge as 'a cow refused to slaughter' because it is too big?

It is talked about as a huge cattle "Nickers" with a body height of 194 cm and a weight of 1.4 tons being raised in Australia. Why did the Nickers survive as "It's too big to process meat" so huge? A biologist at Washington State University answers the question.

How Did That Big Cow Get So Huge?
https://www.livescience.com/64187-big-cow-steer.html

Big Knickers a standout on Myalup farm | PerthNow
https://www.perthnow.com.au/business/agriculture/big-knickers-a-standout-on-myalup-farm-ng-b881032899z

Knickers the cow: why Australia's giant steer is so fascinating | World news | The Guardian
https://www.theguardian.com/world/2018/nov/28/knickers-the-cow-why-australias-giant-steer-is-so-fascinating

No sale for Australia's enormous Knickers (who is male, by the way) - BBC News
https://www.bbc.com/news/world-australia-46357449

The knickers are huge from other cattle and their height is almost the same as Michael Jordan of former basketball player. Although it was issued to the auction in October 2018, it was said as "a biggest cattle in Australia", but from a meat processor, it was declined as "It is too big to handle with meat processing machine". Nickers are too heavy to put on machinery for meat processing, so it is necessary to work on the floor to process it as meat but doing so will eventually forget to work because there is a problem of contamination. I was concluded that I could not get it.

You can understand the enormity of the Nickers with a single shot when you see the following movie.

Meet Knickers, the 1,400 kg cow from Australia - YouTube


While cattle of the same size are swarming ... ...

It is Nickers that protrudes only one head.

It is about the size to overlook the other cows.

Nikkazu will slowly walk forward with the cow of running cow.

It is like this when compared with adult men.

Pearson, farmer, said that the cattle raised with the Nickers was going to go to the slaughterhouse early, but the Nickers will continue to stay on the farm in the future.

But why did the Nickers become so huge? Pearson also does not know the reason.

Professor Min Du who studies biology at Washington State University suggests the possibility of excessive secretion of growth hormone for this cause. Although Professor Du did not actually see the Nickers, he said that although there are various possibilities, "This type of mutation is likely to be caused by growth hormone or growth hormone receptor". Professor Du showed that growth hormone was excessively secreted around 2 to 3 years before becoming an adult.

However, although the Nickers are said to be the "biggest cattle in Australia", The Guardian explains that the world's largest cow is a cow called "Bellino" living in Italy. Berino is said to be 2 meters and 20 centimeters tall.