In the USA literally 99% of animals killed for humans is from factory farming

I have to correct this.

You are technically correct. However, if you raise cattle on a pasture and then take them to sale, those cows are then fed up and fattened in feed lot. Which are considered "factory farms".

So now, 99% of all beef being raised on a pasture is technically considered to have come from factory farming.

Cows are actually a lot less likely to come from factory farms than other animals

Yes. However that's because your "99% of animals killed for food" number is mostly chickens. There are maybe just over a billion cattle on the planet, if I remember the stats right. There are less sheep and pigs than cattle, I think the number for pigs is 800 million. Meanwhile there are nearly 20 billion chickens at any given time.

The vast majority of all total animal ag numbers are skewed by poultry population. If you want to drastically reduce numbers related to factory farms and animals killed for food, eat less KFC.

It's always interesting how certain technicalities and populations can skew data like that.

For instance, chickens require maybe a quarter of a pound of food per day. That's nothing compared to cattle, right? Well that's 5 billion pounds of food for 20 billion chickens per day. Take out poultry and the amount of feed needed to be grown for animals drops by 1.8 trillion pounds per year.

The funny thing is that they're a great source of nitrogen-rich fertilizer. And even if everyone had two backyard chickens, a hen and a rooster, eating bugs in a yard instead of grains in a cage, the poultry population would still be around 16 billion. But again, they'd be eating bugs, not farmed grains. And fertilizer the soil.