Quite a range of things. It's so many It's hard to list them all. Some of these are more global than others:

Eyestalk ablation is the removal of one (unilateral) or both (bilateral) eyestalks from a crustacean. It is routinely practiced on female shrimps (or female prawns) in almost every marine shrimp maturation or reproduction facility in the world, both research and commercial.

https://en.wikipedia.org/wiki/Eyestalk_ablation

Chick culling or unwanted chick killing is the process of separating and killing unwanted (male and unhealthy female) chicks for which the intensive animal farming industry has no use. It occurs in all industrialised egg production, whether free range, organic, or battery cage.

https://en.wikipedia.org/wiki/Chick_culling

A gestation crate, also known as a sow stall, is a metal enclosure in which a farmed sow used for breeding may be kept during pregnancy.[1][2][3] A standard crate measures 6.6 ft x 2.0 ft (2 m x 60 cm).[4][5]

[...]

There were 5.36 million breeding sows in the United States as of 2016, out of a total of 50.1 million pigs.[8] Most pregnant sows in the US are kept in gestation crates.

https://en.wikipedia.org/wiki/Gestation_crate

Ventilation shutdown (VSD) is a means to kill livestock by suffocation and heat stroke in which airways to the building in which the livestock are kept are cut off. It is used for mass killing — usually to prevent the spread of diseases such as avian influenza. Animal rights organizations have called the practice unethical.

https://en.wikipedia.org/wiki/Ventilation_shutdown

Something like feeding bird poop to cattle

https://www.latimes.com/environment/story/2024-04-18/avian-flu-outbreak-raises-a-disturbing-question-is-our-food-system-built-on-poop#:~:text=%E2%80%9CPoultry%20litter%20should%20not%20be,Union%20%E2%80%94%20have%20banned%20the%20practice.