What is a requirement for the transport crate of live animals?

The requirement that the transport crate of live animals must have handholds for lifting is essential for ensuring both the safety of the animals and the handlers. Handholds facilitate secure grip points that allow for easier and safer lifting, reducing the risk of accidents or injuries during transport. This design consideration is important not only for the humane treatment of the animals being transported but also for the efficiency of handling by personnel.

The other options do not fulfill necessary requirements under the Animal Welfare Act regulations. For instance, while ensuring visibility is important, there is no stipulation demanding that crates be painted white. Similarly, while markings on the crate may be important for indicating proper handling, "Do Not Tilting" is not a standard requirement as crates must be designed to secure the animals without the need for such warnings. Finally, cleanliness is crucial in animal transport to prevent disease and ensure the well-being of the animals, making it unacceptable to use crates without cleaning them. Thus, the requirement for handholds is vital for safety and humane treatment in the transport of live animals.