Certain factors must be considered when selecting birds for breeding: List five of these factors.

Here are five factors to consider when selecting birds for breeding:

1. Health and Vigor: Select birds that are free from disease, active, and show no signs of physical abnormalities or stress.
2. Age: Choose birds that are at an optimal breeding age, as very young or very old birds may have reduced fertility or productivity.
3. Temperament: Select birds with a calm and non-aggressive disposition, as this can influence breeding success and the behavior of offspring.
4. Physical Characteristics: Consider desirable traits such as appropriate size, good feather quality, strong legs, and overall conformation specific to the breed.
5. Productivity/Performance: Evaluate past performance, such as egg-laying ability, fertility rates, hatchability, and growth rate of offspring, if known.