What method is commonly used to administer growth promotants to cattle?

The method commonly used to administer growth promotants to cattle is by implanting them under the skin on the back of the ear. This method is effective because it allows for a slow release of the growth promotant directly into the animal's system over a period of time, resulting in enhanced growth rates and feed efficiency. The implantation site is chosen due to the ease of access, as well as the reduced risk of tissue damage or complications compared to other administration routes.

Implants are also designed to stay in place without causing significant distress to the animal, contributing to their popularity in beef production. This practice aligns with livestock management techniques aimed at improving productivity while ensuring animal welfare. Other methods like injections, mixing with drinking water, or administering through a nasal spray are not typically utilized for growth promotants in cattle, as they either do not provide the same prolonged effect, may be less efficient, or aren't practical for continuous dosage.