Substances containing mercury would be classified as

Toxic waste

Explanation:

Toxic waste are chemical substances which are poisonous, can cause cancer, can cause birth defects and may lead death or severe ailment. Toxic waste can lead to poisoning occurs when ingested, inhaled, or absorbed by the skin.

Examples of toxic wastes are Lead-Acid Battery, Mercury (mercury pollution), Pesticides Pollution, Arsenic in Ground Water etc.

Mercury vapors can cause neurological and behavioral disorders like tremors, emotional instability, insomnia, memory loss and so on.

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common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.