Animal enclosures such as poultry houses generate high amounts of ammonia that adversely affect weight gain and mortality or the animals, particularly among young chicks. The collapsible crib contains a canopy section and a crib section that are utilized to provide a partially enclosed sleeping area for an infant. When the main game reaches a predetermined state, the parent gain apparatus downloads a subgame to a child game apparatus connected to the parent game apparatus. At least one low-sensitivity focus pattern in ascending order of the focus sensitivity from among the acquired dose sensitivity data of the sample patterns is selected, and at least one dose pattern selected in descending order of dose sensitivity from among the at least one low-sensitivity focus pattern is determined. The indicator of the channel response of the channel may also be used to determine an adjustment of a center frequency of the wideband signal. For low level of data masking selected by a user, numerical data entries are shuffled within groups and for high level of data masking selected by a user, numerical data entries are shuffled across groups.