Inspection is not required prior to slaughter by licensed slaughterers at slaughterhouses where the chief determines it is impossible or impractical to have inspection prior to slaughter. The chief shall, from time to time, designate which slaughterhouses are within this category. Slaughterers at such slaughterhouses shall keep the records which are required by Section 22045. They shall also keep the hides of animals which are so slaughtered until the hides are inspected or released.