摘要：Commercial hens generally begin ƉĂƌƚƵƌŝƟŽn eggs at 16–21weeks archaic, although ƉƌŽĚƵcƟŽn bit by bit declines soon oncefrom concerning 25 weeks archaic. In 1999, the Union councilĚŝƌĞcƟǀĞ 1999/74/EC extrajudicial typical bĂƩĞƌLJ cages forƉĂƌƚƵƌŝƟŽn hens throughout the Union from January 1, 2012;they were extrajudicial antecedent in several countries incŽnũƵncƟŽn with European country. In response to those bans,development of example business ĮƩĞĚ out cage systems beganat intervals the ĞŝŐŚƟĞƐ͘.
