and had free access to feed and water. The house was automatically ventilated to maintain an ambient tempera- ture between 20 and 28°C, with a photoperiod of 16 h light/d at 15 lx. These conditions induced some hens to exhibit broodiness, and 3 to 5 eggs were allowed to remain in each nest to promote the broody condition. The 4 wk after transferring to the windowless house was regarded as a transition period, and broody traits were not recorded during this period.
White Leghorns (n = 72), a maternal line of Hy-Line brown egg layers (n = 93), a maternal line of Avian broiler breeders (n = 20), and Chinese local breeds including Shou-guang (71), Beijing-you (n = 48), and Silkie (n = 222) were screened for allelic frequencies of the PRL gene. These breeds or lines, excluding Shou-guang and Beijing- you, were also screened for allelic frequencies of the PRLR gene. The White Leghorns have a long history of selection against broodiness, whereas this behavior is still common in Chinese local breeds.
and had free access to feed and water. The house was automatically ventilated to maintain an ambient tempera- ture between 20 and 28°C, with a photoperiod of 16 h light/d at 15 lx. These conditions induced some hens to exhibit broodiness, and 3 to 5 eggs were allowed to remain in each nest to promote the broody condition. The 4 wk after transferring to the windowless house was regarded as a transition period, and broody traits were not recorded during this period.White Leghorns (n = 72), a maternal line of Hy-Line brown egg layers (n = 93), a maternal line of Avian broiler breeders (n = 20), and Chinese local breeds including Shou-guang (71), Beijing-you (n = 48), and Silkie (n = 222) were screened for allelic frequencies of the PRL gene. These breeds or lines, excluding Shou-guang and Beijing- you, were also screened for allelic frequencies of the PRLR gene. The White Leghorns have a long history of selection against broodiness, whereas this behavior is still common in Chinese local breeds.
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