Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 PSOROPTIC MANGE—SHEEP SCAB. 617 when the mites are two-thirds the size of the adults ; when seven to eight days old the mites are mature and ready to pair ; sevei'al (three or four) days are allowed for pairing; another generation of eggs may be laid fourteen to fifteen days after the laying of the first gene- ration of eggs. Without going into all of the other observations on

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