Abstract
SUMMARY Five characteristics of cervical mucus were investigated to determine if abnormalities might be responsible for the lowered fertility observed in cattle following progestagen administration. Mucus from animals fed 1 mg of melengestrol acetate (MGA) daily for 3 and 14 days did not differ significantly from that of controls in quantity, crystallization patterns or alkaline phosphatase content. However, on the last day of MGA feeding (day 14) treated animals had thicker mucus (P Based on quantity, consistency and alkaline phosphatase content of mucus from treated animals on day 4 after MGA withdrawal and from control animals on the day of oestrus, there appears to be no reason to indict cervical mucus as the cause of lowered fertility in MGA-treated animals. However, the altered crystallization patterns and sperm migration might indicate changes of significance in relation to feritlity.
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