Abstract
A study was planned on the effect of contraceptive steroids on milk yield and composition in goats after established lactation. The goats were classified into six groups: Group I received no medication and was considered as a control group. Group II was given Deladroxate injections. Groups III and IV received Lyndiol 2.5 and Lyndiol 1.0, respectively. Group V received lynestrenol 0.5 mg. alone and Group VI, mestranol 0.1 mg. alone. The milk yield per 24 hours was found to decrease in all groups, the drop amounting to 42 per cent in the control group, 71.6 per cent in Group II, 60 per cent in Group III, 52 per cent in Group IV, 55.6 per cent in Group V, and 56 per cent in Group VI. The growth rate of the kids in Groups II, III, and IV was lower than that in the control group. The milk fat and proteins dropped gradually. This was most marked in medicated groups. Milk lactose showed minor variations, while the changes in the inorganic constitutents were inconsistent, varying between increment and decrement. These results confirm the previous findings in women, that gestagens exert an adverse effect on the quantity and quality of milk when they are orally or parenterally administered during lactation.
Published Version
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