Abstract
The possibility of prediction of dairy performance in virgin goats by means of the induced lactation by the injection with the synthetic estrogen was studied by examining the relation between induced lactation and normal lactation. Sixteen virgin goatlings adopted randomly were injected subcutaneously with 0.25mg. diethylstilbestrol ("Euvestin")in oil once daily for 20 days in spring, aird the induced lactation was examined. Then, the nornal lactation following to pregnancy and parturition in the next year was also examined. Further, the relation of dairy characters between these two lactations vyas investigated. The examined dairy characters were as such, maximum daily yield (in average 5 of days), maximum period, duration of lactation, total milk yield, average milk yield, coefficient of regression line at rapid increase and average butter fat percentage. To regret, the survived goats at the terminal of the ekamination fell to six by the disasterous death and accidents, so the obtained figures were examined on the significance in scarce cases. Further, the comparison of mammary gland between these two lactations at the height of milk secretion was carried out histologically by removing the small block of the giand. Results obtained here are briefly summarized as follows.
