OVARIAN DEVELOPMENT AND OOSORPTION IN AUTOGENOUS FEMALES OF THE BLOWFLY,LUCILIA CUPRINA(WIED.)

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Abstract
Nearly 90% of nulliparous females of a laboratory selected autogenous strain of the sheep blowly, Lucilia cuprina, developed mature oocytes when fed only sucrose and water. The mean number of oocytes matured by those females which reached maturity was about 100. In the few females which did not reach maturity, ovarian development ceased early in vitellogenesis. Females had approximately 250 ovarioles, and when given ad libitum access to sheep liver, matured virtually all their primary oocytes. Flies given limited amounts of protein-rich material matured more oocytes than individuals given only sucrose and water; the apparent efficiency of conversion of ingested protein to ovary protein was of the order of 50%. In females fed only sucrose and water or limited amounts of protein-rich material, the reduction in the number of oocytes resulted from oosorption initiated early in vitellogenesis. Oosorption was initiated earlier in females fed only sucrose and water, which were destined to resorb of the order of 150 oocytes, than in females which resorbed about 65 oocytes after having consumed a limited amount of protein-rich material. Mating increased slightly both the proportion of females expressing autogeny and the number of oocytes matured.