The influence of oocyte resorption on ovarian development rates in the Australian sheep blowfly, Lucilia cuprina

1985 ◽  
Vol 39 (1) ◽  
pp. 85-90 ◽  
Author(s):  
W. G. Vogt ◽  
T. L. Woodburn ◽  
A. C. M. Gerwen
Keyword(s):  
Ovarian Development ◽  
Lucilia Cuprina ◽  
Development Rates ◽  
Australian Sheep ◽  
Oocyte Resorption

Ovarian development in females of the Australian sheep blowfly Lucilia cuprina (Diptera: Calliphoridae) fed on sheep faeces and the effect of ivermectin residues

1991 ◽  
Vol 81 (3) ◽  
pp. 249-256 ◽  
Author(s):  
David F. Cook
Keyword(s):  
Control Strategy ◽  
Ovarian Development ◽  
Lucilia Cuprina ◽  
Ivermectin Treatment ◽  
Feeding Frequency ◽  
Continuous Access ◽  
Australian Sheep ◽  
Continuous Feeding ◽  
The Cost

AbstractThis study demonstrates that only a proportion of Lucilia cuprina (Wiedemann) females, which have fed exclusively on sheep dung collected from spring improved pastures, are able to mature a complement of oocytes at the cost of high resorption. Fifty percent of females developed mature oocytes after 11 d of continuous feeding on sheep dung. After 14 d feeding, 80% of females had matured an average of 143 eggs. Females given ad lib access to sheep's liver developed mature oocytes within 2–3 d feeding, producing an average of 223 eggs. Results show that sheep dung is a resource used by L. cuprina adults, but by itself appears to be a poor source of protein for field females to mature oocytes. Females given continuous access to dung collected from sheep 18 h after being drenched with ivermectin, were virtually unable to develop oocytes beyond the resting stage after 10 d feeding. Female adults in particular, became distended with fluid over successive days feeding and both sexes suffered significantly higher mortality compared with adults fed on untreated sheep dung. Knowledge on the feeding frequency and amounts of sheep dung ingested by L. cuprina adults may enable an assessment of the potential for manipulation of ivermectin treatment in a control strategy.

Relationship between mated status of females and their stage of ovarian development in field populations of the australian sheep blowfly, lucilia cuprina(wiedemann) (diptera: calliphoridae)

1987 ◽  
Vol 77 (4) ◽  
pp. 609-615 ◽  
Author(s):  
L. Barton Browne ◽  
A. C. M. Van Gerwen ◽  
P. H. Smith
Keyword(s):  
Sex Ratio ◽  
Ovarian Development ◽  
Operational Sex Ratio ◽  
Lucilia Cuprina ◽  
Sexually Active ◽  
Australian Sheep ◽  
Rich Material ◽  
Protein Rich ◽  
The Relationship

AbstractIn field populations of Lucilia cuprina (Wiedemann) in Australia, there was a very low percentage of mating in females that, on the evidence of their stage of ovarian development, had not yet consumed protein-rich material. Virtually all females whose oocytes had reached early vitellogenesis had mated. Thus, most females of this anautogenous species had mated soon after their ovarian development had proceeded beyond the resting stage at which development ceases in females that have not consumed protein. The relationship between mated status and ovarian development of hand-caught females did not differ from that for females which had been allowed to remain for more than 1 h with sexually active males in the collection chamber of traps. Thus mating occurred rarely, if at all, in the trap chambers, which suggests that females in the field mate soon after first becoming sexually receptive. This, together with knowledge that females of this species do not remate readily, indicates that the operational sex ratio in L. cuprina is heavily male-biased.

Oöcyte resorption during ovarian development in the blowfly Lucilia cuprina

1979 ◽  
Vol 25 (2) ◽  
pp. 147-153 ◽  
Author(s):  
L. Barton Browne ◽  
A.C.M. van Gerwen ◽  
Keith L. Williams
Keyword(s):  
Ovarian Development ◽  
Lucilia Cuprina ◽  
Oocyte Resorption

Oogenesis in Lucilia Cuprina (Wied.) (Diptera: Calliphoridae). Ii. The Effect of Aziridinyl Chemosterilants on Oogenesis.

1979 ◽  
Vol 27 (3) ◽  
pp. 349 ◽  
Author(s):  
GAC Beattie
Keyword(s):  
Direct Effect ◽  
Nurse Cell ◽  
Ovarian Development ◽  
Fat Body ◽  
Endocrine System ◽  
Lucilia Cuprina ◽  
Follicle Cells ◽  
Cell Nuclei

Inhibition of ovarian development in L. cuprina by two aziridinyl chemosterilants, N,N'-hexamethylenebis(1-aziridinecarboxamide) and N. N'bisaziridinyl-N"-cyclohexylphosphine sulphide, was due to the direct effect of the sterilants on the ovary. The sterilants caused infecundity by interfering with mitosis in the follicle cells. Contrary to the accepted view, no evidence was obtained to suggest that infecundity resulted from inhibition of endomitosis in the nurse cell nuclei. Neither sterilant prevented the digestion of protein by the midgut, nor did they prevent the endocrine system and fat body from functioning.

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