In insects, extra-molting has been viewed as a compensatory mechanism for nymphal growth that contributes to optimize body weight for successful reproduction. However, little is known on the capacity of extra-molting to evolve in natural populations, which limits our understanding of how selection acts on nymphal growth. We used a multi-generational pedigree, individual monitoring and quantitat...

In recent papers, Tanabe et al.(1956,1957) reported that no increase in the uptake of I131 by the thyroid was observed in molting hens as compared with laying hens,and no acceleration in the release of I131 as thyroid hormone from the thyroid of the hen was observed either in molting period or in pre-molting period. Further-more, it has been shown that thiouracil feeding does not prevent natura...

1. Larval-specific protein, LSP, reaches a peak concentration in cockroach hemolymph 2448 hr prior to ecdysis. 2. When ecdysis is delayed by autotomy-induced leg regeneration, LSP continues to accumulate and reaches a higher than normal peak concentration 28 hr prior to the delayed ecdysis. 3. Ecdysone inhibits the regeneration-induced delay and returns the normal pattern of ecdysis and LSP acc...

Soft-shell crabs are famous in seafood restaurants because they have a wonderful flavor, easy to eat, and highly nutritious! any regular edible crabs, but their natural, soft-shell condition—because just shed old shells, an event called molting. Within few hours after molting, while still condition, these harvested sold as crabs. Crabs the condition higher market value than hard-shell condition...

Molting is a natural physiological phenomenon involving the periodic replacement of old feathers with new ones in the avian species. During mid-November an extensive loss of feathers in Japanese quail was observed in our breeding colony. The cause of molting could not be established, however, lower ambient temperatures may have played a major role and the decrease in day length could not be rul...

481 fresh fertilized eggs of three Kurdish local chickens (Black with brown neck, White with shank feathering, and White with non-feathering shank) were collected at pre-molting (355 eggs) and post-molting (126 eggs) stages to evaluate external egg traits. A venine caliper was used to determine the length and breadth of eggs to calculate Shape index. Results indicated that egg weight increased ...

The aims of this study were to obtain information on the mechanism of molting and the prolactin hormone levels affecting egg production. The study utilized AP (crossbred of Alabio ♂ with Peking ♀) and PA (crossbred of Peking ♂ and Alabio ♀ ducks) with a total of 180 birds. The observed variables were the duration of cessation of egg production before and after molting, the prolactin hormone lev...

Juvenile noble crayfish, Astacusastacus (Crustacea, Astacidea) in the second year of age were kept in the laboratory for a twelve-month period under continuing "summer conditions" (LD 16:8, 19°C). Molting processes in this population could be synchronized by artificial moonlight cycles. Peaks of exuviations occurred at "new moons". Males showed a slightly higher degree of synchronization than f...

1. The amount of regenerating limb tissue does not control the length of molting delay in cockroaches; rather, a programmed delay associated with each autotomy level and segment allows an appropriate delay for accomplishing the necessary regeneration. 2. Delay of molting is accomplished by inhibiting ecdysiotropin release. 3. Each regenerating limb produces a delay independent of other regenera...

The molting cycle of insects has long been used as a model system for studying development. Studies on hormonal control mechanisms (Wyatt, 1972; Doane, 1973; Willis, 1974), pattern formation (Locke, 1967; Lawrence, 1973) and neuronal development (Edwards, 1969) have effectively used the molting and metamorphic cycles of insects to add to our understanding of development. Two insect species whic...