Role of ovarian steroids in the control of moult induction in laying fowls

Herremans, Marc; Decuypere, Eddy; Chiasson, Rb

doi:10.1080/00071668808417034

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…There was also a quicker response of the body plumage (compare the increases from day 0 to day 20 in Figs 2, 3 and 6), which can not fully be explained by the moulting of primaries being strictly sequential and moulting of contour-feathers more general. However, hens do lose considerable numbers of body-feathers in the course of a laying year without replacing them (Payne, 1972), apparently inhibited by high progesterone concentrations related to frequent egg laying (Herremans et al, 1988). It is reasonable to suppose that these 'empty follicles' have a different level of sensitivity to the activation of feather-growth than follicles which still bear an old feather.…”

Section: Methodsmentioning

confidence: 97%

Age and strain differences in plumage renewal during natural and induced moulting in hybrid hens

Herremans

1988

British Poultry Science

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1. Replacement of remiges and body-feathers was studied in several flocks of brown and white layers and broiler-breeders under near commercial conditions. 2. Spontaneous moulting of primaries was not circannual in modern laying hybrids; moulting response was more retarded in brown than in white hens. 3. Following induction of moulting by a standard procedure in brown hens, the extent of replacement of remiges increased with increasing age, but even at 81 weeks of age, moult was not completed, but ceased when half of the flock had moulted less than half of the primaries. 4. At comparable age the moulting response was considerably more extensive in broiler-breeders than in layers; moulting was not enhanced in hens that had already started to moult before the induction. 5. Compared to the remiges, the moulting response of the body-feathers was more complete and quicker. However, these results might be influenced by a lower threshold of sensitivity to feather growth-induction of the empty follicles, the cumulative number of which is considerable among the contour-feathers after several months of laying.

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Section: Methodsmentioning

confidence: 97%

Age and strain differences in plumage renewal during natural and induced moulting in hybrid hens

Herremans

1988

British Poultry Science

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“…The role of the thyroid gland in the development of long day refractoriness (Dawson, 1984;Nicholls et al, 1984) and in the periodic replacement of plumage in birds (see Payne, 1972, for (Payne, 1972 (Dittami and Hall, 1983) and in laying hens (Herremans et al, 1988;1989 (Payne, 1972) (1988,1989). The lowest T 4 levels were found in ganders during the regrowth of primaries (stages 3-7), when plasma T 3 levels were increased.…”

Section: Introductionmentioning

confidence: 99%

Changes in plasma testosterone, thyroxine and triiodothyronine in relation to sperm production and remex moult in domestic ganders

Zeman¹,

Kosutzký²,

Micek³

et al. 1990

Reprod. Nutr. Dévelop.

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Summary ― Changes in plasma testosterone (T), thyroxine (T 4 ), triiodothyronine (T 3 ), semen output and remex moult were studied in domestic ganders. A bimodal pattern in both plasma T and sperm concentration was observed during the annual cycle. Ganders started to produce semen at the end of January; maximum semen volume (0.32 ± 0.04 ml) and sperm concentration (148 ± 38 x 10 3 /mm 3 ) were reached in March and a marked decrease was observed after mid-April, when the moult of the remiges began. Plasma T 3 levels peaked in February (9.7 ± 0.6 nmol·I-! ) and this peak coincided with maximum T concentrations (9.8-10.4 nmoi'i!). ). Elevated levels of T 4 were found from late February until mid-April (31.0-33.6 nmol·I-!). Plasma T concentration was low at all stages of remex moult and regrowth. Decreased T 4 levels were found in ganders during remex regrowth from the &dquo;brush&dquo; to half of the full primary growth stage. Higher plasma T 4 levels were found before and after this stage of the moult. A reverse pattern was observed for T 3 concentrations.testosterone / thyroxine / sperm concentration / semen volume / moult / gander Résumé ― Testostérone, thyroxine et triiodothyronine plasmatiques en relation avec la production spermatique et la mue chez le jars domestique. Les changements de concentration plasmatique de testostérone (T), de thyroxine (T 4 ) et de triiodothyronine (T! ainsi que la production de spermatozoïdes et la mue des rémiges ont été étudiés chez le jars domestique. La sécrétion de T et la concentration des éjaculats en spermatozoïdes présente un profil bimodal au cours de l'année. Les premiers spermatozoïdes sont observés à la fin du mois de janvier, leur production est maximale en mars (57 ± 17 x 10 6 /éjaculat) puis diminue en avril au moment où les rémiges commencent à tomber. La concentration de T 3 est maximale (9,7 ± 0,6 nmolll) en même temps que celle de T (9,8 ± 10,4 nmol/1). La concentration en T 4 augmente de la fin février à la mi-avril (31-34 nmoili). Les concentrations plasmatiques de T sont faibles pendant la mue des rémiges; celles de T 4 passent par un minimum aux stades 4-5 de la mue et présentent un profil inverse de celui des concentrations plasmatiques de T 3 .

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Effect of plumage renewal after induced moulting on subsequent laying efficiency and persistence

Herremans

Decuypere

Groote

1989

British Poultry Science

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1. Brown egg layers and dwarf broiler breeder females were force-moulted by different diets. The relationship between the extent of feather replacement and subsequent laying performance was studied. Some brown hens were subjected to metabolic experiments in order to compare post-moult heat production in relation to moulting success. 2. The extent of moulting had a clear effect on the post-moult heat production, and the differences were still present after 6 months in the second year of laying. 3. The extent of feather renewal during moulting showed high and very significant rank correlations with efficiency of food utilisation during the subsequent laying cycle. These correlations were generally higher than those of other features of the moulting procedure (body-weight-loss, minimum weight, duration of pause in laying). 4. The long-term energetic implications of the extent of moulting play an important role in subsequent performances and the persistence of lay during the following year is related to the extent of feather replacement.

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Role of ovarian steroids in the control of moult induction in laying fowls

Cited by 6 publications

References 27 publications

Age and strain differences in plumage renewal during natural and induced moulting in hybrid hens

Age and strain differences in plumage renewal during natural and induced moulting in hybrid hens

Changes in plasma testosterone, thyroxine and triiodothyronine in relation to sperm production and remex moult in domestic ganders

Effect of plumage renewal after induced moulting on subsequent laying efficiency and persistence

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