A Comparison of Several Treatments on Terminating Broodiness in Broad Breasted Bronze Turkeys

Haller, R. W.; Cherms, F. L.

doi:10.3382/ps.0400155

Cited by 23 publications

(6 citation statements)

References 17 publications

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“…A sound program for the detection and removal of broody hens is, of course, most desirable. A reliable scheme for detecting broodiness such as that described by Haller and Cherms (1961), should be used in order to avoid the inadvertent removal of laying hens from the flock.…”

Section: Discussionmentioning

confidence: 99%

The Egg-Laying Rhythm of Turkeys in Cages

1963

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Section: Discussionmentioning

confidence: 99%

The Egg-Laying Rhythm of Turkeys in Cages

1963

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“…They were provided with nest boxes, but were not allowed to incubate eggs. Broodiness was identified by cessation of lay, repeated entrance into and reluctance to leave the nest, and by ruffled feathers, aggressiveness and characteristic crowing calls (Haller & Cherms, 1961;Shafir, 1977). Birds were defined as broody when these criteria were exhibited on 6 consecutive days.…”

Section: Methodsmentioning

confidence: 99%

Concentrations of Pituitary, Gonadal and Adrenal Hormones in Serum of Laying and Broody White Rock Hens (Gallus Domesticus)

Bedrak¹,

Harvey²,

Chadwick³

1981

Journal of Endocrinology

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Diurnal variations in circulating concentrations of LH, GH, prolactin, corticosterone, oestradiol, progesterone and testosterone were followed in laying and broody White Rock domestic fowl. Throughout the 24 h study prolactin concentrations in serum were consistently (two- to fourfold) higher in broody than in laying birds, in which the prolactin level varied with the light:darkness or ovulatory cycles. Concentrations of GH in serum tended to be lower in broody birds but in both groups were very variable and showed no obvious relationship with either the lighting or ovulatory cycles. Broodiness was also characterized by low LH and gonadal steroid levels and by the absence of preovulatory peaks in the serum concentrations of these hormones. A diurnal rhythm in corticosterone was observed in both the laying and broody birds, with high levels during the period of darkness. Corticosterone concentrations were markedly higher in the broody birds than in laying birds during most of the 24 h study. No diurnal rhythm in the blood haematocrit level was observed in either group, although the level was generally lower in broody birds. This difference, however, was insufficient to account for the lower LH and gonadal steroid levels in the broody birds. The results suggest that prolactin is involved in the initiation or maintenance of broodiness in the fowl and the possibility of an antigonadal role for the hormone is discussed.

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“…Drop-door nest boxes were used. Birds which were found in the nest boxes, in the absence of eggs, before 07.00 and after 17.00 h for 2 consecutive days were identified as being 'pre-broody' hens (Haller & Cherms, 1961;Shafir, 1977) and were isolated from the laying birds. Broody birds were similarly isolated from the laying hens and were recognized by their repeated entrance into and reluctance to leave the nests, their aggressive behaviour, ruffled feathers and characteristic crowing call.…”

Section: Methodsmentioning

confidence: 99%

“…Although the broody trait has been partly removed from species of commercial birds by constant genetic selection, its incidence in domestic turkeys may reach 40% (Cherms & Stoller, 1974). The early identification of hens which will become broody and the development of treatments to terminate the phenomenon are, therefore, of considerable economic importance (Haller & Cherms, 1961;Nestor, Bacon & Renner, 1971;Shafir, 1977). Elucidation of the endocrine control of broodiness is therefore essential for the development of therapeutic techniques for the prevention of broodiness in commercial breeding flocks.…”

Section: Introductionmentioning

confidence: 99%

Serum Concentrations of Prolactin, Luteinizing Hormone, Growth Hormone, Corticosterone, Progesterone, Testosterone and Oestradiol in Relation to Broodiness in Domestic Turkeys (Meleagris Gallopavo)

Harvey¹,

Bedrak²,

Chadwick³

1981

Journal of Endocrinology

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Variations in concentrations of LH, GH, prolactin, corticosterone, oestradiol, testosterone and progesterone in serum were followed over a 24 h period (14 h light:10 h darkness) in laying and broody turkeys and in turkeys suspected of becoming broody (pre-broody hens). In laying hens marked variations in LH and gonadal steroid levels were observed in relation to the ovulatory cycle of the bird. These patterns of hormone secretion were not seen in either group of broody birds. Levels of GH in serum were very variable and showed no correlation with the egg-laying or light:darkness cycle and the concentrations did not differ between the respective physiological states. A nocturnal increase in the concentration of corticosterone in serum was observed in all three groups of turkeys and the concentration was occasionally higher in the pre-broody and broody birds than in the laying hens. The serum prolactin concentration in each group was also very variable and showed no obvious relationship with the ovulatory or photoperiodic cycle. The mean circulating prolactin concentration throughout the 24 h period did not differ significantly between the groups. These results suggest that broodiness in the domestic turkey is not initiated or maintained by enhanced prolactin secretion.

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A Comparison of Several Treatments on Terminating Broodiness in Broad Breasted Bronze Turkeys

Cited by 23 publications

References 17 publications

The Egg-Laying Rhythm of Turkeys in Cages

The Egg-Laying Rhythm of Turkeys in Cages

Concentrations of Pituitary, Gonadal and Adrenal Hormones in Serum of Laying and Broody White Rock Hens (Gallus Domesticus)

Serum Concentrations of Prolactin, Luteinizing Hormone, Growth Hormone, Corticosterone, Progesterone, Testosterone and Oestradiol in Relation to Broodiness in Domestic Turkeys (Meleagris Gallopavo)

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