Testicular Growth and Comb and Wattles Development in Three Italian Chicken Genotypes Reared Under Free-Range Conditions

Rizzi, C.; Verdiglione, Rina

doi:10.4081/ijas.2015.3653

Cited by 9 publications

(15 citation statements)

References 39 publications

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“…The result can be important: if the comb is an important characters for choosing partners during the reproductive phase, as stated by Zuck et al (1992), and head appendages can be a signal for reproductive quality (Rizzi and Verdiglione 2015), the presence of a more evident comb in those genotypes with a reduced development of the comb due to their peculiar skull anatomy, may be considered in a genetic selection activity.…”

Section: Resultsmentioning

confidence: 99%

A morphometrical study on the skull of Padovana chicken

Verdiglione

Rizzi

2017

Italian Journal of Animal Science

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A trial was carried out to study the head and skull characteristics in a crested chicken breed with cerebral hernia located in a frontal bony protuberance, an uncrested chicken hybrid strain and their relative crosses. Males and females from five genotypes were used: two Padovana breed varieties (two colour plumages: Padovana argentata, silver -PA- and Padovana camosciata, chamois -PC-), the relative cross (PCxPA), a commercial single comb medium-growing strain (Berlanda gaina - B) and the cross between PC and B (PCxB). As regards skull dimensions B showed heavier, longer, and wider skull than Padovana group (P<0.001); the cross PCxB had skulls heavier than Padovana purebreds (P<0.05). In the Padovana purebreds the frontal bone height varied from 9.2 to 16.2 mm, whereas in the groups with B component the height ranged from 4.2 to 6.8 mm. The frontal bone height was higher in PC and PCxPA than in PA (P<0.01), whereas B and PCxB did not show any bony protuberance. No correlation resulted in Padovana groups between the frontal bone height and the skull length and width. A positive relationship between frontal bone height and skull height was significant only in PCxPA. For the skull characters of PCxPA both the two genotypes seems to be involved and no predominant and relevant effect of only one genotype was seen. The PCxB cross showed relevant differences in the skull morphometry, particularly in the absence of frontal bony protuberance and in the presence of comb

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Section: Resultsmentioning

confidence: 99%

A morphometrical study on the skull of Padovana chicken

Verdiglione

Rizzi

2017

Italian Journal of Animal Science

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“…Exogenous testosterone can stimulate wattle growth quickly [9]. Following the opinion of Rizzi and Verdiglione [10], the size of wattle is positively correlated with testosterone levels. This is probably caused by the difference growth time between wattle height compared to wattle length which requires a longer time, so the effect has not been detected yet.…”

Section: Effect Of Nab Treatment On Wattle Sizementioning

confidence: 86%

The Effect of Natural Aromatase Blockers on the Testicle Weight, Size of Wattle and Histopathological of Testis In Bangkok

et al. 2021

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The aromatase enzyme is an enzyme that converts testosterone to estrogen. This means that by administering aromatase blockers, testosterone levels increase and estrogen levels decrease. The problem faced is how the spermatogenesis process occurs because estrogen is needed as well in the process. This study aimed to evaluate the histopathological features of the testes due to the administration of natural aromatase blockers (NAB). Fifteen male Bangkok chickens were divided into 5 groups, namely: control group (C); testosterone continues (Tc 0.4 mg/bird/day); natural aromatase blockers 33 (NAB 3.3 g/bird); natural aromatase blockers 66 (NAB 6.6 g/bird); zinc (Zn): 0.45 mg/kg body weight (BW). The oral treatment was given for 35 days. The results showed that NAB did not affect wattle growth, but significantly affected testicle weight (p-value < 0.05). The NAB 66 group had the heaviest testis weight, followed by zinc, continuous testosterone, NAB 33 group, and the control group. This results was confirmed by HE staining on the testes which showed the thickness of the thickest spermatogenic and spermatid cell layers in the NAB 66 group. It was concluded that giving NAB did not harm the spermatogenesis process.

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“…As testosterone determines comb size, the testicular size also affects the ornamental organs. For example, Italian roosters show a correlation between testicular and comb size [22]. Testicular size affects the sexual phenotypes of birds because of testosterone production.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Zinc, Shell, and Fishbone Supplementations on Comb Width and Length of Bangkok Rooster

et al. 2022

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The Bangkok rooster is a prestigious ornamental bird in Indonesia. Zinc and shell have an aromatase blocker effect that results in testosterone elevations. Additionally, fishbone contains rich protein for optimum biological functions. Serum testosterone regulates comb size in the chicken. This study aimed to investigate the effect of natural aromatase blockers and protein in the comb of Bangkok roosters. This experiment divided thirteen Bangkok roosters into control and treatment groups with zinc, fishbone-shell, and fishbone supplementations. The weekly comb lengthening and widening were intervals between week 0 and the measurement week in this study. The results suggested that fishbone and fishbone-shell supplementations escalated the comb lengthening. Fishbone–shell treatment significantly increased the comb lengthening in the second and fourth weeks (p < 0.05). The significant elongation change in the fishbone group only appeared in the second week (p < 0.05). Otherwise, the treatments produced lower comb widening in the roosters. Fishbone and fishbone-shell supplementation significantly caused a lower widening in every measurement week (p < 0.05). This study uncovered the effects of zinc, shell, and fishbone supplementations on reproductive phenotype in Bangkok roosters.

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Testicular Growth and Comb and Wattles Development in Three Italian Chicken Genotypes Reared Under Free-Range Conditions

Cited by 9 publications

References 39 publications

A morphometrical study on the skull of Padovana chicken

A morphometrical study on the skull of Padovana chicken

The Effect of Natural Aromatase Blockers on the Testicle Weight, Size of Wattle and Histopathological of Testis In Bangkok

The Effect of Zinc, Shell, and Fishbone Supplementations on Comb Width and Length of Bangkok Rooster

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