A description of the growth and moulting of feathers in commercial broilers

Vargas, Larissa Braganholo; Sakomura, Nilva Kazue; Leme, Bruno Balbino; Antayhua, F A P; Campos, Daniel Mendes Borges; Gous, R. M.; Fisher, C.

doi:10.1080/00071668.2020.1747597

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…FM of chickens in our study was a biological process of rejuvenation through restriction of diet or fasting. After FM, laying hens regrew new feathers and became healthier than before, additionally, ELR of chickens generally recovered to the level of the first peak, and both egg quality and eggshell quality were improved [42]; even the gut microbiota was richer and improved feed efficiency [19]. Therefore, FM should delay the aging of laying hens and redevelop their tissues and organs, especially the brain and reproductive organs.…”

Section: Fasting Promotes the Health Of Both People And Animalsmentioning

confidence: 99%

Transcriptomic Analysis of Laying Hens Revealed the Role of Aging-Related Genes during Forced Molting

Zhang

Chen

Wen

et al. 2021

Genes

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Molting in birds provides us with an ideal genetic model for understanding aging and rejuvenation since birds present younger characteristics for reproduction and appearance after molting. Forced molting (FM) by fasting in chickens causes aging of their reproductive system and then promotes cell redevelopment by providing water and feed again. To reveal the genetic mechanism of rejuvenation, we detected blood hormone indexes and gene expression levels in the hypothalamus and ovary of hens from five different periods during FM. Three hormones were identified as participating in FM. Furthermore, the variation trends of gene expression levels in the hypothalamus and ovary at five different stages were found to be basically similar using transcriptome analysis. Among them, 45 genes were found to regulate cell aging during fasting stress and 12 genes were found to promote cell development during the recovery period in the hypothalamus. In addition, five hub genes (INO80D, HELZ, AGO4, ROCK2, and RFX7) were identified by WGCNA. FM can restart the reproductive function of aged hens by regulating expression levels of genes associated with aging and development. Our study not only enriches the theoretical basis of FM but also provides insights for the study of antiaging in humans and the conception mechanism in elderly women.

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Section: Fasting Promotes the Health Of Both People And Animalsmentioning

confidence: 99%

Transcriptomic Analysis of Laying Hens Revealed the Role of Aging-Related Genes during Forced Molting

Zhang

Chen

Wen

et al. 2021

Genes

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Eimeria maxima infection impacts the protein utilisation of broiler chicks from 14 to 28 days of age

Freitas¹,

Dorigam²,

Reis³

et al. 2023

animal

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Response of broilers to dietary balanced protein. 1. Feed intake and growth

et al. 2021

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Context Knowing the broilers’ response to the intake of balanced protein allows nutritionists to choose the optimal level to be used in the feed. Aims The objective of the present study was to describe the response of male and female broilers of two commercial strains to a range of dietary balanced protein levels. Methods In total, 2496 sexed chicks (equal numbers of Ross 308 and Cobb 500) were used. Six dietary balanced protein levels × two strains × two sexes (24 treatments) were randomly allocated to 96-floor pens, using four replications of 26 chicks each. Feed intake, bodyweight, feed conversion efficiency, carcass weight and the weights of the breast without skin, thigh plus drum (leg) and wing were measured at 14, 28, 42 and 56 days of age. Key results Feed intake in all periods in both strains and sexes increased as the dietary balanced protein level decreased, and then decreased markedly at the lowest balanced protein levels. Only at 14 days did the responses differ between strains and sexes; in all other cases, the responses differed only between sexes. At 14 days, the response in bodyweight differed between strains and sexes, whereas at all other samplings they differed only between sexes. The response in carcass, breast and wing yield at 14 days was the same for both strains and sexes but differed between strains and sexes at 28 days. At 42 and 56 days, the response differed only between sexes. The response in leg (thigh-plus-drum) weight at 14 days was the same for both strains and sexes, but after that differed between sexes only. Body lipid content increased linearly initially, and then quadratically, as dietary protein content was reduced. Conclusions Appropriate equations are presented for describing the above responses of broiler chickens, male and female, from two commercial strains. Implications The fitted equations may be used to calculate the optimum economic level of dietary balanced protein to be used under different economic circumstances.

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A description of the growth and moulting of feathers in commercial broilers

Cited by 6 publications

References 11 publications

Transcriptomic Analysis of Laying Hens Revealed the Role of Aging-Related Genes during Forced Molting

Transcriptomic Analysis of Laying Hens Revealed the Role of Aging-Related Genes during Forced Molting

Eimeria maxima infection impacts the protein utilisation of broiler chicks from 14 to 28 days of age

Response of broilers to dietary balanced protein. 1. Feed intake and growth

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