Salmonella Enteritidis infection, corticosterone levels, performance and egg quality in laying hens submitted to different methods of molting

Filho, Raphael Lúcio Andreatti; Milbradt, Elisane Lenita; Okamoto, Adriano Sakai; Silva, Tânia Mara da; Vellano, Igor Henrique Bastos; Gross, Letícia; Oro, CS; Hataka, Alessandre

doi:10.3382/ps/pez248

Cited by 12 publications

(10 citation statements)

References 47 publications

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“…Molting is a natural period of metabolic and physiological changes in birds with seasonal reproduction, but can also be induced in poultry to rejuvenate laying hens for a second or third production cycle, resulting in higher egg production (EP), egg weight (EW), and egg quality parameters (Andreatti Filho et al, 2019;Wolc et al, 2020). Molting is induced in the poultry sector to reduce production costs, generating a second additional productive cycle without the need to replace birds or introduce new flocks (Morales et al, 2018b).…”

Section: Introductionmentioning

confidence: 99%

Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens

Morales-Suárez¹,

Ospina-Rojas²,

Méndez-Arteaga³

et al. 2021

Revista Brasileira De Zootecnia

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Non-ruminantsFull-length research article Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens ABSTRACT -An experiment with 23 diets was performed to evaluate the effect of digestible lysine (Lys), digestible methionine + cysteine (Met+Cys), and digestible threonine (Thr) on egg production of H&N Brown second-cycle laying hens (SCLH) for 20 weeks (92-111 weeks of age) in cages under environmental conditions. Body weight (BW), feed intake (FI), feed conversion ratio (FCR), egg weight (EW), number of hen-housed eggs, and livability were also evaluated during the experiment. Diets were formulated from a central composite design that combined five levels of Lys, Met+Cys, and Thr ranging from 727 to 1159, 662 to 1055, and 552 to 882 mg/kg, respectively. Egg production (EP) data were evaluated through three different modeling strategies: egg production models, multivariate polynomial models, and artificial neural networks (ANN). A cascade-forward neural network with logsigmoid transfer function was selected as the best model according to goodness-offit statistics in both identification and validation data. One of the best scenarios for EP of H&N Brown SCLH under specific outdoor conditions was established at Lys, Met+Cys, and Thr levels of 1138, 1031, and 717 mg/hen• day, respectively. The ANN model may be an appropriate tool to study and predict EP of H&N Brown SCLH based on the combination of three different levels of essential digestible amino acids. The strategies included in this work may contribute to improving poultry performance based on modeling techniques to study other production parameters in terms of different nutritional requirements and productive conditions.

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Section: Introductionmentioning

confidence: 99%

Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens

Morales-Suárez¹,

Ospina-Rojas²,

Méndez-Arteaga³

et al. 2021

Revista Brasileira De Zootecnia

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“…There is no melanocytic component in the normal ovarian tissue [ 20 ], and these symptoms are caused by the deposition of melanoma [ 21 ] and ovarian cysts [ 22 ] caused by senility. Therefore, it was once again proven that layers became weaker during the NM process, but FM can improve the health of laying hens [ 6 ].…”

Section: Discussionmentioning

confidence: 99%

“…FM is the artificial application of some external pressure to layers to make the hens stop laying eggs, lose weight (<30%), and lose feathers. The hens recover their strength by regaining their previous weight and growing new feathers until the ELR gradually returns to the second peak of egg production [ 6 ]. The common methods of FM are fasting, hormonal, chemical, and combined (fasting-chemical) methods.…”

Section: Introductionmentioning

confidence: 99%

Understanding Transcriptomic and Serological Differences between Forced Molting and Natural Molting in Laying Hens

Zhang

Ning

Chen

et al. 2021

Genes

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Molting is natural adaptation to climate change in all birds, including chickens. Forced molting (FM) can rejuvenate and reactivate the reproductive potential of aged hens, but the effect of natural molting (NM) on older chickens is not clear. To explore why FM has a dramatically different effect on chickens compared with NM, the transcriptome analyses of the hypothalamus and ovary in forced molted and natural molted hens at two periods with feathers fallen and regrown were performed. Additionally, each experimental chicken was tested for serological indices. The results of serological indices showed that growth hormone, thyroid stimulating hormone, and thyroxine levels were significantly higher (p < 0.05) in forced molted hens than in natural molted hens, and calcitonin concentrations were lower in the forced molted than in the natural molted hens. Furthermore, the transcriptomic analysis revealed a large number of genes related to disease resistance and anti-aging in the two different FM and NM periods. These regulatory genes and serological indices promote reproductive function during FM. This study systematically revealed the transcriptomic and serological differences between FM and NM, which could broaden our understanding of aging, rejuvenation, egg production, and welfare issues related to FM in chickens.

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“…Therefore, the health conditions of the fallopian tube will directly affect egg production performances ( Madekurozwa and Mpango, 2018 ). It has been found that infections resulting from bacteria, viruses, or mycoplasmas are common among laying chicken flocks and mainly lead to lowered egg production owing to the atrophic fallopian tube ( Andreatti Filho et al., 2019 ). In addition, the egg laying rates of older hens decrease significantly owing to reductions in follicle numbers.…”

Section: Discussionmentioning

confidence: 99%

“…Molt induction is an important tool used to prolong the production cycles of laying hens by egg producers on commercial poultry farms ( Andreatti Filho et al., 2019 ). Artificially forced molting causes the layer hens to lose body weight and shed feathers due to hunger and light deprivation.…”

Section: Introductionmentioning

confidence: 99%

Improving effects of Epimedium flavonoids on the selected reproductive features in layer hens after forced molting

Huo

Guo

et al. 2020

Poultry Science

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In the present study, for the purpose of investigating the effects of the total flavonoids of Epimedium ( TFE ) in regard to preventing the development of atrophied oviducts and follicles induced by forced molting, 300-day-old Hy-Line Brown layer hens were divided into 3 study groups as follows: the control ( CON ) group was the normal group, without forced molting and TFE treatments; the TFE1 group was treated by adding a 1‰ TFE treatment after forced molting; and the TFE0 group was not treated by TFE after forced molting. During this study's experimental process, the egg production rates were recorded each day. In addition, the hens were randomly chosen to be weighed every 4 D and also randomly selected to be sacrificed every 7 D. Then, sample tissues of albumen-secreting part and uterus from the fallopian tube of the layer hens were collected for PCR and hematoxylin-eosin staining tests. The results showed that the body weights, number of follicles, and weights and sizes of the fallopian tube for the TFE1 and TFE0 groups were significantly reduced when compared with those of the control group on the 15th D of the experiment. Furthermore, at the end of study, it was found that the egg production rates, weights of the fallopian tube, and ovarian follicles of TFE1 had recovered to normal levels. At the same time, the serum estrogen and the expressions of the progesterone receptor and estrogen receptor mRNA in fallopian tube were higher than those observed for the TFE0 group. The results of this study provided valuable evidence that TFE could improve the development of atrophied oviducts and increase the egg laying rates, thereby making it a potential multicomponent natural drug for egg production in the future.

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Salmonella Enteritidis infection, corticosterone levels, performance and egg quality in laying hens submitted to different methods of molting

Cited by 12 publications

References 47 publications

Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens

Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens

Understanding Transcriptomic and Serological Differences between Forced Molting and Natural Molting in Laying Hens

Improving effects of Epimedium flavonoids on the selected reproductive features in layer hens after forced molting

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