The Effect of Estrogens on Egg-Laying Performance

Çiftçi, Hüseyin Baki

doi:10.1016/b978-0-12-800879-9.00041-x

Cited by 3 publications

(4 citation statements)

References 54 publications

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“…Formononetin and biochanin A showed only low prevalence in poultry feed (0.8 and 5%, respectively). Ciftci (2017) [11] noticed that genistin and daidzin remained stable even when subjected to high temperatures during soybean processing and they were not lost during the traditional soybean processing methods. As a result, when domesticated poultry were fed with diets containing corn and soy led to complete absorption of all the genistin and daidzin present in soybeans which might be a contributing factor for higher isoflavone content in the different chicken feeds.…”

Section: Discussionmentioning

confidence: 99%

The level of isoflavones (genistein and daidzein) in different chicken feed formulations

Megha,

Ramnath,

Sapna

et al. 2023

Int. J. Adv. Biochem. Res.

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The objective of the present study was to detect and quantify the level of isoflavones (genistein and daidzein) in different chicken feeds which were formulated based on BIS standards 2007. Six samples of chick mash, chicken grower and chicken breeder feeds used for analysis were procured from poultry feed mills and the samples were incubated with β-glucuronidase for better detection of different isoflavone aglycones and metabolites. The extracted isoflavones were purified by C18 solid phase extraction and analysed by high performance liquid chromatography (HPLC). The mobile phase composition, gradient elution programme and injected volume were optimised for separation efficiency and sensitivity. It is an accurate and precise analytical methodology which shows good reproducibility and can be easily adapted to detect isoflavones. The average genistein concentrations were 279.85 ± 1.30, 84.48±1.97 and 148.26 ± 1.64 µg/100 g in chick mash, chicken grower and chicken breeder respectively. However, the average daidzein concentration was in 276.29 ± 1.57 µg/100 g chick mash, 51.67±1.11 g/100 g in chick grower and 153.16 ± 1.21 µg/100 g in chick breeder. The findings indicated that the concentration of genistein and daidzein in the feeds was positively correlated with the level of soybean in the feed since it is the predominant source of isoflavones.

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Section: Discussionmentioning

confidence: 99%

The level of isoflavones (genistein and daidzein) in different chicken feed formulations

Megha,

Ramnath,

Sapna

et al. 2023

Int. J. Adv. Biochem. Res.

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“…Luteinizing hormone plays an important role in inducing steroidogenesis and follicular development [ 35 ]. It also controls ovulation, with the highest secretion of LH occurring 6 h before ovulation [ 36 ]. Luteinizing hormone affects the production of follicular growth factors and hormones inside the ovaries [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

“…The increase in progesterone synthesis is caused by a decrease in estrogen hormone levels, which is due to an increase in the size of the follicles in the follicular hierarchy, especially the largest follicles (F1) [ 7 ]. Luteinizing hormone is secreted due to positive feedback from progesterone secreted by the pre-ovulation follicles [ 36 ]. The excessive injection of pituitary extract increases estrogen and progesterone levels, causing negative feedback on LH secretion that reduces LH levels and hampers the ovulation process, which, in turn, reduces egg production [ 8 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of follicle-stimulating hormone and luteinizing hormone levels on egg-laying frequency in hens

Prastiya

Madyawati

Sari³

et al. 2022

Vet World

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Background and Aim: Gonadotropins, for example, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), are hormones that affect the reproductive process. In hens, optimal levels of FSH and LH can stimulate follicle growth fairly rapidly and thereby increase egg production through follicle development and increased ovulation. Follicle-stimulating hormone acts in the early stages of follicular growth, whereas LH acts on pre-ovulatory follicles. Normal follicular growth is the result of the complementary action of FSH and LH. Low FSH and LH levels result in the formation of follicles but a lack of egg production in chickens. This study aimed to investigate FSH and LH hormone levels from layer chickens with different egg-laying frequencies. Materials and Methods: Fifty blood serum samples were collected from 54-week-old ISA brown strain hens that were divided into five groups (with 10 hens per group) as follows: Hens that lay eggs (i) every day, (ii) once every 2 days, (iii) twice every 3 days, (iv) 3 times every 4 days, and (v) hens that do not lay eggs. Follicle-stimulating hormone and LH levels were measured in samples using an enzyme-linked immunosorbent assay, and the data were analyzed using multivariate analysis of variance. Results: Follicle-stimulating hormone levels were significantly associated with the frequency of egg laying in ISA brown strain hens (p < 0.05); the highest FSH level (869.005 ± 149.194 pg/mL) was found in hens that lay eggs every day. In contrast, the highest LH level (51.386 ± 2.410 mIU/mL) was found in hens that lay eggs every 2 days. Conclusion: High level of FSH (869.005 ± 149.194 pg/mL) was associated with a high frequency of egg laying (every day) in ISA brown strain hens, and LH level of around 30.406 pg/mL was associated with daily egg laying in these hens.

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“…Therefore, a core transcription factor regulatory network constructed from granulosa cell (GC) super-enhancers facilitates the identification of genes that are essential for follicle development. Sex hormones, including oestrogens and androgens, play a vital role in follicular development ( Condon et al, 2020 ; Çiftci, 2017 ; Couse et al, 2005 ; Hu et al, 2004 ; Shiina et al, 2006 ; Sen et al, 2014 ; Tanaka et al, 2017 ). However, the sex hormones in chickens differ from those in mammals due to their synthesis sites and enrichment trends.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis Among Different Species Reveals That the Androgen Receptor Regulates Chicken Follicle Selection Through Species-Specific Genes Related to Follicle Development

Huang

Luo

et al. 2022

Front. Genet.

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The differences in reproductive processes at the molecular level between viviparous and oviparous animals are evident, and the site in the ovary that synthesizes sex hormones (androgens and oestrogens) and the trends for enriching sex hormones during follicle development in chickens are different from those in mammals, suggesting that the effect of sex hormones on follicle development in chickens is probably different from that in viviparous animals. To explore the specific role of androgen receptors (ARs) on chicken follicular development, we matched the correspondence of follicular development stages among chickens, humans, cows and identified chicken-specific genes related to follicle development (GAL-SPGs) by comparing follicle development-related genes and their biological functions among species (chickens, humans, and cows). A comparison of the core transcription factor regulatory network of granulosa cells (or ovaries) based on super-enhancers among species (chicken, human, and mouse) revealed that AR is a core transcriptional regulator specific to chickens. In vivo experiments showed that inhibition of AR significantly reduced the number of syf (selected stage follicles) in chickens and decreased the expression of GAL-SPGs in F5 follicles, while in vitro experiments showed that inhibition of AR expression in chicken granulosa cells (GCs) significantly down-regulated the expression levels of GAL-SPGs, indicating that AR could regulate follicle selection through chicken-specific genes related to follicle development. A comparison among species (77 vertebrates) of the conserved genomic regions, where chicken super-enhancers are located, revealed that the chicken AR super-enhancer region is conserved in birds, suggesting that the role of AR in follicle selection maybe widespread in birds. In summary, we found that AR can regulate follicle selection through chicken-specific genes related to follicle development, which also emphasizes the important role of AR in follicle selection in chickens and provides a new perspective for understanding the unique process of follicle development in chickens. Our study will contribute to the application of androgens to the control of egg production in chickens and suggests that researchers can delve into the mechanisms of follicle development in birds based on androgen/androgen receptors.

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The Effect of Estrogens on Egg-Laying Performance

Cited by 3 publications

References 54 publications

The level of isoflavones (genistein and daidzein) in different chicken feed formulations

The level of isoflavones (genistein and daidzein) in different chicken feed formulations

Effect of follicle-stimulating hormone and luteinizing hormone levels on egg-laying frequency in hens

Comparative Analysis Among Different Species Reveals That the Androgen Receptor Regulates Chicken Follicle Selection Through Species-Specific Genes Related to Follicle Development

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