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https://www.readbyqxmd.com/read/29732750/age-related-changes-of-yolk-precursor-formation-in-the-liver-of-laying-hens
#1
Xing-Ting Liu, Xin Lin, Yu-Ling Mi, Wei-Dong Zeng, Cai-Qiao Zhang
A rapid decline in egg production of laying hens begins after 480 d of age. Such a rapid decrease results predominantly from the ovarian aging, accompanied by endocrine changes, decreased yolk synthesis and accumulation, and the reduction in follicles selected into the preovulatory hierarchy. In this study, hens at 90, 150, 280, and 580 d old (D90, D150, D280, and D580, respectively) were compared for yolk precursor formation in the liver to elucidate effects of aging on laying performance. The results showed that liver lipid synthesis increased remarkably in hens from D90 to D150, but decreased sharply at D580 as indicated by the changes in triglyceride (TG) levels...
May 2018: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/29698073/surgical-extraction-of-viable-hen-gallus-gallus-domesticus-follicles-for-in-vitro-fertilization
#2
Juan J Perez-Rivero, Angel R Lozada-Gallegos, Jose A Herrera-Barragán
Assisted reproduction techniques in birds have been developed for zootechnical purposes and have been adapted for use in conservation of wild bird species. To develop a technique for obtaining follicles in live hens, 5 Rhode Island red hens ( Gallus gallus domesticus) were anesthetized, and abdominal ultrasound was performed to confirm the presence of ovarian follicles. A left celiotomy then was performed to obtain follicles in different stages of maturation for in vitro fertilization. The follicles were located by digital exploration, then extracted by isolating each follicle with the index finger of each hand, holding it by the stigma, and then applying slight traction towards the exterior of the coelomic cavity until the follicle separated from the ovary...
March 2018: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/29695257/comparative-omics-and-feeding-manipulations-in-chicken-indicate-a-shift-of-the-endocrine-role-of-visceral-fat-towards-reproduction
#3
Susanne Bornelöv, Eyal Seroussi, Sara Yosefi, Sharon Benjamini, Shoval Miyara, Mark Ruzal, Manfred Grabherr, Nima Rafati, Anna-Maja Molin, Ken Pendavis, Shane C Burgess, Leif Andersson, Miriam Friedman-Einat
BACKGROUND: The mammalian adipose tissue plays a central role in energy-balance control, whereas the avian visceral fat hardly expresses leptin, the key adipokine in mammals. Therefore, to assess the endocrine role of adipose tissue in birds, we compared the transcriptome and proteome between two metabolically different types of chickens, broilers and layers, bred towards efficient meat and egg production, respectively. RESULTS: Broilers and layer hens, grown up to sexual maturation under free-feeding conditions, differed 4...
April 26, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29599004/pathology-and-distribution-of-velogenic-viscerotropic-newcastle-disease-virus-in-the-reproductive-system-of-vaccinated-and-unvaccinated-laying-hens-gallus-gallus-domesticus-by-immunohistochemical-labelling
#4
A O Igwe, C L Afonso, W S Ezema, C C Brown, J O A Okoye
This study investigated the pathological changes in the reproductive system of laying hens that lead to the poor egg production and quality in Newcastle disease (ND) and the distribution of the virus in the system. Two hundred and forty Isa-Brown pullets were divided randomly into vaccinated and unvaccinated groups (n = 120 each). The vaccinated group was given Hitchner B1 vaccine at 1 day of age, La Sota vaccine at 4 weeks of age and Komarov vaccine at 9 and 16 weeks of age. At the peak of egg production, the laying hens (32 weeks old) were assigned randomly into four groups (n = 60): VC, vaccinated with ND vaccines and inoculated intramuscularly with velogenic viscerotropic ND virus (vvNDV); VU, vaccinated unchallenged; UC, unvaccinated challenged; and UU, unvaccinated unchallenged...
February 2018: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/29518422/egg-specific-ige-and-basophil-activation-but-not-egg-specific-t-cell-counts-correlate-with-phenotypes-of-clinical-egg-allergy
#5
M Cecilia Berin, Alexander Grishin, Madhan Masilamani, Donald Y M Leung, Scott H Sicherer, Stacie M Jones, A Wesley Burks, Alice K Henning, Peter Dawson, Joanna Grabowska, Charuta Agashe, Wendy F Davidson, Robert A Wood, Hugh A Sampson
BACKGROUND: Egg allergy is phenotypically heterogeneous. A subset of patients with egg allergy can tolerate egg in an extensively heated form. Inclusion of baked egg (BE) into the diet accelerates resolution of egg allergy. Conversely, BE reactivity is associated with persistent disease. The immune basis of this clinical heterogeneity is unknown. OBJECTIVES: We sought to study egg-specific antibody, basophil, and T-cell responses in children with reactivity or tolerance to BE...
March 5, 2018: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29427807/isolation-and-culture-of-chicken-growing-follicles-in-2-and-3-dimensional-models
#6
Dan Zhao, Imdad Hussain Leghari, Jian Li, Yuling Mi, Caiqiao Zhang
The isolation and culture of ovarian follicles is essential for the studies of follicular development and function. In contrast to the relative ease of culture for mammalian follicles, developing in vitro cultures of high viability for the much larger avian follicles has always proven to be more challenging. In this study, the growing follicles from domestic hens (Gallus domesticus) were isolated using enzymatic and mechanical methods and then investigated for the optimized conditions for culture. Assessments of viability and hormonal responsiveness were also considered...
April 15, 2018: Theriogenology
https://www.readbyqxmd.com/read/29374087/food-restriction-but-not-fish-oil-increases-fertility-in-hens-role-of-rarres2
#7
Namya Mellouk, Christelle Ramé, Joël Delaveau, Christophe Rat, Maxime Marchand, Frédéric Mercerand, Angélique Travel, Aurélien Brionne, Pascal Chartrin, Linlin Ma, Pascal Froment, Joëlle Dupont
Overfed hens selected for their rapid growth become fatter and develop reproductive disorders. Herein, we aimed to demonstrate that food restriction leading to a weight reduction and/or a supplementation with fish oil may be effective in preventing reproductive disorders through the regulation of adipokine expression in broiler hens. This study included four groups of food restricted (Rt) or ad libitum hens (Ad, feeding at a rate 1.7 times greater than Rt hens) supplemented or unsupplemented with fish oil (1%)...
April 2018: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/29358656/functional-genomics-study-of-acute-heat-stress-response-in-the-small-yellow-follicles-of-layer-type-chickens
#8
Chuen-Yu Cheng, Wei-Lin Tu, Chao-Jung Chen, Hong-Lin Chan, Chih-Feng Chen, Hsin-Hsin Chen, Pin-Chi Tang, Yen-Pai Lee, Shuen-Ei Chen, San-Yuan Huang
This study investigated global gene and protein expression in the small yellow follicle (SYF; 6-8 mm in diameter) tissues of chickens in response to acute heat stress. Twelve 30-week-old layer-type hens were divided into four groups: control hens were maintained at 25 °C while treatment hens were subjected to acute heat stress at 36 °C for 4 h without recovery, with 2-h recovery, and with 6-h recovery. SYFs were collected at each time point for mRNA and protein analyses. A total of 176 genes and 93 distinct proteins with differential expressions were identified, mainly associated with the molecular functions of catalytic activity and binding...
January 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29349677/mercuric-chloride-induced-ovarian-oxidative-stress-by-suppressing-nrf2-keap1-signal-pathway-and-its-downstream-genes-in-laying-hens
#9
Yan Ma, Mingkun Zhu, Liping Miao, Xiaoyun Zhang, Xinyang Dong, Xiaoting Zou
The present study evaluated the effects of mercury chloride (HgCl2 ) on follicular atresia rate, sex hormone secretion, and ovarian oxidative stress in laying hens. Antioxidant enzyme genes and the nuclear factor erythroid 2-related factor 2 (Nrf2)-Kelch-like ECH-associated protein 1 (Keap1) signal pathway were further studied to uncover the molecular mechanism. A total of 768 40-week-old Hy-Line Brown laying hens were randomly allocated to four treatments with eight pens per treatment and 24 hens of each pen...
January 18, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29232906/histology-of-the-ovary-of-the-laying-hen-gallus-domesticus
#10
K Denise Apperson, Karyn E Bird, Gita Cherian, Christiane V Löhr
The laying hen ( Gallus domesticus ) is a robust animal model for epithelial ovarian cancer. The use of animal models is critical in identifying early disease markers and developing and testing chemotherapies. We describe the microscopic characteristics of the normally functioning laying hen ovary and proximal oviduct to establish baselines from which lesions associated with ovarian cancer can be more readily identified. Ovaries and oviducts were collected from 18-month-old laying hens ( n = 18) and fixed in 10% neutral buffered formalin...
December 11, 2017: Veterinary Sciences
https://www.readbyqxmd.com/read/29187833/transcriptome-analysis-on-single-small-yellow-follicles-reveals-that-wnt4-is-involved-in-chicken-follicle-selection
#11
Yiya Wang, Qiuyue Chen, Zemin Liu, Xiaoli Guo, Yanzhi Du, Zhenjie Yuan, Miao Guo, Li Kang, Yi Sun, Yunliang Jiang
Ovarian follicle selection is an important process impacting the laying performance and fecundity of hens, and is regulated by follicle-stimulating hormone (FSH) through binding to its receptor [follicle-stimulating hormone receptor (FSHR)]. In laying hens, the small yellow follicle (6-8 mm in diameter) with the highest expression of FSHR will be recruited into the preovulatory hierarchy during ovarian follicle development. The study of molecular mechanism of chicken follicle selection is helpful for the identification of genes underlying egg-laying traits in chicken and other poultry species...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29180824/genetic-architecture-and-candidate-genes-identified-for-follicle-number-in-chicken
#12
Manman Shen, Hongyan Sun, Liang Qu, Meng Ma, Taocun Dou, Jian Lu, Jun Guo, Yuping Hu, Xingguo Wang, Yongfeng Li, Kehua Wang, Ning Yang
Follicular development has a major impact on reproductive performance. Most previous researchers focused on molecular mechanisms of follicular development. The genetic architecture underlying the number of follicle, however, has yet not to be thoroughly defined in chicken. Here we report a genome-wide association study for the genetic architecture determining the numbers of follicles in a large F2 resource population. The results showed heritability were low to moderate (0.05-0.28) for number of pre-ovulatory follicles (POF), small yellow follicles (SYF) and atresia follicles (AF)...
November 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29152793/effects-of-dietary-tryptophan-levels-on-performance-and-biochemical-variables-of-plasma-and-intestinal-mucosa-in-yellow-feathered-broiler-breeders
#13
S Q Jiang, Z Y Gou, X J Lin, L Li
The effects of dietary tryptophan (Trp) levels on performance and biochemical variables of plasma and intestinal mucosa in broiler breeder hens were investigated in this study. A total of 780 Lingnan yellow-feathered broiler breeder hens were randomly assigned in one of five dietary treatments with six replicates per treatment (26 birds per replicate). The breeder hens were fed either the basal diet (0.11% Trp) or the basal diet supplemented to 0.15%, 0.19%, 0.23% and 0.27% Trp, from 197 to 259 days of age...
February 2018: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29130738/ethylene-glycol-and-dimethyl-sulfoxide-combination-reduces-cryoinjuries-and-apoptotic-gene-expression-in-vitrified-laying-hen-ovary
#14
Reihane Nateghi, AliReza Alizadeh, Yousef Jafari Ahangari, Rouhollah Fathi, Amir Akhlaghi
Successful cryopreservation of avian gonads is important not only for avian breeding but is also crucial for preservation of species, especially of endangered birds. The aim of this study was to evaluate the effect of vitrification by several cryoprotectants on the ovarian tissues of laying hens. Ovarian tissues were randomly divided into six groups: control (nonvitrified: C), dehydrated using ethylene glycol (EG), dehydrated with propylene glycol (PROH), dehydrated using dimethyl sulfoxide (DMSO), and two combined groups, EG+DMSO and EG+PROH...
December 2017: Biopreservation and Biobanking
https://www.readbyqxmd.com/read/29128632/genome-wide-mapping-of-estrogen-receptor-%C3%AE-binding-sites-by-chip-seq-to-identify-genes-related-to-sexual-maturity-in-hens
#15
Miao Guo, Yi Li, Yuxia Chen, Xiaoli Guo, Zhenjie Yuan, Yunliang Jiang
In ovarian follicle development, estrogen acts as a regulatory molecule to mediate proliferation and differentiation of follicular cells. ERα (estrogen receptor α) exerts regulatory function classically by binding directly to the estrogen response element, recruiting co-factors and activating or repressing transcription in response to E2. In this study, we used ChIP-seq to map ERα-binding sites in ovaries of Hy-line Brown commercial hens at 45d, 90d and 160d. In total, 24,886, 21,680 and 23,348 binding sites were identified in the ovaries of hens at 45d, 90d and 160d, which are linked to 86, 83 and 74 genes, respectively...
February 5, 2018: Gene
https://www.readbyqxmd.com/read/28986927/effects-of-phyto-oestrogen-quercetin-on-productive-performance-hormones-reproductive-organs-and-apoptotic-genes-in-laying-hens
#16
J X Yang, M T Chaudhry, J Y Yao, S N Wang, B Zhou, M Wang, C Y Han, Y You, Y Li
Quercetin, a polyphenolic flavonoid with diverse biological activities including anti-inflammatory and antiviral, inhibits lipid peroxidation, prevents oxidative injury and cell death. The purpose of the research was to investigate the effect of quercetin on productive performance, reproductive organs, hormones and apoptotic genes in laying hens between 37 and 45 weeks of age, because of the structure and oestrogenic activities similar to 17β-oestradiol. The trial was conducted using 240 Hessian laying hens (37 weeks old), housed in wire cages with two hens in each cage...
April 2018: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28854741/zona-pellucida-protein-b2-messenger-ribonucleic-acid-expression-varies-with-follicular-development-and-granulosa-cell-location
#17
A P Benson, M N Malloy, J R Steed, V L Christensen, B D Fairchild, A J Davis
The freshly ovulated ovum in avian species is surrounded by a protein layer called the inner perivitelline layer (IPVL). The IPVL contains zona pellucida proteins and 6 distinct zona pellucida genes have been identified (ZPA, ZPB1, ZPB2, ZPC, ZPD and ZPX1) in the chicken. In the present research, the expression of the mRNA for ZPA, ZPB2, and ZPX1 was investigated in 2 lines of turkey hens selected for either increased egg production (E line) or increased body weight (F line). Theca and granulosa cell expression of the mRNA for ZPA and ZPB2 was also investigated in hierarchical and prehierarchical follicles from broiler breeder hens...
September 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28666321/androgens-regulate-ovarian-gene-expression-through-modulation-of-ezh2-expression-and-activity
#18
Xiaoting Ma, Emily Hayes, Anindita Biswas, Christina Seger, Hen Prizant, Stephen R Hammes, Aritro Sen
A substantial amount of evidence suggests that androgen signaling through classical androgen receptors is critical for both normal and pathologic ovarian physiology. Specifically, we and others have shown that, in mouse granulosa cells, androgen actions through both extranuclear and nuclear androgen receptor signaling are critical for normal follicle development and ovulation. Here, we show that androgens through the PI3K/Akt pathway rapidly (within minutes) phosphorylate and inhibit activity of the Polycomb group protein enhancer of zeste homolog 2 (Ezh2)...
September 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28604799/rhythmic-expression-of-circadian-clock-genes-in-the-preovulatory-ovarian-follicles-of-the-laying-hen
#19
Zhichao Zhang, Shuang Lai, Yagang Wang, Liang Li, Huadong Yin, Yan Wang, Xiaoling Zhao, Diyan Li, Mingyao Yang, Qing Zhu
The circadian clock is reported to play a role in the ovaries in a variety of vertebrate species, including the domestic hen. However, the ovary is an organ that changes daily, and the laying hen maintains a strict follicular hierarchy. The aim of this study was to examine the spatial-temporal expression of several known canonical clock genes in the granulosa and theca layers of six hierarchy follicles. We demonstrated that the granulosa cells (GCs) of the F1-F3 follicles harbored intrinsic oscillatory mechanisms in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28532517/expression-of-cocaine-and-amphetamine-regulated-transcript-cart-in-hen-ovary
#20
Pengfei Li, Xuejing Yu, Jianshan Xie, Xiaolei Yao, Wenzhong Liu, Jianbo Yao, Zhiwei Zhu, Lihua Lyu
BACKGROUND: Cocaine- and amphetamine-regulated transcript (CART), discovered initially by via differential display RT-PCR analysis of brains of rats administered cocaine, is expressed mainly in central nervous system or neuronal origin cells, and is involved in a wide range of behaviors, such as regulation of food intake, energy homeostasis, and reproduction. The hens egg-laying rate mainly depends on the developmental status of follicles, expression of CART have not been identified from hen follicles, the regulatory mechanisms of CART biological activities are still unknown...
May 22, 2017: Biological Research
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