scholarly journals Transient hypothyroidism reinitiates egg laying in turkey breeder hens: termination of photorefractoriness by propylthiouracil

1997 ◽  
Vol 76 (12) ◽  
pp. 1776-1782 ◽  
Author(s):  
T Siopes
Keyword(s):  
Egg Laying ◽  
Breeder Hens ◽  
Transient Hypothyroidism

scholarly journals Genistein improves the reproductive performance and bone status of breeder hens during the late egg-laying period

2019 ◽  
Vol 98 (12) ◽  
pp. 7022-7029 ◽  
Author(s):  
Z.P. Lv ◽  
S.J. Yan ◽  
G. Li ◽  
D. Liu ◽  
Y.M. Guo
Keyword(s):  
Reproductive Performance ◽  
Egg Laying ◽  
Bone Status ◽  
Breeder Hens

scholarly journals Optimization of Dietary Zinc Requirement for Broiler Breeder Hens of Chinese Yellow-Feathered Chicken

Animals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 472 ◽  
Author(s):  
L. Li ◽  
K. F. M. Abouelezz ◽  
Z. Gou ◽  
X. Lin ◽  
Y. Wang ◽  
...  
Keyword(s):  
Breaking Strength ◽  
Basal Diet ◽  
Ash Content ◽  
Egg Laying ◽  
Broiler Breeders ◽  
Dietary Zinc ◽  
Broiler Breeder ◽  
Breeder Hens ◽  
Zn Content ◽  
Broiler Breeder Hens

This study aimed to establish the optimal dietary zinc requirement of Chinese yellow-feathered Lingnan broiler breeders. A total of 576 breeder hens aged 58 weeks were randomly assigned to six treatments, each with 6 replicates of 16 birds (n = 96/treatment). The hens were fed either a basal diet (22.81 mg/kg Zn) or the same basal diet supplemented with additional 24, 48, 72, 96, and 120 mg Zn/kg up to 65 weeks of age. Compared to the results of birds fed the basal diet (22.81 mg Zn/kg), the dietary supplementation with additional Zn (mg/kg) showed higher egg laying rate (at 48–120 mg), EM (at 96 mg/kg), yolk Zn content (at 24–120 mg/kg), fertility (at 48–120 mg/kg), hatchability (at 48–96 mg/kg), tibial breaking strength (at 24–48 mg/kg), tibial ash content (at 48 mg/kg), serum CuZnSOD activity (at 72 mg/kg) and T-AOC (at 48 mg/kg), and ovarian CuZnSOD and GSH-Px activities (at 96–120 mg/kg), and lower FCR (at 96 mg/kg). The regression model showed that the optimal supplemental Zn for maximal egg laying rate, yolk Zn content, fertility, and hatchability of Chinese yellow-feathered broiler breeders aged 58 to 65 weeks were 71.09, 92.34, 94.44 and 98.65 mg/kg diet, respectively.

scholarly journals RNA Expression Profile and Alternative Splicing Signatures of Genistein-Treated Breeder Hens Revealed by Hepatic Transcriptomic Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Zengpeng Lv ◽  
Jingle Jiang ◽  
Chao Ning ◽  
Hongjian Dai ◽  
Song Jin ◽  
...  
Keyword(s):  
Alternative Splicing ◽  
Immune Function ◽  
Expression Profiles ◽  
Egg Laying ◽  
High Dose ◽  
Rna Expression ◽  
Broiler Breeder ◽  
Breeder Hens ◽  
Laying Performance ◽  
Hepatic Transcriptome

Little information has been available about the influence of dietary genistein (GEN) on hepatic transcriptome of laying broiler breeder (LBB) hens. The study is aimed at broadening the understanding of RNA expression profiles and alternative splicing (AS) signatures of GEN-treated breeder hens and thereby improving laying performance and immune function of hens during the late egg-laying period. 720 LBB hens were randomly allocated into three groups with supplemental dietary GEN doses (0, 40 mg/kg, and 400 mg/kg). Each treatment has 8 replicates of 30 birds. Dietary GEN enhanced the antioxidative capability of livers, along with the increased activities of glutathione peroxidase and catalase. Furthermore, it improved lipid metabolic status and apoptotic process in the liver of hens. 40 mg/kg dietary GEN had the better effects on improving immune function and laying performance. However, transcriptome data indicated that 400 mg/kg dietary GEN did negative regulation of hormone biosynthetic process. Also, it upregulated the expressions of EDA2R and CYR61 by the Cis regulation of neighbouring genes (lncRNA_XLOC_018890 and XLOC_024242), which might activate NF-κB and immune-related signaling pathway. Furthermore, dietary GEN induced AS events in the liver, which also enriched into immune and metabolic process. Therefore, the application of 40 mg/kg GEN in the diet of breeder hens during the late egg-laying period can improve lipid metabolism and immune function. We need to pay attention to the side-effects of high-dose GEN on the immune function.

scholarly journals 156 Modeling Energy Requirement of Chinese Yellow broiler breeder hens during egg-laying period.

2018 ◽  
Vol 96 (suppl_3) ◽  
pp. 290-290
Author(s):  
Z Gou ◽  
Z Jiang ◽  
L Li ◽  
X Lin ◽  
Y Wang ◽  
...  
Keyword(s):  
Energy Requirement ◽  
Egg Laying ◽  
Broiler Breeder ◽  
Breeder Hens ◽  
Broiler Breeder Hens

Alpha‐lipoic acid improves the reproduction performance of breeder hens during the late egg‐laying period

2020 ◽  
Vol 104 (6) ◽  
pp. 1788-1797
Author(s):  
Hongjian Dai ◽  
Zengpeng Lv ◽  
Chenhui Hu ◽  
Zhicheng Shi ◽  
Xihui Wei ◽  
...  
Keyword(s):  
Lipoic Acid ◽  
Egg Laying ◽  
Alpha Lipoic Acid ◽  
Breeder Hens ◽  
Reproduction Performance

scholarly journals Physiological Characteristics of a Molt and Second Cycle of Egg Laying in Turkey Breeder Hens ,

1986 ◽  
Vol 65 (12) ◽  
pp. 2335-2342 ◽  
Author(s):  
W.T. CLEAVER ◽  
V.L. CHRISTENSEN ◽  
J.F. ORT
Keyword(s):  
Egg Laying ◽  
Physiological Characteristics ◽  
Breeder Hens

scholarly journals Mathematical Models for Egg Production in Broiler Breeder Hens

2016 ◽  
Vol 16 (4) ◽  
pp. 1185-1198 ◽  
Author(s):  
Agnieszka Otwinowska-Mindur ◽  
Małgorzata Gumułka ◽  
Joanna Kania-Gierdziewicz
Keyword(s):  
Mathematical Models ◽  
Egg Production ◽  
Goodness Of Fit ◽  
Reproductive Potential ◽  
Egg Laying ◽  
Broiler Breeders ◽  
Egg Weight ◽  
Broiler Breeder ◽  
Breeder Hens ◽  
Broiler Breeder Hens

Abstract Broiler breeders hens (meat-type hens) have lower reproductive potential than laying-type hens. Statistical models for predicting potential laying pattern are important for economically optimal breeding strategy of egg production in a poultry flock. The aim of the study was to find the most suitable function for describing the egg-laying rate and egg weight during the broiler breeders’ production period and to characterize laying pattern in groups of hens with different egg production. The following four mathematical models were used: gamma, Narushin-Takma, logistic-curvilinear, and compartmental. The daily recorded egg production data from 100 broiler breeder hens were used. Hen-weekly egg production was described using laying rate during successive weeks after reaching sexual maturity (26 weeks of age) and daily recorded egg weight. On the basis of the total number of eggs laid (NEggs), groups of hens with low (21%), intermediate (52%), and high (27%) egg production were created. The differences between the goodness-of-fit criteria values (AIC, R2 MSE) were small, with all the examined models having the same quality of curve fitting for egg-laying rate and egg weight. The logistic-curvilinear model was able to fit well both egg-laying rate and egg weight of the whole broiler breeder hens’ flock, and also when hens were divided into three egg production groups. This model could be considered in a long-term prediction of the reproductive potential in the commercial management. Moreover, the presented model could be useful in the research on different reproduction parameters of individual hens.

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