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 Reproductive Performance of Pheasant Breeder Hens

1968 ◽  
Vol 47 (6) ◽  
pp. 1858-1862 ◽  
Author(s):  
L.T. Smith ◽  
R.S. Hinkson ◽  
L.E. Ousterhout
Keyword(s):  
Reproductive Performance ◽  
Breeder Hens

scholarly journals Effect of dietary phosphorus and phytase levels on the reproductive performance of large white turkey breeder hens

2005 ◽  
Vol 84 (3) ◽  
pp. 485-493 ◽  
Author(s):  
J.L. Godwin ◽  
J.L. Grimes ◽  
V.L. Christensen ◽  
M.J. Wineland
Keyword(s):  
Reproductive Performance ◽  
Large White ◽  
Breeder Hens ◽  
Dietary Phosphorus

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.

The early bird catches the worm: age-specific arrival time influences reproductive performance in the White Stork Ciconia ciconia

Bird Study ◽  
2019 ◽  
Vol 66 (1) ◽  
pp. 121-129
Author(s):  
Bourhane-Eddine Belabed ◽  
Mohammed Athamnia ◽  
Laïd Touati ◽  
Farrah Samraoui ◽  
Abdennour Boucheker ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Age Groups ◽  
Egg Laying ◽  
White Stork ◽  
Laying Date ◽  
First Year ◽  
Arrival Date ◽  
Breeding Colony ◽  
Ciconia Ciconia ◽  
The Impact

<sec><title>Capsule</title>Age, arrival date and egg laying date are essentially closely related and determine reproductive performance in the White Stork Ciconia ciconia.</sec><sec><title>Aims</title>To describe the impact of age, arrival date and egg laying date on breeding success in the White Stork.</sec><sec><title>Methods</title>Ringing data from a White Stork breeding colony of 212 nests at Dréan, Algeria, were used to model the relationship between age, arrival date, laying date and reproductive performance. Seventy breeders that were individually colour-ringed as nestlings were monitored.</sec><sec><title>Results</title>Birds breeding on the periphery of the colony had significantly smaller nests and showed a tendency towards later laying dates, but they did not differ from centrally nesting birds in age or arrival date. First year birds did not breed and second year birds were significantly more likely than older age groups to occupy nests but fail to lay eggs. Older birds arrived earlier at the breeding colony and had a higher probability of initiating laying than younger birds. They also had a higher probability of nesting successfully and fledging a larger number of young.</sec><sec><title>Conclusion</title>Age determined arrival and laying dates and influenced breeding performance in the White Stork.</sec>

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