The Microstructure of Egg Shell Waste Treated with H3PO4, In vitro Solubility 
 in Different Particle Size and the Using Effect on the Egg Shell Quality of 
 Laying Hens

Ideally balanced dietary protein is critical for laying hen egg production and feed efficiency, but also affects other important characteristics. This research was designed to study the nonegg production and feed intake response of Lohmann-LSL Lite hens to 550, 625, 700, 775, and 850 mg d−1 of amino acid balanced digestible lysine (Dlys) from 27 to 66 wk of age. Data collection included hen weight (HW), feather scoring, tissue weights, egg specific gravity, egg component weights, and excreta nitrogen (N) content. The experiment was a completely randomized design and level of significance was fixed at P ≤ 0.05. Hen weight (quadratic, Q), pectoralis muscle (absolute, % – Q), and abdominal fat (absolute – linear, L; % – Q) increased with increasing Dlys intake. Although gastrointestinal segment weights and lengths were affected by Dlys intake, interpretation of results was confounded by other aspects of diet composition. Hen feather score (L) and excreta N content (Q) increased, and egg shell quality (L) decreased with increasing Dlys intake. Absolute egg component weights increased with Dlys intake, but effects on proportional weights were Q and relatively minor. In conclusion, balanced Dlys intake affected a variety of practical nonproduction characteristics in laying hens.

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The Lack of Response of 25-Hydroxy-Vitamin D3 on Egg Shell Quality or Other Criteria in Laying Hens

Poultry Science ◽

10.3382/ps.0551983 ◽

1976 ◽

Vol 55 (5) ◽

pp. 1983-1985 ◽

Cited By ~ 19

Author(s):

D.A. Roland ◽

R.H. Harms

Keyword(s):

Vitamin D3 ◽

Laying Hens ◽

Shell Quality ◽

Egg Shell

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Factors Affecting Egg Internal Quality and Egg Shell Quality in Laying Hens

The Journal of Poultry Science ◽

10.2141/jpsa.41.161 ◽

2004 ◽

Vol 41 (3) ◽

pp. 161-177 ◽

Cited By ~ 148

Author(s):

Juliet R. Roberts

Keyword(s):

Laying Hens ◽

Internal Quality ◽

Factors Affecting ◽

Shell Quality ◽

Egg Shell

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Adequate calcium nutrition and quality of egg shell and bones in layers: Innovative approach

Biotechnology in Animal Husbandry ◽

10.2298/bah1103485l ◽

2011 ◽

Vol 27 (3) ◽

pp. 485-497 ◽

Cited By ~ 1

Author(s):

M. Lukic ◽

Z. Pavlovski ◽

Z. Skrbic

Keyword(s):

Vitamin D ◽

Calcium Metabolism ◽

Egg Quality ◽

Adequate Nutrition ◽

Shell Quality ◽

Factors Influencing ◽

Complex Approach ◽

Egg Shell ◽

Micro Elements

Calcium metabolism (Ca) in layers depends on many factors which can be divided into factors influencing the intake, absorption, retention and/or excretion of Ca. Varying of any of above mentioned factors presented and reviewed in this study, exhibit their impact on quality of bones in layers and egg shell quality. For the purpose of maintaining of the egg quality and quality of layer hens? bones, the influence of mentioned factors on production should be taken into consideration in the practice, and on that basis not only the proper diet Ca level determined, but also adequate source and size of Ca particles, as well as mutual balance with other nutrients in the diet, primarily phosphorus, vitamin D and some micro elements. Recent studies have the direction of finding the more complex approach to solving of the issues of egg shell quality, also bone quality and ensuring adequate nutrition for modern layer hybrids.

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