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RESEARCH ARTICLE

Dietary supplementation with protected calcium effects production and egg quality of Hy-line brown laying hens

H. Shi A , K. Y. Lee A and I. H. Kim A B
+ Author Affiliations
- Author Affiliations

A Department of Animal Resource and Science, Dankook University, Cheonan, Choongnam 31116, South Korea.

B Corresponding author. Email: inhokim@dankook.ac.kr

Animal Production Science 60(15) 1793-1799 https://doi.org/10.1071/AN19017
Submitted: 17 January 2019  Accepted: 29 February 2020   Published: 19 May 2020

Abstract

Context: Currently, the commonly used dietary calcium sources are not sufficiently bioavailable to be used for eggshell formation or bone health in laying hens. Protected calcium, a blend of calcium and medium-chain fatty acids with matrix coating, may exert an effective absorption and metabolism ability for calcium consumption in the laying hen.

Aims: The present study was conducted to evaluate the effects of protected-calcium supplementation on egg production, egg quality, and serum calcium and phosphorus concentrations in laying hens.

Methods: In total, 144 Hy-line brown laying hens (25 weeks old) were randomly allotted to three treatments (8 replicates with 6 hens, 1 hen per cage) in a 10-week trial. Treatments consisted of corn–wheat–soybean meal-based basal diet with limestone (coarse limestone : fine limestone = 50 : 50) as a calcium source (CON) or basal diet supplemented with 0.5% (P1) or 1% (P2) protected calcium in substitution for an equal quantity of coarse limestone. Data were statistically analysed using linear and quadratic contrast with the GLM procedure of SAS. Probability values of <0.05 indicate significance.

Key results: At Weeks 31–33 and 35, the cracked-egg rates were lower in the P1 and P2 groups than in the CON group (P < 0.05; linear, P < 0.05) and, at Weeks 29 and 34, the cracked-egg rates in the P2 group were also significantly (P < 0.05) decreased. At Weeks 26, 30 and 32, the Haugh units in the P2 group were significantly (P < 0.05) higher than those in the CON group. In addition, eggshell strength was increased significantly (P < 0.05) in the P2 group at Weeks 26, 27 and 31–35. The serum calcium concentration of the P2 group was significantly (P < 0.05) greater than that of the CON group in the morning.

Conclusions: In conclusion, a replacement of limestone with 1% protected calcium can increase eggshell quality.

Implications: Protected-calcium supplementation can be used in practice for decreasing the breakage of eggs.

Additional keywords: calcium concentration, cracked-egg rate, phosphorus concentration.


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