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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.22.0003    [Accepted] Published online May 2, 2022.
Interactive effect of dietary levels of calcium and 25-hydroxy vitamin D3 on the performance, serum biochemical concentration and digestibility of laying hens from 61 to 70 weeks of age
Chun Ik Lim1  , Kyeong Seon Ryu1,* 
Department of Animal Science, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Korea
Correspondence:  Kyeong Seon Ryu, Tel: +82-063-270-2638, Fax: +82-063-270-2612, Email: seon@jbnu.ac.kr
Received: 1 January 2022   • Revised: 20 March 2022   • Accepted: 2 May 2022
Abstract
Objective
The present research was conducted to evaluate the interactive effect of dietary concentration of calcium (Ca) and 25-hydroxy vitamin D3 (25OHD3) on the performance, blood composition and digestibility of laying hens.
Methods
A total of 540 Hy-line brown laying hens aged 61 to 70 weeks were randomly allotted in a 3 × 3 factorial arrangement, consisting of three levels of 25OHD3 (0, 25, and 50 µg/kg) and three levels of Ca (3.5, 4.0, and 4.5%). All diets had basal concentration of 3,000 IU/kg of vitamin D3 including the 2,800 kcal/kg of metabolic energy (ME) and 16% of crude protein (CP).
Results
The results showed that interactive effect (P<0.05) between Ca and 25OHD3 was such that dietary 25OHD3 linearly increased interleukin-6 (IL-6) at all levels of Ca inclusion. Interaction (P<0.05) occurred with the highest parathyroid hormone (PTH) in laying hens that received dietary concentration of Ca (3.5%) with 25OHD3 (50 µg/kg), and Ca (4.0%) with 25OHD3 (50 µg/kg). Egg production and egg weight significantly (P<0.05) increased in the 4.5% Ca group compared to the 3.5 to 4.0% Ca groups. Egg shell thickness and tibia bone length also increased (P<0.05) in groups fed a high-Ca diet (4.0 to 4.5%). Phosphorus digestibility significantly (P<0.05) increased along with dietary Ca level. Among the tested 25OHD3 groups, higher (P<0.05) egg production and tibia thickness were present in hens fed 50 µg/kg of 25OHD3. Furthermore, Ca digestibility serum Ca and 25OHD3 were significantly increased in group offered 50 µg/kg of 25OHD3.

Conclusion

The result gathered in this study indicate that dietary concentrations of 4.0 to 4.5% Ca and 50 µg/kg 25OHD3 improve the performance of hens from 61 to 70 weeks of age.
Keywords: Calcium; 25-Hydroxy Vitamin D3; Laying Hens; Nutrition Digestibility; Performance; Serum Concentration


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