Impact of Different Levels of Vitamin D3 in Laying Hens Diet on Various Aspects of the Eggs

Petru Alexandru Vlaicu, Tatiana Dumitra Panaite, Alexandra Oancea, Gabriela Maria Cornescu, Ovidiu Avram

Abstract


An experiment was conducted to assess the impact of vitamin D3, on laying hens' performances, egg yolk fatty acid profile (FA), antioxidant compounds and vitamin transfer in the eggs. For that, one hundred twenty, 34 weeks old Lohmann Brown laying hens, were allocated to completely randomized block arrangement of three dietary treatments: T1, control (C) with 2500 IU/kg vitamin D3; T2 with 3000 IU/kg vitamin D3 and T2, with 3200 IU/kg vitamin D3. All diets had identical basal diet structure containing 17.50% crude protein and 2780 kcal/kg, metabolizable energy, being isocaloric and isonitrogenous. Feed intake and feed conversion ratio were significantly (p<0.05) lower in T2 and T3 groups compared to T1, without any impact on average egg weight. Egg production was significantly (p<0.05) higher only in T2 group, compared with T1 and T3. No significant (p>0.05) contribution of vitamin D3 supplementation was observed on total saturated fatty acids (SFA), unsaturated fatty acids (UFA) or monounsaturated fatty acids (MUFA) classes determined in egg yolk. From the sum of cis FA, significantly (p<0.005) higher was palmitoleic FA in T1 egg yolk compared with T2 and T3 egg yolks. On the other hand, from the total trans group, nervonic FA was significantly (p<0.05) higher in eggs belonging to higher vitamin D3 supplement groups. Total polyunsaturated fatty acids (PUFA), were significantly (p<0.05) higher in T2 and T3 egg yolks compared with T1 egg yolk. However, n-3 increase significantly only in T3 yolks being with 43.92% higher compared with T1 yolk and with 35.51% higher compared with T2 yolk. From the antioxidant compounds, total polyphenol content, total antioxidant capacity, lutein and zeaxanthin, vitamin A and vitamin E registered slightly higher values in T2 and T3 eggs versus T1 eggs, but without significant (p>0.05) effect. Vitamin D3 transfer in eggs increased significantly (p<0.05) in T3 compared with T1 and T2 eggs, as a main effect of supplemental vitamin D3 in laying hens' diets.


Keywords


antioxidants, cholecalciferol, egg quality, fatty acids, laying hens, vitamin D3.

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LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Bioengineering Faculty of Animal Resources
300645, Timişoara, Calea Aradului 119, Romania

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