Desempenho e qualidade dos ovos de diferentes linhagens de poedeiras comerciais pós-muda forçada recebendo rações com níveis variáveis de cálcio

Albano, Milton; Albuquerque, Ricardo de; Lima, C.G.; Ghion, Esleibe; Lima, Fabiano Guasti; Morais, Cintra Suzane Dias

doi:10.1590/s1413-95962000000400015

Cited by 3 publications

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Effect of different vitamin D sources and calcium levels in the diet of layers in the second laying cycle

Nascimento

Murakami

Guerra

et al. 2014

Rev. Bras. Cienc. Avic.

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This study evaluated the effects of different sources of vitamin D and calcium levels on performance, egg quality and bone strength of hens in the second production cycle. A total of 384 Hy-Line W36 birds with 80 weeks of age were used, alloted into 3 x 4 factorial design (sources of vitamin D: cholecalciferol; 25(OH)D 3 and 1.25(OH) 2 D 3 x calcium levels: 2.85, 3.65; 4.45 and 5.25%) with four replicates and eight birds each. The performance was evaluated for three cycles of 28 days each, egg quality was evaluated in the last four days of each cycle and bone strength on the last day of the experimental period. There was no interaction (p> 0.05) between the different sources of vitamin D and calcium levels in all parameters evaluated. There was a quadratic effect (p<0.05) of calcium levels in egg production and feed conversion (kg/kg and kg/dz), with better results at levels of 4.12%, 4.09% and 4.14%, respectively. Calcium levels had no effect (p> 0.05) in the egg weight and Haugh unit, but there was a linear increase (p <0.05) in the percentage and eggshell thickness, in specific gravity and bone strength. The different sources of vitamin D influenced (p<0.05) the egg production rate, feed conversion, egg weight and Haugh unit. Thus, the results of this study suggest that the recommended calcium level for laying on second cycle is between 4.09% and 4.14% and that the metabolites cholecalciferol and 25(OH)D 3 improved the performance and egg quality. Regarding bone strength was improved as the calcium levels were increased in diets.

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Effect of different vitamin D sources and calcium levels in the diet of layers in the second laying cycle

Nascimento

Murakami

Guerra

et al. 2014

Rev. Bras. Cienc. Avic.

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Limestone and oyster shell for brown layers in their second egg production cycle

Pizzolante¹,

Kakimoto²,

Saldanha³

et al. 2011

Rev. Bras. Cienc. Avic.

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This study aimed at evaluating the effect of dietary calcium levels and the replacement of calcium sources with different particle size compositions on the performance and egg quality of brown layers in their second egg production cycle. A randomized block experimental design was applied with 12 treatments in a 3x4 factorial arrangement: three calcium levels (2.6, 3.2, 3.8 %) and four combinations of calcium sources (1- 100% fine limestone (FL), 2- 50% FL + 50% coarse limestone (CL), 3- 50% FL and 50% oyster shell (OS), 4- 50% FL and 25% CL+ 25 %OS), with six replicates of eight birds each. Calcium sources were analyzed for geometric mean diameter (GMD) and in-vitro solubility. The following performance and egg quality parameters were evaluated: egg weight (EW, g), egg production (% Eggs), egg mass (EM %), feed intake (FI g), feed conversion ratio (FCR kg/dz and FCR kg/kg), mortality (% Mort.), specific egg gravity (SG), percentages of yolk (Y%), albumen (Alb%) and eggshell (ES%), eggshell thickness (EST), eggshell breaking strength (BS), eggshell weight per surface area (EWSA), Haugh unit (HU), yolk index (YI) and yolk color. Performance and internal egg quality were not affected by the treatments (p>0.05). Blocks had a significant effect on (p<0.05) FI and FCR (kg/dz and kg/kg). Treatments significantly influenced external egg quality, which improved as dietary calcium levels increases and when up to 50% fine limestone was replaced by combinations of coarse limestone with oyster shell

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Effects of dietary 25-hydroxycholecalciferol on growth, production performance, eggshell quality and bone traits of brown egg layers housed under commercial conditions

Silva¹

2017

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Desempenho e qualidade dos ovos de diferentes linhagens de poedeiras comerciais pós-muda forçada recebendo rações com níveis variáveis de cálcio

Cited by 3 publications

References 0 publications

Effect of different vitamin D sources and calcium levels in the diet of layers in the second laying cycle

Effect of different vitamin D sources and calcium levels in the diet of layers in the second laying cycle

Limestone and oyster shell for brown layers in their second egg production cycle

Effects of dietary 25-hydroxycholecalciferol on growth, production performance, eggshell quality and bone traits of brown egg layers housed under commercial conditions

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