The Effects of Dietary Phosphorus, Vitamin D3, and 25-Hydroxy Vitamin D3 Levels on Feed Intake, Productive Performance, and Egg and Shell Quality in Two Strains of Force-Molted White Leghorns

Hamilton, R. M. G.

doi:10.3382/ps.0590598

Cited by 22 publications

(6 citation statements)

References 17 publications

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“…However, in the present study, breeder hens failed to demonstrate improvements when 25 (OH)D 3 was added to feeds already containing 2,000 IU vitamin D 3 . Some results in the literature have produced similar outcomes such as those reported by Roland & Harms (1976), Abdulrahim et al (1978), Cohen et al (1978) and Hamilton (1980). An improved conversion into vitamin D is obtained when birds are fed 25 (OH) D 3 , therefore, supplementing breeder hen feeds with this compound was expected to improve eggshell quality (Soares et al, 1976).…”

Section: Resultsmentioning

confidence: 60%

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

et al. 2009

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Section: Resultsmentioning

confidence: 60%

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

et al. 2009

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“…On the other hand, Hamilton (1980) observed that D 3 promoted better egg production and feed conversion ratio (kg/kg) results relative to 25(OH) D 3 .…”

Section: Resultsmentioning

confidence: 91%

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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“…Esses resultados coincidem com os relatos de Hamilton (1980), que também não encontraram diferenças no consumo de ração, na produção e no peso de ovos ao trabalharem Médias seguidas de mesma letra maiúscula (linha) e minúscula (coluna) não diferem (p>0,05) entre si pelo teste Tukey.…”

Section: Resultsunclassified

Vitaminas D e C para poedeiras na fase inicial de produção de ovos

Salvador¹,

Faria

Mazalli³

et al. 2009

R. Bras. Zootec.

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RESUMO -Um experimento foi conduzido com o objetivo de avaliar os efeitos de duas fontes de vitamina D e três níveis de vitamina C sobre as características de desempenho, a qualidade interna e externa dos ovos, os níveis de cálcio total e iônico séricos e a resistência óssea de poedeiras. Foram utilizadas 288 galinhas da linhagem ISA Babcock B300 ® com 23 semanas de idade, durante um período experimental de 12 semanas. Utilizou-se o delineamento inteiramente ao acaso em arranjo Vitamins D and C for laying hens at the initial phase of egg production ABSTRACT -An experiment was conducted to evaluate the influence of two vitamin D sources and three vitamin C levels on performance, internal and external egg quality, and bone strength characteristics. In addition, the total and ionic blood calcium concentrations, bone ash and calcium were determined. Two hundred and eighty eight 23-week-old ISA Babcock B-300 ® laying hens were used during the 12-week study in a 2 × 3 factorial arrangement: vitamin D sources (cholecalciferol and 25-hydroxycholecalciferol -25(OH)D 3 ) and vitamin C levels (0, 100 and 200 ppm) resulting in six treatments with eight replicates of six hens each. The basal cholecalciferol level was 2,756 IU/kg, corresponding to 5.51 g Hy.D ® /t, as source of 25(OH)D 3 . Feed intake, egg production, egg weight and egg mass were not influenced by the treatments. An interaction was observed for feed conversion, which was improved when 25(OH)D 3 was added without vitamin C. Haugh unit and yolk index were not influenced, however, interactions were observed for albumen percent and yolk percent, which were improved when 200 ppm of vitamin C was supplemented. Egg specific gravity, serum calcium, bone ash and bone strength resistance were not influenced by the treatments. There was an interaction for shell percent and shell thickness, which were improved when vitamin C was added in association with 25(OH)D 3 . It was concluded, for laying hens at initial phase of egg production, that feed conversion is improved when 25(OH)D 3 was the vitamin D source, and that shell thickness and shell percent are improved when the vitamin D source was 25(OH)D 3 with diets supplemented with vitamin C (100 or 200 ppm, respectively).Key Words: ascorbic acid, bone strength, egg quality, performance, vitamin D IntroduçãoA obtenção de bons índices zootécnicos de desempenho e qualidade externa dos ovos geralmente resulta em sucesso para o setor produtivo de ovos comerciais. Reconhece-se que a idade é determinante do desempenho e da qualidade interna e externa dos ovos (Faria et al., 1999a). Estima-se que a incidência de ovos quebrados R. Bras.

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The Effects of Dietary Phosphorus, Vitamin D3, and 25-Hydroxy Vitamin D3 Levels on Feed Intake, Productive Performance, and Egg and Shell Quality in Two Strains of Force-Molted White Leghorns

Cited by 22 publications

References 17 publications

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

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

Vitaminas D e C para poedeiras na fase inicial de produção de ovos

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