Calcium levels and limestone particle size in the diet of commercial layers at the end of the first production cycle

Pelícia, K; Garcia, Edivaldo Antônio; Móri, Cleusa; Faitarone, Abg; Silva, AP; Molino, AB; Vercese, Francine; Berto, Dirlei Antônio

doi:10.1590/s1516-635x2009000200003

Cited by 32 publications

(33 citation statements)

References 16 publications

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“…Similar results were observed by Vieira et al (2011), when evaluating the calcium levels of 28, 33 and 38 g/kg in the diet of brown egg layers from 40 weeks of age, and by Pelícia (2009b), in an experiment with brown egg layers in the period from 59 to 70 weeks of age fed diets containing the calcium levels of 30, 35, 40 and 45 g/kg. These authors verified increase in the calcium excretion, in g/bird/day and in g/kg, respectively, and attributed this result to the concentration of calcium in the diet.…”

Section: Resultssupporting

confidence: 80%

Calcium levels and calcium: available phosphorus ratios in diets for white egg layers from 42 to 58 weeks of age

et al. 2012

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-The experiment was conducted to determine the nutritional requirement of calcium and the best calcium: available phosphorus ratio for commercial layers at the post-laying peak. A total of 324 Hy-Line W-36 laying hens were utilized in the period from 42 to 58 weeks of age, distributed in a completely randomized design in a 3 × 3 factorial arrangement, composed of three levels of calcium (39, 42 and 45 g/kg) and three calcium:phosphorus ratios (12.12:1; 10.53:1; and 9.30:1), totaling nine treatments with six replications and six birds per experimental unit. There was no significant effect from the calcium levels × calcium:phosphorus ratio interaction for any of the variables studied. The calcium levels and the calcium: phosphorus ratios did not affect the variables performance or egg and bone quality. At the evaluation of the calcium:phosphorus balance, as the levels of calcium of the diet were raised, the intake of calcium and phosphorus and the contents of mineral matter and calcium in the excreta increased linearly, and the retention of calcium by birds decreased linearly. With the reduction of the calcium:phosphorus ratios of the diet, intake, retention and excretion of phosphorus by layers increased. Diets containing calcium at 39 g/kg and a calcium:phosphorus ratio of 12.12:1, corresponding to an increase in calcium of 3.51 g/bird/day and available phosphorus of 289 mg/bird/day, meet the requirements of calcium and available phosphorus of white egg layers in the period from 42 to 58 weeks of age.

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Section: Resultssupporting

confidence: 80%

Calcium levels and calcium: available phosphorus ratios in diets for white egg layers from 42 to 58 weeks of age

et al. 2012

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“…Similarly, Cufadar et al (2011) found no differences in egg production, egg weight, egg mass, feed intake and feed conversion ratio when moulted layers were fed diets with 3.0, 3.6 or 4.2 % of Ca. Pelicia et al (2009) reported that increasing dietary levels of Ca (3.00-4.50 %) did not influence laying performance in hens at the end of the production cycle (58 to 70 weeks of age). In contrast, Saafa et al (2008) showed that, late in the production cycle (58 to 73 weeks of age), hens require more than 3.5 % of Ca in the diet for optimal laying performance, since an increase in Ca dietary levels to 4.0 % improved egg production, egg mass and the feed conversion ratio.…”

Section: Laying Performancementioning

confidence: 97%

Effects on performance and eggshell quality of particle size of calcium sources in laying hens' diets with different Ca concentrations

et al. 2015

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Abstract. The objective of this study was to evaluate the effect of particle size of a dietary Ca source on egg production and eggshell quality when added to hens' diets that have different levels of calcium. The experiment was carried out on 216 ISA Brown hens (25 to 70 weeks of age), allocated to 9 groups of 12 replicates (cages), with two birds in each cage. A 3 × 3 factorial arrangement was used, with three dietary levels of calcium (3.20, 3.70 and 4.20 %) and three levels of dietary substitutions (0, 25 and 50 %) of fine particles of limestone (FPL, diameter 0.2-0.6 mm) with large particles of limestone (LPL, diameter 1.0-1.4 mm) as a Ca source.The level of Ca in the diet had no effect on egg production, mean egg weight, feed intake, feed conversion ratio or eggshell quality parameters (P >0.05). Substitution of FPL with LPL did not affect laying performance indices or eggshell quality at 30, 43 and 53 weeks of age (P >0.05); however, it increased (P <0.05) eggshell percentage, thickness, density and breaking strength in older hens (69 weeks of age). In conclusion, the results of this study demonstrated that a level of 3.20 % Ca in a layer's diet is sufficient through the entire laying cycle to maintain good egg production and eggshell quality and that partial (25 or 50 %) substitution of fine-with large-particle limestone can, irrespective of the level of Ca in the diet, improve eggshell quality in aged laying hens.

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“…its utilization (Pizzolante et al, 2009). Other studies showed that large particle sizes have no effect on shell quality, even when calcium levels in the diet are adequate (Pelicia et al, 2009;Pizzolante et al, 2009;Saunders-Blade et al, 2009). Frequently, the results of research show that artificial lighting programs influence egg production, but not egg quality parameters (Jácome et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Limestone particle sizes and lighting regimens on egg and bone quality of laying hens

Xavier

Freitas

Braz

et al. 2015

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effect of limestone particle sizes in the diet and of lighting regimes on the egg and bone quality and on the performance of commercial laying hens. Three hundred Hissex White layers, at 18 weeks of age, were distributed in a completely randomized design, in a 5×2 factorial arrangement (coarse limestone in the diet at 0, 25, 50, 75, and 100%; with or without artificial light), with five replicates of six birds. No significant interaction was observed between particle sizes and lighting regime for the evaluated parameters. There was no significant effect of coarse limestone level in the diet on the performance and egg quality of hens; however, bone deformity (3.23 to 4.01 mm), strength (5.19 to 6.70 kgf cm -2 ), and mineral matter (51.09 to 59.61%) improved as the proportion of coarse limestone increased. For lighting regime, the treatment with artificial light yielded higher Haugh unit values (87.17 vs. 85.54) than that with natural light only. Greater limestone particles improve bone quality of laying hens, and the use of artificial light can benefit the albumen quality of the eggs.Index terms: egg mass, shell thickness, specific gravity, tibia. Tamanhos de partícula de calcário e regimes de luz na qualidade de ovos e ossos de galinhas poedeirasResumo -O objetivo deste trabalho foi avaliar os efeitos de tamanhos de partículas de calcário na dieta e de regimes de luz artificial sobre a qualidade de ovos e de ossos e o desempenho de galinhas poedeiras comerciais. Utilizaram-se 300 poedeiras Hissex White, com 18 semanas de idade, distribuídas em delineamento inteiramente casualizado, em arranjo fatorial 5x2 (tratamentos com calcário grosso na dieta a 0, 25, 50, 75 e 100%; com ou sem luz artificial), com cinco repetições de seis aves. Não se observou interação significativa entre o tamanho das partículas e a iluminação quanto aos parâmetros avaliados. Não houve efeito significativo da percentagem de calcário grosso na ração sobre o desempenho e a qualidade do ovo das galinhas; no entanto, a deformidade (3,23 a 4,01 mm), a resistência à quebra (5,19 a 6,70 kgf cm -2 ) e a matéria mineral dos ossos (51,09 a 59,61%) melhoraram com o aumento da proporção de calcário grosso. Quanto ao regime de iluminação, o tratamento com luz artificial apresentou maiores valores de unidade Haugh (87,17 vs. 85,54) do que aquele apenas com luz natural. As maiores partículas de calcário melhoram a qualidade óssea das galinhas poedeiras, e a utilização da luz artificial pode favorecer a qualidade do albúmen dos ovos.Termos para indexação: massa de ovo, espessura de casca, densidade específica, tíbia.

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Calcium levels and limestone particle size in the diet of commercial layers at the end of the first production cycle

Cited by 32 publications

References 16 publications

Calcium levels and calcium: available phosphorus ratios in diets for white egg layers from 42 to 58 weeks of age

Calcium levels and calcium: available phosphorus ratios in diets for white egg layers from 42 to 58 weeks of age

Effects on performance and eggshell quality of particle size of calcium sources in laying hens' diets with different Ca concentrations

Limestone particle sizes and lighting regimens on egg and bone quality of laying hens

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