Níveis de cálcio e granulometrias do calcário para frangas e seus efeitos sobre a produção e qualidade de ovos

Geraldo, Adriano; Bertechini, Antônio Gilberto; Kato, Reinaldo Kanji; Brito, Jerônimo Ávito Gonçalves de; Fassani, Édison José

doi:10.1590/s1516-35982006000600020

Cited by 11 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No significant effects (P>0.05) of calcium levels and limestone particle size or their interaction (calcium × size) were observed on the digestive tract proportion to the body weight of laying hens during production stage ( Table 7). The result is consistent with the findings of Geraldo et al (2006), who noted no significant effect of calcium and limestone texture on the digestive tract percentage of laying hens.…”

Section: Resultssupporting

confidence: 92%

“…However, there was no significant effect (P>0.05) of limestone particle size, which contradicts, in part, the results described by Geraldo et al (2006), who found a positive residual effect of fine granulometry in phases of rearing and re-rearing of hens on the average egg production at the production stage. There was no effect (P>0.05) of calcium levels and particle size of limestone on the egg weight.…”

Section: Resultscontrasting

confidence: 84%

“…The interaction calcium levels × limestone particle size had no effect (P<0.01) on this variable when it was used 4.12% calcium associated with coarse limestone (1.00 mm; Table 6), and this indicates that the limestone fine texture affects the intestinal length. Geraldo et al (2006) found no significant effect of calcium levels or limestone particle size on the small intestine length. However, the use of limestone with coarse texture result in a larger quantity of this ingredient retained in the gut of birds (Bertechini, 2006), which explains the longer length of this part of the intestine of birds.…”

Section: Resultsmentioning

confidence: 65%

“…There was no effect (P>0.05) of calcium levels and particle size of limestone on the egg weight. Geraldo et al (2006), studying calcium levels and particle sizes of limestone for hens and their effects on yield and quality of eggs, also found no difference in egg weight among groups, then the calcium level and particle size of limestone used did not affect the egg weight.…”

Section: Resultsmentioning

confidence: 91%

“…The great genetic development of laying hens in recent years has changed important physiological aspects in these birds, requiring further research to equate them (Geraldo, 2006). In this context, the development of body and digestive tract of these birds have been object of concern, with problems related to uniformity of flocks and digestibility of nutrients, affecting their productivity.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of the levels of calcium and particle size of limestone on laying hens

et al. 2011

View full text Add to dashboard Cite

-This experiment was conducted to evaluate the effect of levels of calcium (Ca) and particle size of limestone (LS) for laying hens. It was used 216 Dekalb White laying hens at 25 to 49 weeks of age in a completely randomized design in a 3 × 2 factorial arrangement, composed of three levels of calcium (3.92, 4.02 and 4.12%) and two particle sizes of limestone (thin -0.60 mm; and thick -1.00 mm), resulting in 6 treatments with six replicates of six birds. There was no significant effect of levels of calcium and limestone particle size neither of the interaction calcium × particle size for feed intake, egg weight, specific gravity, shell thickness, shell percentage, Haugh unit, calcium and phosphorus digestibility and percentage of digestive tract. Production, mass, conversion by mass and conversion by egg dozen had their best results with 4.12% of calcium in the diet. Percentage of gizzard and feed intake observed at 3:00 p.m. improved as limestone granulometry improved from 0.60 to 1.00 mm. There was an interaction effect among calcium level and limestone granulometry for breaking strength of tibia, bone density, length of the small intestine and feed intake at 6:00 a.m.; 9:00 a.m., 12:00 p.m., 6:00 p.m. and 9:00 p.m., respectively. It is recommended the addition of 4.12% of calcium and limestone in the thick granulometry (1.00 mm) for a better performance of commercial laying hens. More studies are needed to elucidate the mechanisms involved in the alteration of nutritional behavior of laying hens in response to changes in the levels of calcium and in the granulometry of limestone in the rations.Key Words: bone strength, egg quality, performance Efeito dos níveis de cálcio e da granulometria do calcário para poedeiras comerciais RESUMO -O experimento foi realizado para avaliar o efeito dos níveis de cálcio (Ca) e da granulometria do calcário (GC) para poedeiras comerciais. Foram utilizadas 216 poedeiras da linhagem Dekalb White de 25 a 49 semanas de idade em um delineamento inteiramente casualizado, em esquema fatorial 3 × 2, composto de três níveis de cálcio (3,92; 4,02 e 4,12%) e duas granulometrias do calcário (fina -0,60 mm; e grossa -1,00 mm), que resultaram em seis tratamentos, com seis repetições de seis aves. Não houve efeito significativo dos níveis de cálcio e da granulometria do calcário nem da interação nível de cálcio × granulometria do calcário para o consumo de ração, o peso dos ovos, a gravidade específica, a espessura da casca, a porcentagem de casca, a unidade Haugh, a digestibilidade de cálcio e fósforo e a porcentagem do trato digestório.A produção, massa, conversão por massa e conversão por dúzia de ovos tiveram seus melhores resultados com 4,12% de cálcio na dieta . A porcentagem de moela e o consumo de ração observado às 15 h melhoraram com o aumento na granulometria do calcário de 0,60 para 1,00 mm. Houve efeito da interação entre nível de cálcio e granulometria do calcário para a resistência à quebra da tíbia, a densidade óssea, o comprimento do intestino delgado e o consumo de...

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultscontrasting

confidence: 84%

Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of the levels of calcium and particle size of limestone on laying hens

et al. 2011

View full text Add to dashboard Cite

show abstract

Growth and egg production of layer pullets can be affected by the method of supplying energy and protein sources

Ocak

Sungu

2009

J Sci Food Agric

View full text Add to dashboard Cite

BACKGROUND: The effects of different methods of offering energy (ES) and protein (PS) sources on growth and egg production of layer pullets were assessed. From 9 to 22 weeks of age, 320 layer chickens (Isa Brown) were allocated to four treatments: 1, control (balanced diet); 2, E60:P40 (ES and PS in balanced diet sequentially during 60 and 40% of daily photoperiod respectively); 3, E40:P60 (ES and PS in balanced diet sequentially during 40 and 60% of daily photoperiod respectively); 4, EPFC (free choice between ES and PS in separate troughs).

show abstract