The Effect of Experimental 17-beta Estradiol Administering on Calcium Metabolism Regulation in Young Laying Hens

Dojana, N.; Cotor, G.; Codreanu, I.; Balaceanu, Rosalie

doi:10.15835/buasvmcn-vm:10854

Cited by 2 publications

(3 citation statements)

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“…Ca level seems to be very easily influenced by a number of factors. Apart from the level of Ca intake, described in our experiments, they were reported influences on the blood plasma Ca according to the breed, in Cornish vs. Plymouty Rock (Preda et al, 2013), vitamin D status (Dojană et al, 2014) or hormonal status (Dojană et al, 2015). Pelicia et al (2009) reported significant increases (P < 0.05) of the level of plasma Ca in hens during the second laying cycle (90-wk.-old hens) fed on diets containing 3.0-3.5-4.0 and, respectively, 4.5%…”

Section: Resultsmentioning

confidence: 61%

“…Also, excessive Ca intake in the diet, besides being useless, can bring disadvantages by altering the level of other components of the diet. Ca diet alterations fall into a rapid change of the hen health status and the quality of the egg shell, so that a dietary content/requirement imbalance has immediate and high negative economic consequences (Hurwitz, 1009;Preda et al, 2013;Dojană et al, 2015). Layers are quite sensitive to changes in Ca intake / export balance.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Different Dietary Calcium Levels on Calcium Metabolism in Laying Hens

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Bărbuceanu

Dojana

et al. 2018

“Agriculture for Life, Life for Agriculture” Conference Proceedings

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The experiment was carried out on four groups of Hy-Line var. Brown hens (n = 350 each) fed on diets which provided 2.49, 3.07, 3.78 and, respectively, 4.15 g% calcium (Ca) during the laying period. Consequently, mean daily Ca intake was 2.74, 3.38, 4.16 and 4.60 g/cap., respectively. Ca metabolism was assayed at 20 weeks of age (start of the laying), 36 weeks of age (the peak of the laying) and 68 weeks (the end of the laying period). A significant part of the ingested Ca was not absorbed. The percentage of Ca exonerated by feces was higher at the start of the laying and lowers in the peak of laying and at the end of the laying period. The amount of Ca exonerated as unabsorbed Ca increases as the amount of ingested Ca increases inside of each age level. It was found also an increase of the Ca content of the egg shell according the Ca intake statistically significant (P<0.05) in 36- and 68-wk.-old hens, but not in 20-wk.-old hens. Blood plasma Ca showed significantly higher values in 3.38-, 4.16- and 4.60-g/day-Ca-intake groups when compared by 2.74-g/day-Ca-intake group (P < 0.05) but the level of increasing showed lowest values in hen groups with highest intake of Ca. The daily eggshell Ca export strongly correlates with the amount of daily Ca intake in 36-wk.-old hens and 68-wk.-old hens: r = +0.72 and +0.84, respectively, but no correlation was found in 20-wk.-old hens (r = -0.74, negative correlation). The results showed a limited physiologic capacity of the Ca absorption in hen, the Ca surplus being lost. Dietary Ca level should be closely correlated with the laying level of hens.

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Section: Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

The Effect of Different Dietary Calcium Levels on Calcium Metabolism in Laying Hens

Negoiță

Bărbuceanu

Dojana

et al. 2018

“Agriculture for Life, Life for Agriculture” Conference Proceedings

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“…Estradiol-17ß can also counteract the reduction of bone strength and loss of structural bone as a consequence of increased egg production (Whitehead and Fleming, 2000). The medullary bone, which presents a calcium reservoir for egg shell building, is formed at the onset of egg laying (Senior, 1974;Johnson, 2000;Whitehead and Fleming, 2000;Dojana et al, 2015). The key role of Estradiol-17ß in the modelling of the medullary bone is well described (e.g., Hiyama et al, 2012;Squire et al, 2017;Eusemann et al, 2022) Thus, our results may support the relationship between estradiol-17ß and bone health.…”

Section: Discussionmentioning

confidence: 99%

Estradiol-17ß Is Influenced by Age, Housing System, and Laying Performance in Genetically Divergent Laying Hens (Gallus gallus f.d.)

et al. 2022

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The estrogen estradiol-17ß is known as one of the major gonadal steroid hormones with different functions in reproduction. In this study we analyzed estradiol-17ß concentration in laying hens of four pure bred chicken laying lines at four different time intervals of the laying period (17th–19th week of age, 33rd–35th week of age, 49th–51st week of age, and 72nd week of age). The high performing white egg (WLA) and brown egg (BLA) layer lines as well as the low performing white (R11) and brown (L68) layer lines were kept in both single cages and a floor housing system. We investigated whether there were differences in estradiol -17ß concentrations between lines at different ages that could be related to selection for high egg production or phylogenetic origin of the animals, and whether there was an influence of housing conditions on estradiol-17ß. Estradiol-17ß concentrations differed between high and low performing layer lines at all time intervals studied. High performing hens showed higher estradiol-17ß concentrations compared to low performing hens. In all lines, highest estradiol-17ß concentration was measured at their 49th to their 51st week of age, whereas the peak of laying intensity was observed at their 33rd to their 35th week of age. Additionally, hens with fewer opportunities for activity housed in cages showed higher estradiol-17ß concentrations than hens kept in a floor housing system with more movement possibilities. We could show that laying performance is strongly linked with estradiol -17ß concentration. This concentration changes during laying period and is also influenced by the housing system.

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The Effect of Experimental 17-beta Estradiol Administering on Calcium Metabolism Regulation in Young Laying Hens

Cited by 2 publications

References 3 publications

The Effect of Different Dietary Calcium Levels on Calcium Metabolism in Laying Hens

The Effect of Different Dietary Calcium Levels on Calcium Metabolism in Laying Hens

Estradiol-17ß Is Influenced by Age, Housing System, and Laying Performance in Genetically Divergent Laying Hens (Gallus gallus f.d.)

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