Percent Shell and Plasma Mineral Concentrations in Three Strains of Domestic Fowl Selected for Thick or Thin Egg Shell Production

Wideman, Robert F.; Buss, E. G.

doi:10.3382/ps.0640388

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…Wideman and Buss (1985) showed that genetic selection for thick or thin egg shell production resulted in higher plasma calcium level in thick shell-producing hens than in thin shell-producing hens; this is confirmed by the results of the present study. Hodges (1969) demonstrated that plasma calcium level fell at 12 to 18 h postoviposition and began to recover at 19 h for the next oviposition.…”

Section: Resultssupporting

confidence: 93%

Adenosine Triphosphatase in the Uterus and Duodenum of Chicken Hens During Eggshell Formation

et al. 1989

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Plasma calcium concentration and uterine and duodenal adenosine triphosphatase (ATPase) activities were determined during shell formation for high (H) and low (L) shell strength lines of hens selected from the last of four consecutive generations. The H and L lines were divided into three groups according to shell formation at 0, 15, and 22 h following oviposition. Plasma total calcium was determined from blood samples collected from the common carotid artery. Activity of ATPase was determined in uterine and duodenal mucosa. Shell strength, shell weight, percentage of shell per egg and shell thickness of the H line hens significantly exceeded those of the L line. During shell formation, no significant fluctuation in plasma calcium levels was observed within a line, but overall mean plasma calcium concentrations were higher in the H line than L line. Uterine ATPase activity increased with time after oviposition in both lines, with that of the H line being greater. Duodenal ATPase activity of H line hens remained fairly constant throughout the period, but this value showed fluctuations in the L line hens. It thus appears that laying hens with high and low shell strength may vary in their ability to use calcium for shell formation.

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Section: Resultssupporting

confidence: 93%

Adenosine Triphosphatase in the Uterus and Duodenum of Chicken Hens During Eggshell Formation

et al. 1989

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“…Significant positive correlation coefficients (0.55 to 0.65) were found between plasma calcium and inorganic phosphorus levels at each age tested from 20 to 50 wks. Similar results were reported by Wideman and Buss (1985) with Leghorn hens. This high positive correlation may be due to close coordination of these two variables in the metabolism.…”

Section: Resultssupporting

confidence: 91%

“…Chen and Shen (1989) also reported that the ducks retained more calcium from feed than Leghorn hens, and the calcium content in the duck eggshells was significantly higher than those of hens. As for inorganic phosphorus level, Wideman and Buss (1985) indicated that the range of plasma inorganic phosphorus from blood collected between 2.5 and 4.0 h postoviposition at 35 wks of age in different lines of laying hens was 5.8 to 7.6 mg/dl. Our results were higher than those obtained by Wideman and Buss (1985).…”

Section: Resultsmentioning

confidence: 99%

“…As for inorganic phosphorus level, Wideman and Buss (1985) indicated that the range of plasma inorganic phosphorus from blood collected between 2.5 and 4.0 h postoviposition at 35 wks of age in different lines of laying hens was 5.8 to 7.6 mg/dl. Our results were higher than those obtained by Wideman and Buss (1985). This might be due to differences in blood collection time and species.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Age and Lines on Blood Parameters in Laying Tsaiya Ducks

Lee¹,

Shen²,

Jiang³

2004

Asian Australas. J. Anim. Sci

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Three hundred and twelve female Tsaiya ducks from four lines (L1051, L1052, L1053 and L1054) were used in this study to investigate the changes in plasma calcium and inorganic phosphorus levels, blood pH, carbon dioxide partial pressure (pCO 2 ), bicarbonate ion concentration ([HCO 3 -]), and base excess (BE) during laying periods. The results indicated that plasma calcium and inorganic phosphorus concentration at 40 and 50 wks of age were higher (p<0.05) than those at other ages. Significant positive correlation coefficients were found between plasma calcium and inorganic phosphorus levels at each age tested from 20 to 50 wks. Ducks from L1053 showed lower (p<0.05) blood pH, BE and [HCO 3 -] as compared with other lines. Ducks from L1054 had higher (p<0.05) blood pH, BE and [HCO 3 -] than those of other lines showing that there were some differences on blood parameters among lines. Eggshell strength decreased with age up to 65 wks and remained constant thereafter. Egg weight increased gradually from 30 to 60 wks and decreased slightly after 70 wks of age. Plasma inorganic phosphorus level in 40 and 50 wks old birds was positively correlated with eggshell strength, while blood [HCO 3 -] in 40 and 50 wks old birds was negatively correlated with eggshell strength. (Asian-Aust. J.

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“…For example, although Wideman and Buss (1985) used %S directly in a large breeding experiment, it would have been easier for them to measure SG and then use an equation such as that of Hunt (1963) to predict %S. To examine the merits of this approach, the regression equation from the first naked oats experiment was used to predict %S in some of the other experiments.…”

Section: ^The Percentage Of Overall Variance Accounted For By the Prementioning

confidence: 99%

Prediction of Shell Percentage Using Inverse Specific Gravity: Some Problems in Deriving an Equation and in Its Application

Thompson¹,

Hamilton²

1989

Poultry Science

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The egg data from six studies published earlier were re-examined to consider the merits of prediction equations derived from one data set in estimating parameters from another. Of particular interest was an equation suggested by Hunt (1963), which predicted shell percentage on the basis of the inverse of specific gravity. All data used here were obtained from eggs of White Leghorn hens. Five of the studies were conducted at the Animal Research Centre; the sixth involved eggs obtained from a commercial egg grading station. Data sets ranged in size from 228 to 5,736 observations. In each case, a regression equation was derived from the entire data set; in several cases, equations were also determined for subsets.Both the slopes of the regression line and the correlations were found to vary considerably among data sets (slopes from -65 to -146 and correlations from -.53 to -.92). Much of the variation could be attributed to several factors, including date of sampling, duration of storage, integrity of the shell, age, and strain of bird. When these factors had been taken into account, reasonably consistent estimates were generally obtained. However, with one data set, it was impossible to obtain meaningful estimates because these factors had not been controlled. It is apparent from these results that prediction equations derived under a particular set of circumstances are not generally transferable to other data sets. (

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Percent Shell and Plasma Mineral Concentrations in Three Strains of Domestic Fowl Selected for Thick or Thin Egg Shell Production

Cited by 5 publications

References 17 publications

Adenosine Triphosphatase in the Uterus and Duodenum of Chicken Hens During Eggshell Formation

Adenosine Triphosphatase in the Uterus and Duodenum of Chicken Hens During Eggshell Formation

Effects of Age and Lines on Blood Parameters in Laying Tsaiya Ducks

Prediction of Shell Percentage Using Inverse Specific Gravity: Some Problems in Deriving an Equation and in Its Application

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