The Iodine Content of Hens' Eggs as Affected by the Ration

Wilder, O. H. M.; Bethke, R. M.; Record, P. R.

doi:10.1093/jn/6.4.407

Cited by 14 publications

(4 citation statements)

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“…The rate of deposition and peak values also seem to be dependant upon dietary I concentration (Marcilese et al 1968). In contrast to the effects of excess I on egg production, body weight and feed intake, Table 1 shows that significant depositions in the yolk can occur at relatively moderate excesses of dietary I (Wilder et al 1933;Asmundson et al 1936;Kan et al 1995;Yue & Kang, 1995;Rys et al 1997;Kaufmann et al 1998;Kroupova et al 1998Kroupova et al , 1999Cao et al 1999;Travnicek et al 1999;Yang et al 2001). The optimum dietary I concentration required to produce an I-enriched egg will obviously depend on the definition of, and the reason for, I enhancement.…”

Section: Yolk Iodinementioning

confidence: 94%

“…Data for comparisons of seaweed with dietary Ca(IO 3 ) 2 (Perry et al 1989) and KIO 3 (Kaufmann et al 1998) suggest that the responses of laying hens to these three sources are similar. In addition, Wilder et al (1933) did not believe that there were any differences among kelp, iodinised linseed and KI in their efficiency of I transfer into the yolk. Ishikawa & Kamimae (1980), however, claimed that when diets containing .…”

Section: Source Of Iodinementioning

confidence: 95%

“…Indeed, Marcilese et al (1968) suggested that this concentration (about 110 mg I/kg) might be the threshold of follicular I content beyond which development stops and atresia begins. However, the amount of egg-I declines equally rapidly when birds are returned to normal feed (Wilder et al 1933;Marcilese et al 1968). When excess-I diets are fed for extended periods (.…”

Section: Yolk Iodinementioning

confidence: 99%

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Responses of domestic fowl to excess iodine: a review

2004

Br J Nutr

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Typically, poultry diets contain 1–2 mg I/kg, but higher concentrations are sometimes used to enhance the I content of eggs. In addition to an increased deposition of I in the yolk, other often adverse responses occur, especially at exceptionally high concentrations. Excess I in grower diets can prevent sexual maturation in male and female fowl, and in layer diets will progressively reduce egg production until, by about 2500 mg I/kg diet, ovulation is inhibited and egg production ceases. Most I accumulates in the thyroid gland, and it is likely that the mechanism responsible for these reproductive disorders involves a modification of thyroid hormone activity. Simultaneous with the declining rate of lay, feed intake declines, egg weight and yolk-cholesterol contents decrease and body weight increases. Whereas fertility is unaffected in female breeders, hatch of fertile eggs is reduced, hatch time extended and embryonic mortality and dead-in-shell proportions increased. In contrast, male fertility is decreased because of an increased incidence of dead spermatozoa, although hatchability of eggs from normally fed hens is unaffected. All reproductive variables, together with feed intake and body weight, are normalised within about 7 d of returning to a diet with normal I levels. Excess I suppresses growth in meat-type chickens, but does not affect feed conversion efficiency. There are transient increases in plasma I and cholesterol concentration during excess I intake in all types of bird. The evidence for varying responses to different I sources is equivocal, but the consensus is that source is probably not important.

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Section: Yolk Iodinementioning

confidence: 94%

Section: Source Of Iodinementioning

confidence: 95%

Section: Yolk Iodinementioning

confidence: 99%

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Responses of domestic fowl to excess iodine: a review

2004

Br J Nutr

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“…The duration of these trials were adequate to test the effect of supplementary iodine on egg size and quality because the supplement goes very quickly and practically entirely into the eggs (Simpson and Strand, 1930;Jaschik and Kieselbach, 1931;Scharrer and Schropp, 1932;Wilder, Bethke and Record, 1933). The duration of these trials were adequate to test the effect of supplementary iodine on egg size and quality because the supplement goes very quickly and practically entirely into the eggs (Simpson and Strand, 1930;Jaschik and Kieselbach, 1931;Scharrer and Schropp, 1932;Wilder, Bethke and Record, 1933).…”

Section: Resultsmentioning

confidence: 99%