The Changes in Egg Quality Resulting from Force Molting White Leghorn Yearling Hens

Berg, Lawrence R.; Bearse, Gordon E.

doi:10.3382/ps.0260414

Poultry Science

1947

DOI: 10.3382/ps.0260414

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The Changes in Egg Quality Resulting from Force Molting White Leghorn Yearling Hens

Lawrence R. Berg¹,

Gordon E. Bearse²

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Cited by 23 publications

(17 citation statements)

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“…Len et al (1964) showed an improvement in shell thickness and Haugh scores of eggs laid in the postmolt period, however, the improvement was only temporary. These findings are in agreement with the earlier work of Berg and Bearse (1947). Other workers, Marble (1963) and Snyder and Orr (1960), have also observed an improvement in shell and interior quality.…”

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confidence: 93%

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Subsequent Production and Egg Quality of Forced Molted Hens

Noles

1966

Poultry Science

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supporting

confidence: 93%

“…The extent of the improvement in shell and interior quality has been associated with the length of the cessation of lay (Hansen, 1960). However, changes in egg quality as a result of molting have not been consistent in all trials (Berg and Bearse, 1947). Finally, the improved feed efficiency obtained in some trials, e.g.…”

mentioning

confidence: 97%

Subsequent Production and Egg Quality of Forced Molted Hens

Noles

1966

Poultry Science

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“…One would then expect their albumen quality to be higher when they recommence laying eggs than just before they stopped. Berg and Bearse (1947) found that birds which had been force-molted laid eggs of higher albumen quality afterwards if they had been laying for 12 months, but this effect was not observed for birds in lay for only 10 months.The present study has sought to test the exhaustion hypothesis. This was done in two ways.…”

mentioning

confidence: 62%

Changes in Albumen Quality with Time

Wilcox

Wilson

1962

Poultry Science

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N UMEROUS reports indicate that albumen quality declines more or less steadily throughout the first laying year (Sauter et al., 1954;Strain and Johnson, 1957;Froning and Funk, 1958;May and Stadelman, 1960;Mueller et al, 1960). The consensus of opinion is that this change is not related to seasonal changes in temperature. Convincing evidence has been advanced that the decline is primarily a consequence of increasing age of the bird (Cunningham et al., 1960).There is, however, an additional explanation for the decline in albumen quality. This is that an exhaustion phenomenon is involved, and that within a given laying year or season the bird lays eggs which are successively poorer in quality because of her inability to cope with the high demands of continuous production of eggs. The change in albumen quality expected on the basis of this explanation would be precisely that expected on the basis if an explanation of aging, at least during the first laying year when birds are in more or less continuous production.One difficulty in ascribing aging as the primary cause of declining albumen quality is that all studies have confined themselves to the first two laying years. Data for many more laying years beyond these would be necessary to clearly establish an effect of aging.If an effect of exhaustion or wearing out is involved, one would expect that the eggs of high producers should show a greater decline in albumen quality during the first 1 Scientific Article No. A936, Contribution No. 3293 of the Maryland Agricultural Experiment Station, Department of Poultry Husbandry.laying year than those of low producers. This may indeed be the case, since Johnson and Merritt (1955) found, at least in White Leghorns, that eggs of higher producers tended to have lower albumen height at the end of the laying year. A second thing one would expect if exhaustion is involved is that if healthy birds stop laying eggs for a sufficiently long period, they will replenish their bodily reserves. One would then expect their albumen quality to be higher when they recommence laying eggs than just before they stopped. Berg and Bearse (1947) found that birds which had been force-molted laid eggs of higher albumen quality afterwards if they had been laying for 12 months, but this effect was not observed for birds in lay for only 10 months.The present study has sought to test the exhaustion hypothesis. This was done in two ways. One was by stopping egg production during the first laying year using progesterone, and observing the effect on albumen quality. The other way was by observing the effect of the length of stoppage of egg production between the first and second laying years (henceforth termed "pause") on the albumen quality of eggs laid at the start of the second laying year. EXPERIMENTAL PROCEDUREIn the experiment with progesterone, 115 random bred White Leghorns (King et al., 1959) hatched in April of 1959 were distributed in approximately equal numbers into two pens. In February one of the pens received an intramuscular injection of 0.5 ...

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“…Their data indicated a decrease in shell thickness during spring and summer months. Berg and Bearse (1947) studied the effect of force molting of the hens on the quality and production of eggs. After the molting period, the hens laid eggs with an average albumen index of 91 as compared with 71 before molt.…”

mentioning

confidence: 99%

Seasonal Variations in Quality of Eggs as Measured by Physical and Functional Properties

et al. 1954

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The Changes in Egg Quality Resulting from Force Molting White Leghorn Yearling Hens

Cited by 23 publications

References 3 publications

Subsequent Production and Egg Quality of Forced Molted Hens

Subsequent Production and Egg Quality of Forced Molted Hens

Changes in Albumen Quality with Time

Seasonal Variations in Quality of Eggs as Measured by Physical and Functional Properties

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