Choline Requirement and Synthesis in Laying Hens

Crawford, J. S.; Griffith, M.; Teekell, R. A.; Watts, A. B.

doi:10.3382/ps.0480620

Cited by 18 publications

(9 citation statements)

References 14 publications

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“…The increased LLC in extra heavy layers confirms the reports of several workers who have found that low levels of dietary choline in laying hens are correlated with increased LLC (Crawford et al, 1969;Griffith et al, 1969;Nesheim et al, 1971;March, 1981). However, egg production was not correlated with LLC.…”

Section: Resultssupporting

confidence: 93%

“…The biosynthesis of a considerable amount of choline appears to occur in the laying hen as indicated in several studies (Lucas et al, 1946;Ringrose and Davis, 1946;Crawford et al, 1969;Nesheim et al, 1971). Although it was concluded in some of these studies that little or no supplemental choline was necessary for optimum egg production when natural ingredients were used, results from other experiments have shown that choline is a dietary essential for the laying hen.…”

Section: Introductionmentioning

confidence: 93%

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Choline Supplementation in the Diets of Aged White Leghorn Hens Grouped According to Body Weight

et al. 1983

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A randomized block design experiment was conducted to determine if aged layers require supplemental choline when fed practical corn-soy diets adequate in methionine. Hisex hens (50 weeks old) were divided into four body weight groups containing 120 hens each. Six experimental treatments were prepared by addition of choline to a corn-soy basal diet at 0, 55, 110, 220, 440, and 880 mg/kg of diet. Each diet was fed to four replicates of 5 hens each within each body weight group. The nutrient content in the basal diet formulated for each body weight group was adjusted depending on daily feed intake. The experiment was conducted for four 28-day periods (January 21 to May 13). Hen-day egg production, feed conversion, egg specific gravity, and egg weight did not differ significantly for any level of choline supplementation. Liver lipid content was significantly different at no supplemental choline in extra heavy birds. Results of this experiment support the conclusion that, regardless of body weight, aged laying hens required very little, if any, supplemental choline when they are fed a corn-soy practical diet containing adequate methionine.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 93%

Choline Supplementation in the Diets of Aged White Leghorn Hens Grouped According to Body Weight

et al. 1983

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“…The failure of birds receiving the choline supplement to deposit appreciably more choline in their eggs is in agreement with Crawford et al (1969), who reported that increasing the dietary choline level to as high as 5700 mg/kg had no apparent effect on yolk choline content.…”

Section: Resultssupporting

confidence: 83%

Trimethylamine Production in the Caeca and Small Intestine as a Cause of Fishy Taints in Eggs

March

Macmillan

1979

Poultry Science

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The caeca and small intestine of chickens consistently contain trimethylamine (TMA). The caecal contents in the birds studied ranged from 4 to 55 Mg TMA/g and contained the higher concentrations when the diet contained rapeseed meal or supplementary choline. The amounts of TMA in the small intestine were lower (1 to 21 jug/g) and were less influenced by dietary composition. Supplementary choline in the diet of laying birds induced the production of tainted eggs by some birds. The yolks of tainted eggs contained concentrations of TMA which were consistent for each bird. TMA was also present in the follicular yolks of all sizes in the ovaries of birds which laid tainted eggs. It is postulated that, in birds laying tainted eggs, failure of the liver to oxidize TMA is responsible for deposition of TMA in egg yolk.

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“…Yumurta t(lvuklarının önemli miktarlarda kalİn sentezledikleri bilinmektedir (5,9). Bazı ar<ıştırıcılar (5,8,9), bu biyosentezin hayvanın tüm kolin \"(~metil grupları ihtiyacını tam olarak karşılayabil-diğini belirtirlerken, bazıları da (10, 14, 18) karşılayamadığını da kaydetmektedicler.…”

Section: Introductionunclassified

“…Bazı ar<ıştırıcılar (5,8,9), bu biyosentezin hayvanın tüm kolin \"(~metil grupları ihtiyacını tam olarak karşılayabil-diğini belirtirlerken, bazıları da (10, 14, 18) karşılayamadığını da kaydetmektedicler. Araştırmalardaki son uçların farklı olması, tavuğun canlı ağırlığı, \'('rimi.…”

Section: Introductionunclassified

YUMURTA TAVUGU RASYONLARINA KATıLAN BETAİNİN YUMURTA VERİMİ VE YUMURTA KALİTESİ ÜZERİNE ETKİLERİ

Sakine;ERGÜN

1992

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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Choline Requirement and Synthesis in Laying Hens

Cited by 18 publications

References 14 publications

Choline Supplementation in the Diets of Aged White Leghorn Hens Grouped According to Body Weight

Choline Supplementation in the Diets of Aged White Leghorn Hens Grouped According to Body Weight

Trimethylamine Production in the Caeca and Small Intestine as a Cause of Fishy Taints in Eggs

YUMURTA TAVUGU RASYONLARINA KATıLAN BETAİNİN YUMURTA VERİMİ VE YUMURTA KALİTESİ ÜZERİNE ETKİLERİ

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