Influence of Diet-Mediated Maternal Thyroid Alterations on Functional Properties of Turkey Eggs ,

Christensen, V. L.; Ort, J. F.

doi:10.3382/ps.0691576

Cited by 14 publications

(17 citation statements)

References 11 publications

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“…The results presented here are in contrast with those previously reported by Christensen and Ort (1990), who demonstrated increased hatchability of turkey eggs injected with T 3 . Christensen et al (1991), in a later publication, demonstrated a positive, significant effect of thyroid hormones on hatchability.…”

Section: Resultscontrasting

confidence: 99%

Plasma thyroxine and triiodothyronine concentrations in growing and adult meat type birds fed "00" rapeseed-containing diet during the first seven weeks of life

Swierczewska¹,

Reklewska²,

Siennicka³

1995

J. Anim. Feed Sci.

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In two series of experiments plasma thyroxine and triiodothyronine concentration were examined in 56 adult hens and 139 meat type chickens of Biała Brwinowska strain fed up to 7 weeks of age a diet containing "OO" rape seeds, wheat and barley (diet B) or maize, soyabean meal and wheat (diet C). Relationship between reproductive performance of adult hens and plasma thyroid hormone concentration was assessed.At the age of 7 weeks, chickens fed diet B had significantly lower body weight (except of males in 1994) and, despite of its low (0.7-0.9 /rniol/g) glucosinolate content, significantly higher plasma thyroxine concentration than control birds. No significant diet-related difference was found in their plasma T 3 level and T 3 /T 4 ratio. Also no differences were found in reproductive perfomance of one year old hens related to the diet fed in the first 7 weeks of life. In addition, in both series of experiments plasma T 4 concentration was positively correlated with egg fertility (P ;£ 0.05) while T, negatively to the hatchability rate (P^O.01).

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Section: Resultscontrasting

confidence: 99%

Plasma thyroxine and triiodothyronine concentrations in growing and adult meat type birds fed "00" rapeseed-containing diet during the first seven weeks of life

Swierczewska¹,

Reklewska²,

Siennicka³

1995

J. Anim. Feed Sci.

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“…Dietary iodine treatments (3.5 ppm supplemental iodine or 0 ppm supplemental iodine) were assigned randomly to pens within a strain. The supplemental iodine was added to a basal diet containing .7 ppm iodine as suggested by Christensen and Ort (1990). The supplemental iodine source was potassium iodide.…”

Section: Methodsmentioning

confidence: 99%

“…The National Research Council (1984) recommends .4 ppm dietary iodine for turkey breeders but Christensen and Ort (1990) suggested that .4 ppm of iodine may be insufficient to meet the needs of a turkey hen for reproduction.…”

Section: Introductionmentioning

confidence: 99%

“…Although iodine is an essential nutrient for reproduction in chickens (Wilgus et al, 1953;Arlington et al, 1967) and turkeys (Christensen and Ort, 1990), little information is available to specify the requirement for iodine in the diet of turkey breeder hens. The National Research Council (1984) recommends .4 ppm dietary iodine for turkey breeders but Christensen and Ort (1990) suggested that .4 ppm of iodine may be insufficient to meet the needs of a turkey hen for reproduction.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Dietary Iodine on the Hatchability of Eggs from Two Commercial Strains of Turkeys

1991

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Supplemental dietary iodine (3.5 mg/kg) was fed to two commercial strains [British United Turkeys (B) and Nicholas (N)] of turkey breeder hens. The basal diet contained .7 mg/kg of iodine. Observations were made on hen body weights, feed consumption, hatchability, egg weights, and egg functional characteristics to test the hypothesis that there are differences between commercial strains of turkey breeder hens in the dietary iodine requirement for reproductive success. Supplemental iodine decreased (P less than or equal to .05) functional egg characteristics of both strains. Egg production and hatchability were influenced by an interaction between strains and dietary iodine (P less than or equal to .05). In Strain B hens, egg production and hatchability declined (P less than or equal to .05) when hens were fed supplemental iodine but in Strain N hens no effects on hatchability were observed and egg production increased (P less than .05) with iodine supplementation. The decline in hatchability of eggs from Strain B hens was due to significant (P less than or equal to .05) increases in embryonic mortality during the 1st wk of incubation and during pipping. The treatments resulting in depressed hatchability caused embryos to rely more (P less than or equal to .05) on glycogenolysis than gluconeogenesis during pipping and hatching. The Strain B embryos utilized gluconeogenesis more during pipping (P less than or equal to .05) than Strain N embryos and embryos from Strain B iodine-fed hens had a lower rate of gluconeogenesis than those from hens not fed iodine. It is concluded that there are differences among strains of turkey breeder hens in their dietary iodine requirement for optimal hatchability.

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“…These elements are essential components of avian eggshells. Accordingly, hypothyroidism induced by feeding TU has been found to reduce egg production, egg weight, and various functional eggshell properties (Wentworth and Ringer, 1986;Christensen and Ort, 1989;Miller, 1990).…”

Section: Introductionmentioning

confidence: 98%

Effects of Ascorbic Acid on Plasma Thyroxine Concentrations and Eggshell Quality of Leghorn Chickens Treated with Dietary Thiouracil

Miller

Brake

et al. 1992

Poultry Science

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Because ascorbic acid (AA) and the thyroid hormones are known to influence eggshell formation, the effects of AA on body weight, total plasma thyroxine (T4), egg production, and eggshell quality of Single Comb White Leghorn (SCWL) hens concurrently and previously treated with thiouracil (TU) were determined. Hens were provided feed containing either 0 or 100 ppm AA from 47 to 67 wk of age and either 0 or .1% TU from 47 to 57 wk of age. A three-way split-plot analysis was employed to test for the effects of AA, TU, and time, and their interactions. Dietary TU increased body weight between 53 and 59 wk, and increased thyroid weight at 67 wk; however, TU only depressed plasma T4 level at 51 wk. Dietary TU depressed egg production from 50 to 56 wk and egg weight at 49, 51, and 57 wk. Dietary TU depressed eggshell weight per unit surface area at 49 wk. There was no significant effect due to AA and no AA by TU interaction for any of the parameters examined. It was concluded that .1% dietary TU from 47 to 57 wk of age did not alter eggshell quality and that dietary AA at the 100 ppm level did not influence the effects of .1% TU on body weight, egg production, or egg weight of SCWL hens.

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Influence of Diet-Mediated Maternal Thyroid Alterations on Functional Properties of Turkey Eggs ,

Cited by 14 publications

References 11 publications

Plasma thyroxine and triiodothyronine concentrations in growing and adult meat type birds fed "00" rapeseed-containing diet during the first seven weeks of life

Plasma thyroxine and triiodothyronine concentrations in growing and adult meat type birds fed "00" rapeseed-containing diet during the first seven weeks of life

The Effect of Dietary Iodine on the Hatchability of Eggs from Two Commercial Strains of Turkeys

Effects of Ascorbic Acid on Plasma Thyroxine Concentrations and Eggshell Quality of Leghorn Chickens Treated with Dietary Thiouracil

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