Effects of ascorbic acid on plasma thyroxine concentrations and eggshell quality of leghorn chickens treated with dietary thiouracil

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 de...

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Bibliographic Details
Published in:Poultry science 1992-03, Vol.71 (3), p.553-559
Main Authors: Peebles, E.D. (Mississippi State University, Mississippi State, MS), Miller, E.H, Brake, J.D, Schultz, C.D
Format: Article
Language:English
Subjects:
ACIDE ASCORBIQUE
ACIDO ASCORBICO
Animals
Ascorbic Acid - pharmacology
Body Weight - drug effects
CALIDAD
CASCARA DE HUEVO
Chickens - blood
Chickens - physiology
COQUILLE D'OEUF
Egg Shell - anatomy & histology
Egg Shell - physiology
Eggs - standards
Female
FONCTION PHYSIOLOGIQUE
FUNCION FISIOLOGICA
GLANDULA TIROIDE
HUEVOS
OEUF
Organ Size - drug effects
Oviposition - drug effects
PESO
PLASMA SANGUIN
PLASMA SANGUINEO
POIDS
POLLO
POULET
PRODUCCION DE HUEVOS
PRODUCTION D'OEUFS
QUALITE
Thiouracil - administration & dosage
THIOURACILE
Thyroid Gland - drug effects
Thyroid Gland - physiology
THYROIDE
THYROXINE
Thyroxine - blood
TIOURACIL
TIROXINA
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Summary: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 0.1% 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 0.1% 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 0.1% TU on body weight, egg production, or egg weight of SCWL hens
ISSN:0032-5791
1525-3171
DOI:10.3382/ps.0710553