Effect of 1 alpha,25-dihydroxycholecalciferol on egg shell quality and egg production
| Autor: | J. H. Soares, A. A. Grunder, Roberto M. Narbaitz, C. P. W. Tsang |
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| Rok vydání: | 1990 |
| Předmět: |
Quality Control
medicine.medical_specialty Oviposition General Medicine Biology 1α 25 dihydroxycholecalciferol chemistry.chemical_compound Egg Shell Animal science Endocrinology chemistry Calcitriol Internal medicine medicine Animals Animal Science and Zoology Female Eggshell Cholecalciferol Chickens Food Science |
| Zdroj: | British poultry science. 31(2) |
| ISSN: | 0007-1668 |
| Popis: | 1. The effect of replacing dietary cholecalciferol (D3) by 1 alpha,25-dihydroxycholecalciferol (1,25-(OH)2D3) on egg shell quality and egg production was tested on 32-week-old White Leghorn laying hens over 9 weeks. 2. Hens fed on a diet supplemented with 5 micrograms 1,25-(OH)2D3/kg diet, tended to lay more eggs, and the eggs had significantly higher specific gravity and percentage shell than eggs from control hens fed on a diet supplemented with 27.5 micrograms D3/kg diet. 3. The effect became apparent after about 4 weeks of treatment and persisted until the end of the test. 4. Hens fed on a diet without D3 supplement started to lay very thin or soft shelled eggs within 4 weeks, suggesting that the birds' reserves of D3 or its metabolites were depleted within this period. 5. The results suggest that 1,25-(OH)2D3 can be substituted for D3 in layer diets to improve egg shell quality. |
| Databáze: | OpenAIRE |
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