Growth and development of the digestive organs and some enzymes in broiler chicks after hatching∗
| Autor: | G. Ben‐Avraham, Z. Zoref, I. Nir, Zafrira Nitsan |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Male
medicine.medical_specialty Weight Gain Eating Internal medicine Intestine Small medicine Animals Chymotrypsin Trypsin Amylase Lipase Pancreas biology Hatching Organ Size General Medicine Small intestine medicine.anatomical_structure Endocrinology Liver Amylases biology.protein Animal Science and Zoology Digestion Chickens Digestive System Food Science medicine.drug |
| Zdroj: | British Poultry Science. 32:515-523 |
| ISSN: | 1466-1799 0007-1668 |
| DOI: | 10.1080/00071669108417376 |
| Popis: | 1. Body weight and the weight of the digestive organs and activities of some digestive enzymes were determined from hatching to 23 d of age. 2. Relative daily growth rate peaked at 11 d of age (22% gain/d) and then decreased gradually. 3. The vitelline residue was decreased rapidly from 4.6 g at hatching to negligible values from 4 d of age. 4. Maximal allometric growth of the pancreas and small intestine was 4-fold and that of liver 2-fold greater than that of the body. 5. Activities (units/kg body weight) of the digestive enzymes measured in the pancreas and intestinal contents increased with age. In the pancreas maximal values were attained on day 8 for amylase and lipase and 11 for trypsin and chymotrypsin. In the small intestine maxima were attained on day 4 for lipase, 11 for trypsin and chymotrypsin and 17 for amylase. 6. The development of secretion of digestive enzymes in the post-hatched chick could be a limiting factor in digestion and subsequently in food intake and growth. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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