Effects of Age on Nutrient Digestibility in Chicks fed Different Diets
Open Access
- 1 March 2002
- journal article
- research article
- Published by Elsevier BV in Poultry Science
- Vol. 81 (3), 400-407
- https://doi.org/10.1093/ps/81.3.400
Abstract
Three experiments were conducted to determine the effects of age on apparent MEn and apparent amino acid (AA) digestibility of various diets for New Hampshire × Columbian (Experiments 1 and 2) and commercial broiler (Experiment 3) male chicks. Excreta were collected at 0 to 2, 3 to 4, 7, 14, and 21 d of age in all experiments, and nutrient digestibility was determined using acid-insoluble ash as a marker. The first experiment evaluated a corn-soybean meal (SBM) diet. Both MEn and digestibility of AA increased with age, and broken-line regression analysis predicted a plateau at 14 d for MEn and 10 d of age for AA digestibility. For example, MEn increased from 2,970 to 3,430 kcal/kg DM, and lysine digestibility increased from 78 to 89% between 0 and 14 d of age. The second experiment evaluated cornstarch-crystalline AA, dextrose-casein, corn-SBM, and corn-canola meal diets. The MEn of the corn-SBM, corn-canola meal, and cornstarch-crystalline AA diets increased from 0 to 14 d of age. In contrast, the MEn of the dextrose-casein diet was high (3,800 kcal/kg DM) immediately after hatching and did not increase substantially with increasing age. Digestibility of AA increased with age for the corn-SBM and corn-canola meal diets, and broken-line regression analysis again predicted a plateau at approximately 10 d of age. Conversely, AA digestibility of the dextrose-casein and cornstarch-crystalline AA diets was high immediately after hatching (93 to 96%) and increased only slightly with age. The results of Experiment 3 with commercial broiler chicks also showed significant (P < 0.05) increases in MEn and AA digestibility with increasing age. The results of this study indicated that the MEn and AA digestibility of corn-SBM and corn-canola meal diets increase with age for young chicks. The results also showed that MEn and AA digestibility were very high for a dextrose-casein diet immediately after hatching. Thus, the latter ingredients may have beneficial effects for very young chicks.Keywords
This publication has 19 references indexed in Scilit:
- Energy utilisation of carbohydrate, fat and protein sources in newly hatched broiler chicksBritish Poultry Science, 1999
- Digestion and Absorption in the Young ChickPoultry Science, 1995
- Digestibility studies in broiler chickens: Influence of genotype, age, sex and method of determinationBritish Poultry Science, 1993
- Growth and development of the digestive organs and some enzymes in broiler chicks after hatching∗British Poultry Science, 1991
- The influence of environmental temperature, age and sex on the digestibility of amino acids in growing broiler chickensBritish Poultry Science, 1984
- Influence of age on the nutrient utilization of diets for broilersAnimal Feed Science and Technology, 1981
- A comparison of the energy and nitrogen metabolism of fed ducklings and chickensBritish Poultry Science, 1980
- A new method of determining metabolisability of energy and digestibility of fatty acids in broiler dietsBritish Poultry Science, 1975
- Influence of the age of chicken on the metabolisable energy values of poultry dietsBritish Poultry Science, 1968
- Automatic Recording Apparatus for Use in Chromatography of Amino AcidsAnalytical Chemistry, 1958