Effects of Dietary Ascorbic Acid and Vitamin E Supplements on the Growth Performance, Blood Parameter and Immune Response of Broilers Exposed to High Ambient Temperature
| Autor: | Chieh-Min Chang, 張介銘 |
|---|---|
| Rok vydání: | 1999 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 87 The purpose of this study was to investigate the effects of ambient temperature and dietary ascorbic acid (L-ascorbic acid, coated; AA)and/or vitamin E (α-tocopherol, coated; VE) supplements under high ambient temperature on growth performance, blood parameters and immune response of broilers. The studies was divided into two trials, in trial 1, eighty-four male broilers (Arbor Acres) 21 days of age were used in this study. The broilers were randomly allotted to five treatments, which were (1) constant moderate temperature(24±1℃), (2) constant high temperature(34±1℃) and birds fed the basal diet as control, (3) constant high temperature and birds fed the basal diet supplemented with 250 ppm AA, (4)constant high temperature and birds fed the basal diet supplemented with 40 ppm VE and (5) constant high temperature and birds fed the basal diet supplemented with 80 ppm VE and (6) constant high temperature and birds fed the basal diet supplemented with 250 ppm AA + 40 ppm vitamin E and (5) constant high temperature and birds fed the basal diet supplemented with 250 ppm AA + 80 ppm vitamin E. Each treatment had three replicates with four birds per cage. Th experimental design of trial 2 was same as trial 1, except the birds were raised under natural high temperature(27~34℃). Two trials were carried out in climatic chamber. Feed and water were fed ad libitum. Body weight and feed intake data were recorded at the beginning and the end of the trial. The broilers were injected intravenously with 0.25％ sheep erythrocytes antigen 0.1 ml at 22 days and 29 days of age, respectively. Blood samples were taken at 21, 28, 35 and 42 days of age and serum were separated for electrolyte concentration, protein constituents, and antibody titer assays. Blood pH value, hematocrit, and rectal temperature were determined at 42 days of age. Experimental period was 3 weeks for each trial. The results of trial 1 showed that the body weight gain, feed intake, and feed conversion ratio of birds raised under constant high temperature were lower than those raised under constant moderate temperature (P |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|