Studies on soft-shelled turtle (Pelodiscus sinensis) dietsⅠ. Effect of expanded pellet diets on the culture of breeder soft-shelled turtlesⅡ. Effect of dietary crude fiber levels on the growth parameters of juvenile soft-shelled turtles
| Autor: | Ho, Yi-Hsuan, 何奕萱 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 Two feeding trials were conducted to evaluate the effects of expanded pellet diets on the culture of breeder soft-shelled turtles and the effects of dietary crude fiber levels on the growth parameters of juvenile soft-shelled turtles. In experiment 1, to test the expanded pellet diets for breeder soft-shelled turtles on palatability, survival rate, egg production, and hatchability. Six thousand breeder soft-shelled turtles at about two and half years of age were randomly allotted into 2 treatments × 3 replicates experimental design with 1000 breeder soft-shelled turtles in each pond. The two treatment groups were fed diets with either control group (wet diets) or treatment group (expanded pellet diets) for 10 months. Results indicated that no significant differences in palatability, egg production and hatchability were observed between the two groups. The results of survival rate were significantly higher in the treatment group than the control group (95.5 vs. 94.7%). In experiment 2, to test the crude fiber levels of juvenile soft-shelled turtle diets on the growth parameters. Juvenile soft-shelled turtles of mean body weight 4.1g were fed diets supplemented with 5 levels of crude fiber (0, 4, 8, 12, 16%) for 10 weeks, and the actual crude fiber contents were measured as 3.88, 7.35, 11.72, 15.46 and 19.42%. Each diet was fed to 20 juvenile soft-shelled turtles in individual plastic cans. After 10 weeks of feeding trial, body composition, blood parameters, enzyme activity analysis of the juvenile turtles were conducted. The results indicated that no significant differences in weight gain (WG), protein efficiency ratio (PER), feed conversion ratio (FCR), survival rate, body composition, and hepatosomatic index (HSI) were observed between the testing groups. The results of blood parameters, red blood cell (RBC), hemoglobin (Hb) and mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC) were not significantly different, however, the hematocrit (Hct) was significantly increased in the 19.42% crude fiber group than the 3.88 and 7.35% crude fiber groups. The results of serum aspartate aminotransferase (AST) activities was significantly increased in the 3.88% crude fiber group than the 7.35, 11.72, 15.46 and 19.42% crude fiber groups. The results of villus height of the large intestine was significantly increased in the 15.46% crude fiber group than the 11.72 and 19.42% crude fiber groups. The overall experimental results showed that the expanded pellet diets did not negatively impact the palatability, egg production and hatchability, however, increased survival rate of the breeder soft-shelled turtles. The crude fiber levels of juvenile soft-shelled turtles diets did not negatively impact on the growth parameters, body composition, blood analysis and healthy status of the juvenile soft-shelled turtles. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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