Effects of Crude Enzyme Preparation Supplemented to Barley Diet on the Performance, Hormone Levels and Biochemical Parameters in Gosling

摘要

Twenty four 7-day-old crossbred goslings （Chuan white×Tai lake） were divided randomly into control and treatment groups. Enzyme preparation was added in the diet of treatment group at dosage of 1 g/kg. The blood samples were collected from 60 day-old goslings via the wing vein. During the fifty-three days experiment, body weights were adopted measured each week, related hormone contents and biochemical parameters in plasma were determined. The results were as following:（1） Compared with control, body weight of treatment group were significantly higher （P<0.05） since 3-week-old goslings. The weight gains were significant higher （P<0.05） in （4～7） week-old goslings too, feed intake were increased and the "feed: body weight gain" was decreased; （2） Compared with control, growth hormone （GH） and insulin-like growth factor-I （IGF-I） levels were dramatically enhanced by 36.62% （P<0.01） and 66.55% （P<0.01） respectively, while the level of β-endorphin （β-END） decreased by 51.66% （P<0.01）; （3） Thyroid-stimulating hormone （TSH） and 3,3′,5-triiodothyronine （T3） contents in treatment group were 24.39% （P<0.05） and （16.81%） （P<0.05） higher than those of control, whereas thyroxine （T4） contents was lower by 18.33% （P<0.05）, ratios of T3/T4 were increased; （4） Compared with control, insulin contents were elevated by 36.75% （P<0.01）, while level of glucagon was reduced by 23.11% （P<0.01）,ratios of insulin/glucagon were increased; （5） The activity of glutamic-pyruvic transaminase （GTP） was 4.46 fold higher than those of control （P<0.01） and uric acid content was reduced by 57.50% （P<0.01）.These results indicate that enzyme preparation added in barley based diet can promote the gosling growth by improving the barely digestibility, carbohydrate metabolism and influencing the hormone levels.