- 期刊
產蛋菜鴨對苯丙胺酸及酪胺酸需要量之研究
Phenylalanine and tyrosine requirements of laying Tsaiya ducks
摘要
本試驗之目的在探討產蛋菜鴨對苯丙胺酸與酪胺酸之需要量，並測定飼糧苯丙胺酸與酪胺酸含量對鴨隻之產蛋性能、血漿與蛋中苯丙胺酸與酪胺酸濃度及繁殖性能之影響。試驗以玉米－大豆粕為主之粉狀基礎飼糧，含苯丙胺酸與酪胺酸1.00%，再逐級添加L-苯丙胺酸0、0.15、0.30、0.45、0.60及0.70%。各處理組飼糧之粗蛋白質均為17.0%，代謝能約為2750 kcal/kg。試驗為期20週（30～49週齡）。試驗結果顯示，飼糧苯丙胺酸與酪胺酸含量，對產蛋菜鴨之蛋重與飼料採食量及飼料利用效率之影響並無顯著差異。體重變化方面以1.30、1.45及1.60%處理組較其餘處理組有較大之失重，產蛋率則以飼糧苯丙胺酸與酪胺酸含量1.30%與1.45%處理組顯著高於其於處理組（P＜0.05），以曲棍法分析求得產蛋及飼料利用效率所需之最低飼糧苯丙胺酸與酪胺酸之需要量分別為1.33%與1.36%。在受精率及孵化率方面，各處理組間皆無顯著差異。血漿中苯丙胺酸與酪胺酸濃度隨飼糧苯丙胺酸添加量之提高而上昇，蛋中之苯丙胺酸與酪胺酸含量在各處理組間均無顯著差異。由上述試驗結果推薦產蛋菜鴨維持產蛋與最佳飼料利用效率所需之最低飼糧苯丙胺酸與酪胺酸含量介於1.33%～1.36%。
並列摘要
The purpose of this study was to determine the phenylalanine and tyrosine requirements of laying Tsaiya ducks. In addition, the effects of dietary phenylalanine and tyrosine supplementation on the laying performance, concentration of phenylalanine and tyrosine in plasma and reproduction traits were determined. Corn-soybean basal diet containing CP 17%, ME 2,750 kcal/kg, Ca 3.0%, available phosphorus 0.49% and, phenylalanine and tyrosine 1.0% supplement was used. Graded levels of phenylalanine at 0, 0.15, 0.30, 0.45, 0.60 and 0.70% were added to the basal diet. Three hundred and sixty laying Tsaiya ducks in triplicates per treatment were used in this experiment for 20 weeks. The results indicated that there were no significant difference in egg weight, feed intake or feed efficiency among treatments. Ducks fed on diet with 1.0, 1.45 and 1.60% phenylalanine + tyrosine supplement had higher body weight gains. The diet containing 1.30% and 1.45% phenylalanine and tyrosine supplement had higher egg production than the other treatments (P ＜ 0.05). According to the bent-stick method, dietary phenylalanine + tyrosine level for the best egg production and feed efficiency were 1.33% and 1.36%, respectively. There were no significant differences in fertility and hatchability among the treatments. The concentration of plasma phenylalanine and tyrosine tended to increase as the dietary phenylalanine and tyrosine levels were increased. Dietary phenylalanine and tyrosine levels did not affect the content of phenylalanine or tyrosine in the eggs. We recommended that the requirements of dietary phenylalanine and tyrosine levels for the best egg production and feed efficiency were 1.33%~1.36%.