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題 名 | 屠宰週齡對大體型閹雞血液、屠體性狀、皮膚及肌肉色澤之影響=Effect of Slaughter Age on Plasma and Carcass Traits in Caponized Taiwan Native Chickens |
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作 者 | 林正鏞; 劉登城; 許振忠; | 書刊名 | 畜產研究 |
卷 期 | 43:4 2010.12[民99.12] |
頁 次 | 頁307-316 |
分類號 | 473.6 |
關鍵詞 | 大型閹雞; 屠宰週齡; 屠體性狀; 皮膚與肌肉色澤; Heavy-type capon; Slaughter age; Carcass trait; Skin and muscle color; |
語 文 | 中文(Chinese) |
中文摘要 | 試驗選用商用紅羽公土雞 594 隻,雞隻於 13 週齡時施予外科去勢,從 25 週齡至 31 週齡,每週逢機屠宰 81 隻,以比較屠宰週齡對大型閹公雞血液、屠體性狀、皮膚與肌肉色澤及飼料利用效率之影響。結果顯示,血漿尿素氮、尿酸、總蛋白質、三酸甘油酯及總膽固醇濃度隨年齡增加而增加。羽毛、肝臟、心臟、砂囊與腳部比例隨年齡增加而減少,腹脂比例隨年齡增加而增加;屠體重隨年齡增加而增加至 29 週齡達高峰,屠宰率隨年齡增加而增加至 27 週齡達高峰,29 週齡以後再下降,腸道比例以 26 週齡顯著(P < 0.05)較 27 週齡以後者高,頭頸比例以 29 週齡以前者顯著(P < 0.05)較 30 週齡以後者高,背部比例以28及31週齡顯著(P < 0.05)較 25 週齡低。翅膀比例以 31 週齡顯著(P < 0.05)較30週齡以前者低,腿部比例以30週齡以後者顯著(P < 0.05)較 29週齡以前者高。胸肉 b 值及腿部皮膚 b 值以 25 週齡顯著(P < 0.05)較其他週齡大。由本試驗之血液與屠體性狀結果觀之,大體型閹雞之屠宰週齡以不超過 27 週齡較適當。 |
英文摘要 | An experiment was carried out to determine the effects of slaughter age on plasma and carcass characteristics of large type caponized Taiwan native chickens. A total of five hundred and ninety-four cockerels were surgically caponized at 13 weeks of age. Birds were bleeded and slaughtered from 25 weeks through 31 weeks of age with 1 week interval. The results indicated that the plasma urea nitrogen, uric acid, total protein, triglyceride and total cholesterol concentration, or abdominal fat ratio of chickens were significantly(p < 0.05)increased with the increase of age. On the contrary, the feather, liver, heart, gizzard ratios and feet part percentage decreased significantly(p < 0.05)with the increase of age. The peak of slaughter live weight appeared at 29 weeks of age. Dressing percentage reached peak at 27 weeks of age, and declined at 29 weeks of age. Birds after 27 weeks of age had lower (p < 0.05) intestine ratio than birds before 26 weeks of age. Birds before 29 weeks of age had greater head and neck part ratio than birds after 30 weeks of age. The back part ratio of birds at 28 and 31 weeks of age was lower (p < 0.05) than those of birds at 25 weeks of age. The wing part ratio of birds at 31 weeks of age was lower (p < 0.05) than those of birds before 30 weeks of age. Birds after 30 weeks of age had greater (p < 0.05) thigh part ratio than birds before 29 weeks of age. Chest muscle and thigh skin b value at 25 weeks of age were greater (p < 0.05) than those at the other weeks of age birds. In conclusion, the optimal slaughter age was no more than 27 weeks of age for plasma and carcass traits. |
本系統中英文摘要資訊取自各篇刊載內容。