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Effects of castration and testosterone implantation on growth, energy retention, and energy consumption of tissues in male chickens
|關鍵字:||Castration;去勢;Capon;Testosterone implantation;Tissue oxygen consumption;Carcass composition;Nutrient availability;閹雞;睪固酮埋植;組織耗氧量;屠體組成;營養分可利用率||出版社:||畜產學系||摘要:||
本試驗之目的在探討去勢及睪固酮埋植對公雞生長、營養分消化吸收與蓄積及臟器組織耗能之影響。試驗一及二分別以45隻8週齡單冠白色來航蛋公雞 (Single Comb White Leghorn; SCWL)進行手術，分成假手術公雞埋植膽固醇組 (Sham + CHOL)、閹雞埋植膽固醇組 (Capon + CHOL)及閹雞埋植睪固酮組 (Capon + TES)，每處理組3重複，每重複5隻，分別飼養至16及26週齡。結果顯示，去勢會顯著提高雞隻26週齡體重 (P < 0.05)，改善17至26週齡之體增重與飼料效率 (P < 0.05)，但不影響16週齡前之生長性狀；而去勢會抑制其雞冠發育 (P < 0.05)，同時提高雞隻腹脂、屠體總能與粗脂肪含量 (P < 0.05)，並降低屠體水分含量 (P < 0.05)；埋植睪固酮則會顯著降低閹雞腹脂、屠體總能與粗脂肪含量 (P < 0.05)，並提高屠體水分含量，達與公雞相似之水準 (P > 0.05)。去勢及睪固酮埋植顯著提高閹雞16週齡之蛋白質可利用率 (P < 0.05)。去勢會降低血液睪固酮濃度 (P < 0.05)，而閹雞埋植睪固酮後，會顯著提高睪固酮及血糖濃度 (P < 0.05)，同時降低16週齡雞隻血液肌酸酐含量 (P < 0.05)；而去勢並不影響16週齡公雞之粗脂肪與總能可利用率 (P > 0.05)，但會降低26週齡之總能可利用率 (P < 0.05)，且埋植睪固酮可降低26週齡閹雞粗脂肪可利用率 (P < 0.05)；去勢導致公雞26週齡灰分及乾物質營養分可利用率顯著降低 (P < 0.05)。去勢會顯著提高26週齡雞隻血液三酸甘油酯含量 (P < 0.05)，同時降低血液尿酸濃度 (P < 0.05)，而睪固酮埋植處理雖可顯著降低閹雞血液三酸甘油酯濃度及提高尿酸濃度 (P < 0.05)，然未能達公雞之水準 (P > 0.05)。綜上所述，公雞去勢會降低血液睪固酮濃度，但並不影響性成熟前 (16週齡)、後 (26週齡)臟器組織耗能，亦無法改善其脂肪及能量之消化利用，然卻可提高閹雞脂肪及能量之蓄積，而埋植睪固酮則會抑制閹雞脂質及能量之蓄積。
The purpose of this experiment was conducted to study the effects of castration and testosterone implantation on growth, nutrition availability, absorption and storage, and energy consumption of tissues in male chickens. Ninety 8 week-old Single Comb White Leghorn male chickens (SCWL) were castrated and divided equally into sham-operated, castration implanted with cholesterol and castration implanted with testosterone groups, respectively for trial 1 and trial 2. Fifteen male chickens were sham operated, the others were castrated at 8-week-old and allotted into the three treatment groups: sham-operated (Sham + CHOL), cholesterol-implanted capons (Capon + CHOL) and testosterone-implanted capons (Capon + TES). The results showed that castration significantly increased 26wk-old body weight, and significantly improved feed conversion ratio between 17 and 26 weeks in capons, and significantly decreased comb development (P < 0.05), and significantly increased abdominal fat weight, carcass gross energy and crude fat contents (P < 0.05), and significantly decreased carcass moisture content in 26wk-old capons (P < 0.05). However, capons implanted with testosterone significantly decreased abdominal fat weight, carcass gross energy and crude fat contents (P < 0.05), and significantly increased carcass moisture content (P < 0.05). The effect of castration and testosterone implantation significantly increased protein availability in 16wks-old male chickens (P < 0.05). The castration can significantly decreased testosterone content in the serum of male chickens before or after sexual maturity. Capons implanted with testosterone significantly increased testosterone and glucose contents, but decreased creatinine content in the blood. However, cascration did not influence crude fat and gross energy availability of 16wk-old male chickens, but decreased gross energy availability. Testosterone implantation capons significantly decreased crude fat availability. The castration significantly decreased ash, gross energy and dry matter availability in 26wk-old male chickens (P < 0.05). The castration significantly increased blood triacylglycerol in 26wks-old male chickens (P < 0.05), and significantly decreased blood uric acid content. However, capons implanted testosterone significantly decreased blood triacylglycerol and increased blood uric acid content (P < 0.05). The study suggested that castration decreased testosterone level in blood but did not influence tissue energy consumption and nutrient availability; However, it increased carcass fat and energy retentions in male chickens; Testosterone implantation can restrained fat and energy retention in male chickens.
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