仔羊飼養模式建立－III.日糧精科與苜蓿粒比對早期離乳撒能閹公羊生長性狀之影響

本試驗使用24頭剛出生之撒能仔公羊，逢機分為兩組置於群飼欄飼養。兩組均以任食代乳粉所沖泡的乳汁與教槽料之飼養方式飼養。一組仔羊在出生後二月齡離乳，另一組仔羊在出生後三月齡離乳。仔羊離乳後再逢機分為兩組，分別供給兩種日糧，其精料與苜蓿粒比分別為7：3與9：1，飼養試驗進行六個月。試驗結果顯示，二月齡離乳且飼養精料與苜蓿粒之比為9:1的山羊，其平均每日增重及飼料乾物質換肉率，顯著優於其他三組（P＜0.05）。在肥育後期胸圍（X）cm與體重（Y）kg之線性迴歸方面，同樣顯示在二月齡離乳且飼養精料與苜蓿粒比為9：1的山羊，在離乳後用胸圍與其線性迴歸方程式來預測其體重較接近其原有體重。在山羊每增重一公斤之飼料成本方面，二月齡離乳且飼養精料與苜蓿粒之比為9:1的山羊，其每公斤增重的飼料成本，顯著較其他三組便宜（P＜0.05）。在屠體評估方面，四組之屠宰率、精肉率及體脂肪率，均無組間差異存在。然而在屠體冷藏前與冷藏後之變化方面，二月齡離乳之山羊其屠體冷藏前與冷藏後之失重顯著較三月齡離乳之山羊為少（P＜0.05）。在精肉生產量方面，二月齡離乳且飼養精料與苜蓿粒比為7：3的山羊，顯著較其他三組為差（P＜0.05）。在每公斤精肉生產成本方面，二月齡離乳且飼養精粗料之比為9:1的山羊，顯著較其他三組便宜（P＜0.05）。顯示仔羊離乳前以任食人工奶與教槽料之方式飼養，且在二月齡離乳後用精料與苜蓿粒比9:1方式肥育，可獲得較佳的經濟效益。

關鍵字

精料與苜蓿粒比；撒能閹公羊；早期離乳

並列摘要

Twenty-four Saanen male kids were divided into two groups after kidding. Both were fed replacer milk and creep ration until weaning. One group was weaned at two months after kidding, and divided into another two small groups. There were fed concentrate and alfalfa pellets in 7:3 and 9:1 ratios. The other group were weaned at three months after kidding, and also divided into another two small groups. They were also fed concentrate and alfalfa pellets in 7:3 and 9:1 ratios. During the experiment period, the data of dry matter intake volume and average daily gain weight of goats were collected for analysis until they reached the slaughter weight. Results showed that goats, which were weaned at two months and fed with concentrate and alfalfa pellets in 9 : 1 ratio, had significant differences in daily dry matter intake, daily gain weight and feed efficiency from the other three groups of goats (P ＜ 0.05). The correlation equations between chest circumference (cm) and body weight (kg) of kids were calculated. There were Y_1 = 1.34X_1 - 65.12, R^2 = 0.86; Y_2 = 0.84X_2 - 20.75; R^2 = 0.93; Y_3 = 0.75X_3 - 15.25; R^2 = 0.84; Y_4 = 0.64X_4 - 4.15; R^2 = 0.91. Goats, which were weaned at two months and fed with concentrate and alfalfa pellets in 9:1 ratio, had higher relatively coefficient among the other three groups goats. The costs of per kg live weight gain and per kg meat production of goats weaned at two months and fed with concentrate and alfalfa pellets at 9:1 ratio were significantly lower among the other three groups goats (P ＜ 0.05). It seemed that goats, weaned at two months and fed with concentrate and forage in 9:1 ratio, had higher economical benefit than that of the other three groups.

並列關鍵字

Castrated Saanen male kids ； Ratio of concentrate and forage ； Early weaning

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