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種豬中央檢定與外貌体型評鑑相關性探討

王佩華（1） 賴永裕（2） 宋永義（1） 王旭昌（3） 朱慶誠（4）

（1）國立台灣大學（2）行政院農委會畜產試驗所
（3）中央畜產會家畜組（4）行政院農業委員會畜牧處

本研究乃針對中央檢定站檢定合格種豬進行外貌体型評鑑，以了解中央檢定對種豬外貌体型改良之影響。研究自2002年1月至2004年3月期間，在中央檢定站於各期完檢後之合格種豬共計1602頭（公豬：1438頭；女豬：164頭）進行外貌体型評鑑，並自各品種檢定合格頭數中選取其1/2至1/3頭數排名評等。另將外貌体型評鑑之評等排名與其檢定指數100以上之順位序列，進行史畢滿順位相關係數（Spearman's Rank Correlation Coefficient）分析。由數據顯示，各期送檢種豬頭數中以杜洛克公豬最多（50％以上），次為藍瑞斯公豬。經檢定合格且外貌体型評鑑錄取率約20%，計308頭（公豬：250頭；女豬：58頭）。由杜洛克種公豬之史畢滿順位相關顯示，檢定指數與外貌体型評鑑之相關性至高（r=0.73），顯示其經濟生長性與優異外貌体型之遺傳有頗高之穩定性；另綜觀藍瑞斯公豬之史畢滿順位相關係數偏大，其原因可能為公系用種公豬與母系用種公豬之体型有所區隔之故；由杜洛克及藍瑞斯母豬史畢滿順位相關，發現做為公系用品種之杜洛克母豬之順位相關r=0.5，而母系用品種藍瑞斯母豬之r=1.0，顯示杜洛克母豬受杜洛克公豬之傾向筋肉之肉豬型体型之影響較深，使外貌体型評等與檢定成績之順位相關不如藍瑞斯之一致。

關鍵語：體型、中央檢定、史畢滿順位相關係數。

ASSOCIATION BETWEEN PERFORMANCE OF CENTRAL TEST
STATION AND CONFORMATION JUDGING OF PIGS

P. H. Wang(1), Y. Y. Lai(2), Y. Y. Sung(1), H. C. Wang(3) and C. C. Ju(4)

(1)National Taiwan University (2) Livestock Research Institute, Council of Agriculture
(3)National Animal Industry Foundation (4)Council of Agriculture, Executive Yuan

The purpose of this study was to explore the reason of using performance data in pig conformation judging and to understand the influence of performance on conformation judging. Data of pig conformation judging was collected from Jan. 2002 to Mar. 2004. There were 1602 pigs performance tested totally, in which 1438 was young boars and 164 was gilts. Judging practiced only on top 30% to top 50% animals based on test performance. Re-edited data set kept animals’ with index equal or above 100 only. Spearman's Rank Correlation Coefficient (rs) was the main statistic for the associations. In the data set, Duroc boar had highest frequency( > 50%) completed the performance test and frequency of Landrace boar was next to Duroc boars. The certified pigs was around 20%, 308 pigs, 250 boars and 58 gilts, in total. The Spearman's Rank Correlation Coefficient of Duroc boars was 0.73 which indicated high association between performance and conformation judging’s. But, the high coefficient of the Landrace boars might related to the difference of the selection goals between sire line and dam line. The rs s of Duroc and Landrace gilts were 0.5 and 1.0 respectively which implied gilts of Duroc might too emphasized on muscularity and turned to less consistent than Landrace gilts’.

Key Words: Body conformation, Central test station, Spearman's Rank Correlation Coefficient.