多產豬種之培育Ⅲ.梅山與杜洛克豬雜交三代之生長性狀

張伸彰 涂海南 許晉賓 吳明哲 張秀鑾

行政院農業委員會畜產試驗所

本研究旨在探討梅山豬(M)與杜洛克(D)豬雜交二代F2(MDMD與MDDM分別以md與dm簡稱)後裔豬之生長性能，藉此瞭解雜交三代(F3)生長性能作為未來選拔依據。試驗豬群包括F2代md公豬與配md母豬之後裔(mdmd)公豬50頭，女豬87頭、dm公豬與配md母豬之後裔(mddm)公豬48頭，女豬79頭、md公豬與配dm母豬之後裔(dmmd)公豬52頭，女豬64頭和dm公豬與配dm母豬之後裔(dmdm)公豬52頭，女豬86頭，計有公豬202頭與女豬316頭。參試豬隻生長性能檢定期間自70至210日齡，測定性狀包括70（W70）、90（W90）、120（W120）、150（W150）、180（W180）與210日齡（W210）之體重，及150(BF150)、180（BF180）與210日齡（BF210）之第五肋、最後肋與最後腰椎離背中線5公分處之背脂厚度平均。公豬採個檢方式進行，並測定檢定期間之飼料效率（FE）；而女豬則以群檢方式進行。結果顯示：mdmd女豬W180與W210均顯著較mddm及dmdm者重（P<0.001），而dmdm女豬BF180與BF210背脂則顯著較mdmd及dmmd者為薄（P<0.01）。同時，mdmd公豬之W210與(BF180及BF210)均顯著地較mddm及dmdm者重(P<0.05)與厚((P<0.01)。

關鍵語：梅山豬、杜洛克豬、生長性能。

DEVELOPMENT OF PROLIFIC LINE IN SWINE III. GROWTH
TRAITS IN F3 OF MEISHAN AND DUROC CROSSES

S. C. Chang, H. N. Twu, C.B. Hsu, M. C. Wu and H. L. Chang

Taiwan Livestock Research Institute, Council of Agriculture

The objective of this study was to evaluate the growth performances of F3 generation in Meishan (M) and Duroc (D) crosses pigs for selection reference. Pigs evaluated including progeny of F2, expressed as md and dm for MDMD and MDDM, respectively, which were obtained from intercrossing of M and D crosses. There were four groups of F3 pigs tested which mdmd, mddm, dmmd and dmdm being the progeny of md sows sired by md boars, md sows sired by dm boars, md sows sired by dm boars and dm sows sired by dm boars, respectively. A total of 202 boars and 326 gilts were growth performances tested during 70 an 210 days of age, which including 50 boars and 87 gilts of mdmd, 48 boars and 72 gilts of mddm, 52 boars and 64 gilts of dmmd, and 52 boars and 86 gilts of dmdm crosses, respectively. Traits evaluated were body weights at 70 (W70), 90 (W90), 120 (W120), 150 (W150), 180 (W180) and 210 (W210) days of age, and averaged backfat thickness at 150 (BF150), 180 (BF180) and 210 (BF210) days of age which were measured at 5 cm from dorsal line of the fifth and the last ribs, as well as the last lumbar. Boars were tested individually and the corresponding feed efficiency during testing period was also evaluated. Since gilts were group housed, feed consumed information was lacked. Result showed that mdmd gilts weighed heavier at 180 and 210 days of age than those of mddm and dmdm gilts (P<0.001). Significant thinner backfat measures at 180 and 210 days of age were found in dmdm gilts than those of obtained from mdmd and dmmd gilts（P<0.01）. Furthermore, mdmd boars had thicker backfat at 180 and 210 days of age than those measured in mddm and dmdm pigs (P<0.01). Similar trend also observed at body weight at 210 days of age (P<0.05).

Key Words: Meishan pigs, Duroc pigs, Growth performances.