登錄種豬取得產肉登錄號的世代間距

賴永裕　李世昌　張秀鑾　黃鈺嘉　吳明哲

行政院農業委員會畜產試驗所

種豬檢定站完檢的公豬和母豬會取得產肉登錄號，從1983年1月1日至2003年3月6日出生，計有11,812頭；包括5,643頭杜洛克（D）、4,110頭藍瑞斯（L）2,014頭約克夏（Y）與45頭漢布夏（H）。產肉登錄的完檢豬是2,897頭血統登錄種公豬和6,684頭血統登錄種母豬的後裔豬。血統登錄種豬可取得產肉登錄號的資格為需有參頭後裔豬在檢定站完檢而取得產肉登錄，但這參頭後裔豬要來自不同胎，意即同父異母三胎或同母異父三胎。結果顯示，計有999頭血統登錄種公豬和139頭血統登錄種母豬可藉此而取得產肉登錄號。進一步分析親子代間出生日期之間距，並視為產肉登錄的世代間距。種公豬為親代時，則D、L、Y與H品種之平均世代間距分別為809、815、888與758天；種母豬為親代時，在D、L與Y品種分別為1,332、1,472與1,506天，無H品種母豬取得產肉登錄號。在D、L與Y品種，同父異母的世代間距較同母異父者均縮短1.5年。然同母異父的產肉登錄世代間距最短者也有兩年以內者，在D、L與Y品種分別為669、704與638天；而同父異母時，更有一年內者，在D、L與Y品種分別為346、337與350天。結果顯示產肉選拔可在一年一世代內完成。

關鍵語：登錄、生長、選拔。

GENERATION INTERVAL OF MEAT PRODUCTION IN BREED REGISTRATION OF PIGS

Y. Y. Lai, S. C. Lee, H. L. Chang, Y. C. Huang and M. C. Wu

Livestock Research Institute, Council of Agriculture, Executive Yuan

Registration on meat production of growing pigs must be tested at the Boar Test Station and the pig was granted from the growth performance test. A total of 11,812 head of granted pigs with registration on meat production was analyzed with their birth dates from 1983/1/1 to 2003/3/6 and there were 5,643 head of Duroc (D), 4,110 head of Landrace (L), 2,014 head of Yorkshire (Y) and 45 head of Hampshire (H). They were progeny of 2,897 and 6,684 blood registered boars and sows, respectively. Blood registered boar or sow can be proved as meat registered breeding stock when three of the corresponding progeny receiving meat registration from the Test Station. However, the three progeny must come from three different litters either from paternal half siblings or maternal half siblings. There were 999 boars and 139 sows having the progeny proof on meat production. Generation interval was then calculated from both birth dates between parent and offspring. When paternal siblings used, the mean generation interval were 809, 815, 888 and 758 days in D, L, Y and H boar, respectively. The corresponding intervals were 1,332, 1,472 and 1,506 days in D, L and Y sows, respectively. None of H sows received meat registration. Results concluded that paternal siblings for meat registration in D, L and Y boars were 1.5 years lesser than that of maternal siblings. However, there were still cases of maternal siblings with a generation interval of 2 years or less and were 669, 704 and 638 day in D, L and Y sows, respectively. In paternal siblings, the corresponding interval could be even shorter and less than one year, which were 346, 337 and 350 days of generation interval in D, L and Y breed, respectively. It confirmed that one year one generation on meat production via mass selection program could be done.

Key words: Registration, Growth, Selection.