PMSG处理卵巢静止奶牛以缩短产犊间隔的研究

Treatment with PMSG of Ovarian Quiescence in Dairy Cows

将４１头产后４０－１００天卵巢静止奶牛分为四个处理组：ＯＩＵＰＭＳＧ（ｎ＝１２）、１０００ＩＵＰＭＳＧ（ｎ＝１２）、１２５０ＩＵＰＭＳＧ（ｎ＝１２）及１５００ＩＵＰＭＳＧ（ｎ＝５），处理后一周内的排卵率分别为０．０％、８３．３３％、９１．６７％及４０．０％（Ｐ＜０．０１），从处理到妊娠间隔时间分别为８９．１±３６．７天、２９．８±２且．７天、５１．９±２５．２天及６０．２±２９．６天（Ｐ＜０．０１）；２９头试验母牛又按产后４０－６０天及产后６１－１００天分为两组，处理后一周内的排卵率分别为９２．９％及６６．７％（Ｐ＞０．０５），从处理到妊娠间隔时间分别为５０．３±２７．０天及３８．５±２７．０天（Ｐ＞０．０５）。结果表明，ＰＭＳＧ处理卵巢静止母牛具有明显效果，其中以１０００ＩＵ为最优，处理时间的早晚对处理效果无明显影响。

In this study,41 dairy cows with ovarian quiescence during 40-100 days of postpartum were selected,and divided into four treatment groups: control (n=12), 1000IU PMSG (n=12), 1250IU PMSG (n=12) and 1500IU PMSG (n=5) groups. The ovulation rates of the four groups at 7 days after treatment were 0. 0%,83. 3 %, 91. 7 % and 40. 0 %,respectively, (P<R0. 01) and intervals from treatment to pregnancy were 89. 1±36. 7, 29. 8±21. 7, 51. 9 ±25. 2 days and 60. 2±29. 6 days (P<0. 01),respectively. Meanwhile,some cows (n=29) treated with PMSG (1000-1500IU) were divided into two groups according to time of treatment after parturition i. e. 40～60 days group (n=14) and 61～100 days group (n=15). The ovulation rates of the 40-60 dyas group and the 61-100 days group were 92. 95 % and 66. 7 %,and intervals from treatment to pregnancy were 50. 3±27. 0 and 38. 5±27. 0 days, respectiviy.The results indicated that the treatment of dairy cows with ovarian quiescence with 1000IU PMSG was themost effective treating time had no obvious effect on the results.