Kunavongkrit A, Larsson K
Nord Vet Med. 1982 Jan-Feb;34(1-2):20-4.
The object of the investigation was to compare the activity between left and right ovaries in gilts slaughtered after their 1st, 2nd, 3rd or 4th detected oestrus and to relate the incidence of embryonic migration to the total number of foetuses present. The study comprised 254 cross bred gilts (Swedish Landrace X Swedish Yorkshire) not returning to oestrus within 24 days after A.I. with frozen semen. The gilts were slaughtered 5-8 weeks after A.I. The genital tracts were examined within two hours after slaughter. The number of corpora lutea and the number of normally developed foetuses were recorded. The results indicated that the left ovary had a higher ovulation rate than the right (P less than 0.001). The left ovary was also heavier than the right (0.01 less than P less than 0.05). The number of corpora lutea increased from oestrous number 2 to 4 (2 vs 4, 3 vs 4, 0.01 less than p less than 0.05). The oestrous number did not significantly influence the fertilization rate. The incidence of embryonic migration increased with increasing number of foetuses (0.01 less than p less than 0.05). Migration from left to right and from right to left occurred with the same frequencies.
本研究的目的是比较在第1次、第2次、第3次或第4次发情后被屠宰的后备母猪左右卵巢的活性，并将胚胎迁移的发生率与现存胎儿的总数联系起来。该研究包括254头杂交后备母猪（瑞典长白猪×瑞典约克夏猪），这些母猪在人工授精（使用冷冻精液）后24天内未再次发情。母猪在人工授精后5 - 8周被屠宰。在屠宰后两小时内检查生殖道。记录黄体数量和正常发育胎儿的数量。结果表明，左卵巢的排卵率高于右卵巢（P < 0.001）。左卵巢也比右卵巢重（0.01 < P < 0.05）。黄体数量从第2次发情增加到第4次发情（第2次与第4次、第3次与第4次相比，0.01 < p < 0.05）。发情次数对受精率没有显著影响。胚胎迁移的发生率随着胎儿数量的增加而增加（0.01 < p < 0.05）。从左向右和从右向左的迁移频率相同。
