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抄録
犬の卵管内授精で,受胎に必要な精子数を明らかにすることを計画した.0.5×10^6,2.0×10^6あるいは4.0×10^6個の精子を左右卵管内に授精した.その結果,授精精子数別の受胎率はそれぞれ,0%(O/5頭),75.0%(6/8頭),37.5%(3/8頭)であった.受胎したうち3頭(33.3%)が流産し,分娩した6頭の産子数は,平均2.5±0.5(SE)と少数であった.なお,帝王切開を実施した1例において,正常な治胎子と共に無形無心体が1個見られた.
The number of spermatozoa required to obtain conception by intratubal insemination in dogs was examined. Three groups consisting of 5, 8 and 8 dogs received 0.5 x 10^6, 2.0 x 10^6 and 4.0 x 10^6 spermatozoa, respectively, into each uterine tube. No conception occurred in the 5 animals inseminated with 0.5 x 10^6 spermatozoa, but conception occurred in 6/8 (75.0%) and 3/8 (37.5%) dogs inseminated with 2.0 x 10^6 and 4.0 x 10^6 spermatozoa, respectively. Among the pregnant animals, three aborted (33.3%) and the mean number of newborns was small, 2.5 ± 0.5 (SE). One acardiacus anceps was observed with normal fetus in one animal with a Caesarean delivery.
