猫の非排卵側子宮角内授精における精子数と対側卵子の受精率の関係(短報)(臨床繁殖学) Relationship between the Sperm Count and the Fertilization Rate of Ova Ovulated from the Contralateral Ovary in Intrauterine Horn Insemination in Cats(Theriogenology)

猫の片側子宮角内授精(UIUI)において,対側から排卵した卵子の受精状況を観察した.排卵を抑制した側の子宮角内に2×10^6,4×10^6,8×10^6の精子を授精した結果,受胎率はそれぞれ1/11(9.1%),2/11(18.2%),5/7(71.4%)であった.また,8×10^6群の受精率は70.7%であった.このように猫においては,UIUIで多数の精子を授精しても,固体によっては対側の卵子を受精しないもの,また,受精率の低いものがみられた.

Unilateral intrauterine horn insemination (UIUI) was carried out in cats, and we investigated the fertilization rate of ova ovulated from the contralateral ovary. Various numbers of sperm were used to inseminate the uterine horn on the side where ovulation was inhibited. The rates of conception were 1/11 (9.1%), 2/11 (18.2%), and 5/7 (71.4%) in the 2×10^6, 4×10^6, and 8×10^6 groups, respectively. Furthermore, the fertilization rate was 70.7% in the 8×10^6 group. Thus, ova ovulated from the contralateral ovary were not fertilized or the fertilization rate was low in some cats even when UIUI was performed with a large number of sperm.