提高公马配母驴受胎率的研究

INVESTIGATIONS TO INCREASE THE CONCEPTION RATE OF THE STALLION-JENNET CROSS

由于公马配母驴(繁殖驴骡)的受胎率低,因此自1957—59,1961—62五年中进行了几次试验,探求提高受胎率的途径。在1957年试验中,用28匹母驴研究了“混精”授精及在母驴体内注射马血对受胎率的影响。在马驴“混精”中,驴精在加入马精以前先水浴加温至55℃,10分钟,再将精子磨碎。结果是用马精授精的14匹母驴,受胎率为28.6%;其余用“混合精液”受精的14匹母驴,受胎率为64.3%。在此同一试验中,也分析了注射马血对受胎率的影响。有14匹母驴从配种前45天开始,每周皮下注射属血20—40毫升,受胎率为42.9%;其余14匹母驴未注射马血,受胎率为50%。(在这两种处理的母驴中都包括有马、驴“混精”和马单精的母驴。)在母驴体内注射马血不但对提高受胎率并无影响,而且还产生不良作用,有一匹母驴因注射马血而死亡。 1958—59及1961—62四年的继续试验中,用精子已被杀死的驴精液加入马精液中“混精”授精母驴121匹次,其受胎率为52.7%,用马精液授精的母驴110匹次,共受胎率为27.3%。进一步藐明“混精”可以提高公马配母驴的受胎率。

Several experiments were carried out during the last few years on the improvement of conception rate for increasing the hinny productions—a crossbreed between the stallion and jennet. Twenty eight jennets were used in the investigations of 1957 and a factorial design was employed to study the effect of "mixed semen" and blood-injection upon the conception rate. The conception rate was only 28.5% of the 14 animals which were inseminated with semen of the stallion and it was raised to 64.3% for the remaining jennets, inseminated with the "mixed semen" of jack and stallion. This jack semen had previously been treated with heat at about 55℃ for 10 minutes, and then followed by pulverization of the spermatozoa. In the same investigations the effect of the injection of horse blood was analyzed. Successive injections of 20-40 ml of horse blood subcutaneously at about one-week intervals started 45 days before the insemination were given to one-half of these 28 jennets, and the other half remained intact. The conception rate of the injected was 42.9% and that of the non-injected was 50%, which including the stallion semen and the "mixed semen" insemination for the both treatments. The injection of horse blood therefore had no effect on the rate of conception whereas one animal died after this treatment. During 1958-59 and 1961-62 further investigations were made on the effect of the insemination of "mixed semen". One hundred and ten jennets were inseminated with the stallion semen and 121 jennets, with the "mixed semen". The conception rate of the former group was 27.3% and that of the latter was 52.7%. This confirmed our earlier result.