Brück I, Anderson G A, Hyland J H
University of Melbourne, Department of Veterinary Science, Werribee, Victoria.
Aust Vet J. 1993 Aug;70(8):299-303. doi: 10.1111/j.1751-0813.1993.tb07979.x.
The records of 1630 mare years from 6 Thoroughbred stud farms in south eastern Australia were analysed for the years 1981 to 1986. Overall pregnancy and foaling rates were 83.9% and 69.3%, respectively. When calculated per served oestrous cycle, pregnancy and foaling rates were 54.7% and 43.1%, respectively. Pregnancy and foaling rates were higher (P < 0.001) for mares 3 to 10 years of age than for older mares. There was no difference in the pregnancy rates of maiden, barren and foaling mares. The foaling rate was significantly higher (P < 0.001) in mares that became pregnant during the first served oestrous cycle (77.8%) than in mares that needed two served oestrous cycles to become pregnant (65.4%). Of all diagnosed pregnancies, 19.5% were not completed. Pregnancy loss was lower (P < 0.05) in maiden (12.4%) than in barren (19.7%) or foaling (20.9%) mares. Twins were diagnosed in 7.8% of all pregnancies. If one conceptus was lost without external interference, 84.1% of pregnancies went to term. If one conceptus was manually crushed, 55.9% of pregnancies were maintained. If prostaglandin was used to terminate twin pregnancies, 60% of mares so treated produced foals the following year.
对澳大利亚东南部6个纯种马养殖场1981年至1986年的1630个母马年记录进行了分析。总体妊娠率和产驹率分别为83.9%和69.3%。按每个配种发情周期计算，妊娠率和产驹率分别为54.7%和43.1%。3至10岁母马的妊娠率和产驹率高于（P < 0.001）年龄较大的母马。未孕母马、不育母马和产驹母马的妊娠率没有差异。在第一个配种发情周期怀孕的母马（77.8%）的产驹率显著高于（P < 0.001）需要两个配种发情周期才怀孕的母马（65.4%）。在所有确诊的妊娠中，19.5%没有完成。未孕母马（12.4%）的妊娠丢失率低于（P < 0.05）不育母马（19.7%）或产驹母马（20.9%）。在所有妊娠中，7.8%被诊断为双胎。如果一个胚胎在没有外界干预的情况下丢失，84.1%的妊娠会足月分娩。如果人工挤压掉一个胚胎，55.9%的妊娠能够维持。如果使用前列腺素终止双胎妊娠，接受治疗的母马中有60%在次年产驹。
