Amann R P, Thompson D L, Squires E L, Pickett B W
J Reprod Fertil Suppl. 1979(27):1-6.
Extragonadal reserves totalled 89 X 10(9) spermatozoa for 5--16-year-old sexually rested stallions and 60 X 10(9) for 2--4-year-olds. Regardless of age, the cauda epididymidis contained 62% of the total reserves and the vas deferens, including the ampulla, contained 7% of the total reserves of spermatozoa. The caput plus corpus epididymidis from 5--16-year-old stallions (N = 41) contained 14.9 X 10(9) spermatozoa per side as compared (P less than 0.01) to 8.5 X 10(9) for 2--4-year olds (N = 30). Frequency of ejaculation did not influence the number of spermatozoa found in caput plus corpus epididymidis. Across all ages, the number of spermatozoa potentially available for ejaculation from the cauda epididymidis and vas deferens on each side totalled 54 X 10(9). Collection of 5 successive ejaculates from sexually rested stallions removed 40--60% of the available spermatozoa while ejaculation every 2nd day reduced (P less than 0.05) the number of spermatozoa potentially available for ejaculation by 27%. Nevertheless, sufficient spermatozoa are produced daily (6.4 and 4.2 X 10(9) for 5--16-and 2--4-year-olds) to permit use of an average stallion once or twice daily, during spring and summer, providing sexual behaviour is adequate.
5至16岁性静止的种马性腺外储备的精子总数为89×10⁹个，2至4岁的种马为60×10⁹个。无论年龄大小，附睾尾部所含精子占总储备的62%，输精管（包括壶腹）所含精子占总储备的7%。5至16岁种马（N = 41）的附睾头加附睾体每侧含有14.9×10⁹个精子，相比之下（P < 0.01），2至4岁种马（N = 30）每侧为8.5×10⁹个。射精频率不影响附睾头加附睾体中的精子数量。在所有年龄段中，每侧附睾尾部和输精管中潜在可用于射精的精子总数为54×10⁹个。从性静止的种马连续采集5次射精，会使可用精子减少40%至60%，而每隔一天射精一次则会使潜在可用于射精的精子数量减少（P < 0.05）27%。然而，每天产生的精子数量足够（5至16岁的种马为6.4×10⁹个，2至4岁的种马为4.2×10⁹个），在春季和夏季，如果性行为正常，平均每匹种马每天可使用一到两次。
