Testicular growth, hormone concentrations, seminal characteristics and sexual behaviour in stallions

Journal of Reproduction and Fertility
J NadenE L Squires

Abstract

Puberty was studied using 15 colts of Quarter Horse phenotype. Total scrotal width was measured every 8 weeks from 48 to 96 weeks. Blood samples were taken from 8 colts at 8, 16 and 24 weeks and then every 4 weeks until 100 weeks to measure changes in LH, FSH and testosterone concentrations. Seminal collections were attempted monthly from 48 to 64 weeks and every 2 weeks thereafter until puberty resumed every 3rd day from 96 weeks for 15 ejaculates. For all collections, times to erection, mount and ejaculation and seminal characteristics were recorded. Age at puberty was defined as the first ejaculate containing 50 x 10(6) spermatozoa, with greater than or equal to 10% motile. Colts were castrated at 2 years to enable determination of daily sperm production (DSP), epididymal sperm reserves and normality of spermatogenesis. Total scrotal width increased linearly from 48 to 96 weeks. Age at puberty averaged 83 weeks (56-97 weeks). Changes in serum concentrations of LH and FSH were parallel, rising at 36-40 weeks, declining after 40 weeks and rising again at 68-80 weeks. Testosterone was low until 68 weeks after which concentrations rose slowly to 80 weeks and increased rapidly to a plateau at 92 weeks. Sexual behaviour and semina...Continue Reading

Citations

Mar 29, 2000·Theriogenology·M I MeloG D Cassali
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Oct 15, 2014·The Journal of Reproduction and Development·Minjung YoonJanet Fay Roser
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Mar 25, 2019·Scientific Reports·Bei LiDugarjaviin Manglai
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Mar 27, 2020·Reproduction, Fertility, and Development·Bei LiDugarjaviin Manglai
Jul 15, 2017·Theriogenology·Malgorzata PozorAudrey A Kelleman
Jun 14, 2021·Journal of Equine Veterinary Science·Danielle Estanislau Coelho SilvaJosé Domingos Guimarães

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