What's the difference between stallion and stillion?

Stallion

Definition:

(n.) A male horse not castrated; a male horse kept for breeding.

Example Sentences:

(1) in horses is imputed to the small numbers of people involved in the work, to the conservation of the authorities responsible for breeding, to the wrong choice of stallions for A.I.
(2) Detection of estrus in mares is problematic in that it requires the presence (or at least facsimile acoustic or tactile stimuli) or a stallion.
(3) Similar to other seasonal breeders, it appears that stallions may possess an endogenous circannual rhythm in reproductive function that is subject to manipulation by altering the light:dark ratio, i.e., photoperiod.
(4) It's so magnificent, like the swishing mane of a thoroughbred stallion … Too late, snip snip, off it comes.
(5) A 10-year-old Appaloosa stallion was referred for evaluation of colic.
(6) Ultrasonographic images of the accessory sex glands of 8 stallions were recorded immediately prior to sexual preparation, immediately after sexual preparation, and immediately after ejaculation.
(7) Hormonal effects of prolonged administration of gonadotrophin-releasing hormone (GnRH) were investigated in 7 fertile stallions in winter and summer.
(8) It was concluded, therefore, that hydrogen ion extenders depress fertilizing capacity of stallion spermatozoa immediately after extension and show little promise as semen extenders for short- or long-term storage of stallion semen.
(9) The spermatozoa in about 200 ejaculates from 36 stallions were examined to compare their survival time, motility and velocity before and after thawing.
(10) Repeated bacteriological examinations need to be undertaken before it can be concluded that a stallion is free of infection.
(11) Chapter 1: imagine your hopes and dreams are a galloping stallion, wild and untamed.
(12) It is concluded that intratesticular testosterone increases with age, is related in a positive manner to quantitative rates of sperm production, and can account for some of the differences in sperm production among individual stallions within a single breeding season.
(13) Four pony mares were readily infected with the organism of contagious equine metritis by intracervical inoculation and one by coitus with an infected stallion.
(14) Only in the oldest stallion (32 years) was there a significant lowering of fertility.
(15) Among 29 offspring in two stallion families there was evidence for one recombinant.
(16) Stallions may also harbor EAV in the genital tract and transmit the virus to mares during coitus.
(17) In the bull and ram, nucleolytic enzymes were found to be secreted by the seminal vesicles but in the boar, rabbit and stallion they originate mostly from the epididymis.
(18) The application of a long-day photoperiod (16 hours light:8 hours dark) in December, following 20 weeks of short days (8 hours light:16 hours dark), was effective in hastening the seasonal sexual recrudescence of stallions but was not effective in prolonging the interval of heightened reproductive capacity.
(19) A Thoroughbred stallion with erectile dysfunction following paraphimosis was managed to allow consistent ejaculation.
(20) Transmission of EAV infection by long-term carrier stallions would appear to occur solely by the venereal route.