File:Studies in horse breeding; an illustrated treatise on the science and practice of the breeding of horses (1910) (14776298262).jpg

Identifier: studiesinhorsebr01carl (find matches)
Title: Studies in horse breeding; an illustrated treatise on the science and practice of the breeding of horses
Year: 1910 (1910s)
Authors: Carlson, George Lloyd, 1854-
Subjects: Horses
Publisher: Norfolk, Neb., The author
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ood illustrations of the effect of airand even a shaded light. Figure 2 shows spermatozoaabout 30 minutes after they were discharged by thestallion. The bend or curve in the tails of all, is evi-dence of their mobility and vitality. Figure 3 showsspermatozoa from the same discharge about six hourslater. All showing with heads one way (from thelight) is evidence that the light was painful to them.As all are straight is evidence motion had about ceased.Very soon after death, they mysteriously disappear asa result of some unseen agency. Number of Spermatozoa In One Discharge The num-ber of spermatozoa in one discharge of a stallion isanywhere from 10,000 to 75,000, depending upon thesexual vigor of the stallion, and the frequency of ser-vice. A good vigorous stallion upon one service perday will discharge from 50,000 to 75,000 of them at one 20 STiDiES i.\ lioiiSK i;i!i:i:i)i.\ti disehaii^e. The amount of fluid discharged at each ser-vice of a stallion is fioni four to twelve ounces. The
Text Appearing After Image:
Figure 7. The genital organs of tiie stallion, shown fromthe right side: 1, right testicle; 2, 3, vas deferens; 4, seminalvesicle; 5, prostrate gland; 6, urethra; 7, Cowpers glands;9, fold of peritoneum; 10, vessels and nerves of left testiclecut off; 11, abdominal ring; 12, urinary bladder. less frequent the service, the larger the amount offluid, and the higher the number of spermatozoa. CONCEPTION 21 Jacks. Jacks do not discharge as much fluid as astallion, nor does this fluid contain as many sperma-tozoa. The spermatozoa of jacks are not as tenaciousof life, as those of stallions. Scientifically speaking,no jack is as sure a breeder as a sure stallion. This isespecially true when mated with mares, as the pro-ducing of hybrids is never as certain in the case of allanimal life, as when the mating is of one species. Thereis a widely distributed belief to the contrary, but it isan erroneous one. Because of their temperamental dif-ference, jacks make more complete service than stal-lio

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