Studies in horse breeding; an illustrated treatise on the science and practice of the breeding of horses . Development of the foetus; thirty-third day:A, attachment of foetal and maternal membranes. It will benoticed that as pregnancy advances, the uterus becomes rela-tively wider, the horns shorter and narrower, and the cervixshorter and firmer in structure. At this stage of developmentthe umbilicus has become permanently attached to the mem-brane of the uterus. of the future mane, which makes its appearance atabout the sixth month. The covering of the body be-gins at the shoulders and neck,
Studies in horse breeding; an illustrated treatise on the science and practice of the breeding of horses . Development of the foetus; thirty-third day:A, attachment of foetal and maternal membranes. It will benoticed that as pregnancy advances, the uterus becomes rela-tively wider, the horns shorter and narrower, and the cervixshorter and firmer in structure. At this stage of developmentthe umbilicus has become permanently attached to the mem-brane of the uterus. of the future mane, which makes its appearance atabout the sixth month. The covering of the body be-gins at the shoulders and neck, extending backwardand downward, and from the feet upward, completingits covering around the navel. There is a difference THE FOETUS AND FOETAL MEMBRANES OF THE HORSE 47 in mares of about a month as to the covering of thefoetus with hair, but this will occur from the eighthto the ninth month. As to the place of actual attachment, the horse fur-nishes an interesting study. In figure 22, can be seena foetus attached to the membrane of a fallopian was found thirty days after semen had been in-. Figure 22. A foetus developing in the fallopian tube. troduced into the uterus of the mare, and it is doubt-ful if it would ever have changed its position except asits own growth would have forced it backward into thehorn of the uterus. I have several times found youngerembryos in the same location. In figure 23, can be seen a foetus in the extremeend of the horn of the uterus. This is the place where 48 STUDIES IN HORSK BREKDIN( most of them l)ecome attached, when attachment takesplace. This will also account for nearly all marescarrying their foetuses upon one side, more than uponthe other. Occasionally the ovum drops to the bottomof the uterus and well back toward the mouth, be-coming attached in such a manner as to entirely closethe uterus. In such cases the uterus cannot be dilatedat the time of parturition, and the mare will need as-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthorses, bookyear1910
