Studies on the fertility of sheep in height

Authors

  • Mauricio San Martín Instituto de Biología Andina, Facultad de Medicina, Universidad Nacional Mayor de San Marcos, Lima, Perú
  • Jorge Atkins Instituto de Biología Andina, Facultad de Medicina, Universidad Nacional Mayor de San Marcos, Lima, Perú

DOI:

https://doi.org/10.15381/anales.v25i1.9705

Abstract

The author studies the semen of the rams in its known characteristics, and states the differences found at 4500 mts. of altitude. The very well know fact of reduced birth rate (50 to 60 % versus 100 % at sea level), is due to several factors : The deviations of pH are greater than at sea level. The number of spermatozoids is rather high, but there are young forms frequently seen, with a decrease of their mobility, as well as the presence of white blood cells, epithelial cells, etc. In fact he founds only 26 % of 58 supposedly normal rams, which could be considered suited for reproduction. By means of artificial insemination, and using selected males, he obtained 86,4 % of fertility, the result being very impressive as the ewes served were those so called "machorras" (infertiles). This paper proves, therefore, that the reduced birth rate of sheep at high altitude, is due to a diminishing ability of fecundation in the semen. The author gives suggestions for increasing fertility in high altitude rams. From the scientific as well as from industrial point of view, the results are very encouraging.

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Published

1942-07-15

Issue

Vol. 25 No. 1 (1942)

Section

Trabajos originales

License

Copyright (c) 1942 Mauricio San Martín, Jorge Atkins

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How to Cite

1.
San Martín M, Atkins J. Studies on the fertility of sheep in height. An Fac med [Internet]. 1942 Jul. 15 [cited 2024 Jul. 17];25(1):41-54. Available from: https://revistasinvestigacion.unmsm.edu.pe/index.php/anales/article/view/9705