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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Relationship between anti-Müllerian hormone concentration and antral follicle count in Colombian creole cows of the Chino Santandereano breed.

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Oocyte quality in adapted Bos taurus taurus cows.

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Ultrasound-guided follicular aspiration in Chino Santandereano cows yielded 7.9 oocytes per session, with a 64.9% recovery rate. The study found a higher percentage of grade III oocytes, indicating potential for this reproductive technique in the breed.

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Area of Science:

  • Veterinary Medicine
  • Reproductive Biology
  • Animal Science

Background:

  • The Chino Santandereano is a creole cattle breed native to the Santander region of Colombia.
  • Assessing reproductive efficiency in tropical breeds is crucial for genetic improvement programs.

Purpose of the Study:

  • To evaluate the efficacy of ultrasound-guided follicular aspiration (OPU) in Chino Santandereano cows.
  • To determine the quality of oocytes retrieved using the OPU technique in this breed.

Main Methods:

  • Fifteen multiparous Chino Santandereano cows were subjected to five OPU sessions every 45 days.
  • Oocyte recovery rates and viability were assessed.
  • Oocyte quality was categorized into grades I, II, and III.

Main Results:

  • An average of 7.9 ± 0.7 oocytes were recovered per cow per session.
  • The oocyte recovery rate was 64.9% ± 0.5.
  • Oocyte viability was 64.3% ± 0.6, with 35.7% ± 0.7 being non-viable.
  • Significant differences (P<0.05) were observed in oocyte quality grades: 7.7% ± 0.4 (Grade I), 19.8% ± 0.5 (Grade II), and 36.8% ± 0.5 (Grade III).

Conclusions:

  • Chino Santandereano cows demonstrate potential for the OPU technique.
  • The OPU technique resulted in a higher proportion of grade III oocytes in this breed.
  • Further research may optimize OPU protocols for improved oocyte quality and yield in Chino Santandereano cattle.