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Postpartum follicular development in Brahman cows under two stocking rates.

Ivette Rubio1, Epigmenio Castillo, Rodolfo Soto

  • 1Centro de Enseñanza Investigación y Extensión en Ganadería Tropical Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Tlapacoyan, Veracruz, México. ivetterubio@gmail.com

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Summary

Stocking rate did not impact Brahman cow follicle dynamics in humid tropics. Body condition score (BCS) was the key factor influencing follicle numbers and sizes, regardless of grazing density.

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Area of Science:

  • Reproductive biology
  • Animal science
  • Tropical agriculture

Background:

  • Postpartum recovery and fertility are crucial for beef cattle productivity.
  • Follicular dynamics are key indicators of ovarian function and reproductive potential.
  • Understanding factors influencing follicular development is vital for optimizing breeding programs.

Purpose of the Study:

  • To investigate the effect of stocking rate on postpartum follicular population dynamics in Brahman cows.
  • To determine the relationship between body condition score (BCS) and follicular development in Brahman cows under different grazing pressures.
  • To assess the influence of tropical environmental conditions on ovarian function.

Main Methods:

  • Ovarian ultrasound scanning was used to measure follicle number and size in lactating Brahman cows (n=104).
  • Cows grazed native pastures under two stocking rates: high (2.8 cows/ha) and low (1.7 cows/ha).
  • Body condition score (BCS) was recorded, and animals in oestrus were removed for insemination.

Main Results:

  • Stocking rate did not significantly affect BCS or follicular dynamics.
  • Follicle populations shifted over time postpartum, with a decrease in small (<4 mm) and an increase in medium (5-8 mm) follicles.
  • A positive correlation was observed between BCS and small follicles (<4 mm), while a negative correlation existed with medium follicles (5-8 mm).

Conclusions:

  • Stocking rate has minimal impact on postpartum follicular population dynamics in Brahman cows in the Mexican humid tropics.
  • Body condition score (BCS) is the primary determinant of follicle number and size categories, irrespective of stocking rate.
  • Maintaining optimal BCS is crucial for supporting follicular development and reproductive potential in Brahman cattle.