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Related Experiment Videos

High environmental temperature and humidity decrease oocyte quality in Bos taurus but not in Bos indicus cows.

A Rocha1, R D Randel, J R Broussard

  • 1Department of Animal, LSU Agricultural Center, Louisiana State University, Baton Rouge 70803, USA.

Theriogenology
|March 25, 2000
PubMed
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High heat and humidity negatively impact bovine oocyte quality and embryo development in Bos taurus cows. Bos indicus cows, however, show resilience to seasonal temperature changes, maintaining oocyte quality and developmental potential.

Area of Science:

  • Reproductive Biology
  • Animal Science
  • Environmental Physiology

Background:

  • Environmental temperature and humidity are critical factors influencing livestock reproduction.
  • Bos taurus and Bos indicus cattle exhibit different adaptations to thermal stress.
  • Oocyte quality is a key determinant of successful embryonic development.

Purpose of the Study:

  • To evaluate the impact of environmental temperature and humidity on bovine oocyte quality.
  • To assess the effect of season on the in vitro developmental capabilities of oocytes from different cattle breeds.
  • To compare the resilience of Bos taurus and Bos indicus oocytes to seasonal environmental changes.

Main Methods:

  • Two experiments involving follicle aspiration from Bos taurus and Bos indicus cows during hot and cool seasons.

Related Experiment Videos

  • Oocyte morphological assessment for normality based on ooplasm and cumulus cell layers.
  • In vitro maturation, fertilization, and embryo culture for 8 days.

    • Main Results:

    • Bos taurus cows produced significantly fewer normal oocytes and lower embryo developmental rates during the hot season compared to the cool season.
    • Bos indicus (Brahman) cows showed no significant difference in oocyte normality or embryo development between seasons.
    • High environmental temperature and humidity markedly reduced oocyte quality and in vitro developmental potential in Bos taurus.

    Conclusions:

    • High environmental temperatures and humidity negatively affect oocyte quality and developmental capacity in Bos taurus cattle.
    • Bos indicus cattle demonstrate a higher tolerance to seasonal environmental variations concerning oocyte quality and embryo development.
    • Breed-specific differences are crucial in understanding bovine reproductive responses to climate change.