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Infertility in Males

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Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...

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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

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Decrease of fertility in a broiler breeder flock due to testicular atrophy.

Rocio Crespo¹, H L Shivaprasad

¹California Animal Health and Food Safety Laboratory System-Fresno Branch, University of California, Davis, 2789 South Orange Avenue, Fresno, CA 93725, USA.

|April 23, 2010

Summary

This summary is machine-generated.

A study found that introducing new males (spiking) and poor farm conditions like wet litter led to decreased broiler breeder fertility. This was linked to weight loss, testicular atrophy, and reduced sperm production in males.

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Area of Science:

Avian reproduction
Poultry health management

Background:

Broiler breeder flocks are crucial for meat production.
Maintaining optimal fertility and hatchability is economically important.

Purpose of the Study:

To investigate the cause of decreased fertility in a broiler breeder flock.
To identify factors contributing to reduced reproductive performance.

Main Methods:

Necropsy and histopathological examination of male breeder birds.
Evaluation of farm environmental conditions and feed intake.
Correlation of findings with flock fertility and hatchability data.

Main Results:

Fertility decreased from 96% to 82% after male spiking.
60% of necropsied males showed severe testicular atrophy with no spermatogenesis.
Poor environmental conditions (wet litter) and decreased feed consumption were noted.
No infectious agents were identified as the cause.

Conclusions:

A combination of new male introduction, poor environmental conditions, and reduced feed intake caused weight loss and testicular atrophy.
These factors collectively led to decreased spermatogenesis and flock fertility.
Environmental management and nutritional monitoring are critical for maintaining broiler breeder reproductive success.