Female companions boost male fertility

Living with a female mouse can extend the reproductive life of a male mouse by as much as 20 percent, according to a study which scientists say has significant implications for the maintenance of male fertility in wildlife, livestock and even human populations.

The decline in fertility appeared to be due in part to defects in the sperm-production process. The change amounts to a reduction of fertility six months earlier in “lonely” mice as opposed to those who have female companionship.

While it is already recognized that reproductive aging of males includes decreased fertility, the factors that delay aging are largely unknown. Histological analysis indicated that abnormal spermatogenesis occurred sooner in isolated males, suggesting that defects in spermatogenesis may play a role in the greater decrease in fertility in isolated males. The researchers involved, from the University of Pennsylvania, hypothesize that the females’ effect on the environment of the male’s spermatogonial stem cells likely occurs through his endocrine and nervous systems.

“It appears that housing females with a male mouse delays the decline of reproductive processes at the cellular level by somehow affecting the cells surrounding the stem cells that produce spermatozoa in the testes,” said researcher Ralph Brinster, professor of physiology at Penn Vet. “Whether this female influence occurs in other species is not known.”

“If it turns out that this reproductive effect is mimicked in other species, for example, livestock animals that affect food production, then a 20 percent increase in male fertility could mean an extension of the male reproductive life span of years,” Brinster said. “This finding may also have relevance for the protection of some large endangered species.”

Related:
St Valentine’s Day Sperm Massacre
Researchers Investigate Giant Sperm Paradox
Rodent Sperm Cooperate For Success
Promiscuous Females Make For Competitive Sperm

Source: University of Pennsylvania

,

Comments are closed.

Large Genuine Ancient Himalayan Tibetan Longevity Etched Agate Dzi Football Bead picture

Large Genuine Ancient Himalayan Tibetan Longevity Etched Agate Dzi Football Bead

$300.00



Large Genuine Ancient Himalayan Tibetan Round Longevity Etched Agate Dzi Bead picture

Large Genuine Ancient Himalayan Tibetan Round Longevity Etched Agate Dzi Bead

$500.00



Authentic Ancient Etched Agate Longevity Dzi Bead in Perfect Condition picture

Authentic Ancient Etched Agate Longevity Dzi Bead in Perfect Condition

$800.00



Ancient Central Asian Etched Carnelian Longevity Dzi Bead with Pattern picture

Ancient Central Asian Etched Carnelian Longevity Dzi Bead with Pattern

$250.00



Mun Shou Famille Rose Jingdezhen Yellow Longevity Porcelain Plate 6

Mun Shou Famille Rose Jingdezhen Yellow Longevity Porcelain Plate 6"

$15.00



Natural Dragon Blood Quartz Crystal Carved Longevity Turtle Gemstone Energy Gift picture

Natural Dragon Blood Quartz Crystal Carved Longevity Turtle Gemstone Energy Gift

$4.04



CHINESE VINTAGE FIGURINE GOD OF LONGEVITY EXCELLENT CONDITION c1965  4-685 picture

CHINESE VINTAGE FIGURINE GOD OF LONGEVITY EXCELLENT CONDITION c1965 4-685

$28.00



Vintage Chinese Porcelain God of Longevity Shou Figure - 8.25” Tall picture

Vintage Chinese Porcelain God of Longevity Shou Figure - 8.25” Tall

$26.89



Authentic Ancient Etched Agate Longevity Dzi Bead in Perfect Condition picture

Authentic Ancient Etched Agate Longevity Dzi Bead in Perfect Condition

$500.00



Large Ancient Longevity Dzi Etched Agate Bead with 5 Stripes in Good Condition picture

Large Ancient Longevity Dzi Etched Agate Bead with 5 Stripes in Good Condition

$1000.00



Powered by WordPress. Designed by WooThemes