Genetic Factors Influencing Sperm Competition

Factors influencing boar sperm cryosurvival.

Optimal sperm cryopreservation is a prerequisite for the sustainable commercial application of frozen-thawed boar semen for AI. Three experiments were performed to identify factors influencing variability of postthaw sperm survival among 464 boar ejaculates. Sperm-rich ejaculate fractions were cryopre-served using a standard freezing-thawing procedure for 0.5-mL plastic straws and computer-cont...

Genetic factors influencing alcohol dependence.

Plentiful data from both animal and human studies support the importance of genetic influences in substance abuse and dependence (Bierut et al., 1998; Tsuang et al., 1998; Kendler et al., 2003). This review summarizes the evidence supporting such genetic influences, places them into perspective regarding animal and human studies, discusses the importance of both genes and environment, and highl...

Sperm competition

The existence and evolutionary significance of sexual selection through sperm competition was first realized by Geoff Parker in a prescient and influential review published in 1970. Parker recognized that competition between males for fertilizations will continue after mating, if the sperm of two or more males overlap near the site of fertilization in females. The process of sperm competition w...

Genetic Factors Influencing BCG Vaccine Properties

Genetic factors influencing human serum trehalase activity.

Trehalase (EC Number 3.2.1.28; trehalose 1-glucohydrolase) is an enzyme which splits the disaccharide trehalose (1-a-D-glucopyranosyl-a-Dglucopyranoside) to glucose; and it is widely distributed in both plants and animals. It was first discovered by Bourquelot (1893) in Aspergillus niger and since then has been found in bacteria, fungi, yeast, the serum of certain fishes, and in insects (Kalf a...