Sperm competitiveness in frogs: slow and steady wins the race.

Slow and steady wins the race? No signs of reduced welfare in smallerbroiler breeder hens at four weeks of age

The tortoise wins only when the race is long: How the task environment changes the behavior of Tetris models

Tetris can be viewed as a highly complex decision making task, and used as a paradigm for studying human expertise. We hypothesized that models capable of playing Tetris for a long time are doing so by adopting slow but steady strategies to accumulate points, while human players are much more prone to using high-risk, high-reward strategies that earn more points in a shorter time frame. This wo...

P-74: Cytochemical Evaluation of Sperm Chromatin and DNA Integrity in Couples with 3 Unexplained Recurrent Spontaneous Abortion

Background: The aim of this study was to examine the possible relationship between sperm DNA integrity and chromatin packaging evaluated by cytochemical assays, traditional sperm parameters and recurrent spontaneous abortion (RSA) of unknown origin. Materials and Methods: In this cohort study, 40 couples with a history of RSA and 40 couples with proven fertility were considered as case and cont...

بررسی اثر دوزهای مختلف آدنوزین بر پارامتر تحرک اسپرم مردان نابارور

Background and objective: One of the causes of male infertility is the lack of proper mobility. One way to deal with this problem is to add adenosine to human sperms in the laboratory. Therefore, this study aimed to determine the effect of different doses of adenosine on sperm motility in the ejaculates of fertile and infertile individuals. Materials and Methods: In this experimental laboratory...

Maternal effects, but no good or compatible genes for sperm competitiveness in Australian crickets.

Explanations for the evolution of polyandry often center on the idea that females garner genetic benefits for their offspring by mating multiply. Furthermore, postcopulatory processes are thought to be fundamental to enabling polyandrous females to screen for genetic quality. Much attention has focused on the potential for polyandrous females to accrue such benefits via a sexy- or good-sperm me...