Sperm

In this episode Alistair and Genna have empty heifers to deal with after their new bull delivers low pregnancy rates. Audio

New research reveals the role everyday items such milk cartons and painkillers play in declining sperm health. Infertility is a global health problem. It's estimated one in six couples have… Audio

Beltex ram lambs are making farmers around the country lick their chops. Known for its heavy hindquarters and excellent kill weights, the breed is the sheep industry's new kid on the butcher's block.

Human fathers put more time and energy into rearing their offspring than most other mammalian dads. Dr Lee Gettler is an anthropologist who focuses on fathering and the biology of fatherhood. He's… Audio

Falling sperm counts and changes to sexual development are barrelling us towards a fertility crisis according to Professor Shanna Swan. Audio

The tally of infertile eggs is climbing and the kākāpō team is using artificial insemination - and a drone - to try and counter the problem, in part 5 of Voice of the Kākāpō. Audio

In a world-first for kākāpō conservation, a drone (nicknamed the 'spermcopter') has flown kākāpō sperm across Whenua Hou / Codfish Island - the Kākāpō Files was there for episode 10. Audio

This week, ground-breaking research into how and why flamingoes can stand on one leg; why we tend to shun people who are sick; and the survival of human sperm in space. Audio

Bird sperm from native species such as robins, as well as introduced dunnocks from Dunedin, may shed light on problems with male fertility and infertile eggs. Video, Audio, Gallery