Early efforts to predetermine the sex of lambs used low doses of freshly sorted ram sperm that were surgically deposited directly into the uteri of estrous-synchronized ewes.[8] Pregnancy rates were low, but demonstrated that live lambs could be produced with sex-sorted ram sperm. Recent trials in Australia with sex-sorted ram sperm resulted in pregnancy rates of 25% for ewes inseminated with 4 x 106 X-sorted sperm and 15% for Y-sorted sperm. Control inseminations with 140 x 106 cryopreserved, thawed sperm yielded 54% pregnant ewes.[15] In this trial, thawed sperm were deposited either by standard laproscopic methods or placed into the uterotubal junction with a catheter after minilaparotomy. It is likely that pregnancy rates with sexed sperm could be improved by increasing sperm/dose and precisely controlling the time of insemination relative to ovulation.

Pregnancy Nutrition

Pregnancy Nutrition

Are You Expecting? Find Out Everything You Need to Know About Pregnancy and Nutrition Without Having to Buy a Dictionary. This book is among the first books to be written with the expertise of a medical expert and from the viewpoint of the average, everyday, ordinary,

Get My Free Ebook

Post a comment