Have been a A.I. tech for 25 years and have been using g6g since it's inception after finding an article in the Veterinarian's Dairy Science Journal back in late 2006. It is by far the most consistent repro program available. In the herds where i utilize G6G my 1st service preg rates run between 57 and 59%. The highest of all my herds. Shout out to Dr Pursley and Dr Nora Bello for bringing this research to the fore front.
+Roberta Gallant - Only primates and humans menstruate. Dairy cows, pigs, dogs, and other domestic animals do not menstruate. They undergo oestrous. Cows cycle about every 21 days or so.