The Jewish calendar has both Lunar and Solar aspects, but is primarily Lunar. However, since the Solar year exceeds the Lunar year by 11.25 days, one month is added to the cycle of the calendar approximately every 3 year. Jewish holidays celebrate historical events of importance to the Jewish people and begin at sunset of the first day. Market weight is not as important as the animals health at slaughter. A Rabbi checks the animals to see if they are free of disease because animals must be in the best of health to be passed as Kosher.
Meat consumption tends to increase during all Jewish holidays.
The following three Jewish holidays are of particular importance. New years celebration lasts two days.