While a pain, both time-wise and financially, de-beaking could be your only option for this problem. It's easiest to de-beak birds when they are chicks because their beaks are softer. So, if your chickens pecking each other is a serious problem in your coop, take the necessary measures to stop it and solve the problem.
The starting salary is the amount of money your employer will compensate you during your first days, weeks or months of employment. There is no law regarding how soon after you begin employment that your employer must give you a raise.
Salary is what people pay you to do a job. So, mean annual salary means the average amount someone gets in a year. It also implies data for more than one year, and some fluctuations. Mean = average so the mean annual salary would be the average of everyone that worked in that position. Not everyone is making 50,000 in that position at that career level but the average is 50,000. You might make slightly more or slightly less than the mean average salary.