questions: asked about vaccination schedule for chicken 
 answers: ????? ??? ? ???? ?? ??????  ????? (marek disease) ???? ??? ???, ? ???? ?? ????  ???, i b  d   ?????????????  ???????? ????? ?? ???? ???. ?? ???? ????????? ??????? ????????  ????? ????? ??? . ?? ???? ???? ????? ???? i b  d   ?????????????