When I had my 1st chicks they grew like a normal chicks. But last year when I got some BR and I gave half to my friend then when they turned 10 weeks old I went to his house and his chicks were almost the size of a normal chicken while mine where not even half of a normal chicken!!! they could still fit in a whole that was about 2 1/2 inches long and 2 inches wide!!!! while my friends chickens their head could only fit through there!!!! since that day I've been raising chicks and they are growing slowly! today my friends BR are laying and mine are berly HALF size of a normal chicken and they're not laying!!! is there a virus that slows down the growing cycle??? please help me!! I want to raise chicks but everytime they don't grow!!!