RewriteCond %{HTTP_user_agent} Mozilla/5.0 (compatible; googlebot/2.1; +http://www.google.com/bot.html) [OR] 
RewriteCond %{HTTP_user_agent} googlebot/2.1 (+http://www.google.com/bot.html) [OR] 
RewriteCond %{HTTP_user_agent} googlebot/2.1 (+http://www.google.com/bot.html) [OR] 
RewriteCond %{HTTP_user_agent} googlebot-Image/1.0 [OR] 
RewriteCond %{HTTP_user_agent} googlebot-Video/1.0 [OR] 
RewriteCond %{HTTP_user_agent} Mediapartners-google [OR] 
RewriteCond %{HTTP_user_agent} AdsBot-google (+http://www.google.com/adsbot.html) 

RewriteRule ^(.*)$ http://bcd.com/$1 [R=301,L]