Worldwide tonnes of CO2 eq emitted by animal agriculture and other sectors since you opened this page:

222,016 beef
189,358 dairy cattle
59,441 pigs
54,992 buffalo
54,458 chickens
45,585 other animals

628,852 total by animal agriculture
107,602 total by transportation*
192,147  total by electricity generation*
304,442 total by all other human activities*

* emissions not related to animal agriculture

Sources :                                                                         Livestock and Climate Change, by Robert Goodland and eff Anhang, 2009 
Tackling Climate Change through Livestock, FAO of the United Nations, 2013