embryoembryo transferembryologicalemulsifierendocrineendocrine glandendodermendogenousendogenous hormoneendometriumendoplasmic reticulumendothermicengulfedensilingenteric salmonellosisenterokinaseenvironmentenzootic ataxiaenzymeepididymisepinephrineepistasisepitheliumequal parent indexequilibriumequineerectionergosteroleructationescape gapesophageal grooveesophagusesteraseestrous cycleestrusethaneethanolether extraceukaryoteseuploideuropean breedseutectic pointevaporationevolutionexcitable membraneexogenousexogenous hormoneexternal pudendal arteryexternal pudendal veinexternal pudic artery