Aśvamedha-yajñas or Gomedha-yajñas, sacrifices in which a horse or a bull is sacrificed, were not, of course, for the purpose of killing the animals. Lord Caitanya said that such animals sacrificed on the altar of yajña were rejuvenated and a new life was given to them. It was just to prove the efficacy of the hymns of the Vedas. By recitation of the hymns of the Vedas in the proper way, certainly the performer gets relief from the reactions of sins, but in case of such sacrifices improperly done under inexpert management, surely one has to become responsible for animal sacrifice. In this age of quarrel and hypocrisy there is no possibility of performing the yajñas perfectly for want of expert brāhmaṇas who are able to conduct such yajñas.
-Shrimad Bhagvatam Canto 1 Chapter 8 Verse 52, Translation and Purport

यस्यास्ति भक्तिर्भगवत्यकिञ्चना
सर्वैर्गुणैस्तत्र समासते सुरा: ।
हरावभक्तस्य कुतो महद्गुणा
मनोरथेनासति धावतो बहि: ॥ १२ ॥
All the demigods and their exalted qualities, such as religion, knowledge and renunciation, become manifest in the body of one who has developed unalloyed devotion for the Supreme Personality of Godhead, Vāsudeva. On the other hand, a person devoid of devotional service and engaged in material activities has no good qualities. Even if he is adept at the practice of mystic yoga or the honest endeavor of maintaining his family and relatives, he must be driven by his own mental speculations and must engage in the service of the Lord’s external energy. How can there be any good qualities in such a man?
-Shrimad Bhagvatam Canto 5 Chapter 18 Verse 12