Whoever Perfoms Vrishotsarga on Pournami or Amavasya of Karthika month, All his Desires get Fulfilled & his Ancestors Attain Higher Realms.
👉Source:
यः कोवास्मत्कुले जातः पौर्णमास्यांतु कार्तिके
उत्प्रुजे वृषभं नीलं तेन तृप्ता वयं त्विति।
कांक्षन्ति नृपशार्धूला पूनीलोक स्थिथा अपि
Padma Purana chapter 14, Vashishta janaka samvadam

Precious Highly Significant & Extremely Unique Benefits attained by Performing Vrishotsarga, Cannot be Attained by Any other Yagya or Dana
👉Source:
अग्निहोत्रादिभिर्यज्ञैर्दानैश्च विविधैरपि न तां गतिमवाप्नोति वृषोत्सर्गेण या गतिः
-Garuda Purana 14-15