Rig Veda Book 10 hymn 86, verse 13 - indra will "eat thy bulls", thy dear oblation that effecteth much. Supreme is Indra over all
Rig VEDA Book 10 hymn 85 and verse 13 - 13. The bridal pomp of Surya, which Savitar started, moved along.In Magha days are "oxen slain", in Arjuris they wed the bride.
Rig Veda Book 10 hymn 16 verse 10 - I choose as god for Father-worship Agni, "flesh eater", who hath past within your dwellings
It's time to understand the the Rig Vedas is not taken in Literal meaning as it is a collection of hymns written in cryptic language that years of study is required to truly understand its meaning.
A bull represented farming and harvests. Hence Indra, lord of rain has the power to control harvests thus "eat thy bulls"
Agni is fire, And naturally fire has the ability to be a "Flesheater"