It is talking about householders and the necessity of doing the Pancha Mahayajnas daily. For a householder it's stated that there are five slaughter houses in their home itself.
Manu 3.68. A householder has five slaughter-houses (as it were, viz.)
the hearth, the grinding-stone, the broom, the pestle and mortar, the
water-vessel, by using which he is bound (with the fetters of sin)
And to expiate the sins the five sacrifices are needed to be performed by a householder (Grihasta) on a daily basis.
3.69. In order to successively expiate (the offences committed by means) of all these (five) the great sages have prescribed for
householders the daily (performance of the five) great sacrifices.
3.70. Teaching (and studying) is the sacrifice (offered) to Brahman, the (offerings of water and food called) Tarpana the sacrifice to the
manes, the burnt oblation the sacrifice offered to the gods, the Bali
offering that offered to the Bhutas, and the hospitable reception of
guests the offering to men.
3.71. He who neglects not these five great sacrifices, while he is able (to perform them), is not tainted by the sins (committed) in the
five places of slaughter, though he constantly lives in the (order of)
3.72. But he who does not feed these five, the gods, his guests, those whom he is bound to maintain, the manes, and himself, lives not,
though he breathes.
3.73. They call (these) five sacrifices also, Ahuta, Huta, Prahuta, Brahmya-huta, and Prasita.
3.74. Ahuta (not offered in the fire) is the muttering (of Vedic texts), Huta the burnt oblation (offered to the gods), Prahuta
(offered by scattering it on the ground) the Bali offering given to
the Bhutas, Brahmya-huta (offered in the digestive fire of Brahmanas),
the respectful reception of Brahmana (guests), and Prasita (eaten) the
(daily oblation to the manes, called) Tarpana.
The Pancha Yagna (also known as Pancha Maha Yagna) are (quoting from this website):
- Deva Yagna (worship of Devas)
- Pitr Yagna (worship of ones forefathers)
- Bhuta Yagna (worship of other beings)
- Manushya Yagna (worship of fellow humans)
- Bramha Yagna (worship of knowledge)