Jaiminīya (Talavakāra) Brāhmaṇa 1.67

1.67

na kā cana dvādaśamatiharati
parigṛhītā hi tena
tāsāṃ parigṛhītānāmaśvataro'tyapravata
tasyānuhāya reta ādatta
tadgardabhe nyamārṭtadbaḍabāyāṃ tatpaśuṣu tadoṣadhīṣu
tasmādgardabho dviretāstasmādbaḍabā dviretāḥ
tasmātpaśavo dvau dvau janayanti
tasmādoṣadhayo'nabhyaktā rebhanti
tasmādaśvataro barhiṣi na deyaḥ
ati hyaplavatāpa hyakrāmat
āttaretā hyaprajā hi
ṣoḍaśinasstotre deyaḥ
atirikto vai ṣoḍaśi stotrāṇāmatirikto'śvataraḥ paśūnām
atirikta evā tadatiriktaṃ dadhati yajñasya salomatāyai
sa ya evaṃ vidvānagniṣṭomenodgāyati prājātāḥ prajā janayati pari prajātā
gṛhṇāti
jyeṣṭhayajño vā eṣa prajāpatiyajño yadagniṣṭomaḥ
aśnute jyaiṣṭhyaṃ śraiṣṭhyaṃ ya evaṃ veda

None exceeds the twelfth,
for they are enclosed by it.
While they were being enclosed, a mule bounded out.
Running after it, he took its seed.
He rubbed it onto a donkey, onto a mare, onto cattle, onto plants.
Therefore the donkey has double seed; therefore the mare has double seed;
therefore cattle give birth to two each;
therefore plants crackle when not anointed [with oil].
Therefore a mule is not to be given on the sacrificial grass,
for it bounded over, it stepped aside;
for its seed has been taken away, for it is barren.
It is to be given at the chant of the Ṣoḍaśin.
The Ṣoḍaśin is an addition among the chants; the mule is an addition among animals.
They place the redundant into the redundant, for the smoothness of the sacrifice.
He who, knowing thus, chants as Udgātṛ with the Agniṣṭoma generates procreated offspring and encloses the procreated offspring.
This Agniṣṭoma is indeed the sacrifice of the eldest, the sacrifice of Prajāpati.
He attains seniority and supremacy who knows thus.