What does Draft Oxen do in AoE3?

Sanga Cattle: building rate set to 1; Zebu Cattle: building rate set to 1; Big Benny: building rate set to 1. The game says: "Enables African Cattle to construct Fields and slowly gather resources from them."

Home City card

Draft Oxen

Draft Oxen (tech ID DEHCDraftOxen) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 2 civilizations, sent from the Discovery Age. Effect: Sanga Cattle: building rate set to 1; Zebu Cattle: building rate set to 1; Big Benny: building rate set to 1.

Quick answers (3)

Which civilizations have the Draft Oxen card?: Ethiopians and Hausa.
What does Draft Oxen do in AoE3?: Sanga Cattle: building rate set to 1; Zebu Cattle: building rate set to 1; Big Benny: building rate set to 1. The game says: "Enables African Cattle to construct Fields and slowly gather resources from them."
What is the tech ID of Draft Oxen?: DEHCDraftOxen.

Enables African Cattle to construct Fields and slowly gather resources from them.

What it does

Sanga Cattle: building rate set to 1
Zebu Cattle: building rate set to 1
Big Benny: building rate set to 1

9 further effects (interface, visuals or AI) not listed.

Cost: 1
Sent from: I
Times it can be sent: 1
Game ID: DEHCDraftOxen

In these decks

EthiopiansI×1

HausaI×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).