Giving large-volume drench quantities to freshly calved cows is now recommended and common practice in many dairy-producing countries.
Drench-Mate was developed in the USA and is widely used there, where 20+ litres of water generally with addition of a high-calcium, high-mineral, feed additive is fed to the cow via an oesophageal tube directly into the rumen. The system can also be used for down cows and sick / off feed animals.
The liquid is mixed in the Drench-Mate bucket (25L capacity) and the special oesophageal tube is inserted into the cow's mouth, right through to the rumen. The 3m-long (10ft) hose is marked at the 1.8m (6ft) point to indicate when the outlet will be at the correct location in the rumen. A special slip-tube and nose clamp is first inserted into the cow's mouth, to assist smooth entry of the oesophageal tube, and prevent the cow biting down on it. Once the tube is in place, the user then simply pumps the full volume of mix from the 25L bucket directly into the rumen. The pump gives 0.5 litres per stroke. This procedure - from insert to withdrawal of tube - should take 3-5 minutes. When completed, the tube is withdrawn, and the mouth tube unclamped and removed. This procedure is entirely without stress for the animal. The design of the tube and system makes miss-location into the lungs very unlikely. Full instructions are supplied, training the user to confirm correct tube placement. All Drench-Mate fittings are of brass, stainless steel, and other corrosion-resistant materials. Drench-Mate will withstand years of repeated use. See video demonstration "How to Drench a Cow" on: http://www.drenchmate.com/media/
Drench-Mate Drench is a vet only product but the system can be used with other drenches.