During which period is the digital cushion thinnest?

• A. Gestation
• B. Weaning
• C. Peak lactation
• D. Growth

Answer: (C)

The main idea is that the digital cushion thickness changes with energy balance and fat reserves in the cow. In peak lactation, a dairy cow’s energy demands for high milk production are at their highest, often causing a negative energy balance. To meet this demand, the body mobilizes fat from reserves, including the digital cushion, leading to thinning of this protective pad. A thinner digital cushion means less shock absorption for the pedal bone, increasing susceptibility to claw problems. So, peak lactation is when the cushion is thinnest. Growth typically involves fat accumulation, which can widen the cushion, while gestation and weaning don't drive the same depletion as peak lactation.