## Core Concept
Bovine milk, or cow's milk, contains various types of immunoglobulins, which are crucial for providing immunity to calves. Immunoglobulins are proteins that function as antibodies. The main types of immunoglobulins found in bovine milk are IgG, IgA, and IgM.

## Why the Correct Answer is Right
The correct answer, **IgG**, is the predominant immunoglobulin in bovine milk, making up about 60-70% of the total immunoglobulins present. IgG is crucial for providing calves with passive immunity against infections. It is absorbed intact from the gut of newborn calves, providing them with protection against pathogens.

## Why Each Wrong Option is Incorrect
* **Option A:** While **IgA** is indeed present in bovine milk and plays a significant role in mucosal immunity, it is not the predominant immunoglobulin.
* **Option B:** **IgM** is also present but is not the major immunoglobulin in bovine milk. It is more involved in the primary immune response.
* **Option D:** This option is likely a distractor and does not correspond to a commonly recognized immunoglobulin.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the immunoglobulins in bovine milk, particularly IgG, are essential for the calf's initial immune defense. This is why colostrum, which is rich in immunoglobulins, is so critical for newborn calves to receive within the first few hours of life.

## Correct Answer: C. IgG.