**Core Concept**
The question is about **colostrum**, which is a form of milk produced by the mammary glands in late pregnancy and the first few days after giving birth. **Colostrum** is rich in **antibodies**, **proteins**, and other nutrients.

**Why the Correct Answer is Right**
**Colostrum** is indeed **rich in immunoglobulins**, which provide newborns with **passive immunity**. It also **contains more protein** compared to mature milk, which is essential for the newborn's growth and development.

**Why Each Wrong Option is Incorrect**
**Option A:** is incorrect because **colostrum** is secreted immediately after childbirth, not after 10 days.
**Option D:** is incorrect because **colostrum** actually **contains less fat** compared to mature milk.
**Option E:** is incorrect because the daily secretion of **colostrum** is more than 10 ml/day, although the exact amount can vary.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that **colostrum** provides **critical nutrients and immunity** to newborns, and its secretion is a key indicator of a successful lactation process.

**Correct Answer:** D. b, c, e