# Effect of oil-enriched tomato powder and simvastatin on yolk cholesterol and color in laying hens

## TL;DR

This study found that adding 18% oil-enriched tomato powder to laying hens' diets improves yolk color and reduces cholesterol, with simvastatin being more effective for cholesterol reduction.

## Contribution

The study demonstrates that 18% oil-enriched tomato powder and simvastatin can improve egg yolk quality in hens.

## Key findings

- Dietary OTP at 18% significantly enhanced the yolk color index.
- Both 18% OTP and simvastatin reduced yolk cholesterol levels.
- Hen performance metrics were unaffected by the treatments.

## Abstract

This study was conducted to investigate the influence of varying levels of oil-enriched tomato powder (OTP) and simvastatin supplementation on the performance and egg quality of laying hens.

Two hundred 32-week-old Lohmann–Brown hens were utilized in this study and divided into five groups: T1 = control diet; T2 = control diet + 0.03% simvastatin; T3 = 6% OTP in diet; T4 = 12% OTP in diet; and T5 = 18% OTP in diet.

The treatments with different levels of OTP and simvastatin had no significant effect on the performance of laying hens (p > 0.05), including egg weight, egg mass, hen-day egg production (HDEP), feed intake, and feed conversion ratio. However, dietary OTP at T5 significantly enhanced the yolk color index (p < 0.05) compared with treatments T1, T2, T3, and T4. Dietary OTP in T5 and supplementation of simvastatin at T2 significantly reduced (p < 0.05) cholesterol level in egg yolk, with the lowest cholesterol level produced by treatment T2.

Dietary inclusion of 18% OTP in the diet improves yolk color index and reduces cholesterol without affecting laying hen performance, though simvastatin is more effective in cholesterol reduction.