References

1. Olson, J.A. Vitamin A, 7th Ed.; International Life Sciences Institute: Washington, DC, 1996; 109 119.

2. Noy, N. Vitamin A. Biochemical and Physiological Aspects of Human Nutrition, 1st Ed.; W.B. Sanders Co.: Philadelphia, PA, 2000; 599 623.

3. Darroch, C.S. Vitamin A in Swine Nutrition. In Swine Nutrition, 2nd Ed.; CRC Press: New York, NY, 2000; 263 280.

4. NRC. Nutrient Requirements of Beef Cattle, 7th Rev. Ed.; Natl. Acad. Press: Washington, DC, 1996; 75 78.

5. NRC. Nutrient Requirements of Swine, 10th Rev. Ed.; Natl. Acad. Press: Washington, DC, 1998; 71 75.

6. Norman, A.W. Vitamin D, 7th Ed.; International Life Sciences Institute: Washington, DC, 1996; 120 129.

7. Holick, M.F. Vitamin D. In Biochemical and Physiologi cal Aspects of Human Nutrition, 1st Ed.; W.B. Sanders Co.: Philadelphia, PA, 2000; 624 639.

8. Crenshaw, T.D. Calcium, Phosphorus, Vitamin D and Vitamin K. In Swine Nutrition; CRC Press: New York, NY, 2000; 187 212.

9. Suttie, J.W. Vitamin K, 7th Ed.; International Life Sciences Institute: Washington, DC, 1996; 137 145.

10. NRC. Nutrient Requirements of Poultry, 9th Rev. Ed.; Natl. Acad. Press: Washington, DC, 1994; 15.

11. NRC. Nutrient Requirements ofDairy Cattle, 7th Rev. Ed.; Natl. Acad. Press: Washington, DC, 2001; 162 169.

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