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| 2 | 2. Nutrient Requirements of Dairy Cattle: Seventh Revised Edition, 2001. p: 258-315 |
| 3 | 3. W. J. Miller and Tony J. Cuhna Dairy Cattle Feeding and Nutrition. ISBN: 978-0-12-497650-4 |
| 4 | 5. NRC, 2007: Nutrient Requirements of Small Ruminants: Sheep, Goats, Cervids and New World Camelids, National Academy Press, Washington, DC, 2007. |
| 5 | 6. Nutrient Requirements of Beef Cattle: Seventh Revised Edition: Update 2000 ISBN: 0-309-59241-0, |