Feed Intake with Adjustments of the Maintenance Energy Requirement - Lactating Goats
We will use a 50-kg dairy goat with 0 average daily gain (ADG) producing 3 kg of milk with 3.5% fat and consuming a diet with a ME concentration of 11 MJ/kg dry matter. This results in a predicted dry matter (DM) intake of 2.08 kg.
However, if the maintenance energy requirement is adjusted for a grazing factor of 1.13 (grazing plus walking time = 7 hours; distance traveled = 4 km; terrain score = 2), then predicted DM intake is 2.19 kg.
If the maintenance energy requirement is also modified for an acclimatization adjustment of 0.16 MJ (average daily temperature for the previous 30 days = 18 degrees C; mid-point temperature of the thermoneutral zone = 20 degrees C), predicted DM intake becomes 2.21 kg.
The sources used in this calculation method are:
Luo, J., A. L. Goetsch, I. V. Nsahlai, J. E. Moore, M. L. Galyean, Z. B. Johnson, T. Sahlu, C. L. Ferrell, and F. N. Owens. 2004. Voluntary feed intake by lactating, Angora, growing and mature goats. Small Ruminant Research 53:357-378.
Nsahlai, I. V., A. L. Goetsch, J. Luo, Z. B. Johnson, J. E. Moore, T. Sahlu, C. L. Ferrell, M. L. Galyean, and F. N. Owens. 2004. Metabolizable energy requirements of lactating goats. Small Ruminant Research 53:253-273
Sahlu, T., A. L. Goetsch, J. Luo, I. V. Nsahlai, J. E. Moore, M. L. Galyean, F. N. Owens, C. L. Ferrell, and Z. B. Johnson. 2004. Nutrient requirements of goats: developed equations, other considerations and future research to improve them. Small Ruminant Research 53:191-219.