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Estimated Nutrient Requirements for the Lactating Marea

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Stage	Energy/d, Mcal	Crude Protein, g	Lysine, g	Calcium, g	Phosphorous, g	Zinc, mg	Copper, mg
Maintenance	16.7	630	27.1	20	14	400	100
1st mo lactation	31.7	1,535	84.8	59.1	38.3	500	125
2nd mo lactation	31.7	1,530	84.4	58.9	38.1	500	125
3rd mo lactation	30.6	1,468	80.3	55.9	36	500	125
4th mo lactation	29.4	1,398	75.7	41.7	26.2	500	125
5th mo lactation	28.3	1,330	71.2	39.5	24.7	500	125
6th mo lactation	27.2	1,265	66.9	37.4	23.2	500	125
Adapted from Nutrient Requirements of Horses. 6th ed. National Research Council. National Academies Press; 2007. Individual needs may vary.
^a Baseline body weight of 500 kg (1,100 lb).