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Zinc and Iron Concentration of Sows' Milk

Cornell University, Ithaca, New York

Abstract

The zinc and iron concentration of sow milk was determined weekly during the first 3 weeks of lactation in 13 Yorkshire sows fed a corn-soybean meal-type diet with or without 1984 ppm of supplemental iron as ferrous fumarate. The average iron concentration of the milk from iron-supplemented and unsupplemented sows was 1.43 and 1.22 mg./ liter, respectively. There were no differences among weeks of lactation or among sows in concentration of iron in the milk. The average zinc concentration was 4.94 mg/kg. of fresh milk (24.9 mg./kg. of dried milk). There was a significant (P<.01) difference among sows and among weeks of lactation in concentration of zinc in the milk, but no effect of dietary iron level. Dry matter content was significantly (P<.01) different among sows. These data indicate that the addition of ferrous fumarate to the lactation diet of the sow is not an effective means of increasing the iron concentration of milk.

¹ Department of Animal Husbandry.

² Soil Scientist, U. S. Plant, Soil and Nutrition Laboratory, Ithaca, New York.

³ The authors gratefully acknowledge D. V. Catron and F. Diaz, Walnut Grove Products, Atlantic, Iowa, for supplying the ferrous fumarate and arranging for the iron analyses.

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