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Nutritive Value of Garbage as a Feed for Swine. II. Mineral Content and Supplementation^{1, 2,}

New Jersey Agricultural Experiment Station, New Brunswick

Abstract

The content of Ca, P, Cu, Fe, Mg and Mn was determined for composited garbage samples collected over a period of 1 year. Compared with swine mineral requirement standards, cooked garbages, with the exception of municipal garbage, were deficient on a dry matter basis in Ca, and all garbage types were somewhat deficient in P and Mn. Cu, Fe and Mg in cooked garbages were present at levels above requirements. The Ca content of municipal garbage was significantly higher than that of other garbages. The only significant difference between seasons existed in the Fe content, which was lower in the winter than in the other seasons.

Feeding trials using rats were conducted to study the effect of mineral supplementation of dried and wet garbages on gain and bone mineralization. Results from these trials confirmed observations made from the mineral composition analysis and indicate that institutional garbage is the type most deficient in Ca and P, that the nutritive value of municipal garbage is improved by the addition of P, and that hotel and restaurant and military garbages are only slightly deficient in Ca and P.

A feeding trial with Ca- and P-deficient swine was conducted to determine whether beef shinbones, pork ham and neck bones, turkey bones and eggshells could be used to supply minerals. Gain, feed efficiency, bone mineralization and serum Ca levels demonstrated the inability of pigs to consume and therefore use to any extent Ca and P from bones. The pigs were able to use eggshells to satisfy part of their Ca requirement.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers—The State University, New Brunswick, N. J.

² Appreciation is expressed to F. J. Bielk for help with chemical determinations.

³ Present address: Department of Animal Sciences, University of Tennessee, Knoxville, Tenn

⁴ Analyses were performed by Law and Company, Atlanta, Ga.