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Nutritive Value of Garbage as a Feed for Swine. I. Chemical Composition, Digestibility and Nitrogen Utilization of Various Types of Garbage^{1, 2,}

New Jersey Agricultural Experiment Station, New Brunswick

Abstract

Proximate analysis and gross energy determinations were completed on 165 cooked garbage samples of four types collected approximately twice each month (day of the week rotated) from six garbage feeders over a period of 17 months. All types of garbage were low in dry matter content compared to commercial swine rations. Military garbage was highest in dry matter, ether extract and gross energy content, whereas institutional garbage was highest in NFE content and lowest in ether extract and gross energy content. Crude protein and crude fiber contents were not significantly different among the types, with the exception of municipal garbage, which had the highest content of these two components. A comparison of composition data of the present study with values reported by other workers indicates values among reports for the various types of garbage are similar. It was noted, however, that dry matter, ether extract and ash content differed more among the various studies than did crude protein and crude fiber content. Ether extract and crude fiber were the most variable components, and municipal garbage was the most variable type. Gross energy was the least variable component. Day of the week appeared to show little relationship to the chemical composition, whereas some small but significant differences due to season were observed.

Three digestion and N metabolism trials were conducted with swine using military, institutional and municipal garbages. Eight animals were used with military and institutional garbage and six with municipal garbage. The apparent digestion coefficients of crude protein, NFE, ether extract, and crude fiber from military and institutional garbage were considerably higher than those of typical grainmeal rations. Municipal garbage was less digestible, and apparent digestion coefficients obtained from the heavier pigs were lower than those from the lighter pigs. The calculated biological value of the proteins in military and institutional garbage was higher than in municipal garbage and similar to common protein constituents in swine rations.

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 and Miss Joan Nagy for help with chemical determinations.

³ Present address: Department of Animal Science, Purdue University, Lafayette, Indiana.

⁴ Present address: Kentucky Extension Service, Clinton, Kentucky.