HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Van Dyke, N. J. Articles by Hill, D. T. Search for Related Content PubMed PubMed Citation Articles by Van Dyke, N. J. Articles by Hill, D. T.

Digestibility and Utilization of Energy and Protein in Screened Swine Waste Solids by Gestating Gilts¹

Auburn University, AL 36849

Abstract

Two balance experiments were conducted using 24 gestating gilts in each experiment to determine the apparent digestible and metabolizable energy content, apparent digestible protein content, net protein utilization and apparent biological value of screened swine waste solids (SSWS). Waste solids were collected by screening flushed whole swine waste using a vibrating screen separator. Waste solids containing 30% dry matter were collected daily and mixed with a basal diet. In Exp. 1, SSWS were fed at a level estimated to replace 0, 25, 50 or 86% of the metabolizable energy content of the basal diet. Digestibility of the energy in the total diet decreased quadratically (85.2, 70.2, 60.7 and 58.3%, respectively, P<.0001) with increasing SSWS. The percentages of gross energy supplied by SSWS that were digested and metabolized, as calculated by difference, were not affected significantly by the amount of SSWS fed (48.0, 48.0, 53.2% digested and 45.1, 45.2, 48.1% metabolized, respectively, for 25, 50 and 86% of gross energy intake from SSWS). The mean digestible and metabolizable energy contents of SSWS for gestating gilts were determined to be 1,998 and 1,854 kcal/kg dry matter. In Exp. 2, gilts were fed SSWS to replace 0, 25 or 50% of the crude protein in the basal diet. Apparent digestibility of the protein in the total diet decreased linearly (83.8, 66.1 and 51.1%, respectively, P<.0001) as the amount of SSWS in the diet increased. The apparent digestibility of the crude protein in SSWS, as calculated by difference, was –4.23 and 10.1% for the 25 and 50% level of replacement. The average net protein utilization and apparent biological value for the two levels of inclusion were –30.8 and –18.6%. Results of these experiments indicate that SSWS as collected in this study can serve as an energy source in the diets of gestating gilts but is of negligible value as a protein source.

¹ Contribution of the Alabama Agr. Exp. Sta, Journal Series No. 4-85853.

² Dept. of Anim. and Dairy Sci.

³ Dept. of Agr. Eng.