Effect of Soybean (Glicine max, Merrill) Seed Epidermis in Complete Diet on Protein Content and In Vitro Gas Production Test Parameters
Marjuki, A.N. Huda, R. Damayanti, Hartutik

Faculty of Animal Science, Universitas Brawijaya, Malang, Indonesia

Abstract

This study aimed to evaluate nutrient contents, in vitro gas production, digestibility, and microbial protein synthesis of complete feed containing concentrate feed with different levels of soybean (Glicine max, Merrill) seed epidermis. The soybean seed epidermis was collected as waste of local tempe industry. This experiment used randomized block design of four treatments and three blocks as replication. The treatments were P0=complete feed composed of 50% elephant grass+50% concentrate- P1=50% elephant grass+40% concentrate+10% soybean seed epidermis- P2=50% elephant grass+30% concentrate+20% soybean seed epidermis- and P3=50% elephant grass+20% concentrate+30% soybean seed epidermis. The results showed that the increase of soybean seed epidermis use in the complete feeds decreased gradually and slightly CP content of the complete feeds from 13.7 to 13.6, 12.3, and 11.4% DM, decreased significantly CP degradability from 45.5 to 43.5, 36.3, and 29.9%, as well as efficiency of rumen microbial protein synthesis from 40.6 to 33.8, 31.3, and 27.3g microbial N/kg rumen fermented OM (RFOM) for P0, P1, P2, and P3, respectively. However, the respective treatments increased significantly total in vitro gas production and RFOM from 67.20 to 84.33 ml/500mg sample DM and from 260.7 to 358.56 g for P0 to P3, respectively. Thus for economic reason, if soybean seed epidermis should be used to substitute concentrate feed in the complete feed, hence the highest rate of substitution would be 20% (P2) that showed mostly parameters that were no significantly different form P1, but the parameters in both treatments are significantly lower than P0.

Keywords: Soybean, Epidermis, Complete feed, Concentrate, Gas production

Topic: Feed Resources, Sustainable Production and Animal Nutrition