Nutritive value of silkworm pupae for ruminants.

Publikations-Art

Kongressbeitrag

Autoren

Ioselevich, M., Steingaß, H., Rajamurodov, Z., Drochner, W.

Erscheinungsjahr

2004

Veröffentlicht in

116. VDLUFA Kongress

Herausgeber

VDLUFA

Verlag

VDLUFA , Bonn

Serie/Bezeichnung

VDLUFA-Kongress

Seite (von - bis)

108

Tagungsname

Qualitätssicherung in landwirtschaftlichen Produktionssystemen

Tagungsort

Rostock

Tagungsdatum

13.-17.09.2004

Schlagworte

nutritive value, ruminants, Silkworm

Silkworm pupae (SWP) is the dried residue of Bombyx mori pupae after removal of the silk thread. To describe its nutritive value for ruminants, various chemical, in vitro, in situ and in vivo methods were carried out. Crude nutrient composition is marked by a high content of CP and EE (as g/kg DM: TA: 33, CP: 568, EE: 315, CF: 58, NDF: 393, ADF: 124, ADL: 38). Although being a product of animal origin, a remarkable fibre content was found due to the presence of chitin and other insoluble protein. Fatty acid (FA) composition of EE is charact. by a high percentage of polyunsaturated FAs (11% C18:3) which partly reflects the FA composition of leaves of Morus sp. as the only nutrient source of silkworm. Contents of essential amino acids exceed those of soybean meal by far (as g/16g N: Lys: 6,7, M+C: 4,1, Thr: 4,5, Trp: 1,75). In situ rumen protein degradation is low as described by the parameters: soluble fraction (a): 12,0%, potential degradability (b): 72,6%, rate constant (c): 1,1%/h, leading to effective degradabilities for passage rates 2, 5 and 8%/h of 38,1%, 25,3% and 20,9%. The UDP has a relative low intestinal protein digestibility of 53% however, estimated by in vitro pepsin-pancreatin solubility. SWP as protein supplement was tested in C/N balance trials with each 4 male Merino Landrace x German Blackface lambs (mean BW 40kg) fed ad libitum a diet of 25% hay and 75% concentrate. A basal concentrate consisting of only barley and mineral premix served as negative control, whereas an iso-N supplem. with potato protein was used as positive control . Compared with the negative control, the SWP ration showed a similar increase of N and energy retention as for the positive control: The results show, that SWP, due to its high UDP content with a favourable amino acid pattern, is a very valuable protein supplement for ruminant anim. Limitations in its use as ruminant feed result from the high oil content. Therefore extraction of SWP is desirable when SWP fed greater