| The leaves of Broussonetia papyrifera are rich in protein, amino acids, vitamins and trace elements. They
have great development potential as unconventional protein resources. To promote the further utilization of B. papyrifera as
feed, this experiment was carried out to evaluate the effects of adding pineapple residue on fermentation quality and protein
fractions of silages of B. papyrifera leaves using the Cornell Net Carbohydrate and Protein System (CNCPS). The experiment
wed single factor method designed with different addition rates (0, 5%, 10%, 15% and 20% fresh weight of pineapple
residue) and the silages were kept for 60 d at room temperature. The results showed that B. papyrifera leaves contained
higher buffering capacity and a few water soluble carbohydrates, the silage without pineapple residue had poor quality with
a high pH beyond 5.0. As the addition rate of pineapple residue was increased, the silage pH was significantly reduced and
the lactic acid content significantly increased . Compared with the control, the silage added with 20% pineapple residue
had the best fermentation quality. After ensiling, about 30% true protein in the leaves was converted to fraction A. The
contents of fraction A and fraction C were higher than those in fresh leaves, while the fraction B3 content was lower than
that before ensiling. Because pineapple residue contains higher non-protein nitrogen than B. papyrifera leaves, adding
pineapple residue increased fraction A content in the adding ensiled forage. Adding pineapple residue can improve silage
fermentation quality of B. papyrifera leaves. But the adding level must be appropriate, otherwise it can reduce the silage
nutritional value. |
