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http://dx.doi.org/10.5187/JAST.2002.44.5.549

Effects of Passtein® Supplements on Protein Degradability, Ruminal Fermentation and Nutrient Digestibility  

Choi, Y.J. (School of Agricultural Biotechnology, Seoul National University)
Choi, N.J. (School of Agricultural Biotechnology, Seoul National University)
Park, S.H. (School of Agricultural Biotechnology, Seoul National University)
Song, J.Y. (School of Agricultural Biotechnology, Seoul National University)
Um, J.S. (EUNJIN International, Co., Ltd.)
Ko, J.Y. (Nonghyup Feed INC.)
Ha, J.K. (School of Agricultural Biotechnology, Seoul National University)
Publication Information
Journal of Animal Science and Technology / v.44, no.5, 2002 , pp. 549-560 More about this Journal
Abstract
This study, including two in vitro experiments and an in vivo experiment were conducted to evaluate effects of Passtein$^{(R)}$ on crude protein degradability, ruminal fermentation characteristics and nutrient digestibility. In in vitro experiment protein degradability was examined using borate-phosphate buffer and neutral detergent, and using protease from Stroptomyces griseus at 39$^{\circ}C$ for 0, 2, 4, 8, 12, and 48 h. In addition, an in vivo experiment was conducted in a switch back design and ruminal fermentation and nutrient digestibility were determined. Four ruminal-fistulated Holstein cows weighing 300kg in mean body weight randomly allotted to 2 treatments (control and Passtein$^{(R)}$ supplementation). Although there was no significant difference on protein fraction between treatments, it appears that Passtein$^{(R)}$ supplementation decreased buffer soluble protein fraction compared to control. Protein degradability was not affected by Passtein$^{(R)}$ from 0 h to 4 h, but decreased at 12 h and 48 h compared to control. Degradation of immediately degradable fraction was higher in Passtein$^{(R)}$ treatment, but degradation of fermentable fraction was lower in Passtein$^{(R)}$ treatment compared to control. The pH and $NH_3$-N concentration tended to increase in Passtein$^{(R)}$ treatment, but VFA production, microbial counts and enzyme activity tended to decrease in Passtein$^{(R)}$ treatment compared to control. In addition, nutrient digestibility in the total tract tended to increase in Passtein$^{(R)}$ treatment compared to control.
Keywords
By-pass; Passtein$^{(R)}$; Degradability; Nutrient digestibility; Ruminal fermentation characteristics;
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