DOI QR코드

DOI QR Code

Effects of the Pattern of Energy Supply on the Efficiency of Nitrogen Utilization for Microbial Protein Synthesis in the Non-Lactating Cows Consuming Grass Silage

  • Kim, K.H. ;
  • Lee, S.S. ;
  • Jeon, B.T. ;
  • Kang, C.W.
  • Received : 1999.08.16
  • Accepted : 1999.12.06
  • Published : 2000.07.01

Abstract

Effects of the pattern of energy supply on the efficiency of nitrogen utilization for microbial protein synthesis (MPS) were examined in cows consuming grass silage (7.1 kg DM/d) and supplement of 1 kg sucrose per day given as an intraruminal infusion. Three non-lactating cows received three experimental treatments in a $3{\times}3$ Latin square design with each period lasting 14 days. The treatments were (1) the basal diets of silage alone given in one meal each day at 09:30 h (BASAL), supplemented with (2) 1.0 kg sucrose given a 4-h infusion starting at 09:30 h (SYNC), (3) 1.0 kg sucrose given a continuous infusion for 24 h (CONT). Compared with BASAL, sucrose infusions altered (p<0.05) the pattern of variation in ruminal pH and the concentration of ammonia at 4 h after feeding but none of the sucrose treatments resulted in any changes in the ruminal concentration of VFA. All sucrose treatments increased (p<0.05) MPS relative to BASAL by 14% and 33% for SYNC and CONT, respectively, and that for CONT was greater (p<0.05) than for SYNC. It is concluded that synchronization of energy and nitrogen over the shorter term has no further advantage of the efficiency for MPS relative to CONT.

Keywords

Energy Supply Pattern;Grass Silage;Microbial Protein Synthesis

Cited by

  1. Adaptive changes in microbial synthesis and nitrogen balance with progressing dietary feeding periods in sheep fed diets differing in their ruminal degradation synchronicity between nitrogen and organic matter vol.79, pp.3, 2008, https://doi.org/10.1111/j.1740-0929.2008.00533.x
  2. Effects of starch and protein sources on starch disappearance in the gastrointestinal tract of Hanwoo (Korean native) steers vol.81, pp.3, 2010, https://doi.org/10.1111/j.1740-0929.2010.00750.x
  3. Review: Effects of feeding sugars on productivity of lactating dairy cows vol.91, pp.1, 2011, https://doi.org/10.4141/CJAS10069
  4. Effects of partial replacement of dietary starch from barley or corn with lactose on ruminal function, short-chain fatty acid absorption, nitrogen utilization, and production performance of dairy cows vol.98, pp.4, 2015, https://doi.org/10.3168/jds.2014-8827