TY  - JOUR
T1  - Effects of Dietary Protein on Ruminal Fermentation, Nitrogen Utilization and Crude Protein Maintenance in Growing Thai-indigenous Beef Cattle Fed Rice Straw as Roughage
AU - Chen, Shengchang AU - Paengkoum, Pramote AU - Xia, Xianlin AU - Na-Lumpang, Pongchan 
JO  - Journal of Animal and Veterinary Advances
VL  - 9
IS  - 18
SP  - 2396
EP  - 2400
PY  - 2010
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2010.2396.2400
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2010.2396.2400
KW  - Thai-indigenous beef cattle
KW  -crude protein
KW  -maintenance
KW  -nitrogen retention
KW  -digestibility
KW  -ruminal ammonia
AB  - Six male growing Thai-indigenous beef cattle with Body Weight (BW) of 154&plusmn;13.18 kg were randomly assigned in replicated 3x3 Latin square design and fed with differences levels Crude Protein (CP) Total Mixed Ratio (TMR) diets. Crude Protein (CP) levels in diets were 4, 7% and 10% base on Dry Matter (DM), respectively. Dry Matter Intake (DMI) increased iinearly (p&lt;0.01) with increasing crude protein concentration. There was not significantly different (p&gt;0.05) digestibility of DM, Organic Matter (OM), Acid Detergent Fiber (ADF) and Neutral Detergent Fiber (NDF). Ruminal ammonia nitrogen (NH<SUB>3</SUB>-N) concentration increased (p&lt;0.01) with increasing CP level. Rumen pH, total VFA, acetate, propionate and butyrate were not affected by CP levels (p&gt;0.05). Nitrogen (N) intake, urinary N excretion, N digestibility, N retention (g day<SUP>-1</SUP>) and N retention (Percentage of N intake) increased linearly with increasing dietary CP levels (p&lt;0.05) and was affected significantly (p&lt;0.01) by diet of CP levels, respectively. However, the fecal N excretion was not affected (p&gt;0.05) by dietary CP levels. The CP for maintenance requirement in growing Thai-indigenous beef cattle was 3.54 g kg<SUP>-1</SUP> BW<SUP>0.75 </SUP>which was estimated by using linear regression of N retention and N intake.
ER  -