TY  - JOUR
T1  - Annual and Seasonal Changes in Ruminal Degradability of Diets by Grazing Steers in Native Range
AU - Murillo Ortiz, M. AU - Reyes Estrada, O. AU - Herrera Torres, E. AU - Gutierrez Ornelas, E. AU - Gonzalez Garcia, H. 
JO  - Agricultural Journal
VL  - 5
IS  - 4
SP  - 259
EP  - 263
PY  - 2010
DA  - 2001/08/19
SN  - 1816-9155
DO  - aj.2010.259.263
UR  - https://makhillpublications.co/view-article.php?doi=aj.2010.259.263
KW  - Steers
KW  -grazing
KW  -nutritive quality
KW  -ruminal degradability
KW  -detergent fiber
KW  -seasonal change
AB  - The objective of this study was to evaluate the annual and seasonal changes on <I>in situ</I> degradability of dry matter, crude protein and neutral detergent fiber in the diet of grazing steers. For the statistical analysis a fixed effects model was used. Significant effects of years were observed in soluble fractions a, degradable b, degradation rate c of the Dry Matter (DM) and Crude Protein (CP) (p&lt;0.05). Also was observed effects between years in the Potential Degradability of Dry Matter (PDDM), Potential Degradability of the Crude Protein (PDCP) and Potential Degradability of the Neutral Detergent Fiber (PDNDF) as well as in the Effective Degradability of Dry Matter (EDDM), Effective Degradability of Crude Protein (EDCP) and Effective Degradability of Neutral Detergent Fiber (EDNDF) (p&lt;0.05). The values of a, b, c of DM and CP as well as the PDDM, PDCP, EDDM and EDCP of the diet in summer and in fall were higher than those observed in winter and spring (p&lt;0.05). Soluble fraction A and degradable B as well as values of c of the Neutral Detergent neutral (NDF) in summer and fall were equal but different from those observed in winter and spring (p&lt;0.05) while the PDNDF and EDNDF were different between seasons (p&lt;0.05). We conclude that annual and seasonal weather changes affected <I>in situ</I> degradability of DM, NDF and CP in the diet selected by grazing steers.
ER  -