Effects of condensed tannin of Onobrychis viciaefolia hay on the rumen metabolismand in situ degradation of diets by sheep

Abstract

Abstract: Three, one and a half years old, High Mountain Fine-wool wethers with an average weight of 24 kg, were fitted with permanent rumen fistulas. They received a random sequence of three treatments in a 3×3 Latin square design with feeding cycles of 19 days (10 d preliminary period and 9 d sampling period) to study the effect of condensed tannin of Onobrychis viciaefolia hay on rumen metabolism. Condensed tannin (CT) contents in treatmentsⅠ, Ⅱ and Ⅲ were 0.00, 1.52, and 3.03 g/kg of DM, respectively. Three similar sheep were used to measure in situ degradation of DM and CP of three diets. 1) The average rumen pH values of the three treatments were 6.24±0.32, 6.13±0.28, and 6.13±0.37 respectively, and were not significantly different. 2) The ruminal concentration of total VFA tended to increase with the tannin content (P=0.099). Molar proportions of acetic acid were lower (P＜0.05, P=0.074) while those of propionic acid were higher (P=0.088) in treatment Ⅲ than treatmentsⅠandⅡ, and the A/P was lower (P=0.096). 3) The ruminal total N, protein-N, bacteria-N, NH₃-N and urea-N concentration were not significantly (P＞0.05) different. Cellulolytic microbial activity was restrained to a certain extent by 3.03 g CT /kg of DM from O. viciaefolia hay in the diet but amylolytic microbial activity in the rumen was increased.

CLC Number:

S826.5

ZHANG Xiao-qing, HAO Zheng-li, LI Fa-di, ZHENG Chen, JIN Yan-mei, WU Qiu-jue, LI Yong. Effects of condensed tannin of Onobrychis viciaefolia hay on the rumen metabolismand in situ degradation of diets by sheep[J]. Acta Prataculturae Sinica, 2010, 19(1): 166-172.

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