Comparison Of Microbial Population In Ruminal Fluid Of Sistani And Holstein Cattle Fed Different Roughages
2007
Mansouri, H., Scientific Member of Animal Science Research | Nik- Khah, N., Institute Scientific | Rezaeian, M., Institute Scientific | Mirhadi, S.A., Scientific Member of Animal Science Research .
In order to compare rumen microbial population between sistani ( Bos indicus Bos indicus ) and Holstein ( Bos taurus Bos taurus ) breeds, three ruminaly fistulated Sistani steers in Karaj (SK), three Sistani steers in Zabol (SZ) and three Holstein steers in Karaj (HK) were used in a completely randomized design with factorial arrangement. These three groups of steer, in three different periods, fed three type of roughage diets including either alfalfa hay (ALF) , Phragmites australis (PA) or wheat straw (WS). The feed offered twice a day (8:00 and 16:00) at about maintenance level of requirements. The total population of bacteria per ml of rumen liquor were not significantly different among the groups fed different diets. Feeding of PA did not affect the protozoa concentration in the rumen liquor of Holstein (2.28*104) and Sistani (3.00*104), but when the animals fed ALF or WS the total protozoa number (per ml of rumen liquor) of SZ were significantly (p 0.05) higher than SK and HK groups ( 5.19*104 vs 3.71*104 and 2.96*104 respectively ). Also when animal received WS, total protozoa number of SZ were significantly (p 0.05) higher than SK and HK groups (3.03*104 vs 2.17*104 and 2.00*104 respectively). Holotrich protozoa number in three diets were ignificantly (p 0.05) higher in SZ than the other groups. No significantly differences were observed among the groups for the density of ruminal anaerobic fungal zoospore. It can be concluded that, the Holstein steers could have better potential to digestion of ALF, whereas the Sistani steers may ferment and digest PA and WS diets more efficiently.
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