A novel bacterial strain isolated in Australia, Propionibacterium jensenii 702 (PJ702), was examined for its potential as a direct-fed microbial (DFM) to improve weight gain in calves.
Holstein bull calves, 24, were randomly allocated into a treatment or control group and held under simulated commercial calf rearing conditions. Both groups were treated identically, with the exception that the treatment calves were given between 1.1×108 and 1.2×109 cfu/(kg day) of PJ702.
recovery of PJ702 from the treatment calves from week 2 indicated successful
gastrointestinal transit of the bacterium, and blood haematology and
biochemistry indicated no adverse effects following PJ702
improvements in weight gains with the treatment group during both the
pre-weaning and the weaning period.
Eighteen weeks after cessation of
treatment, and removal to an extensive farming operation, treatment calves
remained heavier to the control calves, with a final weight difference between
the groups of 21.3 kg.
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