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Abstract
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Development of replacement heifers is one of the most important issues in dairy cattle herds. Weaning weight of calves is notable as one of the most sensitive indicators of the animals. The useful effects of probiotics in livestock ration like increasing the food efficiency caused increasing use of these materials in animal husbandry. Present study was order to compare the three methods of probiotics (Bioplus 2 B®) feeding and their growth effects on suckling dairy calves. Twenty-eight female Holstein calves were selected completely random in four groups (n=7, three treatment groups and one control group). All groups used the same ration throughout the experiment, were weaned at 75 days of age and used 2 g per head/day Bioplus 2 B®. The first group received Bioplus in their milk from 65 to 75 days and from 75 to 80 days mixed with 39 ° C water, the second group used from 65 to 85 days mixed with their daily starter, the third group fed in their milk from 65 to 75 days and mixed with their daily starter from weaning day. The control group received no Bioplus. This procedure was continued until day 90. All animals and their daily food consumption weighed on three consecutive days leading up to 65, 75 and 90 day and withers height were measured in 90 day. Feed Consumption of 65 day of groups one, two, three and control were 1100, 970,970 and 810 gr/day and mean weight of them 67.4, 59, 63.7 and 63.1 kg, respectively. The mentioned parameters of four groups were 1400, 1000, 850 and 1500 gr/day and 73.1, 63.4, 69.9 and 67.4 kg in 75 day, and 2000, 2900, 2300 and 2800 gr/day and 88, 78.6, 84 and 78.8 kg in 90 day, respectively. Average withers height of ninety days old of four groups were 95.7, 88.1, 91.3 and 84.9 cm. There were no significant results in weight gaining of four groups (p>0.05) however, the 3 treatment groups were significantly taller than the control group (p<0.05). The seemingly probiotic in addition to improvements of group one in weight gain (although n
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