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Improvements of animal productivity, feed utilization and animal health are the aims of rumen microbial studies. These aims could be achieved by producing desirable fermentation products as probiotics or direct fed microbial (DFM). Probiotics can play an important role to improve dairy animal’s health and its productive performance through desirable manipulation of rumen fermentation.
The aim of this study was to evaluate effect of probiotic supplementation to dairy cows rations on Energy and Protein Utilization Efficiency.
The present study was carried out at labs of Animal Nutrition, Animal Production Department, Faculty of Agriculture, Ain Shams University, And Sanad dairy farm near Damietta, during the period from 1 January to 30 March 2017. Fifty lactating Holstein-Friesian cows (multiparous and primiparous) were distributed between the two groups 25 cows each, and the season of lactation was concerned. This experiment was started one week after calving time and extended for three months after parturition. The animals were fed total mixed ration (TMR, Table 2) without or with probiotic supplementation at dose106 CFU/kg DM for control and treated group, respectively. Each group was placed in a shaded pen equipped with free stalls. The diets were formulated to cover NRC requirement for dairy cattle (NRC, 2001). The diets were offered daily adlib. And the animals had free excess to clean fresh water.
The results are summarized as follows:-
1. Feed intake and nutrient digestibility:
The result showed slightly increase in totaldigestible nutrients (TDN) and Digestible crude protein (DCP) intake for the group fed ration supplemented with probiotics compared to the control group.
The results showed the probiotic supplementation, significantly, increased the DM and NDF digestibility comparing control group. While, OMD, CPD, CFD, EED, NFED were numerically increased than control group but the differences were not significant.
2. Effect on some Blood parameters:
The data showed that the supplementation of probiotics to lactating cows diets didn’t has a significant effect on total protein, albumine and globuline concentration comparing control group WhileAlkaline phosphatase (ALP) was significantly decreased by probiotics supplementation than control group.
3. Milk production and composition:
The results indicated that probiotic supplementation to lactating animals diet has a positive effect on milk production. Milk yield, 4% fat corrected milk, energy corrected milk were, slightly, increased andthe differences were not significant. Moreover, milk total solid and fat content were significantly increased. A slightly positive change in milk protein, milk lactose, milk ash, milk solids non fat was shown but the differences were not significant.
4. Energy balance and nitrogen efficiency of utilization
The results declared that the maintenance energy requirements for control group were higher than the probiotic group and this due to that the control group has a higher initial body weight than the probiotic treatment.
5. Milk fatty acids and amino acids profiles:
The results indicated that there are no significant differences among fatty acids. Some ofUnsaturated fatty acids were slightly enhanced for treated group than control.
6. Body condition score and body weight
The data showed normal curve for both parameters and these may be due to the associated negative energy balance during the early lactation stage.
It could be concluded that, adding probiotics bacteria supplementation to experimental rations resulted increase DM and OM degradability and using dose of 106CFU/kg DM feed is sufficient to induce improvement in degradability and fermentation parameters.