Effects of Bio - Top supplementation ( as commercial probiotics ) on the
performance ,nutrient digestibilities and some rumen liquor parameters of fattening
Rahmany lambs were studied. Sixteen fattening Rahmany male lambs on an average
39 kg live body weight were used in this study .The lambs were divided into four equal
groups. Lambs were fed diets of bean straw and concentrate feed mix ( 30 : 70 on DM
basis) supplemented with Bio - Top at level 5 ,7.5 ,and 10 gm / head / day for groups
2 ,3 and 4 ,respectively 90 days.The group 1 ( control group) received the same basis
ration without the Bio - Top supplement. The results of the animal performance showed that supplementation of Bio -
Top improved growth rate and consequency average daily gain (
ADG ) of treatments groups compared with control group .Lambs feed 10 gm Bio -
Top recorded the highest ( 169 gm ) ADG ( P > 0.05 ) than other groups ,while the
lowest one recorded for control group ( 139 gm ). Daily feed intakes
expressed as DM was slightly higher for treated lambs.The results of feed efficiency
show that lambs fed Bio-top supplemented ration had the highest values of body gain
related to the unit of DMI,TDN and DCP.values The results of nutrients digestibility pointed thafsupplementation rations with
bio-top improved DM, OM,CP , EE and NFE digestibilities compared to control group (
unsupplemented group). Crude protein digestibility increased as level of Bio -top
increased (5,7.5, and 10 gm / head / day). The same trend has been recorded with
CF digestibility. The main results indicated that TDN , DCP and N - Balance contents were
increased linearly with increased of level of growth promoter supplemented. Ammonia - N concentration of rumen liquor tended to increased gradually
as a result of supplementing 5 , 7.5 and 10 gm of Bio - top / head / day.The highest
value was recorded for group 4 followed by group 3 and 2 , while the lowest value for
control group. The highest income over feed cost were obtained from lambs of group
4,while the lowest was with lambs of group 1 (control group ). In view of the obtained results, it Could be concluded that supplementation
with Bio - top ( as a commercial probiotic ) to fattening lambs as a feed additive
during this stage improved the animal performance, digestibility, feeding values and
reduce the cost of the product ( meat production) by increasing the feed efficiency of
roughages.Furtheremore, supplementation with Bio - top at rate of 10 gm / head / day
showed to be the best rate for fattening lambs.