| Abstract: |
This study included two experiments. In the first experiment, nine digestibility trials were carried out using 27mature Baldi rams to evaluate the effect of feeding different levels of concentrate feed mixture (CFM) with Berseem (Br) (Trifolium elexandrinum) and ad libitum rice straw (Rs) with or without tafla clay {1g /kg live body weight (LBW)} on digestibility, nutritive values and some rumen liquor parameters of the following experimental rations:(T1): 100% of nutritional requirements (SE and DCP) from CFM as Ghoneim requirements (1967) plus Rs ad libitum.(T2):50% of nutritional requirements from CFM plus 50% from Br. (2nd cut) plus Rs ad libitum.(T3):50% of nutritional requirements from CFM plus 50% from Br. (2nd cut) plus Rs ad libitum plus tafla clay (1g /kg LBW).(T4):20% of nutritional requirements from CFM plus 80% from Br.(2nd cut) plus Rs ad libitum. (T5): 20% of nutritional requirements from CFM plus 80% from Br. (2nd cut) plus Rs ad libitum plus tafla clay (1g /kg LBW). (T6): 50% of nutritional requirements from CFM plus 50% from Br. (3rd cut) plus Rs ad libitum.(T7): 50% of nutritional requirements from CFM plus 50% from Br. (3rd cut) plus Rs ad libitum plus tafla clay (1g /kg LBW). (T8): 20% of nutritional requirements from CFM plus 80% from Br. (3rd cut) plus Rs ad libitum. (T9): 20% of nutritional requirements from CFM plus 80% from Br. (3rd cut) plus Rs ad libitum plus tafla clay (1g /kg LBW). The results of daily dry matter intake showed no significant differences among all tested rations. The digestion coefficients of all nutrients of rations contained 50% and 20% CFM with tafla (T3,T5,T7 and T9) were not significantly differed than rations contained 50% and 20% CFM without tafla (T2, T4, T6 and T8). Tafla supplementation to rations did not enhance the nutritive values. The daily feed units intake were insignificantly (P>0.05) increased with control ration compared with other rations. The results of NH3-N concentration at 2 hr. after feeding significantly (P<0.05) differed among all the experimental rations. The ruminal pH values at 2 hr. after feeding significantly (P< 0.05) increased with groups (T8 and T9) compared with different experimental groups and the control one. The results of TVFA,s at 2 hr. after feeding showed insignificantly differences among the tested rations.The second experiment included two trials on lactating buffalos (7 in each trail) to investigate the effect of tafla clay addition and feeding different concentrate: roughage ratio according to the nutritional requirements as Shehata (1970) from CFM, berseem (2nd cut) and rice straw on digestibility, nutritive values, milk and fat yield, milk composition, feed conversion and the economical efficiency of the tested rations (Swing over method design).In the first trail, the experimental rations were (T1,T2 and T3) from 1st experiment. The results showed that daily dry matter intake (DMI) insignificantly increased with control group (T1) comparable to that of (T2) and (T3).The body weight change showed that the highest value was recorded with the control ration (T1) followed by T3 and the lowest value was observed with T2. The digestibility of OM, CP and CF insignificantly increased when lactating buffalos fed T3 compared to those which fed T1. The nutritive values as TDN and SE indicated that there were no significant differences among treatments. The differences of feed units intake were not significantly affected among the tested rations. The fat yield and fat corrected milk (FCM) of T3 was insignificantly higher than those of T2 and the control (T1). The 50% CFM with tafla ration (T3) significantly increased fat content of milk compared to the other rations. The average values of milk constituents’ yields, feed conversion and the economical efficiency were higher with T3 than the other groups.In the second trial, the experimental rations were (T1, T4 and T5) from 1st experiment. The results showed that daily dry matter intake (DMI) were significantly (P<0.05) decreased with T3 compared with other rations. The highest value of body weight change was recorded with the control ration (T1) followed by T3 and the lowest value was observed with T2. The digestibility of CP and CF insignificantly increased when lactating buffalos fed T3 compared to those which fed T1 or T2. The nutritive values were significantly (P<0.05) increased with control ration (T1) compared to those of T2 and T3. The feed units intake wase significantly (P<0.05) increased with control ration (T1) than the other rations (T2 and T3). The values of the calculated milk yield, fat yield and fat corrected milk (FCM) yield of T3 was insignificantly higher than the control and T2 values. Fat content was significantly (P<0.05) increased with T2 and T3 compared with control ration. But the milk protein content was significantly increased with control ration (T1) compared with (T2) and (T3). The average values of most milk constituents’ yields of produced milk were higher with T3 than the other groups. The feed conversion showed that T3 ration was significantly (p<0.05) more efficient than other groups (T1 and T2).The economical efficiency of the animals which fed T3 was higher than other groups.The results concluded that tafla clay can be using at 1g / kg live body weight in ruminant animals’ diets which based on concentrate and green forage together because of its good effects on production performance and economic efficiency without any adverse effects on animals.
|
|
|