Effect of some feed additives on fattening and carcass characteristics of Friesian calves
Abstract: Twenty-five male Friesian calves of about 9 months and 187.6 kg average body weight were randomly divided into five similar groups, 5 animals in each group, to study the effect of Bospro (Aspergillus fermentation extract) and Gustor XXI (mixture of malate and yeast) on production performance, digestion, rumen and blood parameters, body dimensions and carcass traits of calves. Treatments were consisted of basal ration without additives (control, T1) or the basal ration with added 30 g Bospro/head/day (T2), or with 45 g Bospro/h/d (T3), or with 3 g Gustor XXI/kg ration (T4) or with 4.5 g Gustor XXI/kg ration (T5). Basal ration was consisted of concentrate feed mixture, berseem hay and rice straw. Animals were fed according to (NRC, 1984) and Salama et al., (2001) method, while Salama et al., (2001) method increased 18% than (NRC, 1984) as TDN. The digestion coefficients of DM and NFE did not change due to additives. Each of OM and CF digestibility and TDN did not differ between T2, T3 and T5 groups being enhanced (P<0.05) relative to T1 and T4. T2 improved (P<0.05) CP digestibility and DCP as compared with all groups, whereas the T3 and T5 improved (P<0.05) relative to T4 and T1. T2 showed the highest (P<0.05) EE digestibility, followed by T3, T5, T4 and T1 with no significant differences among those treatments. SV was improved (P<0.05) with T2, T3, T5 as compared with T1. T2 recorded the highest (P>0.05) values of DMI, TDNI and SVI kg/h/d, while the lowest value was recorded for T1. T2 increased (P<0.05) DCPI kg/h/d relative to T1 and T4. DM, TDN and SV conversion was improved (P>0.05) for T2 group, while, T5 group (P>0.05) more efficient in DCP conversion. T2 and T5 groups recorded higher economical efficiency than T1, T3 and T4. T2, T3 and T5 groups decreased ((P<0.05) ruminal pH as compared with T1,while, T4 showed an intermediate value without different between treatments. Ruminal NH3-N was decreased (P>0.05) with T4 and T5, while, T3 increased (P<0.05) ruminal NH3-N as compared with T4 and T5 ,however, ruminal NH3-N was increased (P>0.05) with T2. TVFA's concentration was increased (P<0.05) for T2 as compared to all groups, while, T3 and T5 increased (P<0.05) TVFA's relative to T1 and T4. Plasma Total protein, Albumin and Urea-N increased (P<0.05) for T2, while, there were not any differences between treatment in plasma Globulin and Al/G ratio. T2 improved (P<0.05) total body weight gain and average daily gain, however, T3 and T5 increased (P>0.05) relative to T1 and T4 groups. Body dimensions increased (P>0.05) for T2 as compared with all groups. T2 improved (P>0.05) hot carcass weight, dressing percentage, while, boneless meat weight, boneless meat percentage, tenderness increased (P<0.05) with T2.
Publication year 2005
Pages pp. 174
Availability location مكتبة معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
Availability number 707
Organization Name
Country Egypt
Author(s) from ARC
Agris Categories Animal physiology - Nutrition
AGROVOC
TERMS		 Blood. Blood composition. Body weight. Calves. Carcass composition. Digestion. Malates. Performance testing. Rumen. Yeasts.
Proposed Agrovoc Aspergillus fermentation;body dimensions;
Publication Type Master Thesis
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