Effect of some feed additives on body dimensions, blood parameters and carcass characteristics of Friesian fattening calves

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Abstract: Twenty-five Friesian calves of about 9 months and 187.6 kg average body wieght were randomly divided into five similar groups of 5 animals to study the effect of Bospro (Aspergillus fermentation extract) and Gustor XXI (mixture of malate and yeast) on body dimensions. blood parameters and carcass characteristics. The duration of the field experiment was 240 days. Treatments were desined as control ration which consisted of concentrate feed mixture. berseem hay and rice straw. without additives (T1). or the same ration with added 30 g (T2) or 45 g (T3) of Bospro/h/d or with 3 g (T4) or 4.5 g of Gustor XXI/kg ration (T5). Animals were fed according to NRC. 1984 and Salama et at. method (2001). while Salama et al. method (2001) increased 18% than NRC 1984 as TDN. Body dimensions as heart girth, body length. height at withers and height at withers and height at hooks did not significantly affected by the different kinds and levels of additives and its values have no clear trend among treatments. Plasma total protein and Urea-N concentratiosn wre significantly higher for all supplemented rations than control one.
Regarding albumin. only T2 was singificantly higher than that of control (T1). while glubulin content was not affectyed by supplements. T2 had the highest values in respect of all blood parameters. Supplemented groups were insignificantly higher than control group for carcass length and round length. There was 0 effect on dressing percentage owing to the inclusion of all additives. with the highest value for T2 and the lowest one for T4 Also.
percentages of boneless meat did not significanlty cahnged due to the additives.
Supplemented groups were better than control group and T2 was the best group in weights of fore and hind quarters and its boneless meat weights. Weights of organs tended to be slightly more by low level of Bospro. Also. the control group recorded the highest fat percentag and T2 recorded the smallest value and treated groups had higher lean percentage insignificantly (P>0.05) than control group. The Longissimus dorsi area of the carcasses incresed insignificantly (P>0.05) with all supplemented groups. The Gustor XXI groups have the highest values of fat depth over L. dorsi followed by Bospro groups and then control group. The tenderness ws significanlty higher (P<0.05) with 30 g Bospro-ration than control and the other tested rations did not differ with control. No effect of different additives on W.H.C. was found, however, control ration was achieved the highest value.
There were no significant (P>0.05) differences among treatmens concerning CP, EE and ash contents of meat of rib cut.
Keywords: bospro, gustor xxi, body dimensions, characterstics, friesian fattening calves, Carcass, blood parameters.

Publication year

2005

Pages

179-199

Availability location

معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى - الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

serial title

Egyptian Journal Nutrition and Feeds

ISSN