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Pakistan Journal of Nutrition
  Year: 2005 | Volume: 4 | Issue: 6 | Page No.: 384-388
DOI: 10.3923/pjn.2005.384.388
 
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Effect of Two Beta-Adrenergic Agonists on Performance and Carcass Composition of an Iranian Native Breed of Sheep
M. Nourozi , M. Abazari , M. Mohammadi , M. Raisianzadeh and A. ZareShahne

Abstract:
The effects of terbutaline (T), metaproterenol (M) and low energy diet (LE) on growth performance and carcass composition were evaluated in 72 Moghani culled ewes. T and M each one at the doses of 0, 5, 10 and 20 mg/ kg DM (C, T5, T10, T20, M5, M10 and M20 respectively) were added to the diet (ME: 2.9 MJ/Kg DM) of seven groups of 63 culled ewes and the other group was fed on LE (ME: 2.5 MJ/Kg DM) for the final 8 wk of the fattening period. T10 and M20 increased (p<0.05) final and cold carcass weights of ewes. LE ewes had lower daily dry matter intake than controls (1126 vs. 1500 g/day). Except for T5 and LE, all beta-adrenergic treated groups showed improved (p<0.05) of food conversion efficiency of 17.6% to 26.9% compared with controls. Increased (p<0.05) carcass efficiency was obtained by M5, M10 and M20 relative to controls (49.94%, 50.07% and 50.64% vs. 46.31%). Total carcass protein was higher (p<0.05) for ewes receiving the M20. Ewes treated with T20, M5, M10, M20 and LE had lower (p<0.05) fat-tail weight than controls (3.64, 3.55, 3.54, 3.52 and 3.99 kg vs. 4.52 kg). Blood urea concentration was reduced by LE treatment 12.5% and 23.8% on days 60 and 90 respectively. Results indicated that metaproterenol causes a repartitioning of nutrients resulting in improved feed conversion, increased carcass meat and lowered weight of-fat tail. Metaproterenol was more effective on feedlot parameters and carcass characteristics than terbutaline and low energy diet.
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How to cite this article:

M. Nourozi , M. Abazari , M. Mohammadi , M. Raisianzadeh and A. ZareShahne , 2005. Effect of Two Beta-Adrenergic Agonists on Performance and Carcass Composition of an Iranian Native Breed of Sheep. Pakistan Journal of Nutrition, 4: 384-388.

DOI: 10.3923/pjn.2005.384.388

URL: https://scialert.net/abstract/?doi=pjn.2005.384.388

 
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