Abstract
This experiment was conducted to evaluate the effects zeranol implant on meat quality of Awassi lambs and cross-bred Khalkhali and Abadeh goat kids. Ten ram lambs (33.7 ± 0.5 kg and 4-month-old) and ten male goat kids (18.8 ± 0.7 kg and 4-month-old) were randomly assigned into two treatments (5 each treatment); C (control, 0 mg zeranol) and Z (24 mg zeranol implant) for each species. After 43 days experimental period. The animals were slaughtered, left for 24 hr post-mortem period and Biceps femoris muscle of each species were separated for measuring the proximal composition, TBARS values, cooking loss, drip loss and free fatty acids concentrations. Zeranol implants had significant (P<0.05) effect on dry matter, but did not have any effect on all other meat characteristics. However, dry mater was significantly higher for zeranol-implanted group as compared with control one. Moreover, significant effect of animal species was found for cooking loss, being highest in goat meat than ram lamb meat. Similarly, significant effect of animal species was noticed on TBARS values being highest in ram lamb meat. An obvious increase (P<0.005) in drip loss and TBARS values were observed for meat of both zeranol-implanted and non-implanted groups with storage period. It can be concluded that zeranol implant did not have any effect on meat quality for both ram lambs and male goat kids’ meat.
Highlights
Sheep and goat production are rapidly developing among farmers in the broader Kurdish region in both commercial and smallscale farms [25]
There is a range of growth promoters available on the market; these vary from enzyme supplementation in feed, to the prophylactic use of antibiotics, probiotics, herbal metabolic stimulants, and the use anabolic steroids
Anabolic steroids have been reported that the utilization of anabolic steroid implants offers the greatest rate of profitability identified with expanding efficiency outside of giving the most satisfactory feeding to beef cattle [26]
Summary
Sheep and goat production are rapidly developing among farmers in the broader Kurdish region in both commercial and smallscale farms [25]. An increasing polyunsaturated fatty acid is very important to human health [18] which have a great biological and cellular functions including producing of prostaglandins, improving of immune function, and organization of response to potential pain and inflammation [10] These are considered more susceptible to oxidative reactions which adversely influence the sensorial attributes of meat through the formation of lipid oxidation by-products such as hydroperoxides, malondialdehyde, 4-hydroxynonenal and volatile compounds [19]. The main purpose of this study was to address the use of zeranol implantations under common small-scale farming, pastured, practices, and the subsequent lamb and goat meat quality. The TBARS in meat samples was determined and expressed as mg of malondialdehyde equivalents / kg meat using an appropriate malondialdehyde standard curve
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