TY - JOUR ID - 62060 TI - Effects of of monensin supplementationalone or in combination with Methafix on ruminal fermentation and fatty acids composition of Longissimus Dorsi muscle in Farahani finishing lambs JO - Iranian Journal of animal Science JA - IJAS LA - en SN - 2008-4773 AU - Alipour, Mohammad Taghi AU - Azarfar, Arash AU - Kiani, Ali AU - Khaldari, Majid AD - M. Sc. Student, Department of Animal Science, Lorestan University, Iran AD - Associate Professor, Department of Animal Science, Lorestan University, Iran AD - Assistant Professor, Department of Animal Science, Lorestan University, Iran Y1 - 2017 PY - 2017 VL - 48 IS - 1 SP - 89 EP - 99 KW - fatty acids composition KW - volatile fatty acids KW - di-carboxylic acids KW - ionophers fattening lamb DO - 10.22059/ijas.2017.200821.653425 N2 - This study was conducted to evaluate the effects of dietary inclusion of monensin alone or in combination with Methafix (a commercial product containing malate and fumarate) on rumen fermentation parameters and fatty acids composition of longissimus dorsi muscle (LD) of Farhani finishing lambs. Twenty four male Farhani lambs (4-6 months old, average body weight 35.9 ± 7.4 kg) were used. The lambs were randomly divided into four groups and individually fed with one of the four dietary treatments; control diet (Control), Control plus 24 mg of monensin/kg of DM (Monensin), control plus 4 g of Methafix/kg DM (Metafix) and Control plus 24 mg of monensin and 4 g of Methafix/kg DM (MonMet). Results showed that Monensin and/or MonMet decreased acetate (P<0.05) but increased propionate in comparision with control (P<0.05). Monensin, Metafizx and MonMetall had higher concentrations of lauric, myristic and margaric acids than control (P<0.05). However, palmitic, stearic and behenic acids content of LD were decreased by dietary supplementation with Monensin and metafix (P<0.05). Dietary treatments had no effect on LM concentrations of all mono-unsaturated fatty acids (except for nervonic acid), eicosatetraenoic, arachidonic, eicosaenoic and α-linoleic acids (P>0.05). However, dietary supplementation with M and ME increased LM concentrations of docosahexaenoic, docosatetraenoic, eicosapentaenoic and omega-3 fatty acids in comparison with control (P<0.05). In conclusion, both monensin and metafix seems to be promising agents for manipulation of rumen fermentation and fatty acid composition of meat in fattening Farahani lambs, however for revealing their functional mechanisms further research is needed. UR - https://ijas.ut.ac.ir/article_62060.html L1 - https://ijas.ut.ac.ir/article_62060_d2992db3056833b741c409287a04b01b.pdf ER -