International Graduate Conference on Science, Humanities and Engineering 2011 (IGCSHE2011)

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Research Title: 
Partial Replacement of Barley Grains and Soybean Meal by Fleabane (Conyza bonariensis) in Diets of Fattening Awassi Lambs
Jamal Abu Omar
Wed, 2011-05-04
Partial Replacement of Barley Grains and Soybean Meal by Fleabane (Conyza bonariensis) in Diets of Fattening Awassi Lambs98.44 KB
Research Abstract: 

Effects of partial substitution of barley grain and soybean meal with fleabane (FB) Conyza bonariensis on growthperformances and body composition on twenty four male local Awassi lambs were studied. All lambs were malewith an average body weight of 20.3 kg (S.D. = 2.0 kg) at the beginning of the experiment. Animals were randomlydivided into four groups of six lambs each. Lambs in each group received individually their cereal-soybean basedtotal mixed rations (TMR) with levels of FB: 0, 50, 100 and 150g/kg DM diet which replaced similar values ofbarley and soybean meal. All rations were isonitrogenous and isocaloric. The fattening experiment lasted 9 weeks,after which all lambs were slaughtered. The composition of nutrients in the Conyza bonariensis were 89.6, 20.0,62.0, 38.0 and 10% for organic matter, crude protein, neutral detergent fiber (NDF), acid detergent fiber (ADF) andlignin, respectively. At the end of the experiment, lambs fed 100 and 150g FB/kg DM diets gained more weight (P <0.05) than those fed the control and 50g FB/kg DM diets. Dry matter (DM) intake was not affected by the inclusionof FB. Diet content of FB had significant effect (P<0.0) on empty body and carcass weights, dressing percentage,liver and gut among all animals. However, FB had no effects on lambs’ external (skin, head and feet) and thoracicorgans (lungs and heart). Muscle, bone and adipose tissue mean weights were increased by the increase of FB.Animals given FB at the levels of 100 and 150 g FB/kg DM diets had relatively more muscle, bone and fat (P <0.05) than those fed 0 and 50 g FB/kg DM diets. Fleabane had no effect on omental and mesenteric fat. However,FB at the highest two levels resulted in more (P < 0.05) total body and carcass fat compared to that in animal fed thecontrol and the low FB levels.