Abstract

Ozet Bu arastirmada, kuzu besisi yemine katilan antibiyotigin (Zinc Bacitracin) kuzularda canii agirlik artisina, yem tuketimine, yemden yararlanma duzeyine, karkas ozelliklerine ve kuzu maliyetine olan etkisi incelenerek, entansif kuzu besisinde kullanilma olanaklarinin saptanmasi amaclanmistir. Arastirmada materyal olarak, yaklasik 3 aylik donemde sutten kesilmis ikiz erkek Kivircik irki kuzu­lardan sekizerli 3 grup halinde toplam 24 bas kuzu kullanilmistir. Deneme suresince kontrol ve deneme 1 ve deneme 2 gruplarindaki kuzulara buyutme yemi ve iyi kaliteli kuru ot ad libitum verilmistir. Arastirmada antibiyotik olarak kullanilan zinc bacitracin (ALBAC. % 15'lik); Deneme 1 grubundaki kuzulara 200 mg/kg (30 ppm) yem; Deneme 2 grubundaki kuzulara ise 400 mg/kg (60 ppm) yem miktarda ku­zu buyutme yemlerine katilarak hazirlanmistir. Kontrol grubundaki kuzularin yemine ise antibiyotik katilmamistir. Kuzularin 56 gun suren arastirma sonunda elde edilen besi sonu canli agirliklari Kontrol, Deneme I ve Deneme 2 gruplarinda sirasiyla 30.69, 30.91 ve 30.22 kg olarak belirlenmistir (P>0.05). 0-56 gunluk besi suresince gunluk ortalama canli agirlik kazanci ise sirasiyla 230.4. 196.8 ve 198.5 gram olarak bulunmustur (P>0.05). Bu gruplardaki hayvanlarin 1 kg canli agirlik artisi icin tukettigi konsantre ve kaba yem miktarlari karsilastirildiginda, rasyonuna antibiyotik katilmayan kontrol grubu kuzularda yemden yararlanmanin deneme gruplarina gore daha iyi oldugu saptanmistir. Kuzularin soguk karkas agirliklari Kontrol, Deneme I ve Dene­me 2 gruplarinda sirasiyla 14.88, 15.48 ve 15.09 kg; soguk karkas randimani %46.31, %45.37 ve %44.37 ola­rak belirlenmistir. Sonuc olarak, entansif kuzu besisinde konsantre yemlere zinc bacitracin degisik oranlarda katilmasi­nin kuzularin besi performansini, karkas ozelliklerini ve besi karliligini olumlu yonde etkilemedigi soylenebi­lir. Anahtar Kelimeler: Kivircik, kuzu, zinc bacitracin, besi performansi, karkas Ozellikleri, kuzu maliyeti EFFECTS OF ZINC BACITRACIN ON FATTENING PERFORMANCE, SOME CARCASS CHARACTERISTICS AND LAMB COST OF KIVIRCIK LAMBS Summary In this study, the effects of zinc bacitracin supplementation into iamb fattening diets on live weight gain, feed consumption, feed conversion, carcass traits and lamb cost were investigated and it was aimed to determine the possibilities of using zinc bacitracin in the intensive lamb fattening programmes. A total of 24 twin-male Kivircik lambs which were weaned at 3 months of age were used as the ma­terial of the research. Lambs were divided into 3 groups each of which comprised 8 heads. Lambs in control, experimental 1 and experimental 2 groups were fed with forages and concentrates ad libitum, during fattening period. Zinc bacitracin used as antibiotic was supplemented 200 mg/kg (30 ppm) concentrate into experimen­tal 1 group's rations and 400 mg/kg (60 ppm) concentrate into experimental 2 group's rations. No antibiotic was supplemented into control group's diet. At the end of the study which was continued 56 days, the lambs live weight of control, experimental 1 and experimental 2 groups were determined to be 30.69 kg, 30.91 kg and 30.22 kg respectively (P>0.05). The means of daily live weight gain during fattening period in the groups were found as 230.4 g, 136.8 g and 198.5 g respectively (P>0.05). When the amounts of the concentrates and forages consumed per kg of live weight gain were inves­tigated, feed conversion of control group which had no antibiotic in their diet, was found to be better than the experimental groups. Cold carcass weight of control, experimental 1 and experimental 2 groups were found to be 14.88 kg, 15.48 kg and 15.09 kg respectively and dressing percentage were calculated to be 46.31%, 45.37 % and 44.37% respectively. The research concluded that supplementation of zinc bacitracin into concentrates for intensive lamb fattening programme would not positively affect fattening performance, carcass traits and fattening profitabi­lity positively. Key Words: Kivircik, lamb, zinc bacitracine, fattening performance, carcass characteristics, lamb cost

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