The performances of broilers are shown in Table 3. Diet did not affect feed intake, dry matter intakeand feed conversion ratio. Body weight gain of chicks on the OA diet in the starter phase was higher (P<0.05) than that of chicks in the PC and other diets. Gain : feed ratio was improved (P <0.05) in the starterphase only by OA and PB supplementation compared with the other diets. Performance showed a significantgrowth-promoting effect by OA and PB. The significant effect of OA on body weight gain is similar to thefindings of Dibner & Buttin (2002) that organic acids have effects that go beyond those of antibiotics, whichinclude reduction in digesta pH, increased pancreatic secretion and trophic consequences on thegastrointestinal mucosa. The dietary additions of organic acids and probiotic had no significant effects onperformance traits, indicating a lack of additive effect of both dietary supplements. Generally, there areinconsistencies in reports in the literature on the beneficial effects of probiotics and organic acids on broilergrowth performance. Angel et al. (2005) recorded that under favourable rearing conditions, without diseaseor stress, dietary supplementation with probiotics had no beneficial effects on broiler growth performance. Ina study by Timmerman et al. (2006), it was reported that the positive effects of probiotics on highperformancebroilers were lower than in low-performing birds. Houshmand et al. (2012), in agreement withผลลัพธ์ของนานเดซและ al. (2006), ไม่พบผลบวกของกรดอินทรีย์ (กรด) ในประสิทธิภาพของ ในการศึกษานี้ น้ำหนักถูกมากได้ผลกระทบจากกรดอินทรีย์ในระยะเริ่มต้น
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