جستجوی مقالات مرتبط با کلیدواژه « feed additives » در نشریات گروه « محیط زیست »

In this study, the effect of different feed additives and supplements on the growth performance of broiler chickens under heat stress was investigated. This study was performed in a completely randomized design using 380 one-day-old broiler chickens (male and female mixture) of Ross 384 strain. They were divided based on the same average weight. Experimental treatments are: 1- control treatment + standard temperature conditions, 2- control treatment + heat stress conditions, 3- control treatment + heat stress conditions + vitamin E + Organic Se, 4- control treatment + heat stress conditions Q10 + Vit C , 5- control treatment + heat stress conditions + ubiotics (probiotics + prebiotics + phytobiotics), 6- control treatment + heat stress conditions + 10% increase in diet methionine, 7- control treatment + heat stress conditions + increase of 20% to Diet methionine and 8- control treatment + heat stress conditions + traditional method (consumption of ice and non-alcoholic beer in drinking water). The results of feed consumption showed that there was a significant difference in the final and total periods between the experimental treatments (p <0.05). The results of body weight gain showed that there was a significant difference in all measurement periods between experimental treatments (p <0.05). The results of feed conversion ratio showed that there was a significant difference between the experimental treatments in the grower, finisher and total periods (p <0.05(. The results of carcass traits showed that there was a significant difference in live weight, percentage of breast, wing + back of neck and gills between experimental treatments (p <0.05). The highest live weight was observed in treatment 5 containing heat stress conditions + ubiotic, the highest and lowest percentage of breasts was observed in treatment 4 containing control + heat stress conditions Q10 + Vit C. The overall results of the present study showed that coenzyme Q10 and vitamin C increased feed intake and weight gain and ubiotic supplementation improved feed conversion ratio. As a result, it is advisable to add these beneficial additives, especially supplements containing vitamin C and coenzyme Q10, along with ubiotic supplements in broiler breeding.

The effects of different feed additives as antibiotic replacement on the growth performance, immune response, tibia characteristics and meat quality of broilers were investigated. In this experiment, 540 one-day-old male broiler chickens of Ross 308 strain were randomly distributed into 6 treatments with 6 replicates per each. The experimental treatments were 1) a control group (corn-soybean meal diet), 2) control group + 0.25 g/kg antibiotic as growth promoter (Lincomycin), 3) control group + 1 g/kg herbal extract (contains garlic, thyme, turmeric, lemon balm), 4) control group + 3 g/kg medium chain fatty acids (contains a mixture of caproic, caprylic, capric, and lauric acids), 5) control group + a mix of 1.5 g/kg prebiotic (MHF-Y) and 0.2 g probiotic (Lactofeed) and 6) 1 ml/L essential oils in drinking water (contains ferula gummosa, eucalyptus, clove, peppermint, thyme, fennel, ajwain and satureja). Feed conversion ratio and body weight gain were improved in broilers which received feed additives compared to control group throughout the experiment. Hetrophil and lymphocyte and antibody titers, and tibia characteristics were not affected by the experimental treatments. However, the highest relative weight of spleen and total ash of tibia observed in broilers which received medium chain fatty acids. experimental treatments had no effect on the meat quality. It can be concluded that feed additives may improved growth performance and some of the immune and tibia traits in broiler chickens