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The experimental results of feed conversion showed that the mixed group was better and the yeast group was inferior, while the control group was worse.
Table-3: Weight gain, feed intake, and feed conversion ratio (FCR) in broilers fed diets supplemented with different concentrations of naringenin at 21-42 days and 0-42 days.
The feed conversion value decreased (P<0.01) as the dietary methionine + cysteine: lysine ratio increased, according to the regression equation: FC = 2.585-1.094X ([R.sup.2] = 0.82).
The replacement of soybean oil with canola oil (contrast 2) in the diet increased (p < 0.05) feed intake, resulting therefore in a lower feed conversion per dozen and per mass of eggs produced.
Feed conversion ratio (FCR) was measured on the basis of total feed consumed by a broiler bird for gaining one kg weight.
Final weight, feed intake and weight gain during 1-21 days of age was lower (p<0.05) and feed conversion was worse for diets containing probiotic B when compared with other treatments.
Feed intake and feed conversion ratio were significantly affected by SCP levels during the interval and the whole experimental periods compared with control group.
These estimates include the costs of prophylactic drugs, alternative treatments (e.g., with amprolium) if the medications fail and losses due to mortality, morbidity and poor feed conversion of birds that survive outbreaks.
The sera then collected were stored at -20 0C till use.2.3- Humoral immune responseThe sera were analyzed by HI (Haemagglutination inhibition) test to detect antibodies against NDV andindirect ELISA (enzyme-linked immunosorbent assay) (Kirkegaard and Perry Laboratories - KPL) for the detectionof IBD antibodies.On the days of vaccines the bloodsamples were collected prior to administration of the vaccine.2.4- Feed conversion ratioThe effects of vaccine schedule on growth performance of broiler as determine by Mean body weight (MBW) and feedconsumption of chicken measure at termination of the study period.
Even though the full utilization of space for maximum fish production through intensive culture can improve the profitability of the fish farm, several studies have indicated an inverse relationship between the stocking density and growth rate of tilapia fingerlings, caused by voluntary appetite suppression, more expenditure of energy because of intense antagonistic behavioral interaction, competition for food and living space [8] and increased stress [22], Also, the relationship between feed conversion ratios and survival rates of the fish and stocking density is not found consistent [10, 23].