Effect of Dietary Yeast (Saccharomyces cerevisiae) Supplementation on Performance, Carcass Characteristics and Some Metabolic Responses of Broilers

Abstract

Abstract:This study was conducted to evaluate the effect of feeding graded levels of yeast on broiler performance, carcass characteristics and some hematological indices. One day old Hubbard broiler chicks (n=160) were randomly allocated to five dietary treatments. Each treatment consisted of 4 replicates of 8 broilers each. The dietary treatments contained 0% yeast (Saccharomyces cerevisiae) as a negative control diet, 0% yeast + 30 ppm Oxytetracyline as a positive control, 1%, 2% and 3% yeast in the starter and finisher diets. During the experimental periods of 6 weeks, feed intake, body weight gain and feed conversion ratio values were calculated. At the end of the experimental period (6 weeks of age), some biochemical and hematological indices, carcass characteristics traits and internal organs weights were recorded. Growth performance parameters were significantly (P≤0.05) affected by experimental diets. Chicks fed either 0 or 3% yeast recorded the highest (P≤0.05) feed intake, however, the best (P≤0.05) body weight gain was obtained by birds fed 0 or 1% dietary yeast compared to the positive control diet. The highest (P≤0.05) feed conversion ratio was reported for birds fed the positive control diet and 3% dietary yeast compared to the negative control diet. The inclusion of different dietary treatments had no significant (P≥0.05) effects on dressing percentage, hot base and relative weights of heart, gizzard and abdominal fat. Nevertheless, birds fed 3% dietary yeast showed significant (P≤0.05) decrease in the relative weight of the liver compared to the negative control diet. Relative weights of breast and thigh were significantly (P≤0.05) higher in birds fed 1% yeast than those fed 3% yeast. There were linear decreases in serum cholesterol and albumin of broilers fed graded levels of dietary yeast. It is concluded that yeast can be included in broiler diet at 1% without detrimental effects on performance, and could therefore serve as a natural substitute for antibiotics.

Getting Better Intestinal Health through the Addition of Yeast (Saccharomyces Cerevisiae) Combined with Threonine in Broilers Diets

“…Also, in another assay were noticed that addition of T (2.5-7.5 g/Kg food) findings, in these research, the addition of Sc alone, in the same level used on this experiment, did not modify productive variables (Rezaeipour et al, 2012). Coincidently to this results, in another research, was registered that broilers fed Sc in higher levels to use on this experience (1-3%) and noticed high Consumption but lower Weight Gain (Ahmed et al, 2015). Opposite to this results, we and another researcher noticed better Feed Conversion and increased Weight Gain in broilers fed Sc (0.1-0.75%) (Miazzo et al, 2001(Miazzo et al, , 2003Nilson et al, 2004;Geishari & Kholehipour, 2006;El Naga, 2012).…”

“…Perhaps, the different result must be attributed to the difference in Sc nature and T levels (30% vs 0.25-0.75 g/Kg feed) used in each assay. In another experience were register increased values in carcass performance in broilers fed Sc alone (0.1-1%) (Miazzo et al, 2007(Miazzo et al, , 2011Ahmed et al, 2015). significantly better in broiler received the combination of both additives in all T levels (Table 4 and Figure 2).…”

“…In different assays, it was found that Sc (2-10 g/Kg) added to broiler diets improved their productive performance (Peralta et al, 2008;Haldar et al, 2011;Reisinger et al, 2011;Ahmed et al, 2015). We proved the positive effects of Sc on performance (feed conversion) and carcass quality of broilers fed with yeast alone (0.3-1%) or replacing 1/3 of the premix (0.5-1 g/Kg) during starter and finisher diets (Miazzo et al, 2003(Miazzo et al, , 2005(Miazzo et al, , 2006(Miazzo et al, , 2007Nilson et al, 2004;Peralta et al, 2008).…”

Saccharomyces cerevisiaeas a probiotic feed additive to non and pseudo‐ruminant feeding: a review

“…A decrease in serum cholesterol and serum albumin with increasing dietary yeast levels in broiler diets was observed and no detrimental effects on the birds performance occurred up to an inclusion level of 1% (w/w) (Ahmed et al ) (Fig. ).…”

Effect of Dietary Agaricus bisporus and Auricularia auricula Crude Extract Suplementation on Carcass Quality of Broiler

“…Carcass yield in Table 2 showed that Agaricus bisporus and Auricularia auricula crude extract addition in average 70.6 -73.5%, which is broiler carcass yield at about 70 -75%. In study of 3% yeast cell wall inclusion into broiler diets did not show significant differences compared with oxytetracycline group (Ahmed et al, 2015). Kavyani et al (2012) also reported that 3% Agaricus bisporus inclusion in broiler diet showed 73.3% carcass yield with no significant differences between treatments.…”