The effects of adding inactive yeast culture (Saccaromycescerevisiae) to rations prepared with different quality roughages on fattening performance, nutrient digestibility, some rumen parameters and carcass characteristics in lambs

In this study, it is aimed to determine the effects of the addition of inactivated yeast metabolite (Saccharomyces cerevisiae) to the rations prepared with roughages of three different qualities, including alfalfa hay, meadow hay and wheat straw on to fattening performance for 2,5-month old lambs, digestibility of nutrients, some rumen parameters and carcass yield.The study has been maintained for a total of 70 days including the first 10 days of feed adaptation period and 60 days of fattening period with a total of 36 Anatolia Merino male lambs. During the fattening period, lamb fattening feed containing 2730 Mcal / kg DM ME and 17.41% crude protein (CP) has been given ad-libitum to lambs. The study has been conducted on 6 groups of 3x2 factorial design and 6 replications in each group by creating 6 trial or groups with each of the roughage (alfalfa hay, meadow hay and wheat straw) including three inactive yeast metabolites and three without additives. Inactive yeast metabolite has been given as 7 g / day to groups containing an additive. It has been determined that inactive yeast metabolites addition to rations prepared with roughages of different quality hasn't effected the lambs body weight (LW), body weight gain (LWG), daily body weight gain (DBWG), daily average feed consumption and feed convertion ratio(FCR) during 8 weeks of fattening (P>0.05). The digestibility of crude fiber (CF) (P<0.05) and hemicellulose (P<0.01) was affected by different roughages used in the ration, the increase in digestion of acid detergent fiber (ADF) (P<0.01) and cellulose (P <0.001) with inactive yeast metabolite addition to rations has been observed. It has been seen that the effects of feed x additive interactions on acetic acid, propionic acid and total volatile fatty acids (TVFA) concentrations is significant (P<0.01). Ammonia concentration has been affected by the roughage factor and also the ratio of acetic acid: propionic acid in rumen has been influencedby the factor of additive (P<0.05). It has been determined that the roughage or additive factor does not affect butyric acid, isobutyric acid, valeric acid, isovaleric acid and ruminal pH levels (P>0.05). Carcass characteristics and some internal organ weights have not been affected by the treatments, at the end of the fattening period (P>0.05). It has been seen that during the experimental period, the environmental factors (temperature and humidity) to be caused by seasonal differences varied significantly (P<0.05).Consequently, it has been determined that fattening performances of lambs and carcass yields has not been affected by use of roughage in different qualities in lamb fattening rations with concentrate feed and by addition of Saccharomyces cerevisiae inactive yeast metabolite to rations prepared by using different roughage sources, that the increase in degree of digestibility of some cell wall elements has been ensured and that some rumen parameters has changed positively.