Investigation of in vitro digestibility and fermentation of diets containing of diferent parts of Siris (Albizia lebbeck)

This experiment was conducted to investigate the digestibility and fermentation parameters of diets containing flower، pod with seed and leaf of siris in sheep by two-step digestion and gas production methods. The experimental diets were including zero، 25، 50، 75 and 100 percent of Siris flower، pod and leaf. The result showed that gas production potential of diet containing 50 percent leaf was greater than other treatments (P<0. 05). Gas production rate of diet containing 75 percent flower showed significant increase compared with the other diets (P<0. 05). Partitioning factor، microbial biomass، biomass efficiency were the greatest for diets containing 100 percent leaf and different levels of pod (P<0. 05). Dry matter digestibility of diets including different levels of siris leaf، 50 percent siris flower and 25 percent siris pod and neutral detergent fiber digestibility of diets including different levels of siris flower and 25 percent Siris pod were higher compared to control diet (P<0. 05). The lowest concentration of ammonia nitrogen was belonged to diets containing 100 percent leaf and pod of Siris (P<0. 05). It could be concluded that Siris leaf، flower and pod with seed of siris can be used instaed of alfalfa in sheep diet and increase digestibility and diet ruminal fermentation.