Effect of Rice Hulls as a dietary fiber source on growth performance and intestinal morphology in broiler chickens.

Abazari, Ali and Navidshad, Bahman and Mirzaei Aghje Gheshlagh, Farzad and Nikbin, Saeed (2015) Effect of Rice Hulls as a dietary fiber source on growth performance and intestinal morphology in broiler chickens. Masters thesis, university of Mohaghegh Ardabili.

Text (تاثیر پوسته برنج به عنوان منبع فیبر خوراکی بر عملکرد رشد وریخت شناسی روده کوچک جوجه های گوشتی) Ali Abazari.pdf Download (686kB)

Abstract

To evaluate the effect of level and particle size of rice husk as a source of fiber on the growth performance , carcass yield and morphology of the small intestine of chickens, two hundred day old broiler chickens Ross (308), were used in a completely randomized design with 5 treatments and 4 replicates with 10 birds each. The diets consisted of a control diet without rice husk, and 4 diets containing 0.75% and 1.5% rice husk with a particle size smaller than 1 mm or1-2mm.. The Values for feed intake, weight gain and feed conversion ratio(FCR)were measured during the growing and finishing periods.The morphology of the small intestine and carcass characteristics were measured at the end of the experiment. Dietary inclusion of rice hulls had significant effects on growth performance in grower phase and whole the 42-day rearing period (P <0.05).The diets containing 1.5 percent rice hulls with a particle size between 1 to 2 mm in grower period had highest daily gain and lowest FCR and the diets containing 0.75 percent rice hulls with a particle between 1to 2 mm had the highest daily gain and lowest FCR in 42-day breeding period(P <0.05). The lowest daily gain and feed intake in finisher period and whole the 42-day rearing period was observed in the control group and the highest daily feed intake and feed conversion ratio were observed in the diets containing 0.75 percent rice hulls with a particle size below 1 mm. Using rice hulls had no significant influence on carcass yield (P <0.05) but the best carcass ratio (carcass weight relative to live weight) was found in the group that was consumed the diets containing %0.75 rice hulls, with a particle size between 1 and 2 mm and the lowest was found in husk free diet consumer group. The dietary fiber concentration was changed the ratio of liver weight to body weight (P <0.05) so that the birde fed the diet containing %0.75 rice hulls with particle size below 1 mm had the lowest and the control group had the highest proportion,respectively.The diet containing % 0.75 rice - hulls wiht particle size below 1 mm have the lowest ratio of abdominal fat and intestinal length to live weight. Generally, the best results were observed with the diets containing 0.75% rice hulls with particle size between 1 and 2 mm. At 42 days of age after slather, 1 cm from the central part of the duodenum, jejunum and ileum were collected from 5 birds from each treatment, and sent to lab to preparing the tissue slides.In the duodenum and jejunum sections using of rice husk in broiler diets reduced the villus height compared to the control group. However, in the duodenum the villus height in RBH treatment was higher than other treatments. In the Duodenum, the largest and lowest numbers of goblet cells per 100 square micrometers of tissue were found in the control and RBH treatments, respectively. In the jejunum and ileum the situation was slightly different, so that the maximum and lowest numbers of goblet cells were observed in the RSL and control groups. In duodenum, the highest and the lowest Crypt depth were observed in the RBH and control treatments, respectively(p<0.01). In the jejunum, the ratio between villus height and crypt depth in treatments RBH and RBL were higher than control group and experimental diets were not affected this measure in the ileum. The results showed that regardless of the dietary level and particle size, use of rice husk was weakened intestinal morphological traits in broiler chickens.

Actions (login required)

View Item