The objective of this study was to investigate different levels of crude protein by dietary addition of Cottonseed meal on the growth and performance of Iranian Sannen kids. Twelve Iranian sannen kids were used in a complete randomized design with 60-d periods. Kids were divided equally into three groups. Three treatments were formulated: 1) 14% CP 2) 15% CP and 3) 16% CP. Feed intake was measured every day. The body weight and body measurement were measured at an interval of 15 day prior. Samples of feed and fecal for determination of apparent digestibility in last week were collected. Rumen fluid for determine pH and NH3-N at an interval of 15 days at 3 h post feeding were collected. Statistical analysis was performed using the GLM procedure of SAS (p< 0.05). Treatment means were compared using Duncan’s test. There were no significantly differences in DMI, ADG and feed efficiency between experimental diets, but as the amount protein in the diet increased, DMI, ADG and feed efficiency were tended to increase. Apparent digestibility OM and CP in level of 15% CP were higher than levels of 14 and 16% CP. Conversely, digestibility for ADF and NDF in level of 15% CP were lower than levels of 14% and 16% CP (p> 0.05). The pH and ammonia-N concentration were significantly increased as the of protein level in the diet increased (p< 0.05). The body measurements (Body length, Withers height, Heart girth and Hip-pin interval) were not affected by the experimental diets. In conclusion, the increasing CP levels from 14 to 16% in diet improved feed intake, average body gain and feed efficiency and on apparent digestibility of nutrients and body dimensions did not differ between treatments, therefore growth results showed that recommended 18% dietary CP for Iranian Sannen kids.

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