A study was carried out to investigate the effect on Balouchi lambs of feeding a high level of pistachio by-products (PB). Twenty-eight male lambs, with an initial BW of 18.3 ± 1.9 kg, were allocated to 4 dietary treatments in a completely randomized designed for a period of 3 mo. Four diets containing 0, 10, 20, or 30% PB were fed to the lambs in a TMR ad libitum. The average fi nal BW of lambs that were allocated to diets containing 0, 10, 20, and 30% PB were 40.0, 41.0, 38.7, and 40.0 kg, respectively. Mean daily BW gain was 224.5, 259.4, 221.0, and 215.6 g/d, respectively. The respective average feed intake was 1,182.8, 1,215.7, 1,181.1, and 1,161.5 g/d, respectively. Feed conversion ratio was 6.73, 6.22, 7.56, and 7.11 for the above diets. Diet containing high levels of PB did not affect the daily BW gain, BW, or feed conversion ratio of the lambs (P > 0.05). Such a trend was found for some other parameters, such as slaughter and dissection data of the experimental animals. There were no signifi cant effects of treatments on any hematology parameters (P > 0.05). It was concluded that PB could be fed to the fattening lambs up to 30% without any adverse effects on performance or health parameters.

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