01 تیر 1403
حسين رجائي شريف آبادي

حسین رجائی شریف آبادی

مرتبه علمی: استادیار
نشانی: ملایر- دانشگاه ملایر- دانشکده کشاورزی-گروه علوم دامی
تحصیلات: دکترای تخصصی / تغذیه دام
تلفن: +98-9137243262
دانشکده: دانشکده کشاورزی

مشخصات پژوهش

عنوان
Growth performance and nitrogen retention in lambs fed diets containing two different levels of crude protein supplemented with pistachio by-product extract as a source of tannins
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Growth performance, pistachio by-product, lamb, N retention, tannins
سال
2014
مجله RESEARCH OPINIONS IN ANIMAL & VETERINARY SCIENCES
پژوهشگران حسین رجائی شریف آبادی

چکیده

The effects of pistachio by-products aqua extract (PBE) on growth performance and retention of dietary nitrogen (N) were investigated in finishing lambs fed diets containing 11.3% DM (low protein; LP) or 13.9% DM (high protein; HP) crude protein. Two groups (n = 10) of Baluchi ram lambs (4-5 months old, 26.25±3.30 kg initial BW) were allotted to LP and HP treatments. In each group, one half of the lambs received experimental diets mixed with 500 ml liquid fresh PBE per kg DM of diet. Thus, four experimental diets were tested: LP diet without PBE supplementation; LP-PEB, LP diet with PBE supplementation; LP+PBE, HP diet without PBE supplementation; HP-PBE and HP diet with PBE supplementation; HP+PBE. Feed intake, average daily gain (ADG) and feed conversion ratio (FCR) were recorded for a 50 d experimental period. Plasma urea (PUN) and ruminal NH3-N concentrations were measured at 0, 2 and 4 h after morning feeding on the 35th d of the experiment. Apparent total tract digestibility of DM, organic matter (OM) and N as well as urinary losses and retention of N were also determined for 5 days at the end of the experiment. Although there was a tendency for feed intake to be lower (P=0.102) in LP compared with HP fed lambs, the dietary CP level had no effect on ADG and FCR. In contrast, PBE supplementation improved both growth rate (P=0.021) and FCR (P=0.104) of lambs. The urinary losses of N and also PUN and ruminal NH3-N concentrations at h 2 and 4 after feeding were decreased and the retention of N was increased by PBE supplementation of diets. However, these effects of PBE were only significant in the lambs fed HP diet. The concentrations of PUN (0 and 4 h after feeding) and ruminal NH3-N (4 h after feeding) were affected positively by dietary CP level. Although the lambs feeding on the LP diet retained a higher percentage of N intake or N digested, no difference in daily N retained was observed between LP and HP fed lambs. The experimental treatments had no effect on