تأثير مكمل‌هاي آلي و معدني روي بر فراسنجه‌هاي رشد، خصوصيات لاشه و سرم بره‌هاي سنجابي

The effect of organic and inorganic supplements of zinc on growth parameters, carcass characteristics and serum Sanjabi Lambs

هدف از اين مطالعه، بررسي تأثير مكمل روي-متيونين و سولفات روي بر صفات رشد، خصوصيات لاشه و غلظت عنصر روي و عنصر مس سرم خون و غلظت روي (ميلي‌گرم/كيلوگرم) در بافت‌هاي مختلف لاشه و خصوصيات لاشه شامل صفات طولي، وزن بخش‌هاي مختلف و آلايش‌هاي داخلي و خارجي آن در بره‌هاي سنجابي بود. نتايج نشان داد استفاده از مكمل سولفات روي سبب كاهش معني‌دار ماده خشك مصرفي؛ وزن نهايي، وزن لاشه بدون دنبه و طول لاشه نسبت به دو گروه شاهد و مكمل روي آلي گرديد (05/0>P). مكمل روي آلي سبب افزايش‌معني‌دار طول ران و دست گرديد (001/0=P). غلظت روي در دو عضله چهار سر ران (Quadriceps femoris) و راسته (Longissimus dorsi ) تحت تأثير استفاده از مكمل روي آلي يا معدني روي قرار نگرفت ولي غلظت روي در بافت‌هاي پانكراس، شش‌ و قلب بره‌هاي دريافت كننده مكمل روي آلي؛ بيشتر از دو گروه ديگر بود (001/0=P). اندازه‌گيري غلظت عنصر روي در مدفوع نشان داد زيست فراهمي مكمل سولفات روي كمتر از مكمل روي-متيونين مي‌باشد (001/0=P). غلظت عنصر روي و مس سرم در بره‌هاي دريافت كننده مكمل روي آلي و معدني تحت تأثير مكمل معدني روي قرار نگرفت(05/0

The aim of this study was to determine the effects of Zn-methionine (Zn-Met) and Zinc sulfate (ZnSo4) supplementation on growth performance, carcass characteristics, serum zinc and copper and zinc concentrations in some tissue i.e. length, weight, internal and external offal items in Sanjabi lambs. All lambs were slaughtered at end of fattening period and biometry of carcass was determined, also zinc concentration in five carcass tissues were analyzed. The results showed that ZnSo4 supplementation reduced dry matter intake, final body weight, carcass weight without fat-tail and carcass length as compared to the control group (P<0.05). The hind leg and fore leg length increased in the Zn-Met group (p=0.001). The Zn concentration of Quadriceps femoris and Longissimus dorsi were not significantly affected by organic and inorganic Zn supplementations, however, pancreas, lounges and heart concentrations of Zn were higher (P<0.01) in organic Zn groups as compared to other groups. The Zn concentration of feces showed that zinc sulfate bioavailability was lower compared to the Zn-Met group (p=0.001). The concentrations of Zn and Cu of serum were not affected by Zn supplementation in treated lambs (P> 0.05). The result of this study showed that zinc sulfate supplementation reduced lams growth and DMI, however feed efficiency ratio was not affect by treatments. The Zn-Met was not affected on growth of lamb, however the lounges and heart Zn concentrations increased.