The current study aimed to evaluate the nutritional potential of some rangeland plants by in vitro gas production kinetics and ruminal fermentation parameters in the Torbat-e Jam region using a meta-analysis approach. A comprehensive literature searches in the scientific databases was carried out to identify studies that investigated the variables of interest. The data analyzed were extracted from 13 peer-reviewed publications. The effect size of all outcomes was reported as a standardized means difference (SMD) with 95% confidence intervals (CI). Q test and I2 were calculated to determine the heterogeneity, and a meta-regression was also used to investigate sources of heterogeneity. A significant increase for 24 h in vitro gas production (IVGP) was observed (P<0.01). Among the estimated gas parameters, potential GP (bgas) and fractional rate of GP (cgas) were increased significantly (P<0.05). Also, short chain fatty acids (SCFA) (P<0.05), microbial protein yield (MPY) (P<0.01), and ammonia nitrogen (NH3-N) (P<0.01) of culture medium were increased. The values of I2 (>50) and Q (P<0.05) for 24 h IVGP, bgas, cgas, SCFA, MPY and NH3-N indicated high heterogeneity. No publication bias was found for 24 h IVGP, bgas, and SCFA. With the evaluation of funnel plots, only one study on the right of each plot indicates publication bias for cgas, MPY, and NH3-N. A strong regression relation (P<0.01) between some chemical compositions (dry matter, crude protein, neutral detergent fiber, and acid detergent fiber) and MPY and NH3-N was suggested from meta-regression analysis. In conclusion, the current meta-analysis confirmed that there were differences in fermentation parameters among all rangeland plants. However, all plants species had a relatively high potential nutritive value. According to the reported fermentation parameters, it seems that most of the Torbat-e Jam rangeland plants species have high nutritional value in small ruminant feeding. More in vivo and in vitro studies are needed to assess the other nutritive values and their effects on animal performance. تفاصيل المقالة

Bentonite is considered the most effective adsorbent for aflatoxin (AF) decontamination, and recent studies have shown that changing its structure in nano form improves its physicochemical properties and chemical stability. This study was aimed to evaluate the effectiveness of different types of bentonites as binders on performance, plasma metabolites, and aflatoxin M1 (AFM1) levels in contaminated milk of Baluchi ewes. The study was conducted with 12 ewes randomly assigned to four different experimental diets. The experi-mental diets were: (1) control (the basal diet had no supplements and contained bakery waste naturally con-taminated with AF); (2) control diet supplemented with natural bentonite (NB) (5 g/kg DM); (3) control diet supplemented with modified bentonite (MB) (5 g/kg DM) and (4) control diet supplemented with magnetic bentonite nanocomposite (MBNC) (5 g/kg DM). The study found that adding bentonite clays to the diet of ewes resulted in increased milk yield (P0.05). The study also found that increasing aflatoxin B1 (AFB1) intake resulted in a decreased carryover of AFB1 into AFM1 (P<0.01), with MBNC having the lowest carryover compared to other treatments (P<0.01). These results suggest that modification of bentonite structure in nanocomposite form improves chemical stability, physicochemical properties, and efficiency as novel toxin binders for crops and animal products. تفاصيل المقالة