Performance of Feedlot Calves Fed Hydroponics Fodder Barley

This experiment was conducted to evaluate the effect of barley green fodder produced by hydroponics system on the performance of feedlot calves. In a completely block randomized experiment, ۲۴ cross bred (Holstein×Local) male calves were assigned randomly to one of the two treatments (diets) that were either control (grain barley) or hydroponic barley green fodder (BGF) that was included to provide ۲۲.۸ percent of the total diet on dry matter basis. Seed grade barley was grown in a hydroponics chamber system where the growth period was adjusted for ۶ days. Body weigh gain was not significantly different between the treatments, but the animals that had received the control diet had higher (P< ۰.۰۵) dry matter intake than those fed BGF diet. There was a tendency (P= ۰.۱۹۹) toward differences in feed efficiency due to dietary treatments. From economical point of view, feed cost increased up to ۲۴ percent when the calves were offered BGF, because of the costly production of hydroponics green forage. Although the mass production of fresh fodder was about ۴.۵ times per kg of barley grain, this was due to water absorption during germination and growth period. Nevertheless, the dry matter obtained was less than the initial barley grain and further dry matter losses were found in the green fodder. These findings suggest that green fodder had no advantage over barley grain in feedlot calves, while it increased the cost of feed.