بررسی ارزشیابی بقایای بوجاری ذرت به عنوان بخشی از جیره خوراکی گوساله های پرواری

A 4x4 Completely Randomized block Design experiment was conducted using 32 Holstein calves of 4 weights. Animals were randomly assigned to treatment groups within eaqh weight category. Within the four weight categories animals recived one of four concentrates:(1) a concentrate containing 45 percent barley: (2),(3) and (4) concentrates containing 15,30,45 percent " Corn Winnowing Residues " (CWR) substituted for barley respectively. All animals were slaughtered at the end of the experiment (day 150) to collect carcass weights and to calculate dressing percentages, daily weight gains, feed effeciencies, carcass composition (leen meat,fat and bone percentages) and the feed cost to produce each kilogram of gain. The results obtained from this experiment sugiest that treatment differences of daily weight gain, feed effeciency and carcass composition were not statistically significant (P> .O1). The highest dressing percentage was 53:71 ,percent for grOUp A calves. Figures fot groups B,C and D were 52.69, 53.23 and 51.67 percent respectively. The average dressing percentage of groups A,B, and C did not differ significantly (P> .05). On the other hand the average dressing percentage of group D calves was significantly lower than that of groups A and C (P<.OS). This was to be expected due to tbe differences in average final livewight of calves of different groups. The lowest and highest feed costs to produce each kilogram of gain belonged to groups D and A respectively, this was due ,to the lower price per kilogram of " CWR ".