Experiment 133-c


 The purpose of this study was to determine the value of the cobalt pellet
for yearling steers in the Clewiston area. It was conducted at the Hayes I., -h,
from February 3, 1960 to September 7, 1960.

 One hundred and fifty three grade Brahman yearling steers were used. The
experimental animals had been treated twice for liver flukes at the time of
weaning. At the initiation of the experiment each animal received 3 ounces
of a phenothiazine drench made of 7 pounds of active ingredient per 3 gallons
of water. This treatment was repeated three weeks later. As in the other
two studies, the experimental treatment was used in addition to the normal
management practices followed at the ranch. At the beginning of the study
the steers were grazing Fangolagrass, on a mucky-sand soil. They were re-
ceiving mineral-fortified blackstrap molasses, free choice, plus 300 pounds
of a 41 percent pellet per day for the 153 steers. The treated animals were
each given one cobalt bullet. The experimental results are presented in
table three.


Table 3. Summary of average weight changes of yearling steers at Hayes
 Ranch, from 2-3-60 to 9-7-60.

 No cobalt Cobalt
 bullet bullet

Number of animals 73 80
Ave. initial wt. (ibs.) 343 343
Ave. final wt. (lbs.) 553 561
Ave. weight gain (Ibs.) 210 218


 There was a higher average increase of 8 pounds per
receiving the cobalt bullet as compared to those not.


animal more for those