Everglades Station Mimeo 61-21 June 22, 1961
Feeding Value of Various Enzyme Preparations for Cattle Being
Fattened on Pasture -l 2/
H. L. Chapman, Jr., C. E. Haines and R. W. Kidder
Considerable interest has developed during recent times concerning the
merits of enzyme preparations in rations for fattening cattle. There are
many types of enzyme preparations which can be used. Some enzymes are spec-
ific for carbohydrates, some for proteins and some for fats. Considerable
work is necessary before the use of enzymes in fattening rations can be
properly evaluated and a great deal of research is currently in progress.
However, little work is being done with cattle being fattened on pasture.
The purpose of the study reported in this paper was to determine the merits
of two different enzyme preparations when added to fattening rations for
steers being fattened on Roselawn St. Augustinegrass pastures.
Forty-eight two-year-old predominantly Hereford and crossbred steers,
having an average high utility slaughter grade, were divided into six/equal
groups of eight animals each, on the basis of weight and breed composition.
They were then allowed at random to the experimental treatments. The ex-
perimental design was as follows:
1 Pasture only
2 Pasture + 6 Ibs. feed/animal/day
3 Pasture + concentrate feed full fed ',
4 Treatment 2 + Zymo-Pabst -.
5 Treatment 2 + Rhozyme F-4D
6 Treatment 3 + Zymo-Pabst !
i/ Acknowledgement is made to L.V. Morris, Tom Swager, J.V. McLeod and others
who assisted in the conduction of this experiment.
2/ Zymo-pabst was furnished by Pabst Brewing Company, Milwaukee, Wisconsin
and Rhozyme F-4D by Rohm and Haas Company, Philadelphia, Pennsylvania.
3/ Associate Animal Nutritionist, Assistant Animal Husbandman, and Animal
Husbandman, Everglades Experiment Station.
The ingredient composition of the experimental rations was as follows:
Ingredient rations(lbs.) ration(lbs.)
Ground snapped corn 400 487
Dried citrus pulp 383 400
Cottonseed meal (41%) 200 100
Urea-262 --- 8
Mineral mixture 17 5
Rhozyme feed supplement F-4D was fed at the rate of 3.40 grams per head per
day and Zymo-Pabst at the rate of 3.0 grams per head daily. The experimental
animals were treated with 6 ounces of phenothiazine at twenty-one day inter-
vals prior to being placed on test. The steers were on feed for 140 days,
starting November 9, 1960. At the conclusion of the feeding period, the
animals were transported to a packinghouse in Miami for slaughter. In-
transit shrink and carcass data were also obtained to determine differences
due to treatments.
A summary of average daily gains, carcass data and returns, above steer
and feed costs, are included in Table 1. Steers on pasture alone had an
average daily gain of 1.05 pounds as compared to 1.64 pounds for steers
receiving 6 pounds of feed per day and 2.70 pounds for steers on full feed.
Neither enzyme preparation stimulated the rate of gain of steers receiving
the limited intake of concentrate feed. Steers receiving the full feed of
concentrate had 6.5% more gain when Zymo-Pabst was included in the feed.
The enzyme preparations had no significant affect on shipping shrink, dress-
ing percent, cooler shrink or change in grade. However, steers receiving
the enzymes in their feed increased 1/3 of a grade more in slaughter grade,
on the average, than the steers not receiving the enzymes.
The average daily gains for each weight period are presented in Table 2.
These data indicate that the enzymes exerted more affect on rate of gain
during the first 56 days on feed, particularly for the steers on the limited
Table 1. Summary of average weight changes, carcass data and return,per
steer, for steers receiving various levels of feed intake with
and without enzymes.
Limited Limited Full
feed + feed + feed +
Pasture Limited Full Zymo- Rhozyme Zymo-
only feed feed Pabst F-4D Pabst
Final weight (ibs.) 839 923 1048 912 919 1092
Initial weight (lbs.) 692 692 661 679 692 702
Total gain (Ibs.) 147 231 367 233 227 390
Daily gain (Ibs.) I/ 1.05 1.65 2.62 1.66 1.62 2.79
Intransit shrink (%) 3.52 4.54 3.80 5.08 4.50 3.80
Dressing percent I/ 54.94 55.84 62.74 55.96 56.16 61.21
Cooler shrink (%) 1[ 1.20 0.58 0.63 0.68 0.73 0.73
Change-in-grade (173) 1/ 1 1 4 2 2 5
Final value ($) 163.52 182.42 251.48 179.37 181.90 254.52
Initial value ($) 139.82 139.22 137.35 135.06 135.53 140.63
Feed cost 2/ 0.00 25.76 102.14 25.76 25.76 101.32
Return above feed and
steer cost ($) 25.70 17.44 11.99 18.55 20.61 12.57
I/ Effect of level of feed intake significant at P = 0.01
2/ Does not include enzyme cost.
Table 2. Summary of average daily gains by weight period (Ibs.)
Days on feed
Treatment __2 56 64 112 140
Pasture only 2.11 1.64 1.32 1.06 1.05
Limited feed 1.78 1.86 1.77 1.68 1.65
Full feed 3.03 2.77 2.71 2.72 2.62
Limited feed + Zymo Pabst 2.57 2.27 1.96 1.81 1.66
Limited feed + Rhozyme F-4D 2.82 1.95 1.67 1.49 1.62
Full feed + Zymo-Pabst 3.28 2.86 2.88 2.96 2.73