Progress Report 20 May, 1954
THE VALUE OF A COMBINATION OF ANTIBIOTICS VS. SINGLE ANTIBIOTICS
FOR YOUNG DAIRY CALVES 5
C. A. .Lassiter, T. W. Denton and J. W. Rust
Thirty-two Jersey and Holstein calves (20 Jerseys and 12 Holsteins) 2 to 3 W
days old were raised on a limited milk—starter—hay system to evaluate a combination
of aureomycin and terramycin versus the single antibiotics for young dairy calves.
Milk was fed at the daily rate of 8 per cent of body weight for the first 21 days of
life; thereafter, the amount of milk fed was gradually reduced until the calves were
completely off of milk at 49 days of age. ·
The calves had all they wanted to eat of an excellent quality alfalfa hay, and
one of the four calf starters shown in table l was fed up to a maximum of 4 pound
daily beginning at 1 week of age. The antibiotic feeding supplements were fed at a
rate to furnish 75 milligrams of crystalline antibiotic per calf daily for the first 49
days. The supplements were placed in the starters thereafter.
The results are given in the following tables.
Table 1.
Composition of Experimental Starters
l 2 3 4
(1b1 (lb) (lb)  )
Soybean oil meal ·L~¢— 50 50 50 50
Crimped oats ··;··- 120 120 120 120
Ground yellow corn A - - 80 80 80 80
Wheat Bran . · · A · · 50 50 50 50
Distillers solub1es(72% corn) 100 100 100 100
Steamed bonemeal ···· 5 5 5 5
Vitamin A and D feed (grams) 200 200 200 200
Aurofac ZA (grams/lb.) · I — 3 - 1. 5
TM- (grams/lb.) · · · - - - 2.5 1.25
Analysis in percent .—
Dry matter eis·»·· 92.8 91.3 91.8 91.9
Crude protein -··s·Ve 21.5 20.6 21.7 21.8
Ether extract . ..... 5.0 5.0 5.0 5.0
Crude fiber. . . . . . 6.0 5.9 5. 8 6.0
Nitrogen—free extract . . . 53.1 53.0 52.1 51. 8
. Ash. . . . . . . 7.2 6.8 7.2 7.3
Kentucky Agricultural Experiment Station
University of Kentucky
Lexington