J. Anim Sci.
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J. Anim Sci. 1986. 62:1215-1219.
© 1986 American Society of Animal Science
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Use of Chlortetracycline for Treatment of New Feedlot Cattle1,2,3,

T. W. Perry4, J. G Riley5, M. T. Mohler4 and R. V. Pope5

Purdue University, West Lafayette, IN 47907 and Kansas State University, Manhattan 56650

Abstract

Two 56-d shipping fever trials of similar design were conducted the same season (fall) at Kansas State University (KSU) and at Purdue University (PU) to compare various levels of chlortetracycline (0 or 350 mg · head–1 · d–1 continuously or 1, 2 or 4 g · head–1 · d–1 for the first 14 d). Weanling crossbred steer calves were utilized (210 head of Angus x Simmental, averaging 197 kg, at KSU; 268 head of Angus x Hereford, averaging 192 kg, at PU). For the first 28 d in the KSU trial (October 13 to December 8), cattle that received 4 g · head–1 · d–1 the first 14 d gained more rapidly (P<.05) than cattle fed 350 mg · head–1 · d–1 continuously or than the controls that received no chlortetracycline (CTC; 1.05 vs .92 or .93 kg/d, respectively). Cattle that received 4 g CTC · head–1 · d–1 for the first 14 d required less (P<.05) dry matter per kg gain than steers that received 350 mg · head–1 · d–1 continuously over the 56-d period. In the PU trial (October 6 through December 1), all CTC treatments resulted in increased feed efficiency (P<.05) over the controls through 28 d, and the 4 g · head–1 · d–1 for 14 d and 350 mg · head–1 · d–1 continuously, improved feed efficiency over the other groups for the 56-d period. Daily gain at 28 d was improved (P<.05) in the PU trial by 350 mg · head–1 · d–1 continuously or 2 or 4 g · head–1 · d–1 for 14 d; at 56 d, 350 mg · head–1 · d–1 continuously or 4 g · head–1 · d–1 for 14 d improved (P<.05) gain.

Footnotes

1 Journal Paper No. 85-257-J, Kansas State Univ. Agr. Exp. Sta.

2 Journal Paper No. 10,217, Purdue Univ. Agr. Exp. Sta.

3 The authors acknowledge the American Cyanamid Co., Princeton, NJ for financial support, chlortetracycline and other materials.

4 Dept. of Anim. Sci., Purdue Univ.

5 Dept. of Anim. Sci. and Ind., Kansas State Univ.




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E. D. Reid, P. S. Erickson, S. Hodgdon, E. Lennon, and P. C. W. Tsang
Chlortetracycline supplementation of yearling dairy heifers
J Anim Sci, September 1, 2006; 84(9): 2406 - 2409.
[Abstract] [Full Text] [PDF]


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