Evaluation of tylosin phosphate supplementation over strategic durations on the incidence and severity of liver abscesses in cattle fed in confinement

被引：3

作者：

Linneen, S. K. ^{[1
]}

Maxwell, C. L. ^{[1
]}

Word, A. B. ^{[2
]}

Davis, S.

Holland, B. P. ^{[2
]}

Kayser, W. C. ^{[1
]}

Homm, J. W. ^{[1
]}

Koers, W. ^{[3
]}

Rincker, P. J. ^{[1
]}

机构：

[1] Elanco Anim Hlth, Greenfield, IN 46140 USA

[2] Cactus Res, Amarillo, TX 79101 USA

[3] Bos Tech Res, Salina, KS 67401 USA

来源：

APPLIED ANIMAL SCIENCE | 2023年 / 39卷 / 03期

关键词：

beef cattle; liver abscesses; tylosin phosphate; CARCASS CHARACTERISTICS; FEEDLOT PERFORMANCE; ABNORMALITIES; EFFICIENCY; MONENSIN;

D O I：

10.15232/aas.2022-02378

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Objective: The objective of these studies was to deter-mine the effectiveness of tylosin phosphate (TP) supple-mentation over strategic durations on the incidence and severity of liver abscesses (LA) in cattle fed in confine-ment. Materials and Methods: In Exp. 1, a total of 3,360 steers (initial BW = 377 & PLUSMN; 33 kg) were used in a random-ized complete block design with 6 treatments (48 pens; 8 replications). Treatments included no TP (NT) or TP provided the first 26% (FIRST-26), 50% (FIRST-50), or 75% (FIRST-75) or last 50% (LAST-50) of the 163-d feed-ing period or continuously for 163 d (CONT). In Exp. 2, a total of 3,625 heifers (initial BW = 267 & PLUSMN; 3 kg) were used in a randomized complete block design (48 pens; 8 replications). Treatments included no TP (NT) or TP pro-vided the first 17% (FIRST-17), 50% (FIRST-50), or 74% (FIRST-74) or last 83% (LAST-83) of the 217-d feeding period or continuously for 217 d (CONT). Results and Discussion: In Exp. 1, total percent-ages of LA were lowest for the FIRST-75 and CONT and greatest for steers in NT or LAST-50 treatments, with FIRST-26 and FIRST-50 intermediate (P < 0.01). For liv-er scores, total A+ were least for steers in the FIRST-75, which were similar to the FIRST-26, FIRST-50, and CONT (P = 0.03). Steers in NT had the greatest A+ liver abscess incidence and were similar to steers in the FIRST-26 and LAST-50 treatments. In Exp. 2, heifers in the LAST-83 and CONT treatments exhibited the low-est (P < 0.01) total LA percentage compared with NT, FIRST-17, FIRST-50, and FIRST-74 treatments. Heifers in the LAST-83 and CONT treatments had the least (P =0.04) total A+ LA compared with the greatest incidence for heifers in NT and FIRST-17 treatments. Implications and Applications: Reducing use of TP to approximately 80% of the feeding period was effective in reducing incidence of LA, although the greatest reduc-tion in LA occurred when TP was fed for the duration of the feeding period.

引用

页码：168 / 177

页数：10

共 23 条

[1] Liver abscesses in cattle: A review of incidence in Holsteins and of bacteriology and vaccine approaches to control in feedlot cattle [J].