Removing tylosin phosphate from finishing diets with increasing roughage concentrations affects growth performance, carcass characteristics, and prevalence of liver abscesses of finishing steers*

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-06-01 DOI:10.15232/aas.2023-02489
A.B. Word , K.J. Karr , B.P. Holland , C.L. Maxwell , S.K. Linneen , P.J. Defoor
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Abstract

Objectives

This study compared standard finishing diets with or without tylosin phosphate at an industry standard roughage concentration, as well as titrated roughage concentrations in finishing diets containing no tylosin.

Materials and Methods

Beef steers (initial BW = 387 ± 14.2 kg; n = 3,340) were used in a randomized complete block design with 12 pens/treatment and 65 or 70 steers per pen. Dietary treatments were (1) 7.0% corn stalks with tylosin (7TYL), (2) 7.0% corn stalks without tylosin (7NT), (3) 13.0% corn stalks without tylosin (13NT), or (4) 19.0% corn stalks without tylosin (19NT). Corn stalks replaced steam-flaked corn on a DM basis.

Results and Discussion

Increased corn stalks linearly increased DMI. Increased corn stalks linearly reduced final BW and ADG, and resulted in poorer G:F. Hot carcass weight was similar between 7TYL and 7NT; however, hot carcass weight (HCW) linearly decreased as corn stalk inclusion increased. Tylosin inclusion resulted in a 32% reduction in liver abscess prevalence (from 19% to 13%). Liver abscess prevalence decreased linearly with increased corn stalks; tylosin use reduced adhered livers, whereas increased corn stalks did not.

Implications and Applications

Replacing steamflaked corn with 13% or 19% inclusion of corn stalks in diets without tylosin phosphate could reduce liver abscess prevalence, but increased roughage may not decrease the severity of the liver abscesses. Importantly, decreased dietary energy density led to increased DMI and reduced HCW in cattle fed to the same days on feed.

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随着粗饲料浓度的增加,从育成日粮中去除磷酸泰乐菌素会影响育成阉牛的生长性能、胴体特征和肝脓肿发病率*。
本研究比较了含有或不含有磷酸泰乐菌素的标准育成日粮(行业标准粗饲料浓度),以及滴定粗饲料浓度(不含泰乐菌素)的育成日粮。材料和方法采用随机完全区组设计,每组 12 栏,每栏 65 或 70 头肉牛(初始体重 = 387 ± 14.2 千克;n = 3,340 头)。日粮处理为:(1)含泰乐菌素的 7.0% 玉米秆(7TYL);(2)不含泰乐菌素的 7.0% 玉米秆(7NT);(3)不含泰乐菌素的 13.0% 玉米秆(13NT);或(4)不含泰乐菌素的 19.0% 玉米秆(19NT)。结果和讨论增加玉米秆可线性增加 DMI。玉米秆的增加线性地降低了最终体重和 ADG,并导致较差的 G:F。7TYL 和 7NT 的热胴体重相似;但是,热胴体重(HCW)随着玉米秆含量的增加而线性下降。添加泰乐菌素可使肝脓肿发病率降低 32%(从 19% 降至 13%)。意义和应用在不添加磷酸泰乐菌素的日粮中添加 13% 或 19% 的玉米秸秆取代蒸汽淀粉玉米可降低肝脓肿发病率,但增加粗饲料可能不会降低肝脓肿的严重程度。重要的是,降低日粮能量密度可增加牛的DMI,并降低相同日粮中牛的HCW。
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来源期刊
Applied Animal Science
Applied Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.00
自引率
6.70%
发文量
68
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Table of Contents Editorial Board Call for Submissions Fabrication yields and allometric growth coefficients of carcass components of serially slaughtered implanted or non-implanted beef steers Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers
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