卢巴贝琼剂量和持续时间对饲养期最后28天、56天或84天计算出的累积氨气排放量和饲养场母牛生长性能的影响

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-09-16 DOI:10.15232/aas.2023-02518

Matt Edmonds , John C. Kube , Janet B. Allen , Michelle Calvo-Lorenzo , David McKenna , Dale Woerner , Mahesh Nair , Ashley Corona , John Scanga , Phil Rincker , K. Camara , M.S. Brown

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引用次数: 0

摘要

我们的目的是描述 lubabegron（Experior 10；Elanco Animal Health，Greenfield，IN）对饲养场肉牛的氨气排放、生长和胴体品质以及动物活动能力的影响。(LUB；0、1.5、3.5 或 5.5 mg/kg DM）和饲喂时间（屠宰前 28、56 或 84 d）。结果与讨论每公斤热胴体重量的计算累计氨气排放量在 28 天后随着 LUB 的增加而减少（线性），在 56 天和 84 天后呈二次反应（LUB × 持续时间）。随着 LUB 的增加，最终收缩体重和 ADG（LUB × 持续时间）随着持续时间的增加而增加（线性），并随着 LUB 的增加而增加（二次方）。随着 LUB 的增加，G:F（LUB × 持续时间）的增加在每个持续时间内呈线性，随着持续时间的增加，G:F 的增加幅度越来越小。当饲喂 0、1.5 和 3.5 毫克/千克 DM 时，母牛 G:F 随持续时间的延长呈线性增长。随着持续时间的延长，母牛DP（LUB × 持续时间）呈二次方增长，随着 LUB 的增加呈线性增长。当饲喂 84 d 时，随着 LUB 的增加，大理石纹评分（LUB × 持续时间）呈二次曲线下降，当饲喂 1.5 或 3.5 mg/kg DM 时，大理石纹评分呈线性下降。随着 LUB 的增加，平均 YG（LUB × 持续时间）呈线性下降。意义和应用饲喂 Lubabegron 可减少每公斤产出的计算氨排放量，减少 DMI ≤0.3 kg/d，胴体热重增加多达 19 kg，56 d 后胴体更瘦，大理石纹评分更低，并且不会改变运输至屠宰后的健康状况或动物活动能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Effects of lubabegron dose and duration on calculated cumulative ammonia gas emissions and growth performance by feedlot steers during the last 28, 56, or 84 days of the feeding period

Objective

Our objective was to characterize the effects of lubabegron (Experior 10; Elanco Animal Health, Greenfield, IN) on ammonia gas emissions, growth and carcass merit, and animal mobility of feedlot steers.

Materials and Methods

Crossbred beef steers were used in a randomized complete block with a 4 × 3 factorial arrangement of dietary lubabegron concentrations. (LUB; 0, 1.5, 3.5, or 5.5 mg/kg of DM) and duration of feeding (28, 56, or 84 d before slaughter). Blocks were slaughtered after an equal time on feed.

Results and Discussion

Calculated cumulative ammonia gas emissions per kilogram of hot carcass weight decreased after 28 d (linear) as LUB increased and responded quadratically after 56 and 84 d (LUB × duration). Steer DMI (LUB × duration) decreased linearly as LUB increased after 28 and 56 d. Final shrunk BW and ADG (LUB × duration) increased (linear) as duration increased and increased (quadratic) as LUB increased. The increase in G:F (LUB × duration) as LUB increased was linear within each duration, with an increasingly smaller magnitude as duration increased. Steer G:F increased linearly as duration increased when 0, 1.5, and 3.5 mg/kg of DM was fed. Steer DP (LUB × duration) increased quadratically as duration increased and linearly as LUB increased. Marbling score (LUB × duration) decreased quadratically as LUB increased when fed for 84 d and decreased linearly when 1.5 or 3.5 mg/kg of DM was fed. Average YG decreased (LUB × duration) linearly as LUB increased. Neither LUB nor duration altered the distribution of mobility scores at lairage before slaughter.

Implications and Applications

Feeding lubabegron resulted in lesser calculated ammonia emissions per kilogram of output, ≤0.3 kg/d lesser DMI, up to 19 kg more hot carcass weight, and leaner carcasses with a lesser marbling score after 56 d and did not alter health status or animal mobility after transport to slaughter.

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