Growth, performance, and carcass characteristics of feedlot Holstein steers fed ractopamine hydrochloride

被引：4

作者：

Lockard, Cathy L. ^{[1
]}

Richards, Chris J. ^{[1
]}

Lockard, Caleb G. ^{[1
]}

Youngers, Maggie ^{[1
]}

Woolsoncroft, Mariah A. ^{[1
]}

Husz, Taylor C. ^{[1
]}

Wilson, Blake K. ^{[1
]}

Goad, Carla L. ^{[2
]}

Jackson, Todd A. ^{[3
]}

Step, Douglas L. ^{[4
]}

Bernhard, Bryan C. ^{[5
]}

Corbin, Marilyn J. ^{[5
]}

Krehbiel, Clint R. ^{[1
]}

机构：

[1] Oklahoma State Univ, Dept Anim & Food Sci, Stillwater, OK 74078 USA

[2] Oklahoma State Univ, Dept Stat, Stillwater, OK 74078 USA

[3] Oklahoma State Univ, Dept Vet Pathobiol, Stillwater, OK 74078 USA

[4] Oklahoma State Univ, Dept Vet Clin Sci, Stillwater, OK 74078 USA

[5] Zoetis, Parsippany, NJ 07054 USA

来源：

TRANSLATIONAL ANIMAL SCIENCE | 2020年 / 4卷 / 01期

关键词：

beta-adrenergic agonist; carcass quality; feedlot performance; Holstein steers; mobility; ractopamine hydrochloride; IN-PLANT SURVEY; ZILPATEROL HYDROCHLORIDE; FINISHING STEERS; ANIMAL-WELFARE; QUALITY; SUPPLEMENTATION; CATTLE; ATTRIBUTES; OPTAFLEXX; QUANTITY;

D O I：

10.1093/tas/txz157

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Growth-promoting technologies such as implants, ionophores, and beta-agonists improve feedlot performance, efficiency, and carcass characteristics of cattle. The objective of this experiment was to determine the effects of dose and duration of ractopamine hydrochloride (RH) on feedlot performance and carcass characteristics when fed to Holstein steers. A randomized complete block design was used with a 3 x 3 factorial arrangement of treatments with 3 RH doses (0, 300, or 400 mg.steer(-1).d(-1)) fed for 3 durations (28, 35, or 42 d). Holstein steers (n = 855; initial body weight [BW] = 448 +/- 37 kg) were blocked by BW and randomly allocated to 1 of 9 pens (15 blocks; 9 dose x duration treatment combinations) approximately 72 d before harvest. Weekly pen weights, chute temperament scores, and animal mobility were determined during the RH feeding period. At harvest, carcass data were collected on all steers, and tenderness was measured on steaks from 3 or 4 randomly selected steers from each pen and slice shear force (SSF) was determined on one steak selected from each side of the carcass after aging for 14 or 21 d. For feedlot performance, carcass characteristics, and SSF, no dose x duration interactions were observed (P >= 0.11). With increasing RH dose, average daily gain (ADG) and gain-to-feed ratio (G:F) increased linearly (P <= 0.01), whereas BW gain increased linearly with RH dose and duration (P <= 0.01). Hot carcass weight (P = 0.02) and longissimus muscle (LM) area (P <= 0.01) increased linearly with increasing RH dose. The percentage of carcasses in the USDA Yield Grade 2 category increased linearly (P <= 0.01) and percentage of carcasses in the USDA Yield Grade 4 category tended (P = 0.08) to decrease linearly as RH dose increased. In the 14-d aged steaks, the percentage of steaks with SSF <= 15.3 kg decreased linearly (P <= 0.01), whereas the percentage of steaks with >= 20.0 kg SSF increased linearly (P <= 0.01) with increasing RH dose. After 21-d aging, there was a tendency (P = 0.06) for a greater percentage of steaks from steers fed RH to have SSF >= 20.0 kg (2% of total steaks), but no difference (P >= 0.12) in the percentage of steaks with SSF <= 19.9 kg. Final chute temperament (P >= 0.45) and animal mobility (P >= 0.67) scores were not affected by feeding RH. Increasing the dose of RH (300 or 400 mg.steer(-1).d(-1)) fed for 28 to 42 d before harvest increased ADG, G:F, hot carcass weight, and LM area when fed to Holstein steers with no negative effects on behavior or mobility. The percentage of steaks classified as not tender improved when steaks were aged for 21 d from steers treated with RH.

引用

页码：102 / 117

页数：16

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