Effects of ractopamine hydrochloride on growth performance, carcass characteristics, and physiological response to different handling techniques1,2

2017 ◽  
Vol 95 (5) ◽  
pp. 1977-1992 ◽  
Author(s):  
J. A. Hagenmaier ◽  
C. D. Reinhardt ◽  
M. J. Ritter ◽  
M. S. Calvo-Lorenzo ◽  
G. J. Vogel ◽  
...  
Keyword(s):  
Growth Performance ◽  
Physiological Response ◽  
Carcass Characteristics ◽  
Ractopamine Hydrochloride

Effects of ractopamine hydrochloride on growth performance, carcass characteristics, and physiological response to different handling techniques

2017 ◽  
Vol 95 (5) ◽  
pp. 1977 ◽  
Author(s):  
J. A. Hagenmaier ◽  
C. D. Reinhardt ◽  
M. J. Ritter ◽  
M. S. Calvo-Lorenzo ◽  
G. J. Vogel ◽  
...  
Keyword(s):  
Growth Performance ◽  
Physiological Response ◽  
Carcass Characteristics ◽  
Ractopamine Hydrochloride

scholarly journals Effects of ractopamine hydrochloride supplementation on feeding behavior, growth performance, and carcass characteristics of finishing steers1,2

2019 ◽  
Vol 3 (4) ◽  
pp. 1143-1152
Author(s):  
Ronald J Trotta ◽  
Kasey R Maddock Carlin ◽  
Kendall C Swanson
Keyword(s):  
Feeding Behavior ◽  
Growth Performance ◽  
Treatment Period ◽  
Radio Frequency Identification ◽  
Animal Health ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Eating Time ◽  
Total Period ◽  
Ractopamine Hydrochloride

Abstract Ractopamine hydrochloride (RAC) is a β-adrenergic agonist that functions as a repartitioning agent to improve muscling in feedlot cattle. Many studies have investigated the effects of RAC on growth performance and carcass characteristics; however, there is minimal information about the influence of RAC on feeding behavior. Sixty-nine steers (body weight [BW] = 364 ± 3.9 kg) predominately of Angus and Simmental breeding were subjected to a 126-d (n = 46) or 154-d (n = 23) feeding period and randomly assigned to one of two treatment groups: supplementation to provide 0 (CON; n = 34) or 267 ± 4.9 mg/d of RAC (n = 35). Ractopamine was provided as Optaflexx 45 at 0.024% of the diet (dry matter [DM] basis; Elanco Animal Health, Greenfield, IN). Dietary treatments were fed the final 42 d in the feed yard (treatment period). Feeding behavior and growth performance were measured using radio frequency identification tags and the Insentec feeding system. Following the final day of treatment, steers were slaughtered and carcass measurements were recorded. Data were analyzed using MIXED models in SAS. There were no differences in BW, average daily gain (ADG), DM intake (DMI), gain:feed ratio (G:F), or feeding behavior during the pretreatment period (P > 0.44). Ractopamine supplementation increased G:F during the treatment period (P = 0.02) and during the total period (P = 0.03) and tended to increase ADG during the treatment and total period (P ≤ 0.08). DMI was not affected during the treatment or total period (P > 0.67). Eating time per visit, per meal, and per day were decreased (P < 0.02) in steers supplemented with RAC during the treatment period. DMI per minute was increased (P = 0.02) in steers supplemented with RAC. Hot carcass weight, dressing percentage, and 12th rib fat were not influenced by RAC supplementation. Ractopamine supplementation decreased marbling (P = 0.008) and kidney, pelvic, and heart percentage (P = 0.04) and increased longissimus muscle area (P = 0.01). These data demonstrate that RAC supplementation for 42 d improves feed efficiency, increases the rate of DMI without altering DMI, and increases muscling in finishing cattle.

Evaluation of ractopamine hydrochloride (Optaflexx) on growth performance and carcass characteristics of finishing steers across different feeding durations1

2017 ◽  
Vol 95 (1) ◽  
pp. 485-498 ◽  
Author(s):  
C. J. Bittner ◽  
M. A. Greenquist ◽  
D. B. Burken ◽  
A. L. Shreck ◽  
J. C. MacDonald ◽  
...  
Keyword(s):  
Growth Performance ◽  
Carcass Characteristics ◽  
Finishing Steers ◽  
Ractopamine Hydrochloride

Effect of handling intensity at the time of transport for slaughter on physiological response and carcass characteristics in beef cattle fed ractopamine hydrochloride

2017 ◽  
Vol 95 (5) ◽  
pp. 1963 ◽  
Author(s):  
J. A. Hagenmaier ◽  
C. D. Reinhardt ◽  
S. J. Bartle ◽  
J. N. Henningson ◽  
M. J. Ritter ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Physiological Response ◽  
Carcass Characteristics ◽  
Ractopamine Hydrochloride

Evaluation of ractopamine hydrochloride (Optaflexx) on growth performance and carcass characteristics of finishing steers across different feeding durations

2017 ◽  
Vol 95 (1) ◽  
pp. 485
Author(s):  
C. J. Bittner ◽  
M. A. Greenquist ◽  
D. B. Burken ◽  
A. L. Shreck ◽  
J. C. MacDonald ◽  
...  
Keyword(s):  
Growth Performance ◽  
Carcass Characteristics ◽  
Finishing Steers ◽  
Ractopamine Hydrochloride

scholarly journals Effects of Ractopamine Hydrochloride on Growth Performance and Carcass Characteristics in Wool and Hair Lambs

2013 ◽  
Vol 12 (2) ◽  
pp. e32
Author(s):  
Ángel M. Romero-Maya ◽  
José G. Herrera-Haro ◽  
Juan M. Pinos-Rodríguez ◽  
Juan C. García-López ◽  
Ricardo Bárcena-Gama ◽  
...  
Keyword(s):  
Growth Performance ◽  
Carcass Characteristics ◽  
Ractopamine Hydrochloride
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