Effect of ractopamine hydrochloride (Optaflexx) dose on live animal performance, carcass characteristics and tenderness in early weaned beef steers

Boler, D. D.; Shreck, Adam L.; Faulkner, D. B.; Killefer, J.; McKeith, F. K.; Homm, J.W.; Scanga, J. A.

doi:10.1016/j.meatsci.2012.05.011

Cited by 58 publications

(61 citation statements)

References 10 publications

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“…This is in agreement with previous studies, which were within the range 4.0 to 5.7% for HCW and 1.8 to 2.6% for carcass dressing (Lawrence et al 2011;Parr et al 2011;McEvers et al 2014). Several studies have reported increases in hot carcass dressing in steers fed b-adrenergic agonists (Schroeder et al 2003;Avendan˜o-Reyes et al 2006;Boler et al 2012;Bohrer et al 2014). Although some studies have reported no effect of b-adrenergic agonist on carcass dressing (Winterholler et al 2007;Scramlin et al 2010), increments for at least 1.5% in carcass dressing are commonly expected when zilpaterol hydrochloride is fed to beef cattle (Schroeder et al 2003;Avendan˜o-Reyes et al 2006).…”

Section: Carcass Characteristicssupporting

confidence: 92%

Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls

Rodríguez-GaxiolaMiguel

Domínguez-VaraIgnacio

Barajas-CruzRubén

et al. 2015

Can. J. Anim. Sci.

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. 2015. Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls. Can. J. Anim. Sci. 95: 609Á615. Sixty beef bulls with a body weight (BW) of 314.79 16.2 kg were used to evaluate the effects of zilpaterol hydrochloride (ZH) and zinc methionine (ZM) on growth performance and carcass characteristics. The experimental design was a randomized complete block, with a factorial 2 )2 arrangement of treatments (ZH: 0 and 0.15 mg kg(1 BW; ZM: 0 and 80 mg kg (1 dry matter). The ZH increased (P B0.05) the final BW, average daily gain, feed conversion, carcass yield and longissimus dorsi area. Bulls fed ZH plus ZM had less (PB0.01) backfat thickness and intramuscular fat (IMF) compared with those fed ZH or ZM alone. The ZH increased (PB0.02) the meat crude protein content and cooking loss. It is therefore concluded that ZH increases growth performance, carcass yield, longissimus dorsi area, and meat crude protein. The interaction of ZM and ZH did not present additional advantages. The reason for the reduction in backfat thickness and IMF by ZH plus ZM is unclear, and implies that our knowledge of b-agonistic adrenergic substances and their interactions with minerals is incomplete. (1 BW; ZM : 0 et 80 mg kg (1 matie`res se`ches Á DM Á « dry matter »). Le ZH a augmente´(P B0,05) le BW final, le gain moyen quotidien, l'indice de consommation, le rendement de carcasse et l'aire du muscle longissimus dorsi. Les taureaux nourris de ZH et de ZM avaient une plus faible (P B0,01) e´paisseur de gras dorsal et de gras intramusculaire (IMF Á « intramuscular fat ») par rapport aux taureaux nourris de ZH seulement ou ZM seulement. Le ZH a augmente´(PB0,02) la teneur en prote´ines brutes de la viande et les pertes a`la cuisson. Par conse´quent, on peut conclure que le ZH augmente la performance de croissance, le rendement de la carcasse, l'aire du muscle longissimus dorsi et le taux de prote´ines brutes de la viande. L'interaction de ZM et de ZH ne pre´sente pas d'avantages supple´mentaires. La re´duction de e´paisseur de gras dorsal et du IMF par ZM et ZH ensemble demeure incomprise et souligne que nos connaissances des substances b-agonistes adre´nergiques et leurs interactions avec les mine´raux sont encore incomple`tes.

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Section: Carcass Characteristicssupporting

confidence: 92%

Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls

Rodríguez-GaxiolaMiguel

Domínguez-VaraIgnacio

Barajas-CruzRubén

et al. 2015

Can. J. Anim. Sci.

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“…The effects of GP on tenderness are more prominent prior to postmortem aging. This was observed by Boler et al (2012) when steaks from cattle fed RH and aged 4 d had 13% greater WBSF compared to controls; however, after 7, 14, and 21 DOA, WBSF values did not differ. Other literature indicate IMP steaks required approximately 7 DOA to be similar to CON steaks, while COMBO steaks required 21 DOA to be similar to CON steaks (Quinn et al, 2008;Schneider et al, 2007).…”

Section: Discussionmentioning

confidence: 84%

Effects of anabolic implants and ractopamine-HCl on muscle fiber morphometrics, collagen solubility, and tenderness of beef longissimus lumborum steaks1,2

Ebarb

Phelps

Drouillard

et al. 2017

Journal of Animal Science

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“…In addition, special interest groups are raising issues about the image of U.S. beef (Consumers Union, 2013). It has been documented for both ractopamine (Boler et al, 2012;Scramlin et al, 2010;Woerner et al, 2011) and zilpaterol (Avendaño-Reyes et al, 2006;Garmyn et al, 2010;Scramlin et al, 2010) that beef from cattle fed β agonists is less tender (Consumers Union, 2013). However, Scramlin et al (2010) and Boler et al (2012) both reported that the decreased tenderness associated with ractopamine could be overcome with postmortem aging for 14 and 28 d, respectively.…”

Section: Changes In the United Statesmentioning

confidence: 99%

“…For cattle and swine, 3 main feed additive products exist. The first is Optaflexx, which contains the active ingredient ractopamine hyperchloride and is used for cattle (Boler et al, 2012). The second is Paylean, which contains the active ingredient ractopamine hydrochloride and is used for swine (Apple et al, 2007;Patience et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Beta agonists in livestock feed: Status, health concerns, and international trade

Centner

Alvey

Stelzleni

2014

Journal of Animal Science

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Since the U.S. Food and Drug Administration approved ractopamine hydrochloride and zilpaterol hydrochloride in animal feeds, usage of those compounds has been a topic of worldwide debate. Ractopamine and zilpaterol are β-adrenergic agonists used as veterinary drugs to increase weight gain in certain animals raised for food. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) established maximum residue limits for ractopamine, which were adopted by the Codex Alimentarius Commission (Codex). No maximum residue limits for zilpaterol have been adopted by JECFA, and new reports of animal mobility issues confront the use of this feed additive. However, many countries disagree with the Codex standards and are restricting or banning meat products containing β agonists. The bans by major importers of U.S. meat products have prompted some to advocate that the United States use the World Trade Organization dispute settlement body. This paper looks at the developments to provide a fuller accounting of what the issues may mean to U.S. firms selling meat products containing residues of β agonists.

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Effect of ractopamine hydrochloride (Optaflexx) dose on live animal performance, carcass characteristics and tenderness in early weaned beef steers

Cited by 58 publications

References 10 publications

Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls

Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls

Effects of anabolic implants and ractopamine-HCl on muscle fiber morphometrics, collagen solubility, and tenderness of beef longissimus lumborum steaks1,2

Beta agonists in livestock feed: Status, health concerns, and international trade

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