The effects of a step-up ractopamine feeding program on growth performance and low-sodium ham characteristics of purebred Berkshire pigs1

Bohrer, Benjamin M.; Kyle, J. M.; Little, K.L.; Zerby, H. N.; Boler, D. D.

doi:10.2527/jas.2013-6854

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…In agreement, Carr et al (2005) found that RAC did not affect all s.c. backfat measures and Main et al (2009) reported that 10 mg/kg RAC did not affect loin depth. Apple et al (2008) reported that RAC increased marbling, whereas other studies demonstrate RAC does not affect marbling (Crome et al, 1996;Carr et al, 2005;Bohrer et al, 2013); however, Armstrong et al (2004) found that RAC decreased the amount of Table 3. Performance test and blood parameters of barrows fed a conventional swine finishing diet containing 0 mg/kg ractopamine HCl (CON) or a diet formulated to meet the requirements of finishing barrows fed 10 mg/kg RAC 1 (RAC+) for 32 d marbling.…”

Section: Growth Performance and Carcass Characteristicsmentioning

confidence: 96%

Use of electromyography to detect muscle exhaustion in finishing barrows fed ractopamine HCl1

Noel¹,

Broxterman

McCoy³

et al. 2016

Journal of Animal Science

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Section: Growth Performance and Carcass Characteristicsmentioning

confidence: 96%

Use of electromyography to detect muscle exhaustion in finishing barrows fed ractopamine HCl1

Noel¹,

Broxterman

McCoy³

et al. 2016

Journal of Animal Science

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“…Proximate composition was determined by taking the first 2 slices in each of the zones A, B, C, D, and E described above and homogenized in a Cuisinart food processor (CUI DFP-7BC; Cuisinart, East Windsor, NJ). Moisture and fat percentage were determined using the same procedure as outlined in Bohrer et al (2013b). Briefly, a 7-g sample of the homogenate was oven-dried in duplicate at 100°C for at least 24 h to determine percentage moisture.…”

Section: Proximate Compositionmentioning

confidence: 99%

Effects of immunological castration (Improvest) on further processed belly characteristics and commercial bacon slicing yields of finishing pigs

Kyle

Bohrer

Schroeder

et al. 2014

Journal of Animal Science

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Objectives were to compare fresh belly characteristics, further processed belly characteristics, and commercial bacon slicing yields of immunologically castrated (IC) barrows, IC barrows fed ractopamine hydrochloride (IC+RAC), physically castrated (PC) barrows, intact males, and gilts. One hundred eighty-eight bellies from pigs housed in single sex pens (n = 48) slaughtered at 130 kg ending live weight were evaluated for flop distance, length, width, thickness, and fatty acid composition. Bellies were injected, thermally processed, and sliced according to standard protocols at a USDA federally inspected facility. Complete slices were sorted by trained plant personnel. Then, sliced bellies were individually packaged to maintain anatomical orientation. The effects of treatments were analyzed as a generalized linear mixed model with pen of pigs serving as the experimental unit for all comparisons. Belly thickness was not different (P ≥ 0.11) in bellies from IC barrows (3.74 cm) compared with bellies from IC+RAC (3.60 cm), PC barrows (3.94 cm), or gilts (3.64 cm); however, bellies were 0.42 cm thicker (P < 0.01) in IC barrows compared with intact males. Iodine value was not different (P ≥ 0.06) in bellies from IC barrows (68.26) compared with bellies from IC+RAC (69.78), PC barrows (67.55), or gilts (69.45); however, iodine value was 2.32 units less (P < 0.01) in IC barrows compared with intact males. Green weight was not different (P ≥ 0.09) in bellies from IC barrows (4.88 kg) compared with bellies from IC+RAC (5.11 kg), PC barrows (5.10 kg), or gilts (4.79 kg); however, green weight was 0.56 kg greater (P < 0.0001) in IC barrows compared with intact males. Pump uptake and cooked yield was not different (P ≥ 0.15) among treatment groups. Slicing yield (as a percentage of green weight) was decreased (P ≤ 0.01) in bellies from IC barrows (93.61%) compared with bellies from PC barrows (98.42%) or gilts (98.19%); however, slicing yield was not different (P ≥ 0.11) among bellies from IC barrows, IC+RAC, or intact males. Overall, fresh belly characteristics of IC barrows were analogous to PC barrows and gilts, but commercial slicing yields of bacon manufactured from IC barrows were less than both PC barrows and gilts.

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“…The increased muscle growth due to ractopamine could possibly demand increased levels of plasma membrane repair proteins to maintain homeostasis. Therefore, the over-abundance of tripartite motifcontaining protein 72 in RAC could be attributed to the increased muscle mass accretion in ractopamine-fed animals (Bohrer et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…Purebred Berkshire pigs were used in this study because they are often used in branded pork programs (McMullen, 2006). Two-hundred purebred Berkshire pigs (barrows and gilts; average initial bodyweight of 68.9 kg) were used as previously described (Bohrer et al, 2013). All animals were raised under similar conditions at The Ohio State University Western Agricultural Research Station (South Charleston, OH, USA).…”

Section: Methodsmentioning

confidence: 99%

Ractopamine-induced changes in sarcoplasmic proteome profile of post-rigor pork <i>semimembranosus</i> muscle

Wu¹,

Nair²,

Suman³

et al. 2017

SA J. An. Sci.

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Ractopamine is a beta-adrenergic agonist that increases leanness and carcass weight in finishing pigs. Our previous study observed that dietary ractopamine increased the abundance of several glycolytic enzymes in the sarcoplasmic proteome of post-rigor pork longissimus thoracis muscle. Pork semimembranosus is an economically important muscle and demonstrates differences in biochemistry compared with longissimus thoracis. Nonetheless, the effects of ractopamine on sarcoplasmic proteome of semimembranosus have not been evaluated yet. Therefore, this study examined the influence of ractopamine on sarcoplasmic proteome of post-rigor pork semimembranosus. Analyses of sarcoplasmic proteome of semimembranosus muscles from control (CON; diet without ractopamine) and ractopamine-fed (RAC; 7.4 mg/kg for 14 days followed by 10.0 mg/kg for 14 days) barrows revealed that haemoglobin subunit beta, alpha-crystallin B, and titin fragments were over-abundant in CON. In contrast, myosin light chain 1/3 and tripartite motif-containing protein 72 were over-abundant in RAC. The low abundance of haemoglobin subunit beta and alpha crystallin B in RAC could be attributed to fibre type shift (from oxidative to glycolytic) in response to ractopamine. The over-abundance of MLC 1/3 and tripartite motif-containing protein 72 in RAC could be due to the increased myofibrillar protein synthesis and muscle mass in ractopamine-fed pigs. Dietary ractopamine decreased the abundance of sarcoplasmic proteins involved in oxygen transport and chaperone activity, but increased the abundance of proteins involved in muscle contraction and plasma membrane repair in pork semimembranosus muscle. ________________________________________________________________________________________________

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The effects of a step-up ractopamine feeding program on growth performance and low-sodium ham characteristics of purebred Berkshire pigs1

Cited by 10 publications

References 19 publications

Use of electromyography to detect muscle exhaustion in finishing barrows fed ractopamine HCl1

Use of electromyography to detect muscle exhaustion in finishing barrows fed ractopamine HCl1

Effects of immunological castration (Improvest) on further processed belly characteristics and commercial bacon slicing yields of finishing pigs

Ractopamine-induced changes in sarcoplasmic proteome profile of post-rigor pork <i>semimembranosus</i> muscle

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