Available phosphorus in diets with or without ractopamine for late finishing gilts

Campos, Prímula Viana; Silva, Francisco Carlos de Oliveira; Ferreira, Aloízio Soares; Oliveira, Rita Flávia Miranda de; Donzele, Juarez Lopes; Júnior, Celso José Girotto; Pereira, Cinthia Maria Carlos; Saraiva, Alysson

doi:10.1590/s1516-35982012000300023

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…These authors recommended that RAC diets should be supplemented with additional available phosphorus to maintain the same bone mineral content as control pigs. Contrary to these results, Campos et al (2012) fed 4 different levels of available phosphorus to control and RAC pigs, and concluded that feeding RAC at 5 mg/kg for 34 d did not affect bone strength or the percentage of bone phosphorus, calcium, or ash. Pardo et al (2004) evaluated the effects of phytase and inorganic phosphate in pigs fed 0 or 10 mg/kg of RAC for 28 d and reported that RAC did not adversely affect bone traits compared to control pigs.…”

Section: Resultsmentioning

confidence: 66%

Review: Effects of Ractopamine Hydrochloride (Paylean) on welfare indicators for market weight pigs1

Ritter

Johnson

Benjamin

et al. 2017

Translational Animal Science

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This review summarizes the effects of ractopamine hydrochloride (RAC) dose (5, 7.5, 10, and 20 mg/kg) on market weight pig welfare indicators. Ractopamine hydrochloride (trade name Paylean) is a β-adrenergic agonist that was initially approved in the U.S. in 1999 at doses of 5 to 20 mg/kg to improve feed efficiency and carcass leanness. However, anecdotal reports suggested that RAC increased the rate of non-ambulatory (fatigued and injured) pigs at U.S. packing plants. This led to the addition of a caution statement to the Paylean label, and a series of research studies investigating the effects of RAC on pig welfare. Early research indicated that: (1) regardless of RAC administration, fatigued (non-ambulatory, non-injured) pigs are in a state of metabolic acidosis; (2) aggressive handling increases stress responsiveness at 20 mg/kg RAC, while 5 mg/kg reduces stress responsiveness to aggressive handling. Given this information, dosage range for Paylean was changed in 2006 to 5 to 10 mg/kg in market weight pigs. Subsequent research on RAC demonstrated that: (1) RAC has minimal effects on mortality, lameness, and home pen behavior; (2) RAC fed pigs demonstrated inconsistent prevalence and intensity of aggressive behaviors; (3) RAC fed pigs may be more difficult to handle at doses above 5 mg/kg; and (4) RAC fed pigs may have increased stress responsiveness and higher rates of non-ambulatory pigs when subjected to aggressive handling, especially when 20 mg/kg of RAC is fed.

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Section: Resultsmentioning

confidence: 66%

Review: Effects of Ractopamine Hydrochloride (Paylean) on welfare indicators for market weight pigs1

Ritter

Johnson

Benjamin

et al. 2017

Translational Animal Science

View full text Add to dashboard Cite

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A multivariate approach to determine the factors affecting response level of growth, carcass, and meat quality traits in finishing pigs fed ractopamine1

Pompeu¹,

Rodrigues²,

Cavalcanti³

et al. 2017

Journal of Animal Science

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The effect of ractopamine (RAC) supplementation on growth, carcass, and meat quality traits of finishing pigs was studied using a meta-analytical approach. The database was composed of 57 studies published from 2004 to 2016. The dependent variables extracted for the meta-analysis included final BW, ADG, ADFI, feed:gain ratio, HCW, dressing percentage, carcass length, lean yield, back fat thickness, loin muscle area, loin depth, postmortem pH, meat brightness, redness, and yellowness. The studies were grouped by similarity in 3 clusters (C1, C2, and C3) by hierarchical clustering on principle components. The main differences observed between clusters were those of animal initial weight, which increased from C1 through C3. Linear mixed models were used to analyze the data, where studies were assumed as random effect, whereas the total amount of RAC in the diet, cluster, and sex category were considered fixed effects. The interactions between cluster and sex category (barrows, gilts, and mixed sex) and RAC level were also evaluated. Dietary RAC was effective in improving final weight ( < 0.0001), ADG ( < 0.0001), and feed:gain ratio ( < 0.0001) and had a positive effect on HCW ( < 0.0001), lean yield ( = 0.0081), loin muscle area ( = 0.0190), and loin depth ( < 0.0001). In addition, a relatively limited effect on pork quality was observed in the current study. The RAC supplementation was more effective, mainly when pigs started supplementation with higher initial weight, although different responses were observed according to sex category ( < 0.05). There is ample indication that growth and carcass traits could be improved by dietary RAC supplementation. Ractopamine supplementation did not influence the pork quality.

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Available phosphorus in diets with or without ractopamine for late finishing gilts

Cited by 2 publications

References 11 publications

Review: Effects of Ractopamine Hydrochloride (Paylean) on welfare indicators for market weight pigs1

Review: Effects of Ractopamine Hydrochloride (Paylean) on welfare indicators for market weight pigs1

A multivariate approach to determine the factors affecting response level of growth, carcass, and meat quality traits in finishing pigs fed ractopamine1

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