Ractopamine levels for finishing barrows maintained in heat stress

Sanches, Josilene Figueiredo; Kiefer, Charles; Carrijo, Alfredo Sampaio; Moura, Mariana Souza de; Silva, Elizangela Alves da; Santos, Alexandre Pereira dos

doi:10.1590/s1516-35982010000700019

Cited by 6 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The literature reports a positive effect of ractopamine on carcass characteristics, particularly in decreasing back-fat thickness; this effect is explained by the ability of this compound to reduce fatty acid synthesis in adipose tissue and to increase protein synthesis in muscle tissue (SANCHES et al, 2010). In the present study, however, ractopamine levels had no effect on back-fat thickness, corroborating results obtained by HINSON et al (2011).…”

Section: ------------------------------------------------------------supporting

confidence: 91%

Net energy and ractopamine levels for barrows weighing 70 to 100kg

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

Section: ------------------------------------------------------------supporting

confidence: 91%

Net energy and ractopamine levels for barrows weighing 70 to 100kg

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

Empirical models to predict feed intake of growing-finishing pigs reared under high environmental temperatures

Perondi

Kipper

Andretta

et al. 2018

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

Several empirical models were proposed to predict feed intake (FI) of growingfinishing pigs reared under high environmental temperatures. However, these models have not been evaluated under conditions different from those in which they were developed. Twelve empirical models were evaluated using a database built after systematic literature review (observed data: 28 studies in which the FI was evaluated in pigs under high environmental temperatures). Model accuracy was assessed using the mean squared of prediction error (MSPE). Analyses were performed considering two scenarios: (1) general population, where all observed data were used in the simulation; (2) reference population, where data were filtered in order to simulate only scenarios with environment (temperature range) and animals (body weight and sex) similar to that used in the model development. Six models estimated FI values similar (p > 0.05) to those observed in the general population, while four models produced estimates similar to the observed values in the reference populations. Most models were more accurate when they were simulated using the reference population than when the simulation considered the general database. Moving the simulation from the general database to the reference population reduced up to 98 % of the MSPE, depending on the equation. Empirical models allow to accurately predict FI of growing-finishing pigs exposed to high environmental temperatures, especially in scenarios similar to the ones used for model development. Thus, population characteristics (body weight and sex) and environment (temperature range) must be considered in the model assessment.

show abstract

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

View full text Add to dashboard Cite

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.

show abstract

Ractopamine levels for finishing barrows maintained in heat stress

Cited by 6 publications

References 20 publications

Net energy and ractopamine levels for barrows weighing 70 to 100kg

Net energy and ractopamine levels for barrows weighing 70 to 100kg

Empirical models to predict feed intake of growing-finishing pigs reared under high environmental temperatures

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

Contact Info

Product

Resources

About