Prediction of carcass lean content by real-time ultrasound in Pietrain and negative stress Pietrain

Abstract

lean proportion was higher in homozygote TT than homozygote CC and heterozygote CT individuals ( P < 0·05). Gilts had more lean meat than barrows ( P < 0·05). The correlation between the lean meat proportion and ultrasound backfat thickness (UBFT) or ultrasound longissimus muscle depth (ULMD) respectively was moderate.The prediction of lean meat proportion using UBFT, ULMD and ULMA gave an R 2 which varied from 0·35 to 0·79. Real-time ultrasound is a tool that could potentially be used to predict the composition of pig carcasses before slaughter particularly if measurements can be taken with a higher degree of accuracy than at present.

Reproductive and productive performances of the stress-negative Piétrain pigs in the tropics: the case of Vietnam

“…BW7.5, AGD7.5, BF7.5 and LD7.5 of CC pigs were higher than these of CT pigs while LM7.5 was similar. This result was consistent with reports of many authors (Sanchez et al 2003;Merour et al 2009) whereas others (Youssao et al 2002a;Luc et al 2008) concluded that the halothane genotype does not affect growth performance. BF5.5 and LD5.5 of females were higher than those of males.…”

“…This was the main reason explaining why LM7.5 of males was higher than that of females. The study of Youssao et al (2002a) in Belgium, and Luc et al (2008) in Vietnam also confirmed that females had more fat than males.…”

“…The absence, or at least reduced allele frequency of the stress allele T at the halothane locus in the Piétrain-resistant pigs has been found to be the basis of an increased growth rate, a higher degree of fatness, superior meat quality, higher intramuscular fat content and lower lean meat content (Biedermann et al 2000;Merour et al 2009). However, others studies showed that the growth rate was not different between allele T carriers (heterozygous individuals) and homozygote-negative pigs (Leach et al 1996;Youssao et al 2002a). The growth rate has been shown to be affected by sex and the gilts had more lean meat than barrows (Youssao et al 2002a).…”

“…However, others studies showed that the growth rate was not different between allele T carriers (heterozygous individuals) and homozygote-negative pigs (Leach et al 1996;Youssao et al 2002a). The growth rate has been shown to be affected by sex and the gilts had more lean meat than barrows (Youssao et al 2002a).…”

“…The semen quality is affected by the season (Wysokinska et al 2009), the age of the boars (Smital 2009), the frequency of collection (Miclea et al 2008) and the boar halothane genotype (Kmiec et al 2004). While the production performances of the pure Piétrain pig breed have been reported in a previous study (Merour et al 2009), the carcass composition of stress-negative Piétrain pigs in Belgium has been studied by Youssao et al (2002a). The absence, or at least reduced allele frequency of the stress allele T at the halothane locus in the Piétrain-resistant pigs has been found to be the basis of an increased growth rate, a higher degree of fatness, superior meat quality, higher intramuscular fat content and lower lean meat content (Biedermann et al 2000;Merour et al 2009).…”