Genetic parameters of backfat thickness, age at 100 kg and ultimate pH in on-farm tested French Landrace and Large White pigs

Selection for reduced muscle glycolytic potential in Large White pigs. II. Correlated responses in meat quality and muscle compositional traits

“…Our heritability estimates differed from previous values reported by Bidanel et al. [4] in a French Large White population for ultimate pH of adductor femoris, semimembranosus and semispinalis capitis muscles (0.22, 0.17 and 0.22, respectively). These authors found no muscle difference for heritability of pH 24 h whereas, in the present study, the adductor femoris muscle had a clearly higher heritability value than the semispinalis capitis muscle, the semimembranosus being intermediate.…”

Genetic parameters of production and reproduetive traits in on a farm tested Danish Large White and Landrace swine in Greece

“…Landrace pigs grew faster, were fatter and showed smaller muscle depths than LW. The result about the age is not in agreement with other literature references where LW are generally reported to grow faster than Landrace pigs (GU et al, 1989, FERRAZ andJOHNSON, 1993;BIDANEL et al, 1994;DUCOS and BIDANEL, 1996). Furthermore, LD pigs are reported to be leaner (GU et al, 1989) or fatter at standardized liveweight (FERRAZ and JOHNSON, 1993;BIDANEL and DUCOS, 1996;DUCOS and BIDANEL, 1996) as in the present study.…”

“…The highest values were obtained between age and BT in LW (-0 44) and between . Negative genetic correlations between age and BT are reported widely in the literature in the magnitude of-0.05 to -0.54 in both breeds (JEFFRIES and PETERSON, 1982;KENNEDY et al, 1985;SAVOIE and MINVIELLE, 1988;KAPLON et al, 1991;HOFER et al" 1992;LO et al 1992-BIDANEL et al, 1994LI and KENNEDY, 1994). Negative genetic correlations between BT and MD are found also by LO et al (1992).…”

“…HOVENIER et al (1992) reported favorable genetic correlations between liveweight gain and meat quality traits and unfavorable genetic correlations between meat quality traits and backfat thickness and lean meat content. Slightly unfavorable genetic correlations between pH and age or between pH and BT are also reported in the literature (JOHANSSON, 1987;BIDANEL et al, 1994). Furthermore, CAMERON (1990) and LO et al (1992) have found unfavorable genetic correlations between muscle depth and (or) backfat thickness with intramuscular fat content and water holding capacity.…”

“…Reported heritabilities for these traits are in the ränge of 0.21 to 0.59 for LD and 0.21 to 0.53 for LW SAVOIE and MTNVIELLE, 1988;GU et al, 1989;KAPLON et al, 1991;HOVENIER et al, 1992;LO et al, 1992;BRYNER et al, 1992;BIDANEL et al, 1994;LI and KENNEDY, 1994;DUCOS and BIDANEL, 1996;BRANDT and TAEUBERT, 1998). Selection on production traits has proved to be efficient in both breeds.…”