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The present investigation primarily deals with the inheritance of a pigmeat quality trait, the Napole technological yield (RTN), a measure of cooked weight to fresh weight. This trait as well as lean percentage at 100 kg liveweight and fattening length from 20 to 100 kg liveweight were recorded on 3459 offspring from 67 sires and 433 dams, and 3052 offspring from 64 sires and 405 dams in Penshire (P66) and Pen Ar Lan (P77) composite lines respectively. The hypothesis of a major 2-allele locus contributing to RTN was tested by use of a segregation analysis method. Highly significant likelihood ratios (mixed vs. polygenic transmission models) lead us to conclude that a major gene RN− exerting an unfavourable effect on RTN is segregating in both lines. Maximum likelihood estimates of the parameters under the hypothesis of mixed (monogenic + polygenic) inheritance show that the difference between the means of the 2 homozygotes amounts to about 3 phenotypic standard deviations of the trait, whereas the complete dominance of RN− cannot be rejected. The frequency of RN− is about 0·6 in both lines. These results are discussed in connection with the previously reported ‘Hampshire effect’ on pigmeat quality, as the Hampshire breed is a common component of the foundation stock of the 2 composite lines under study.
Industrial trials were carried out at the ArcelorMittal Isbergues
slab continuous caster with the HJN (Hollow Jet Nozzle)
previously developed at CRM at the pilot stage. This nozzle
allows the addition of fine metallic powders in molten steel
right before its solidification. These tests showed the possibility to
implement the nozzle in an industrial stainless steel slab caster.
It was observed a full melting of the injected elements (Fe and Fe-Ti),
a homogeneous distribution of titanium element in slabs and a drastic
improvement of the addition yield of titanium.
The feed head continuous casting technology was jointly developed by CRM and Irsid for the long
products. Since 1996, CRM has undertaken developments aiming at transferring the technology to
flat products. Casting trials were performed on the simulator of CRM equipped with a slab mould. The
results obtained, concerning as well the technological aspects as the product quality, are very