The use of diets with increased fibre content from alternative feedstuffs less digestible for pigs is a solution considered to limit the impact of increased feed costs on pig production. This study aimed at determining the impact of an alternative diet on genetic parameters for growth, feed efficiency, carcass composition and meat quality traits. A total of 783 Large White pigs were fed a high-fibre (HF) diet and 880 of their sibs were fed a conventional (CO) cereal-based diet. Individual daily feed intake, average daily gain, feed conversion ratio and residual feed intake were recorded as well as lean meat percentage (LMP), carcass yield (CY) and meat quality traits. Pigs fed the CO diet had better performances for growth and feed efficiency than pigs fed the HF diet. They also had lower LMP and higher CY. In addition, pigs fed the CO diet had lower loin percentage and ham percentage and higher backfat percentage. No differences were observed in meat quality traits between diets, except for a* and b* values. For all traits, the genetic variances and heritability were not different between diets. Genetic correlations for traits between diets ranged between 0.80 ± 0.13 and 0.99 ± not estimable, and none were significantly different from 0.99, except for LMP. Thus, traits in both diets were considered as mainly affected by similar sets of genes in the two diets. A genetic correlation lower than 0.80 would justify redesigning the breeding scheme; however, some genetic correlations did not differ significantly from 0.80 either. Therefore, larger populations are needed for a more definitive answer regarding the design of the breeding scheme. To further evaluate selection strategies, a production index was computed within diets for the 29 sires with estimated breeding value reliability higher than 0.35. The rank correlation between indices estimated in the CO and in the HF diet was 0.72. Altogether, we concluded that limited interaction between feed and genetics could be evidenced, and based on these results there is no need to change pig selection schemes to adapt to the future increased use of alternative feedstuffs in production farms.

使用替代饲料中纤维含量增加的日粮对猪来说不易消化，这是一种可以限制饲料成本增加对猪产量的影响的解决方案。这项研究旨在确定替代饮食对遗传参数的影响，包括生长，饲料效率，car体组成和肉质性状。共有783头大白猪饲喂高纤维（HF）日粮，其中880头同胞饲喂了常规的（CO）谷类饮食。记录个体每日饲料摄入量，平均日增重，饲料转化率和残余饲料摄入量以及瘦肉率（LMP），car体产量（CY））和肉质特征。饲喂一氧化碳日粮的猪比饲喂HF的猪具有更好的生长和饲料效率。他们还具有较低的LMP和较高的CY。另外，饲喂一氧化碳的猪的腰肉和火腿的百分比较低，而背脂的百分比较高。在饮食之间的肉质性状没有观察到差异，除了一个*和b*值。对于所有性状，饮食之间的遗传差异和遗传力没有差异。饮食之间性状的遗传相关性介于0.80±0.13和0.99±之间，无法估计，除LMP外，其他均与0.99无显着差异。因此，两种饮食中的性状被认为主要受两种饮食中相似基因集的影响。低于0.80的遗传相关性将证明重新设计育种方案是正确的；但是，某些遗传相关性也与0.80并无显着差异。因此，需要更多的种群以获得关于育种方案设计的更明确的答案。为了进一步评估选择策略，计算了29头公母的日粮中的生产指数，估计的育种值可靠性高于0.35。在CO和HF饮食中估计的指数之间的等级相关性是0.72。综上所述，我们得出的结论是，可以证明饲料与遗传学之间的相互作用有限，并且基于这些结果，无需更改猪的选择方案，以适应将来在生产农场中使用替代饲料的更多使用。