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Articles by Mouldi Abdennebi
Total Records ( 2 ) for Mouldi Abdennebi
  Sghaier Najari , Amor Gaddour and Mouldi Abdennebi
  Data carried out from 10 local goat herds’ survey was analyzed to establish the impact of the management mode upon local goat performances in the aim to identify the possibilities to improve goat milk and meat production via the flock management handling. A total of 8257 kids’ weights and 3461 dairy performances were elaborated and statistically analyzed meaning a comparison of the performances registered on pastoral breeding toward those realized in oases under intensive feeding modes. On rangelands in extensive husbandry, the local population registered low performances similar to those known for indigenous caprine breeds of marginal zones. The average kid's weight was 5.1 kg at 1 month age and the average daily milk was reduced to 0.7 kg day-1. Oasian intensive conditions improve the kids’ growth performance both on weights average and their respective variation magnitude. The kid's birth weight increased with about 21% but the oasien kids’ superiority seems progressively elapsed with the age to be only 2% at 4 months age. However, lactation performances remain low and similar even though under intensive feeding mode and indigenous goat seems genetically unable to produce more milk under favourable conditions. Thus, the genetic evolution promoted growth performances as a biological priority to produce caprine meat which remains the principal herd output. Whereas, dairy performances needing high nutritive requirements was seriously reduced by the natural selective process.
  Sghaier Najari , Amor Gaddour , Mouldi Abdennebi and Mabrouk Ouni
  About 5000 kid’s weights registered during four years in 9 herds raised in the Tunisian arid area were used in the aim to identify some genetic specificities of the local population productive behaviour towards harsh conditions. The analysis of kid’s growth under arid regions conditions shows a particular aspect of the genotypes expression in arid environment. The nature of the non-genetic factor effects on kid’s phenotypes distribution and parameters reveals a direct impact on the application of quantitative genetic methodologies for animal improvement. The expression of the "best" genetic potentialities seams to be limited by a maximum level defined by environmental factors. The normal distribution of kidís performances is not verified, especially in dry years, where the right tail of the bell curve disappeared. The statistical importance of certain parameters such as the means and the variance is modified. The construction of the mixed model could, in this special case, induce a bias or increase the variance of the prediction error. These considerations impose a revision of hypotheses and methodologies of the quantitative genetics for the livestock improvement in arid regions.
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