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Articles by Amor Gaddour
Total Records ( 6 ) for Amor Gaddour
  Amor Gaddour , Sghaier Najari and Mabrouk Ouni
  A data issued from 16 years performances schedule of local goat, Alpine, Damascus, Murciana and crossed groups was used to study the genotypes productive behaviour under Tunisian oases conditions. The aim is to evaluate the possibilities of local goat productivity improvement by cross breeding in intensive mode and also, to choose the better improving breed and the cross level. About 1923 individual goat milking data was used to evaluate the dairy potentialities of local goat, imported breeds and crossed genotypes. A statistical analysis was applied on estimated dairy performances such as, daily milk average, total production by lactation and milking period. The cross breeding with imported breeds improves the dairy performances since the first generation. The crossing between these goats races appreciably improves the dairy performance of the local goat and this, as of the first generation. The dairy production with this generation is, about 248 kg for the Alpine one, of 181 kg for Damascus and 190 kg for Murciana, is only 137 kg by lactation for the local breed.
  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.
  Amor Gaddour , Sghaier Najari and Mabrouk Ouni
  A data issued from 16 years performances schedule of local goat, Alpine, Damascus, Murciana and crossed groups was used to study the genotypes productive behaviour under Tunisian oases conditions. The aim is to evaluate the possibilities of local goat productivity improvement by cross breeding in intensive mode and also, to choose the better improving breed and the propice crossing level. So, data of periodic individual weighing was used to estimates kidís weight at some standard ages of studied genetic goats groups. Statistical analysis of about 11500 kidís weights shows that, the cross breeding allows to improve the growth performances since the first generation with respect to local population production. ANOVA test shows an important effect of genotypes and environment upon kids weights (p< 0.01). The kidís weight averages at birth and at 120 days age were about 3.49 and 15.78 kg, respectively. The cross breeding second generation allows the better improvement of local goat potentialities kidís weight at 120 days reaches 16.19 kg for Damascus x local genotype. All imported breeds registered low performances than those known in their original regions.
  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.
  Amor Gaddour , Sghaier Najari and Mabrouk Ouni
  Dairy data harvested during 16 years in a goat herd composed by local goat, Alpine, Damascus, Murciana and 6 crossed groups was used in the present study. The aim is to establish the effects of genotype-environment interaction upon goat milking potentialities under oasian husbandry conditions. For each goat, total production per lactation (Kg), daily average (kg day 1) and milking period (days) were estimated by Fleischmann method. A GLM Procedure was applied to identify the interactive effects of genotype towards the year and the kidding mode, respectively. Analysis show the milk production per lactation varies differently both with genetic groups and the year of kidding. Among pure breeds the productive behaviour for each group depends largely to the year. For example, the Alpine production varied between 329 kg during 179 days and decreased to 217 kg during the year 1990/1991. The kidding mode effect seems not similar for all genetic groups, especially among crossed genotypes. Results allow to conclude that the oasian environment modulate largely the dairy potentialities of caprine genetic groups. Some genotypes have more regular performances than other subjected to the same conditions. Such interactive effect should be considered to organise genetic improvement program.
  Amor Gaddour and Sghaier Najari
  The local goat, Alpine, Damascus, Murciana and crossed groups was used to study the genotypes productive behaviour under Tunisian oases conditions. The aim is to evaluate the possibilities of local goat productivity improvement by cross breeding in intensive mode and also, to choose the better improving breed and the propice crossing level. The dairy production with this generation is, about 248 kg for the Alpine one, of 181 kg for Damascus and 190 kg for Murciana, is only 137 kg by lactation for the local breed.
 
 
 
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