Variation temporelle de la valeur nutritive des principals plantes spontanees broutees par le dromadaire dans le sud est Algerien

الملخص EN

Based on the study we did concerning the temporal variation of the chemical composition and assessment of the energetic value corresponding to the spontaneous principles plants grazed by the dromedary in south ester of Algeria, we could get for the chemical composition estimation, that the whole plants are relatively variables in MS, going from 20.51% for Agga to 75.76% for Tagtag, poor in MAT could not overtake 4.81 %, whilst for CB, MM and MO; the result in possession are relatively variables. The seasonal variation of the chemical composition is not very clear it is weak.The seasonal average of MS show that a rich season is the winter, with 58.96%, in comparison with autumn and spring with respectively 52.45% and 53.41%. Concerning the seasonal average of MO, we got a bring contents with 89.28% for spring, 85.7% for winter and 82.42% for autumn.

The same thing for MM, we got a contents of 17.58% for autumn, 14.31% for winter and finally 10.71% for spring.

Concerning the seasonal average of MAT, we got the highst rates for spring season with 4.22%, followed by winter season with 3.89% and 3.48% for autumn.

The seasonal variation of CB average show that spring is the richest season with 27.10%, but for autumn and spring we got a bring contents with respectivelly 23.71% and 24.71%. Concerning the energetic value, in general, the highest values of UFL and UFV are got for Zeita, Alenda and Agga with respectivelly 0.80, 0.78 and 0.75 UFL/Kg of MS and 0.77, 0.73 and 0.73 UFV/Kg of MS.

On the other hand, the weakest are those got for Tagtag and Arfege with 0.58 et 0.54 UFL/Kg of MS and 0.46 UFV/Kg of MS.

Concerning the seasonal variation, highest values of UFL and UFV are those got in spring with 0.72 UFL/Kg of MS and 0.65 UFV/Kg of MS in comparison with 0.65 and 0.63 UFL/Kg of MS and 0.59 to 0.56 UFV/Kg of MS respectively got in autumn winter.