Phytosociological Surveys and Monitoring of the Bromatological Parameters According to the Age of Regrowth of Savannah Pastures Perfectly Reconstituted in the Central Zone of Côte d'Ivoire

Abstract

Although pastures in central (Affouvansou) Côte d'Ivoire are abundant, signs of undernutrition are observed in the animals towards the end of wintering, possibly due to insufficient quality pastures, poor grass quality, or poor herd distribution. Using the in-vivo digestibility method, bromatological monitoring of the fodder from these pastures was carried out according to the development age of the regrowth using Djallonke sheep. The objective is to help in the judicious use of these pastures. At regrowth age intervals between the 4th and 8th week, the nitrogen content in the grass decreases, the energy value increases at 6 weeks, and decreases slightly to remain at a correct value in the following weeks. Due to its nitrogen value, this pasture can be classified as a more or less poor quality savannah fodder. However, the savannah studied is of excellent quality from an energy point of view at 5 - 6 weeks of regrowth age. Depending on the nitrogen value, the forage can be said to be of average quality from the 5th to the 7th week. Beyond 8 weeks, the forage is of poor quality. The nitrogen content is therefore a limiting factor here. It cannot meet the maintenance needs of the UBT. It, makes sense to use the pastures in the center of the country between the 6th and 7th week of regrowth to get the most out of it.