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Accueil du site → Doctorat → États-Unis → 1988 → Pattern of utilization and response of Lehmann lovegrass (Eragrostis lehmanniana Nees) grazed by cattle

University of Arizona (1988)

Pattern of utilization and response of Lehmann lovegrass (Eragrostis lehmanniana Nees) grazed by cattle

Santos do Nascimento, Hoston Tomas

Titre : Pattern of utilization and response of Lehmann lovegrass (Eragrostis lehmanniana Nees) grazed by cattle.

Auteur : Santos do Nascimento, Hoston Tomas.

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1988

Résumé
A fifteen month experiment was conducted to study the pattern of utilization of Lehmann lovegrass by cows during different seasons at three stocking rates on four patch types (grazed, open ; grazed, under-mesquite ; mowed, artificial ; and ungrazed control) at the Santa Rita Experimental Range. The purpose of the research was to determine the influence of standing biomass, proportion of green material and nutrient content of patch types on the relative time cattle grazed patch types. Cattle biting rate on patch types was also measured. Height of leaves and flowers, dry biomass (kg/ha and %), green biomass (kg/ha) and total biomass were greater on ungrazed patches. Proportion of green was greater in grazed than ungrazed patches. Protein, phosphorus, Calcium and IVDMD were higher in green and complete samples of grazed than ungrazed patches. Cattle concentrated grazing upon upland, open grazed patches and under-mesquite canopy. These selected areas were higher in proportion of green biomass and nutrient value and lower in total standing crop and total green biomass than ungrazed areas. Nutrient density, rather than biomass appeared to govern cattle grazing.

Mots clés : Love grass. ; Cattle — Arizona — Santa Rita Experimental Range. ; Grazing — Arizona — Santa Rita Experimental Range. ; Santa Rita Experimental Range (Ariz.)

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