118 Nutrient Cycling Potential from Manure from Heifers Fed Four Bermudagrass Cultivars

Abstract Maintenance of pastures for grazing accounts $132.50/animal in the United States (23% operating costs), and pasture nutrient input represents single greatest influence productivity per unit area. Cultivar differences forage offered to cattle have potential manifest digestive efficiency, resulting different excretion profiles. The objective this study was assess growth incorporation N, P, K into material from manure fed one four bermudagrass (Cynodon dactylon [L.] Pers.) cultivars. Ruminally fistulated heifers (n = 4) were assigned randomly cultivars (Coastal, Russell, Tifton 44, or 85) 30-d vivo periods (21-d adaptation 9-d collection). On d 23, total fecal collections subsampled each heifer. As a hierarchical addition, controlled greenhouse experiment conducted period [15 pots period; 5 treatments (four diets plus negative control) × 3 replications]. Manure added 4.58 L based on stocking rate estimates Central Alabama (1,110 kg/ha). seeded with (cv. Giant) as an indicator uptake. At harvest (d 70), herbage, root, soil samples collected. Herbage root assayed CP. Soil pH, K, Mg, Ca. Data analyzed using SAS v. 9.4. There no effect treatment herbage (P 0.88) DM yield =.00;.54 and.73 g/pot, respectively). Similarly, there pH 0.18; 5.5), P 0.78; 24.2 kg/ha), 0.42;56.7 Results are interpreted mean that, regardless cultivar effects ruminal dynamics, is little subsequent production