Effect of level of nitrogen fertilization of Kentucky 31 tall fescue (Festuca arundinacea Schreb.) on brood-cow health
Stuedemann, J.A.; Wilkinson, S.R.; Ciordia, H.; Caudle, A.B.
Proceedings of XIV International Grassland Congress, held at Lexington, Kentucky, USA, June 15-24, 1981 Smith, JA; Hays, VW Editors: 728-732
Pastures of tall fescue Kentucky 31 were fertilized at 3 N levels high (667 and 0 kg N/ha yr from broiler litter in 1968-74 and 1975-77, resp.), moderate (134 and 224 kg N/ha yr from ammonium nitrate in 1969 and 1970-77, resp.) and low (84 and 74 kg N/ha yr in 1972 and 1973-77, resp.), and grazed by cows on a yr-round basis. Within yr, cattle and pastures were managed similarly. The overall mean available forage was 0.69, 1.29 and 2.17 t/ha in 1973-6 on the low-, moderate-, and high-N pastures, resp. Mineral analyses of forage indicated a potential tetany hazard on all 3 pastures, yet during 1970-7, 14, 9 and 0 cases of tetany occurred on high-, moderate-, and low-N pastures, resp.