18 research outputs found
Evaluation of Beef Cattle Range Supplements Containing Urea and Biuret
Two winter trials were conducted with 304 lactating range cows on dry grass to evaluate non-protein-nitrogen (NPN) in 30% protein supplements containing biuret (pure and feed grade), urea and extruded grain-urea. The NPN sources contributed one-half of the supplemental nitrogen with natural 15 and 30% protein supplements serving as negative and positive controls. Winter weight loss of cows was greater (P~.02) on the negative than on the positive control in both trials. The apparent utilization of all NPN sources was low and the utilization of urea and extruded grain-urea was less than pure or feed grade biuret. Rumen biuretolytic activity was apparent within 6 days and reached and maintained a high level of activity 20 days after the initiation of feeding biuret, even with intermittent supplementation. Apparent value of NPN supplements was slightly improved with 40% dehydrated alfalfa but not with methionine- hydroxy-analogue (MHA). Palatability of supplements was lowered by urea and especially by MHA and extruded grain-urea. In a third trial with yearling heifers fed prairie hay, gains were similar on natural protein and supplements containing urea or extruded grain-urea to provide one-half of the nitrogen. When the heifers were fed the same supplements but low quality winter harvested range grass, NPN utilization appeared to be low
Estimates of direct, maternal and grandmaternal genetic effects for growth traits in Gobra cattle
Eficiência biológica de vacas de dois grupos genéticos amamentando bezerros puros ou F1, mantidas em diferentes condições de alimentação
Características da lactação de vacas Hereford criadas em um sistema de produção extensivo na região da campanha do Rio Grande do Sul
Performance of Three Warm‐season Perennial Grasses and a Native Range Mixture as Influenced by N and P Fertilization 1
Oklahoma Agricultural Experiment Station, Bulletin no. 470, June 1956: Feeding trace minerals to beef cattle in Oklahoma
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