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At least 1,081 records · Page 60Linked to original sources
PubMed1983

Production of fine-wool ewes on yearlong rangeland in West Texas. II. Effects of supplemental feed and breeding frequency on reproductive rate.

Reproductive rate was compared in once-a-year and accelerated lambing ewes given various winter supplemented feed treatments during a 4-yr study. The study involved 165 commercial Rambouillet ewes. The accelerated lambing ewes had a lower attrition rate (P = .20) and final weight (P less than .05) and produced more lambs (P less than .01), lighter weight lambs at birth (P less than .05) and weaning (P less than .01), a lower frequency of twins (P less than .05) and an equal total weight of weaned lamb (P greater than .25) compared with once-a-year lambing ewes. Significant effects of feeding were detected only in a higher attrition rate in fed vs control ewes (P less than .02) and in a higher twinning frequency in fed vs control ewes (P less than .05). It is suggested that attrition rate is positively associated with twinning frequency. Accelerated lambing failed to substantially increase total lamb production, primarily because fall-lambing ewes failed to rebreed for summer lambs in spite of supplemental feed and as a result, continued in a fall lambing pattern.

Animal Feed↗
PubMed1979

[Study on decontamination of radioactive ruthenium by steel wool in waste solution (author's transl)].

Tracer experiments were done in order to establish a decontamination process of 106Ru in radioactive waste solution by column method paying special attention on the solution of nitratonitrosyl complex of Ru which is often encountered as a low level radioactive waste solution. It turned out that metallic iron was the most effective decontaminating agent among the several tens of materials tested. The decontamination factor (DF) of 106Ru increased in proportion to the total surface area of iron and it sensitively depended on the oxidation state of the surface as revealed by the batchwise and columnwise tests. Iron samples with high corrosiveness gave a much larger DF than those with low corrosiveness. The decontamination process proceeded as iron was being oxidized via Fe(metal)leads toFe(II)leads toFe(III). As the results, the DF initially increased after initiating the passage of water through the column but it then decreased as the oxidation process became inactive. An excellent durability up to 10000 bed volumes was demonstrated by the column method at a high average DF of 150.

Alloys↗