I N much of the Northern Great Plains area native grasses are of paramount importance to livestock production and hays from these grasses constitute the chief roughage harvested to maintain livestock when grazing will not support them. Tonnage of prairie hay harvested in South Dakota in 1948 and 1949, a total of 4,492,000 tons, was twice as great as the harvested tonnage of all tame hays combin...

Two studies were conducted to evaluate sorting and feeding Zilpaterol hydrochloride (ZH) on feedlot performance and carcass characteristics. Cross-bred beef steers were used in a randomized block design finishing trial. In Exp. 1, (initial BW 342 ± 10 kg, n = 1,000) 5 treatments included an unsorted non-ZH fed negative control (CON), unsorted ZH fed positive control (+CON); and three treatments...

1 Fresh data on English grain yields 1268-1480 are combined with revised price series to measure the frequency and scale of serious harvest shortfalls and estimate the elasticity of demand for cereals. Major food availability declines are shown to have been a significant component of most historical subsistence crises, as back-to-back shortfalls were of the worst famines. Although farmers did a...

Coastal peoples worldwide harvested and consumed a wide variety of shellfish. Most archaeological analyses of shellfish remains tend to focus on bivalves such as clams and mussels while other shellfish such as gastropods, barnacles, and crabs have received much less attention. Here we examine the use of Dungeness crabs (Cancer magister) at a late-Holocene village on Netarts Bay, northern Oregon...

Trait-based breeding is essential to improve wheat yield, particularly when stress adaptation is targeted. A set of modern and underutilized wheat genotypes was examined in a 2-year field experiment with distinct seasonal water supply. Yield formation and drought response strategies were analyzed in relation to components of Passioura's yield-water framework based on phenological, morphological...

sowing date is an important determinant of yield in canola. cultivation of winter rapeseed cultivars in semi arid regions of iran however it has high potential for production, but, mentioned cultivars are late maturity and this late maturity cause to that silique formation and seed filling periods mature in the same time with hot and dry weather condition. in contrast, spring rapeseed cultivars...

Life history traits of wild animals can be strongly influenced, both phenotypically and evolutionarily, by hunting and fishing. However, few studies have quantified fishery selection over long time periods. We used 57 years of catch and escapement data to document the magnitude of and trends in gillnet selection on age and size at maturity of a commercially and biologically important sockeye sa...