Fifty years of progress for beef cattle production in the United States.

An R-squared value greater than 0.7 indicated a strong trend and values less than 0.2 indicated little change or the inability to predict a change over the period.

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Application rates indicated a weak trend towards a small increase in N applied and no change in P application over time.

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Highly significant linear trends were found for final CW, days on feed and feed intake.

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Sorghum silage showed a trend for increased yield with over a 50% decrease in land area and a major increase in the portion irrigated.

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