Animal Husbandry

Agricultural Field Experiments by Roger G. Petersen

By Roger G. Petersen

This article presents statistical and biometrical strategies for designing, undertaking, examining and reading box experiments. It addresses an important study themes in agriculture, together with agronomy, breeding and pasture trials; farming structures study; and intercropping study.

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As with livestock products, trade in live animals is subject to animal health standards, such as those of the World Organisation for Animal Health (OIE, from the International Office of Epizootics in French) under the World Trade Organization’s Sanitary and Phytosanitary (SPS) Agreement, as well as to private standards that may be required by buyers such as supermarkets, so as to control against unacceptable risks to animal and human health. Periodic animal disease outbreaks can disrupt international trade in live animals.

This implies declines in other uses of grain, such as for direct human consumption, or an increase in grain imports or possibly both. Such trends are part of the supply-side response to growing demands for livestock products in many countries and perhaps part of national self-sufficiency objectives. Increased grain imports have been especially notable in land-scarce economies such as those of Northeast Asia, where resource endowments do not encourage either large-scale cropping or pasture-based livestock production.

Changes in Total Consumption Observed changes in total consumption of livestock products depend on the growth rate of the total population, in addition to changes in consumption per person. 3. , 1999, it is apparent that population growth rates in the developing world have slowed over recent years. 2% per year since 1992. 7% (1992–2002). A similar slowdown in population growth also occurred in the industrial world. Thus population growth would appear to have had a smaller impact in explaining total growth in consumption during the past decade than was the case earlier.

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