The Development of Forage Nutrient Value Coefficients for Use in CARD\u27s 1985 RCA Model

After preliminary work on the livestock sector for the 1985 CARD/RCA model was completed in the summer of 1983, it was felt that one of the weaker areas in the sector was the linkage between the livestock sector and the range sector. At that time it was decided that the best way to approach this problem would be through the development of feed transfer activities. The purpose of this paper is to present a brief overview of the development of the nutrient value coefficients for net energy, protein, calcium, and phosphorus supplied by grazed forages in the 31 market regions. The data developed in this paper serves as coefficients for feed transfer activities in the livestock sector of the CARD/RCA model

A MARKOV CHAIN ANALYSIS OF PORK FARM SIZE DISTRIBUTIONS IN THE SOUTH: REPLY

Livestock Production/Industries,

Resource Conservation Act Analysis: A Documentation of the Endogenous and Exogenous Livestock Sectors of the Agricultural Resource Interregional Modeling System

One of the major sectors within the Agricultural Resource Interregional Modeling System is the livestock sector. There are two types of sectors developed in this manuscript. When location and rations of the livestock sector can be fixed, and the analysis is not going to significantly impact the sector, a fully exogenous sector can be implemented. However, in many cases location of livestock production depends on the competitive nature of each region. This can change as a result of a shift in production, resource limitations, resource surpluses, changes in resource availability or costs, etc. If the analysis is to evaluate the impacts these types of changes will have an livestock, then a partially endogenous livestock sector is required

Consistent patterns of common species across tropical tree communities

Trees structure the Earth’s most biodiverse ecosystem, tropical forests. The vast number of tree species presents a formidable challenge to understanding these forests, including their response to environmental change, as very little is known about most tropical tree species. A focus on the common species may circumvent this challenge. Here we investigate abundance patterns of common tree species using inventory data on 1,003,805 trees with trunk diameters of at least 10 cm across 1,568 locations1,2,3,4,5,6 in closed-canopy, structurally intact old-growth tropical forests in Africa, Amazonia and Southeast Asia. We estimate that 2.2%, 2.2% and 2.3% of species comprise 50% of the tropical trees in these regions, respectively. Extrapolating across all closed-canopy tropical forests, we estimate that just 1,053 species comprise half of Earth’s 800 billion tropical trees with trunk diameters of at least 10 cm. Despite differing biogeographic, climatic and anthropogenic histories7, we find notably consistent patterns of common species and species abundance distributions across the continents. This suggests that fundamental mechanisms of tree community assembly may apply to all tropical forests. Resampling analyses show that the most common species are likely to belong to a manageable list of known species, enabling targeted efforts to understand their ecology. Although they do not detract from the importance of rare species, our results open new opportunities to understand the world’s most diverse forests, including modelling their response to environmental change, by focusing on the common species that constitute the majority of their trees.Publisher PDFPeer reviewe

The Development of Forage Nutrient Value Coefficients for Use in CARD's 1985 RCA Model

After preliminary work on the livestock sector for the 1985 CARD/RCA model was completed in the summer of 1983, it was felt that one of the weaker areas in the sector was the linkage between the livestock sector and the range sector. At that time it was decided that the best way to approach this problem would be through the development of feed transfer activities. The purpose of this paper is to present a brief overview of the development of the nutrient value coefficients for net energy, protein, calcium, and phosphorus supplied by grazed forages in the 31 market regions. The data developed in this paper serves as coefficients for feed transfer activities in the livestock sector of the CARD/RCA model.</p

Development of Forage Nutrient Value Coefficients for Use in CARD's 1985 RCA Model, The

After preliminary work on the livestock sector for the 1985 CARD/RCA model was completed in the summer of 1983, it was felt that one of the weaker areas in the sector was the linkage between the livestock sector and the range sector. At that time it was decided that the best way to approach this problem would be through the development of feed transfer activities. The purpose of this paper is to present a brief overview of the development of the nutrient value coefficients for net energy, protein, calcium, and phosphorus supplied by grazed forages in the 31 market regions. The data developed in this paper serves as coefficients for feed transfer activities in the livestock sector of the CARD/RCA model.

Resource Conservation Act Analysis: A Documentation of the Endogenous and Exogenous Livestock Sectors of the Agricultural Resource Interregional Modeling System

One of the major sectors within the Agricultural Resource Interregional Modeling System is the livestock sector. There are two types of sectors developed in this manuscript. When location and rations of the livestock sector can be fixed, and the analysis is not going to significantly impact the sector, a fully exogenous sector can be implemented. However, in many cases location of livestock production depends on the competitive nature of each region. This can change as a result of a shift in production, resource limitations, resource surpluses, changes in resource availability or costs, etc. If the analysis is to evaluate the impacts these types of changes will have an livestock, then a partially endogenous livestock sector is required.</p

Ethanol and Agriculture: Effect of Increased Production on Crop and Livestock Sectors

Expanded ethanol production could increase U.S. farm income by as much as $1 billion (1.4 percent) by 2000. Because corn is the primary feedstock for ethanol, growers in the Corn Belt would benefit most from improved ethanol technology and heightened demand. Coproducts from the conversion process (corn gluten meal, corn gluten feed, and others) compete with soybean meal, so soybean growers in the South may see revenues decline. The U.S. balance of trade would improve with increased ethanol production as oil import needs decline

Resource Conservation Act Analysis: A Documentation of the Endogenous and Exogenous Livestock Sectors of the Agricultural Resource Interregional Modeling System

One of the major sectors within the Agricultural Resource Interregional Modeling System is the livestock sector. There are two types of sectors developed in this manuscript. When location and rations of the livestock sector can be fixed, and the analysis is not going to significantly impact the sector, a fully exogenous sector can be implemented. However, in many cases location of livestock production depends on the competitive nature of each region. This can change as a result of a shift in production, resource limitations, resource surpluses, changes in resource availability or costs, etc. If the analysis is to evaluate the impacts these types of changes will have an livestock, then a partially endogenous livestock sector is required.