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| Dargatz, David. |
| The NAHMS Beef '97 Study was designed to provide both participants and the industry with information on the nation's cow-calf population for education and research. The USDA's National Agricultural Statistics Service (NASS) collaborated with NAHMS to select a statistically-valid sample yielding 2,713 producers from 23 states. The 23-state target population represented 85.7 percent of U.S. beef cows on January 1, 1997, and 77.6 percent of U.S. beef operations. NASS enumerators collected data for this report via a questionnaire administered on-farm from December 30, 1996, through February 3, 1997. Contact for this paper: David Dargatz |
| Tipo: Report |
Palavras-chave: NAHMS; Beef; Cattle; Cow-calf; Labor; Identification; Weaning; Marketing; Breeding; Calving; Livestock Production/Industries. |
| Ano: 1997 |
URL: http://purl.umn.edu/32742 |
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| Dargatz, David. |
| As part of the National Animal Health Monitoring System (NAHMS ), USDA:APHIS:Veterinary Services conducted a national study of beef production, the Beef Cow/Calf Health and Productivity Audit (CHAPA). This study was designed to provide both participants and the industry with information on cow/calf health, productivity, and management practices. Data for Part III: Beef Cow/Calf Health & Health Management were collected by federal and state veterinary officers (VMO's) in 18 of the largest cow/calf producing states between January 4 and February 28, 1993. These 18 states represented 70 percent of the U.S. beef cow inventory. Participating producers had five or more beef cows or beef replacement heifers and fifty percent or more of their 1992 calf crop... |
| Tipo: Report |
Palavras-chave: NAHMS; Epidemiology; Beef cattle; Calves; Breeding; Calving; Calf crop; Replacement heifers; Economics; Sales; Disease; Parasites; Pinkeye; Scours; Livestock Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/32748 |
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| Mayet, C.; Testut, L.; Legresy, B.; Lescarmontier, L.; Lyard, F.. |
| In February 2010, the Mertz Glacier Tongue (MGT) calved, releasing an 80 x 40 km iceberg. We have developed a high-resolution barotropic ocean model of the region to simulate the local circulation in response to tides and atmospheric forcing. We improved the coastline, grounding line position and built a new bathymetry using satellite imagery and older bathymetry data to derive the best available tidal model for the region. We compared this and other available models to seven different sea level observations available in the area and significantly improved the tidal solutions reaching a root sum square of 2.3 cm. This model was then run in different bathymetric configurations, considering the ice draft of the major icebergs B9B and C28, to simulate the... |
| Tipo: Text |
Palavras-chave: Mertz Glacier; Icebergs; Calving; Barotropic; Model. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00244/35568/34097.pdf |
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| Lescarmontier, L.; Legresy, B.; Young, N. W.; Coleman, R.; Testut, L.; Mayet, C.; Lacroix, P. |
| We investigated the evolution of two major rifts cutting across Mertz Glacier Tongue, East Antarctica, using a combination of satellite images and 60 day sets of GPS data from two stations deployed either side of the western rift in 2007. The eastern rift began to open in the early 1990s, and the western rift initiated in 2002 in conjunction with the collision of a large iceberg with the tongue. Velocity time series derived from the 2007 GPS data exhibited strong variations at tidal periods modulated by sea-surface height and sea-surface slope and reproduced here with a conceptually simple model. We found that opening of the western rift in 2002 leads to a dramatic change in behavior of the tongue as the large range in velocity (700-2400 m a(-1)) observed... |
| Tipo: Text |
Palavras-chave: Antarctic glaciology; Calving; Crevasses; Glacier flow; Glacier mechanics. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00489/60023/63276.pdf |
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