Como calcular a proporção touro: vaca para a estação de monta de bovinos de corte.

bitstream/item/37275/1/Circular53.pdfISSN 1981-208

Satellite Chartography of Atmospheric Methane and carbon monoxide from SCIAMACHY onboard ENVISAT

The UV/Vis/near infrared spectrometer SCIAMACHY on board the European ENVISAT satellite enables total column retrieval of atmospheric methane with high sensitivity to the lower troposphere. The vertical column density of methane is converted to column averaged mixing ratio by using carbon dioxide retrievals as proxy for the probed atmospheric column. For this purpose, we apply concurrent total column measurements of CO_2 in combination with modeled column-averaged CO_2 mixing ratios. Possible systematic errors are discussed in detail while the precision error is 1.8% on average. This paper focuses on methane retrievals from January 2003 through December 2004. The measurements with global coverage over continents are compared with model results from the chemistry–transport model TM4. In the retrievals, the north-south gradient as well as regions with enhanced methane levels can be clearly identified. The highest abundances are found in the Red Basin of China, followed by northern South America, the Gangetic plains of India and central parts of Africa. Especially the abundances in northern South America and the Red Basin are generally higher than modeled. Further, we present the seasonal variations within the investigated time period. Peak values in Asia due to rice emissions are observed from August through October. We expand earlier investigations that suggest underestimated emissions in the tropics. It is shown that these underestimations show a seasonal behavior that peaks from August through December. The global measurements may be used for inverse modeling and are thus an important step towards better quantification of the methane budget

A inseminação artificial em tempo fixo como biotécnica aplicada na reprodução dos bovinos de corte.

A sincronização do estro é uma importante ferramenta para otimizar o manejo reprodutivo em bovinos de corte. Protocolos que concentram a reprodução de vacas cíclicas e induzem a ovulação em novilhas pré-puberes e vacas em anestro aumentam as taxas reprodutivas e aceleram o ganho genético dos rebanhos pelo uso da inseminação artificial (IA). A presente revisão aborda diferentes protocolos de controle do ciclo estral em vacas de corte para a adoção da biotécnica conhecida como IA em tempo fixo (IATF)

Sincronização da ovulação em vacas da raça Nelore e seus efeitos na função ovariana.

bitstream/CPPSE/16810/1/Boletim07.pdfISSN 1517-198

Metodologia para obtenção de concepto bovino

bitstream/CPPSE-2009/18334/1/Boletim19.pdfISSN 1517-198