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The (co)variance components of BW at weaning (WW) were estimated for a Colombian multibreed beef cattle population. A single-trait animal model was used. The model included the fixed effect of contemporary group (sex, season, and year), and covariates including age of calf at weaning, age of cow, individual and maternal heterozygosity proportions, and breed percentage. Direct genetic, maternal genetic, permanent environmental, and residual effects were included as random effects. Direct, maternal, and total heritabilities were 0.23 +/- 0.047, 0.15 +/- 0.041, and 0.19, respectively. The genetic correlation between direct and maternal effects was -0.42 +/- 0.131, indicating that there may be antagonism among genes for growth and genes for maternal ability, which in turn suggests that improving WW by direct and maternal EPD may be difficult. A greater value for the direct heterosis effect compared with the maternal heterosis effect was found. Furthermore, the greater the proportion of Angus, Romosinuano, and Blanco Orejinegro breeds, the less the WW.

We study the relationship between the off-farm labor decision and the limited-resource farmers' and spouses' off-farm wages, experience, education, and sources of income. We found that farmers' and spouses' off-farm experience and wages are significant factors in explaining the off-farm labor supply decision. Contrary to expectations, farm income variability is not significant in the farmers' and spouses' decision to seek off-farm work. The off-farm labor supply of farmers and their spouses is negatively correlated with income transfers from the government. It was also found that the spouse is a residual supplier of on-farm and off-farm labor.

En los Ovinos de Pelo Criollos Colombianos (OPC) se distinguen principalmente los Sudán y Etiope, aunque no existe consenso en cuanto a su clasificación racial, puesto a que se carecen de estudios etnológicos que ayuden a sustentar si se deben considerar como una o más de una raza; por lo tanto, se tuvo como objetivo evaluar la variabilidad morfoestructural de ovinos Sudán y Etiope. Esta investigación fue desarrollada la región Caribe de Colombia. Fueron evaluadas un total de 180 ovejas Etiope, Sudán Bayo y Sudán Blanco. El análisis estadístico consistió en la estimación de estadística descriptiva, análisis de varianza (P≤0,05), análisis de componentes principales, análisis discriminante canónico y correlaciones de Pearson. Para el análisis de los datos se utilizaron los softwares InfoStat (2016I) y SPSS (19,0). En los resultados, se determinó que las Etiope poseen un menor potencial morfoestructural que las Sudán, dicha diferencia es estadísticamente significativa. Se requirieron sólo dos componentes principales para explicar el 100% de la variabilidad de los datos. Las funciones canónicas estimadas presentaron la capacidad de separar significativamente a los OPC. Además, se determinó que el grado de homogeneidad en las ovejas evaluadas no fue bajo. A partir de este trabajo, se sugiere desde la morfología que los Sudán y Etiope sean catalogados como diferentes racialmente.

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Abstract. This paper describes a high-resolution Level-3 (L3) altimeter Data Unification and Altimeter Combination System (DUACS) experimental regional product developed with support from the French space agency (CNES). Deduced from full rate (20 Hz to 40 Hz) Level-2 (L2) altimeter measurements, this product delivers Sea Level Anomalies (SLA) and other essential physical variables with a nearly 1-Km sampling over the North Atlantic 0cean. It allows us to resolve wavelengths from ~35 km to ~55 Km depending on the altimeter considered. This was made possible by recent advances in radar altimeter processing for both Synthetic aperture Radar (SAR) and Low-Resolution Mode (LRM) measurements, and improvements made to different stages of the DUACS processing chain. Firstly, the new adaptive and LR-RMC (Low Resolution with Range Migration Correction) processing techniques were considered for Jason and Sentinel-3 (S3A) respectively. They significantly reduce errors at short wavelengths and, for the adaptive processing, possible land contamination near the coast. Next, up-to-date geophysical and environmental corrections were selected for this production. This includes specific corrections intended to reduce the measurement noise on LRM measurement and thus enhance the observability at short wavelengths. Compared to the 1 Hz product, the observable wavelength reached with the experimental high-resolution product are reduced by up to one third, or up to half in the North-East Atlantic region. The residual noises were optimally filtered from full rate measurements taking into consideration the different observing capabilities of the altimeters processed. A specific data recovery strategy was applied, significantly optimizing the data availability both in the coastal and open ocean. This experimental L3 product is thus better resolved than the conventional 1 Hz product, especially near the coast where it is defined up to ~5 km against ~10 km for the 1 Hz version. The multi-mission cross-calibration processing was also optimized with an improved Long Wavelengths Error (LWE) correction leading to a better consistency between tracks with an 9–15 % reduction of SLA variance at cross-over. The experimental L3 product improves the overall consistency with tide gauge measurements with a reduction of the variance of the SLA differences by 5 and 17 % compared to the 1 Hz product from S3A and Jason-3 (J3) measurements respectively. Primarily intended for regional applications, this product can significantly contribute to improving high resolution numerical model outputs via data assimilation. It also opens new perspectives for a better understanding of regional sea surface dynamics, with an improved representation of the coastal currents and a refined spectral content that reveals the unbalanced signal.

A survey of cotton producers was conducted in Mississippi and Texas. The econometric model consists of a multinomial logit model of cotton producers' choice of marketing techniques. The results indicate that cotton acres positively influence pooling and negatively influence cash sales. Producers willing to incur higher transaction costs in market information systems and training tend to choose futures|options contracts and forward pricing. It was found that risk-averse producers tend not to choose pooling contracts. On the other hand, producers who seek abnormal gains through speculation tend to choose pooling contracts. Finally, producers who perceive markets as being price-efficient prefer cash sales. [EconLit citation: Q130.] © 2004 Wiley Periodicals, Inc. Agribusiness 20: 465-479, 2004.

The purpose of this study was to determine the epidemiology of leptospirosis in rural areas of Ciénaga de Oro, Córdoba, Colombia, a convenience sampling was carried out on 13 farms. The sample size was 325 reproductive age cows, 11 canine samples, and 20 humans. The samples were subjected to MAT analysis with 11 serogroups of Leptospira interrogans sensu lato. Once the MAT results were received, urine samples were collected from 78 cows, along with 39 water samples, for bacteriological cultures and PCR for the 16S rRNA gene in L. interrogans sensu lato. Positive PCR samples were sequenced to determine the possible genome species. The leptospirosis seroprevalence was 74.5% in the cattle, 70.0% in the dogs, and 45.5% in the humans. Although isolation was not achieved, L. interrogans sensu lato was detected by PCR in three urine samples and in a sample of wastewater. The sequencing confirmed the circulation of pathogenic species. The high prevalence of antibodies for L. interrogans sensu lato and the molecular evidence led to the inference that the rural areas of Ciénaga de Oro are endemic and that cattle can act as renal carriers and contaminate water sources, which increases the risk of contracting leptospirosis.