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Search Results: 1 - 10 of 13168 matches for " herd performance "
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Characterization of pig farms in the main swine producing regions of Colombia
Díaz,Carlos A; Rodríguez,María N; Vera,Víctor J; Ramírez,Gloria; Casas,Gloria A; Mogollón,José D;
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: the goal of this study was to characterize intensive pig farms with inventories of 200 or more sows. farms were located in the three major swine rearing areas of colombia, representing 62% of the national total sow inventory. a random sample of 67 farms was evaluated, considering a 95% confidence level, 10% precision and 50% variability. a survey was applied to each farm, registering health and production indexes within each production stage, such as acclimatization, farrowing, weaning, and growing/finishing. index differences between regions were established (p<0.05) and herd performance was analyzed to identify strengths and weaknesses of the main colombian swine industry. herds in the evaluated regions had a 87.6% farrowing rate, with a total of 11.7 pigs born per litter, of which 10.8 were born alive; and 10 pigs were weaned per litter, with an average production of 22.3 pigs weaned per sow/year. the average slaughter age was 166.1 days with 102.2 kg per pig. indexes established in the present study were similar or higher compared to the ones reported for other countries. these data suggest that colombian swine producers still have great opportunities to increase profitability if production costs decrease and the number of pigs and the amount of pork produced per year is increased.
Caracteriza??o e avalia??o da pastagem do rebanho de agricultores familiares do nordeste paraense
Sarmento, Célia M. B.;Veiga, Jonas Bastos;Rischkowsky, Barbara;Kato, Osvaldo R.;Siegmund-Schultze, Marianna;
Acta Amazonica , 2010, DOI: 10.1590/S0044-59672010000300002
Abstract: in northeastern pará, smallholder agriculturalists have established small pastures and manage small herds, mainly with the objective of investing profits in their crops, as a form of savings to meet the family's and property's future needs. there are indications of pasture and herd problems that limit production and sustainability, and threaten the crops that really sustain the property. this study sought to identify constraints and technological solutions, and make information available for public policies. in the 1st phase of this study and using 38 smallholdings sampled at random, the pastures and herd management were described, and in the 2nd phase, with a smaller sample of 12 smallholdings during 29-month period, the potential of these two components was evaluated. in general, the smallholdings have low-productivity and ranching is vulnerable. due to the low soil fertility and the deficient management, pastures do not supply all the herd's feed needs, neither in quantity nor quality. herd management deficiencies are characteristic of extensive production systems. however, these constraints can be overcome with well-known technologies of pasture establishment, maintenance and management, and herd reproduction, calf management, and herd health, allowing significant improvement. new exploitation models were suggested also.
Impact of successive lactation, year, season of calving and test milking on cows’ milk performance of the Polish Holstein-Friesian Black-and-White breed
Beata SITKOWSKA,DARIUSZ Piwczyński
Journal of Central European Agriculture , 2011, DOI: 10.5513/jcea01/12.2.913
Abstract: The research was conducted based on 8895 test milkings of 463 milk cows calving first time in 2003 and reared in the Pomorze and Kujawy region. The aim of the present study was to analyse the influence of selected factors on the milk performance and its chemical composition. A statistical influence of a herd, season and year of calving, a season of test milking, lactation on milk performance traits was analysed using a multiple variance analysis. The milk performance, its chemical composition and quality altered considerably depending on the season of calving, season of test milking and successive lactation. The highest percentage amount of milk and its components was obtained from cows calving in spring months. In turn, the highest content of fat, protein, lactose and dry matter occurred in the samples collected from the cows calving in the summer milking period. The highest amounts of milk were collected in the summer period, and the lowest – in the winter period (these dissimilarities proved highly significant). The highest amount of calculated FCM and ECM, fat (kg) and lactose was collected from cows in their first lactation, whereas the lowest from those in their fourth lactation.
Sow rearing in north Italy: I. analysis of technical and productive characteristics of different herds
C. Ceolin,F. Tagliapietra,S. Schiavon
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2005.2s.473
Abstract: There is a lack of information about reference values for the main productive and reproductive indexes for the sow herds in North Italy. This investigation was aimed to collect data from different kind of sow herds placed in the Veneto Region, in order to achieve representative values, in terms of mean and variability, for the main indexes of productivity: herd composition, feed consumption and feed composition.
Caracterización de los sistemas de producción porcina en las principales regiones porcicolas colombianas Caracteriza o dos sistemas de produ o de suínos nas principais regi es suínas da Col mbia Characterization of pig farms in the main swine producing regions of Colombia
Carlos A Díaz,María N Rodríguez,Víctor J Vera,Gloria Ramírez
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: El presente estudio tuvo como objeto caracterizar productivamente las granjas porcícolas colombianas de producción intensiva con más de 200 hembras en el pie de cría en las tres regiones con mayor influencia sobre la producción nacional lo cual representó el 62% del inventario nacional de madres. Se seleccionó aleatoriamente una muestra de 67 granjas con un nivel de confianza del 95%, una precisión del 10% y una variabilidad del 50%. Se aplicó una encuesta para estimar los principales indicadores sanitarios y de productividad en cada una de las etapas de producción: aclimatización, cría, precebo y ceba. Se establecieron las diferencias de los indicadores entre las regiones evaluadas (p<0.05) y se obtuvo una aproximación al desempe o productivo de las granjas identificando las fortalezas y debilidades de los sistemas en las regiones estudiadas. En promedio se estimó que las granjas tienen una tasa de parición del 87.6%, un promedio de 11.7 lechones nacidos totales, 10.8 lechones nacidos vivos y 10 lechones destetos por cerda; producen 22.3 lechones por cerda al a o y sacrifican animales de 102 kg de peso con 166.1 días al sacrificio en promedio. Los resultados obtenidos demostraron que los indicadores de competitividad son similares a los reportados en otros países e inclusive superiores, siendo importante considerar que la porcicultura colombiana está en capacidad de disminuir costos de producción asociados al incremento en el número de cerdos y kilogramos producidos por cerda al a o. Este estudo teve como objectivo caracterizar produtivamente as empresas suínas com mais de e 200 fêmeas reprodutoras em três regi es com maior influência nacional, que representaram 62% do inventário nacional das m es. Foi seleccionada aleatoreamente uma amostra de 67 granjas com um nível de confian a de 95%, uma precis o de 10% e uma variabilidade de 50%. Um inquérito foi utilizado para estimar indicadores de saúde e produtividade em todas as fases de produ o: aclimata o, cria, reprodu o, pré engorda e engorda. Foram encontradas diferencias entre granjas nos indicadores entre as regi es avaliadas (p<0.05) e obteve-se uma aproxima o do desempenho produtivo das granjas identificando-se os pontos fortes e fracos dos sistemas nas regi es estudadas. Em média as granjas agrícolas apresentaram uma taxa de natalidade do 87.6%, 11.7 leit es nascidos totais, 10.8 leit es nascidos vivos e 10 leit es desmamados por porca, produzidos 22.3 leit es por porca por ano e o abate foi de 102 kg com 166.1 dias. Os resultados mostraram que os indicadores da competitividade s o semelhantes a
Reproductive Trends in Cebu Cattle Grazing Rice Crop Residues in Colombian Tropical Dry Forest  [PDF]
Elisa Sierra-Montoya, Rolando Barahona-Rosales, Z. Tatiana Ruíz-Cortés
Open Journal of Forestry (OJF) , 2013, DOI: 10.4236/ojf.2013.34B003
Abstract:

The objective of this study was to describe the trend of reproductive performance of primiparous and multiparous cows that grazed rice crop residues located in a Dry Tropical Forest of Colombia, taking into account the rainfall pattern of the place. In this study, 89 primiparous and 309 multiparous Cebu cattle records were analyzed. Mean, mean standard deviation for age at first calving and open days of primipar-ous Cebu cattle were 41.05± 1.85 months and 269.7±36.25 days respectively. Confidence intervals (95%) for both reproductive parameters were 36.8-45.3 months and 202.7-336.6 days respectively. For multiparous Cebu cattle, the mean and mean standard deviation for open days and calving interval were 245.6±36.8 days and 17.5±0.9 months respectively. Confidence intervals 207.1-366.9 days and 13.9-20.7 months respectively. The mean rainfall since 1999 until 2012 was1202 mmper year. The reproduc-tive trend of the primiparous cattle showed an increasing behavior of age at first calving since 1999 until 2012, that can possibly be explained due to the decreasing behavior of the rainfall throughout the years, that can affect the nutritional value and offer of the grass that can grow in the borders of the crop, such as Guinea and Star grass, and eventually affect the body condition and weight necessary to be ready for the first estrous. An inverse behavior of open days occurred, showing a decreased trend along the last years of research. This fact could have happened due to the intensive use of the enriched rice straw with urea and molasses lately. Regarding to the reproductive trend of the multiparous cattle, there is no an evident pat-tern of it. Factors such as rainfall, temperature, nutrition and management should have affected it. Further research on this topic is needed.

The Herd Behavior of Risk-Averse Investor Based on Information Cost  [PDF]
Guangming Deng
Journal of Financial Risk Management (JFRM) , 2013, DOI: 10.4236/jfrm.2013.24015
Abstract: In this paper, the traditional model of herd behavior was improved and extended. The herd behavior of risk-averse investor based on information cost was studied in the financial market. By refining the concept of Bayes equilibrium and the analysis of the behavior of investors, it was discovered that the herd behavior of the second risk-averse investor did not produce until the first risk-averse investors chose to buy information.
How the Asymmetric Information Creates Bubbles in Stock Market?  [PDF]
Haoxian Wang, Xingyuan Wang, Fan Bu, Guanzhou Wang, Yanqiao Pan
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.68016
Abstract: We analyze the mechanism of creating bubbles under asymmetric information through literature review. Our hypothesis is that information asymmetry will lead to herd behavior and then herd behavior will create bubbles. We find papers and evidences to support our hypothesis. However, after those literature reviews, we consummated our hypothesis and gave a conclusion. Our conclusion is the information asymmetry which can lead to herd behavior and there is a transaction phase. Herd behavior can create bubbles only when shocks come into the market. The bubble will enhance the herd behavior and then further create bubbles. In the first part of our hypothesis, we find three types of papers to support information asymmetry which can lead to herd behavior, which are theoretical model, mathematical model and experiment. It is similar in the second part of our hypothesis, which is herd behavior that can create bubbles.
Células somáticas no leite em rebanhos brasileiros
Machado, Paulo Fernando;Pereira, Alfredo Ribeiro;Silva, Luís Felipe Prada e;Sarriés, Gabriel Adrian;
Scientia Agricola , 2000, DOI: 10.1590/S0103-90162000000200026
Abstract: a survey of data of the lactation physiology laboratory of esalq - usp, piracicaba, sp, brazil was performed to characterize the somatic cell count (scc) of herds. descriptive statistics was used to analyze results of 7941 records collected between december 1996 and july 1998. the scc mean was 641 thousand cells ml-1, standart deviation 767 thousand cells ml-1. the log2 transformation was also applied to scc values, a new mean was calculated and then again transformed into scc (307 thousand cells ml-1). this was the best way to present the real scc values of the herds. the population of herds are distributed according to scc count, considering the scc limits of 250, 500, 750, 1000, 1250 e 1500 thousand cells ml-1, in the following percentages: 26, 53, 71, 83, 89, 93%. the quartiles of the samples were 25, 50, 75, 90, 95, 99 e 100% showing 244, 468, 815, 1302, 1797, 4099, 9223 thousand cells ml-1 respectively.
Optimal hjordsammans ttning - ett systemanalytisk problem
?je Danell
Rangifer , 1984,
Abstract: Optimal hjordsammans ttning - ett systemanalytisk problem.
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