搜索结果：goose

SUMMARYGoose keeping can expand the choice of basic food materials and provides materials (feather and down) for light industry. There are various ways to produce goose meat using preferably white feathered breeds. Intensively reared broiler geese attain a slaughter weight of 5 kg by 56–63 days of age; under semi-intensive keeping they reach a slaughter weight of 6 kg by 16 weeks of age, and under extensive keeping (grazing) they can be slaughtered by 22–24 weeks of age. Fattened liver is produced with 9–24 weeks old liver type (Landaise) geese via cramming (force feeding) for 14–21 days by which time the liver weight can reach 600–1000 g. Goose fat is high in polyunsaturated fatty acids (PUFA) and along with goose meat can be considered as functional foods. The fattened goose liver is a delicacy, while goose eggs are mostly used as propagating material albeit with occasional consumption in some Asian countries. Most of the worldwide feather and down production originates from slaughtered geese; only 1–2% of the global production is removed manually. At scalding, the percentage of feather in body weight amounts to 3.8–5.5% in broiler vs. 3.4–5.3% in fattened goose, respectively. The feather and down obtainable from young geese (8–10 weeks old) per capita at their natural moulting time is 80–100 g on the first occasion. Six to 7 weeks later it amounts to 100–130 g and after another 6–7 weeks 140–170 g, respectively. In the EU only those countries where it is and was a traditional practice are allowed to harvest feathers from and force-feed geese. Some believe the objection and ban of these activities are scientifically unfounded.

暂无摘要（点击查看原文获取完整内容）

The suggested link between lemming cycles and reproductive success of arctic birds is caused by potential effects of varying predation pressure (the Alternative Prey Hypothesis, APH) and protective association with birds of prey (the Nesting Association Hypothesis, NAH). We used data collected over two complete lemming cycles to investigate how fluctuations in lemming density were associated with nesting success of greater snow geese ( Anser caerulescens atlanticus ) in the Canadian High Arctic. We tested predictions of the APH and NAH for geese breeding at low and high densities. Goose nesting success varied from 22% to 91% between years and the main egg predator was the arctic fox ( Alopex lagopus ). Nesting associations with snowy owls ( Nyctea scandiaca ) were observed but only during peak lemming years for geese nesting at low density. Goose nesting success declined as distance from owls increased and reached a plateau at 550 m. Artificial nest experiments indicated that owls can exclude predators from the vicinity of their nests and thus reduce goose egg predation rate. Annual nest failure rate was negatively associated with rodent abundance and was generally highest in low lemming years. This relationship was present even after excluding goose nests under the protective influence of owls. However, nest failure was inversely density‐dependent at high breeding density. Thus, annual variations in nest density influenced the synchrony between lemming cycles and oscillations in nesting success. Our results suggest that APH is the main mechanism linking lemming cycles and goose nesting success and that nesting associations during peak lemming years (NAH) can enhance this positive link at the local level. The study also shows that breeding strategies used by birds (the alternative prey) could affect the synchrony between oscillations in avian reproductive success and rodent cycles.

BACKGROUND: Geese were domesticated over 6,000 years ago, making them one of the first domesticated poultry. Geese are capable of rapid growth, disease resistance, and high liver lipid storage capacity, and can be easily fed coarse fodder. Here, we sequence and analyze the whole-genome sequence of an economically important goose breed in China and compare it with that of terrestrial bird species. RESULTS: A draft sequence of the whole-goose genome was obtained by shotgun sequencing, and 16,150 protein-coding genes were predicted. Comparative genomics indicate that significant differences occur between the goose genome and that of other terrestrial bird species, particularly regarding major histocompatibility complex, Myxovirus resistance, Retinoic acid-inducible gene I, and other genes related to disease resistance in geese. In addition, analysis of transcriptome data further reveals a potential molecular mechanism involved in the susceptibility of geese to fatty liver disease and its associated symptoms, including high levels of unsaturated fatty acids and low levels of cholesterol. The results of this study show that deletion of the goose lep gene might be the result of positive selection, thus allowing the liver to adopt energy storage mechanisms for long-distance migration. CONCLUSIONS: This is the first report describing the complete goose genome sequence and contributes to genomic resources available for studying aquatic birds. The findings in this study are useful not only for genetic breeding programs, but also for studying lipid metabolism disorders.

暂无摘要（点击查看原文获取完整内容）

We examined the role of trophic interactions in structuring a high arctic tundra community characterized by a large breeding colony of greater snow geese (Chen caerulescens atlantica). According to the exploitation ecosystem hypothesis of Oksanen et al. (1981), food chains are controlled by top-down interactions. However, because the arctic primary productivity is low, herbivore populations are too small to support functional predator populations and these communities should thus be dominated by the plant/ herbivore trophic-level interaction. Since 1990, we have been monitoring annual abundance and productivity of geese, the impact of goose grazing, predator abundance (mostly arctic foxes, Alopex lagopus) and the abundance of lemmings, the other significant herbivore in this community, on Bylot Island, Nunavut, Canada. Goose grazing consistently removed a significant proportion of the standing crop (∼40%) in tundra wetlands every year. Grazing changed plant community composition and reduced the production of grasses and sedges to a low-level equilibrium compared to the situation where the presence of geese had been removed. Lemming cyclic fluctuations were strong and affected fox reproduction. Fox predation on goose eggs was severe and generated marked annual variation in goose productivity. Predation intensity on geese was closely related to the lemming cycle, a consequence of an indirect interaction between lemming and geese via shared predators. We conclude that, contrary to the exploitation ecosystem hypothesis, both the plant/herbivore and predator/prey interactions are significant in this arctic community.

This paper presents a vulnerability within the generic object oriented substation event (GOOSE) communication protocol. It describes an exploit of the vulnerability and proposes a number of attack variants. The attacks sends GOOSE frames containing higher status numbers to the receiving intelligent electronic device (IED). This prevents legitimate GOOSE frames from being processed and effectively causes a hijacking of the communication channel, which can be used to implement a denial–of–service (DoS) or manipulate the subscriber (unless a status number roll-over occurs). The authors refer to this attack as a poisoning of the subscriber. A number of GOOSE poisoning attacks are evaluated experimentally on a test bed and demonstrated to be successful.

Abstract Intensification of agriculture since the 1950s has enhanced the availability, competitive ability, crude protein content, digestibility and extended growing seasons of forage grasses. Spilled cereal grain also provides a rich food source in autumn and in winter. Long‐distance migratory herbivorous geese have rapidly exploited these feeding opportunities and most species have shown expansions in range and population size in the last 50 years. Results of long‐term studies are presented from two Arctic‐breeding populations, the Svalbard pink‐footed goose and the Greenland white‐fronted goose (GWFG). GWFGs have shown major habitat shifts since the 1950s from winter use of plant storage organs in natural wetlands to feeding on intensively managed farmland. Declines in local density on, and abandonment of, unmodified traditional wintering habitat and increased reproductive success among those birds wintering on farmland suggest that density‐dependent processes were not the cause of the shift in this winter‐site‐faithful population. Based on enhanced nutrient and energy intake rates, we argue that observed shifts in both species from traditionally used natural habitats to intensively managed farmland on spring staging and wintering areas have not necessarily been the result of habitat destruction. Increased food intake rates and potential demographic benefits resulting from shifts to highly profitable foraging opportunities on increasingly intensively managed farmland, more likely explain increases in goose numbers in these populations. The geographically exploratory behaviour of subdominant individuals enables the discovery and exploitation of new winter feeding opportunities and hence range expansion. Recent destruction of traditional habitats and declines in farming at northern latitudes present fresh challenges to the well being of both populations. More urgently, Canada geese colonizing breeding and moulting habitats of white‐fronted geese in Greenland are further affecting their reproductive output.

The nutritional quality of forage plants varies in space and time. This variation is presumed to drive the annual migration of herbivore species which follow peaks in the availability of high quality forage between sites. The green-wave hypothesis predicts that during spring migration to northern breeding sites, geese and other herbivorous waterfowl travel along a climatic gradient, taking advantage of the flush of spring growth of forage plants at each stopover site along the gradient. Here, we explore a basic assumption of the green wave hypothesis which states that there are successive waves of forage availability along the East-Atlantic Flyway from temperate to arctic sites, as spring advances. We use one of the migration routes of the Barnacle Goose Branta leucopsis as a model to compare data on food quality and quantity of forage plants with the timing of migration along its migratory corridor. We collected data on forage biomass and quality at three saltmarsh sites along the traditional migration route of the Barnacle Goose: a temperate staging site in the Wadden Sea, a Baltic stopover site and a Russian sub-arctic breeding site. In all areas forage biomass increased in spring, while the nutritional quality peaked early in the season and declined with increasing biomass. We combined data on forage biomass and nutritional quality in one measure, the nutrient biomass. For all sites, nutrient biomass showed a peak in early spring. We used observations on goose migration to examine whether the geese utilise these peaks in nutrient biomass, as is predicted by the green wave hypothesis. Our data show that the geese utilise the Wadden Sea staging site and the Baltic stopover site at the moments of peak nutrient biomass. At the Russian breeding site, geese arrive prior to the flush of spring growth of forage plants and profit from the peak in nutrient biomass when the goslings hatch and adult birds start moulting. We conclude that spring nutrient biomass is a key factor driving the timing of the annual northern migration of avian herbivores

Blue geese at McConnell River, N.W.T., lost 20% of eggs, mostly late in incubation. Parasitic jaegers and herring gulls were attracted to the colony and were efficient at finding eggs although geese defended their nests strongly. Since egg loss could only occur in the absence of both geese, jaegers, and gulls acted as scavengers rather than predators. Factors causing desertion were the true causes of egg loss. These may have been inexperience of younger geese, or starvation during incubation.During nesting, geese had very little to eat and lost about 25% of spring weight. While the birds were fasting, weight loss is a function of heat loss, in turn controlled by weather conditions. The relationship between heat loss and several weather parameters was determined by means of a water-heated model goose in a simulated environment. This relationship allowed prediction of heat loss, and hence weight loss, from air temperature, wind speed, incident radiation, and goose surface temperature.Severe weather could result in considerable weight loss and it is suggested that this impaired the goose's ability to incubate steadily. Extreme weight loss could result in death, and many nesting geese were found apparently starved during the hatch.

An earlier onset of spring has been recorded for many parts of Eurasia in recent decades. This has consequences for migratory species, both in changing the conditions encountered by individuals on reaching migratory sites and in affecting cues regulating the timing of migration where decisions to migrate are influenced by local environmental variables. Here we examine the timing of spring migration for two arctic goose populations, the pink‐footed goose Anser brachyrhynchus (during 1990–2003) and barnacle goose Branta leucopsis (during 1982–2003), which both breed on Svalbard. The satellite‐derived Normalised Difference Vegetation Index (NDVI) was used to express the onset of spring at their wintering and spring staging sites. Pink‐footed geese use several sites during spring migration, ranging from the southernmost wintering areas in Belgium to two spring staging areas in Norway, and distances between sites used along the flyway are relatively short. There was a positive correlation in the onset of spring between neighbouring sites, and the geese migrated earlier in early springs. Barnacle geese, on the other hand, have a long overseas crossing from their wintering grounds in Britain to spring staging areas in Norway. Although spring advanced in both regions, there was no corresponding correlation in the timing of onset of spring between their wintering and spring staging sites, and little evidence for barnacle geese migrating earlier over the whole study period. Hence, where geese can use spring conditions at one site as an indicator of the conditions they might encounter at the next, they have responded quickly to the advancement of spring, whereas in a situation where they cannot predict, they have not yet responded, despite the advancement of spring in the spring staging area.

Theoretical work on disciplining corrupt agents has emphasized the role of expected future rents—for example, efficiency wages. Yet taken seriously this approach implies that illicit future rents should also deter corruption. We study this “golden goose” effect in the context of a statutory wage increase in India's employment guarantee scheme, comparing official microrecords to original household survey data to measure corruption. We estimate large golden goose effects that reduced the total impact of the wage increase on theft by roughly 64 percent. In short, rent expectations matter. (JEL D73, D82, H83, J41, K42, O17, O21)

We estimated the size of 30 defined populations of geese wintering in the Western Palearctic (including five released or reintroduced populations of three species). Fourteen populations were accurately estimated from almost full count coverage or robust sampling and ten were well estimated based on more than 50% of their total being counted. An estimated 5.03 million geese wintered in January 2009, up on 3.10 million in January 1993. Only two populations numbered less than 10,000 birds (Scandinavian Lesser White-fronted Goose and Svalbard/Greenland Light-bellied Brent Goose, the former being critically small within restricted range). Eighteen populations numbered 10,000–100,000, eight 100,000–1,000,000 and the largest 1.2 million individuals. Of 21 populations with known longer term trends, 16 are showing significant exponential increases, 4 are stable and one declining. Amongst these same populations, five are declining since the 1990s. Long term declines in productivity were found in 7 out of 15 populations. Amongst most of the 11 populations for which data exist, there were no significant long-term trends in annual adult survival. Improved monitoring, including demographic, is required to retain populations in favorable conservation status.

The aim of this study was to evaluate the fatty acid profile and health lipid indices of meat from 3 Polish local goose varieties (Romanian-RO, Pomeranian-PO, and Subcarpathian-SB) and the commercial cross White Kołuda goose (W31). Birds were fed ad libitum with the same complete feeds until 17 wk of age. The geese (n = 72) with body weight close to the arithmetic mean in particular flock were fasted for 12 h and slaughtered in an experimental slaughterhouse (18 females in each flock). Carcasses were stored at 2 to 4°C for 24 h. The breast muscles (m. pectoralis major) were cut out from the left side of carcass, separately vacuum-packed, and stored at -80°C until analysis. Fatty acid profile of meat was determined by gas chromatography and health lipid indices were calculated. The W31 muscles had a higher percentage of C 18:0 and a lower of C 16:0 than those of RO, PO, and SB geese. The W31 muscles were characterized by a significantly higher proportion of monounsaturated fatty acids (46.5%) than remaining ones (43.28%-PO, 43.38%-SB, and 44.24%-RO). The lowest proportion of polyunsaturated fatty acids was established for W31 muscles (22.05%). The breast muscles of RO, SB, and PO had more favorable polyunsaturated n-6 and n-3 fatty acid (PUFA)/ saturated fatty acid (SFA) ratio (0.85, 0.82, 0.83, respectively) than W31 geese (0.72). The current findings showed that UFA/SFA, PUFA/SFA, and PUFA n-6/n-3 ratios in RO and SB muscles were within the optimum values for human diets. No significant differences were observed in the atherogenic, thrombogenic, and hypocholesterolemic/hypercholesterolemic indices between the analyzed muscles. Commercial W31 geese breast muscles showed a lower value (43.90%) of peroxidizability index (PI) compared to SB (52.88%), PO (53.93%), and RO (53.47%). However, the higher values of the PUFA/SFA and PI in the meat of SB, PO, and RO birds may indicate a higher prohealth value of their meat.

Canada geese (Branta canadensis) have increased in numbers in North America during the past 50 years. This expansion has resulted in goose-inflicted damage to many grain and green forage crops in rural areas (Horn 1949, Bossenmaier and Marshall 1958, Hunt and Bell 1973, Sugden 1976, Clark and Jarvis 1978, Hunt 1984). Recently, an increasing number of complaints has come from suburban and urban areas where geese forage on lawns located in parks, beaches, golf courses, country clubs, and backyards (Hawkins 1970, Laycock 1982). Even low numbers of geese can damage the grass and litter areas with their defecations. High densities of feces reduce the esthetic value and recreational use of these areas (Fig. 1) and are often perceived as health hazards. Droppings from large flocks of geese can also contribute to the over-fertilization of small lakes and reservoirs. This study addresses the history, extent, and severity of nuisance goose problems through surveys of water companies in Connecticut and golf courses throughout the eastern United States.

Security issues for the power industry have become increasingly relevant during the past decade as the industry has relied more and more on communication protocols. The Generic Object Oriented Substation Events (GOOSE) protocol is defined in IEC 61850 for the purpose of distributing event data across entire substation networks. In this paper we demonstrate a practical attack by exploiting weaknesses in GOOSE. We also show that this attack can have devastating consequences on the reliability of the grid and is capable of creating a widespread interruption in power generation and distribution.

The domestic goose Anser anser, a grazing species, takes in considerable quantities of cellulose as part of its food. Investigations were carried out to discover whether cellulose is digested in the gut to any extent. The experiments and techniques for establishing through-put rates are discussed. It is unlikely that cellulose digestion contributes significantly to the goose's food up-take.

Abstract The green consumer has been the central character in the development of green marketing, as businesses attempt to understand and respond to external pressures to improve their environmental performance. Marketing practitioners and academics are attempting to identify and understand green consumers and their needs, and to develop market offerings that meet these needs. So far there is little consensus about the identity and nature of green consumers, except that they have been something of a disappointment to the marketers who have pursued them. These difficulties perhaps reflect the folly of trying to understand green consumption and green marketing by viewing it as simply a variation on conventional marketing. This article proposes some different ways of looking at green consumption and green marketing, which have the potential to prevent the hunt for the green consumer from deteriorating into a wild goose chase. Copyright © 2001 John Wiley & Sons, Ltd and ERP Environment

1. We studied age-related reproductive success in a recently established breeding colony of barnacle goose Branta leucopsis on the island of Gotland, Sweden.2. Associations of age and breeding experience with several reproductive parameters were investigated by comparing the success of individuals of 2, 3, 4 and >=5 years of age. Also, we measured the within-individual changes in reproductive parameters as the individuals grew older.3. Associations between survival and reproductive success were investigated by comparing the reproductive success of 2, 3 and 4-year-old birds that returned or did not return, respectively, in the subsequent breeding season.4. The reproductive success increased up to an age of 4-5 years. Thus, clutch size, number of hatched young and number of fledged young increased, and hatching date was advanced with increasing age. This was due to the fact that individuals increased in reproductive success as they grew older.5. A possibly higher probability of survival among individuals that perform well in reproduction could not explain the higher reproductive success in older age-classes as compared to young age-classes of geese, because there were no associations between survival and reproductive success, and very few individuals did actually disappear between any two breeding seasons.6. Path analysis suggested age effects only at earlier stages of reproduction, i. e. timing of breeding and clutch size. These characters, in turn, were associated with number of fledged young. These findings were further supported by measurements of hatching success and rearing success, which did not seem to increase with age.7. Increased breeding experience was associated with early hatching date and larger clutch size in males, and with larger clutch size in females. This was concluded from path analysis and from comparisons of individuals of the same age but with different breeding experience.8. The increase in reproductive success with age in the barnacle goose is probably a result of age-related skills in individuals and the direct effects of these skills on reproductive success, but possibly also because of increased reproductive effort with age owing to these age-related skills.