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1.
David R Bayne David Dunseth Cecilio García Ramirios 《Aquaculture (Amsterdam, Netherlands)》1976,7(2):133-146
A supplementary feed containing 30% coffee pulp was evaluated for use in the culture of Tilapia aurea in El Salvador, Central America. A comparison of the coffee pulp feed with a feed containing all of the same ingredients except coffee pulp was made with T. aurea raised in 1.0-m3 cages suspended in a fertilized earthen pond. Survival was high in all treatments and there was no significant difference in average weight gain between groups of fish receiving the two experimental feeds. Production trials were conducted in 100-m2 fish pens and in 0.05-ha earthen ponds. Pen-raised fish receiving coffee pulp feed grew faster throughout the experiment, and total production was approximately twice that in control treatments. Highest production in pens was 1.25 kg/m2 per year. Results of production pond trials using T. aurea at 9 000/ha and stocked with the piscivorous Cichlasoma managuense yielded an estimated 3 392 kg/ha per year in fed treatments and 2 049 kg/ha per year in controls. Low feed conversion (1.92) and low feed cost resulted in an increase in net annual earnings of $251.00/ha. 相似文献
2.
Three types of raised perforated floor were compared with floor-level concrete which had perforated flooring at the rear. Piglets on raised perforated floors grew faster (P less than 0.05) to 21 days than pigs on mainly solid floors (205 g/day and 198 g/day, respectively). The mortality in the first 21 days of all pigs born did not differ between raised (18.4 per cent) and mainly solid floors (18.7 per cent) and there were no effects of individual floor types on overall survival or on deaths due to crushing. The incidence of diarrhoea was not significantly less on raised than on solid floors (27 per cent and 34 per cent of litters, respectively) but antibiotic treatment time was shortened (0.9 days and 1.2 days, P less than 0.05). The incidence of splayleg was highest on fibreglass slats. Concrete floors caused most knee abrasions but the incidence of arthritis was unaffected. Approximately twice as many sows on mainly solid floors went off their feed or had a high rectal temperature compared with sows on raised perforated floors. No differences were observed between narrow or A-frame farrowing crates. 相似文献
3.
Pronephric leucocytes of Cyprinus carpio: isolation, separation and characterization 总被引：5，自引：0，他引：5
C J Bayne 《Veterinary immunology and immunopathology》1986,12(1-4):141-151
Since the teleost pronephros is an important source of diverse immunocytes, suspensions of pronephric cells from young adult carp have been characterized. In freshly prepared suspensions, adherent, spreading cells (macrophages?) constituted less than 3% of the total population. Granulocytes and lymphocytes were co-dominant (less than 80%) leucocyte types. Continuous Percoll density gradient centrifugation yielded discrete subpopulations with these rho values and cytological characteristics: Fraction I & II rho = 1.055-1.070 thrombocytes, monocytes, macrophages, and lymphocytes. Fraction III rho = 1.080-1.090 granulocytes, type 1. Fraction IV rho = 1.105-1.110 erythrocytes and granulocytes, type 2. Fraction V rho = 1.118-1.125 granulocytes, type 3. Fraction VI rho = 1.140-1.150 granulocytes, type 4. Granulocyte motility increased markedly over the first 24 hr in vitro, and was enhanced by components washed from intact yeast. The subtypes of granulocytes were distinguishable by not only the rho values, but also on the basis of cell size, ultra-structure of the granules, and their histochemical and phagocytic characteristics. After simultaneous in vivo injection of Bacillus megaterium (Gram + ve), Aeromonas hydrophila (Gram - ve) and Saccharomyces cerevisiae (yeast), individual pronephric leucocytes were found capable of phagocytosing all three types of particle. Granulocytes which had phagocytosed B. megaterium were slower than macrophages in their ability to kill the bacteria. Encounter with B. megaterium or S. cerevisiae in vitro elicited a clumping reaction which involved mostly the larger leucocytes [granulocytes]. Both adherent cells and non-adherent cells were phagocytic in vitro. 相似文献
4.
Michel P. Laforge Ryan K. Brook Floris M. van Beest Erin M. Bayne Philip D. McLoughlin 《Landscape Ecology》2016,31(4):855-863
Context
Spatial scale is an important consideration for understanding how animals select habitat, and multi-scalar designs in resource selection studies have become increasingly common. Despite this, examination of functional responses in habitat selection at multiple scales is rare. The perceptual range of an animal changes as a function of vegetation association, suggesting that use, selection and functional responses may all be habitat- and scale-dependent.Objectives
Our objective was to determine how varying grain size affects our interpretation of functional response in habitat selection and to elucidate scalar and landscape effects on habitat selection.Methods
We quantified the functional response of GPS-collared, female white-tailed deer (Odocoileus virginianus, n = 18) in Riding Mountain National Park, Canada, to different habitat types. Functional responses were quantified at multiple spatial scales by regressing proportion of habitat used against proportion of habitat available at different buffer radii (ranging from 75–1000 m radius) surrounding used (telemetry) locations and available points within the individual’s seasonal home range. We examined how functional responses changed as a function of grain by plotting grain size against the slope of the functional response.Results
We detected functional responses in most habitat types. As expected, functional responses tended to converge towards 1 (use proportional to availability) at large buffer sizes; however, the relationship between scale and functional response was typically non-linear and depended on habitat type.Conclusions
We conclude that a multi-scalar approach to modelling animal functional responses in habitat selection is important for understanding patterns in animal behaviour and resource use.5.
6.
Jennifer H. Koziol Misty A. Edmondson Dwight F. Wolfe Jenna E. Bayne 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(7):753-755
A 2-year-old intact male alpaca was presented for a post-breeding preputial prolapse of 5 days duration. The internal lamina of the prepuce was prolapsed approximately 6 cm and the exposed preputial epithelium was edematous and necrotic. Following 7 days of medical treatment, resolution of the preputial prolapse was achieved. 相似文献
7.
Landscape Ecology - Movement is one of the proposed explanations for the scale at which a species responds most strongly to its environment, or the “scale of effect”. Scarcity of... 相似文献
8.
Manuel F. Chamorro Thomas Passler Kellye Joiner Robert H. Poppenga Jenna Bayne Paul H. Walz 《The Canadian veterinary journal. La revue veterinaire canadienne》2013,54(1):61-64
Two adult llamas (Lama glama) previously exposed to oak trees (Quercus spp.) were presented with a history of depression and anorexia. Clinicopathological abnormalities included severe gastroenteritis, acute renal failure, and increased liver enzymes. This is believed to be the first report of oak toxicosis in South American camelids. 相似文献
9.
Gina M. Lo Ciudice David R. Bayne Thomas J. Popma 《Journal of the World Aquaculture Society》2004,35(3):345-356
Threadfin shad Dorosoma petenense are often stocked into commercial catfish ponds for biological control of algae. It is thought that the fish will alter the phytoplankton community, improve water quality, and enhance channel catfish production. Co-stocking of shad and catfish is a common practice, although there is limited information regarding the effects of threadfin shad on pond dynamics and catfish production. To evaluate the influence of shad in catfish ponds, this study was conducted in ten 0.04-ha experimental earthen ponds near Auburn, Alabama. All ponds were stocked in April with 600 fingerling channel catfish Ictal-urus punctatus (13,200/ha) with a mean length of 10.4 cm (4.1 in). Additionally, five of these ponds were randomly chosen and stocked with 70 adult threadfin shad (1,750/ha) weighing a total of 3.3 kg (16.5 kg/ha). At harvest in November, an average of 1,284 threadfin shad (32,100/ha), weighing a total of 55 kg (1,375 kg/ha) were collected from each shad pond. Water quality was improved with the addition of threadfin shad to channel catfish ponds. Mean total ammonia-nitrogen was significantly lower and less variable in the shad treatment. Observed mean nitrite concentrations, though not significant, were lower in the shad treatment. The phytoplankton community of the shad treatment had significantly higher density, more taxa, and smaller organisms. Pond water in the shad treatment had higher projected early morning dissolved oxygen levels requiring less aeration. Channel catfish had significantly higher survival in the shad treatment, furthermore, though not statistically significant, observed mean fish production was higher and feed conversion ratio was lower than in the no-shad treatment. 相似文献
10.
S.E. Nielsen E.M. Bayne J. Schieck J. Herbers S. Boutin 《Biological conservation》2007,137(3):403-414
Critical to the conservation of biodiversity is knowledge of status and trends of species. To that end, monitoring programmes have reported on the state of biodiversity using reference conditions as comparison. Little consensus exists on how reference conditions are defined and how such information is used to index intactness. Most use protected areas or an arbitrary year as reference. This is problematic since protected areas are often spatially biased, while arbitrarily defined reference years are often not sufficiently distant in time. We propose an alternative that relies on empirical estimates of reference conditions. Statistical ranges of reference are estimated and compared with observed occurrence and abundance to index status of individual species. When averaged among species, overall intactness is estimated. We demonstrate the approach using 202-winter mammal tracking sites from the boreal forest of Alberta, Canada. Intactness was estimated at 89 out of 100 with the southern boreal having lowest intactness and greatest human footprint. We suggest empirical predictions of reference conditions be used as baselines for comparing changes in the state of species and biodiversity. Reporting can occur at any spatial (e.g., ecosystem) or hierarchical (e.g., species, guilds, taxonomic group, or overall biodiversity) scale and is easily interpreted (scaled from 0-degraded to 100-intact). When used in a long-term monitoring framework, statistical trends in biodiversity intactness can be estimated, individual status of species assessed, and relevant policy evaluated. 相似文献