Reduction of Food Intake and Other Physiological Responses to a Restriction of Drinking Water in Captive Wild Rabbits, Oryctolagus Cuniculus (L.).

1982 ◽  
Vol 9 (2) ◽  
pp. 247 ◽  
Author(s):  
BD Cooke
Keyword(s):  
Drinking Water ◽  
Food Intake ◽  
Oryctolagus Cuniculus ◽  
Physiological Responses ◽  
Water Shortage ◽  
Gut Contents ◽  
Perennial Vegetation ◽  
Drought Resistant ◽  
Dry Food ◽  
Response To Water

Rabbits given an excess of air-dry food but only small amounts of drinking water had a lower food intake and lost more weight than those given food and water freely. They lost weight because they had less digesta in the gut and less water in the skin, and had catabolized more tissue. Their response to water shortage was similar to that seen in other grazing mammals. With low food intake, gut contents fell and the digestibility of food rose, while the daily mass of and water loss in faeces fell; the moisture content in faeces remaining the same. Dehydrated rabbits produced relatively small amounts of urine, up to 1.9 M urea, which was twice as concentrated as that of rabbits given water freely. The rabbits were not able to reduce their requirement for water to less than 55% of their total intake of food and water. As pasture species in mediterranean-type environments become relatively dry in summer and contain only 10 to 5% water, a shortage of water in natural pastures in those areas may, therefore, limit the amount of food which rabbits can use, and the ability of rabbits to survive in summer would, therefore, depend upon the availability of succulent, drought-resistant perennial vegetation.

scholarly journals High Nitrogen Fertilization Modulates Morpho-Physiological Responses, Yield, and Water Productivity of Lowland Rice under Deficit Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1291
Author(s):  
Nasr M. Abdou ◽  
Mohamed A. Abdel-Razek ◽  
Shimaa A. Abd El-Mageed ◽  
Wael M. Semida ◽  
Ahmed A. A. Leilah ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Irrigation Water ◽  
Nitrogen Fertilization ◽  
Deficit Irrigation ◽  
Physiological Responses ◽  
Water Productivity ◽  
Water Shortage ◽  
Rice Production ◽  
Lowland Rice ◽  
Nitrogen Fertilizers

Sustainability of rice production under flooding conditions has been challenged by water shortage and food demand. Applying higher nitrogen fertilization could be a practical solution to alleviate the deleterious effects of water stress on lowland rice (Oryza sativa L.) in semi-arid conditions. For this purpose, field experiments were conducted during the summer of 2017 and 2018 seasons. These trials were conducted as split-split based on randomized complete blocks design with soil moisture regimes at three levels (120, 100 and 80% of crop evapotranspiration (ETc), nitrogen fertilizers at two levels (N1—165 and N2—200 kg N ha−1) and three lowland Egyptian rice varieties [V1 (Giza178), V2 (Giza177) and V3 (Sakha104)] using three replications. For all varieties, growth (plant height, tillers No, effective tillers no), water status ((relative water content RWC, and membrane stability index, MSI), physiological responses (chlorophyll fluorescence, Relative chlorophyll content (SPAD), and yield were significantly increased with higher addition of nitrogen fertilizer under all water regimes. Variety V1 produced the highest grain yield compared to other varieties and the increases were 38% and 15% compared with V2 and V3, respectively. Increasing nitrogen up to 200 kg N ha−1 (N2) resulted in an increase in grain and straw yields by 12.7 and 18.2%, respectively, compared with N1. The highest irrigation water productivity (IWP) was recorded under I2 (0.89 kg m−3) compared to (0.83 kg m−3) and (0.82 kg m−3) for I1 and I3, respectively. Therefore, the new applied agro-management practice (deficit irrigation and higher nitrogen fertilizer) effectively saved irrigation water input by 50–60% when compared with the traditional cultivation method (flooding system). Hence, the new proposed innovative method for rice cultivation could be a promising strategy for enhancing the sustainability of rice production under water shortage conditions.

scholarly journals Reduction of Microbial Contamination in Drinking Water using Flocculant Settling

2012 ◽  
Vol 8 ◽  
pp. 34-37
Author(s):  
Arshad Ali ◽  
Hashim Nissar Hasim ◽  
Ashfaq Ahmad ◽  
Intikhab Ahmad Qureashi
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Microbial Contamination ◽  
Industrial Effluent ◽  
Cost Effective ◽  
Water Shortage ◽  
Treatment Technique ◽  
Reliable Technique ◽  
Energy And Environment ◽  
Cost Effective Treatment

Pakistan is subjected to rapid water shortage due to different social and environmental problems. Moreover, the drinking water is being contaminated at an alarming rate that is mostly due to the discharge of untreated domestic and industrial effluent and agricultural run-off. Therefore, this study was designed to evaluate the water quality problems of the subject area and to determine a cost effective treatment technique. The main objective was to determine the removal efficiency of microbial contamination using flocculant settling. The main pollutants identified by conducting water quality tests are arsenic, fluoride, nitrates and microbial contamination. The maximum concentration of arsenic, fluoride, nitrates and microbial contamination were observed as 12ppb, 2.2mg/L, 26mg/L and 84 colonies/100mL, respectively. During discrete settling tests performed in a 12cft column, it was noticed that the removal of microbial contamination corresponding to a detention time of 225min is 26.7% only. While working on different coagulants, it was observed that the optimum alum, lime and magnesium dosage for the removal of microbial contamination is 31.5mg/L, 10.5mg/L and 27mg/L respectively. The final results of the study suggest that the use of lime as a coagulant to improve the quality of water in terms of microbial contamination is an effective and reliable technique, both in terms of its treatability performance and cost-effectiveness, which was noticed to be 77.7%.DOI: http://dx.doi.org/10.3126/hn.v8i0.4909Hydro Nepal: Journal of Water, Energy and Environment Issue No. 8, 2011 JanuaryPage: 34-37Uploaded date: 17 June, 2011

Metering of fluid intake and determinants of ad libitum drinking in rats

1976 ◽  
Vol 231 (1) ◽  
pp. 1-8 ◽  
Author(s):  
N Rowland ◽  
S Nicolaidis
Keyword(s):  
Food Intake ◽  
Fluid Intake ◽  
Base Line ◽  
Marked Contrast ◽  
Routes Of Administration ◽  
Spontaneous Drinking ◽  
Ad Libitum ◽  
Dry Food ◽  
Water Administration ◽  
Different Levels

The contributions of homeostatis mechanisms to spontaneous drinking were assessed in a study of residual oral drinking under several conditions of exogenous water administration. Continuous and/or discontinuous infusiors were conducted for long periods with dry food present ad libitum. The routes of administration were intravenous (IV), intragastric (IG) through a nasopharyngeal catheter. All infusions reduced from noninfused levels, but the magnitude of that reduction was a function of both route and temporal characteristics. Continuous infusions were more effective via the IG route than IV, and a residual intake of about 10 ml/24 h presisted at even the highest infusion rates. Discontinuous meal-paired IV infusions suppressed mid- and postmeal drinking, consistent with the satisfaction of systemic needs induced by cry food intake. Meal-paired IG nasopharyngeal infusions competely suppressed drinking when the infusions exceeded base-line intake by only about 20%. In marked contrast, corresponding IG infusions through a direct fistula catheter were relatively ineffective. In all cases the decreases in drinking were not of a nonspecific nature beacuse food intake was unchanged. The discussion considers the different levels of metering involved and the time-varying (derivative) nature of the infusion if was suggested that there is a nonhomeostatic contribution to normal drinking.

Physiological responses of rats to primary infection with Nippostrongylus brasiliensis

1986 ◽  
Vol 60 (4) ◽  
pp. 307-312 ◽  
Author(s):  
K. S. Ovington
Keyword(s):  
Food Intake ◽  
Primary Infection ◽  
Physiological Responses ◽  
Host Responses ◽  
Nippostrongylus Brasiliensis ◽  
Intestinal Nematode ◽  
Microbial Infections ◽  
Rate Of Oxygen Consumption ◽  
Muscle Catabolism ◽  
Ad Libitum

ABSTRACTThe physiological responses of well-nourished rats to primary infection with the intestinal nematode Nippostrongylus brasiliensis were examined. Infected rats fed ad libitum were compared with uninfected control rats fed ad lib. and also with uninfected rats which were pair-fed to the infected rats. Following infection with N. brasiliensis rat food intake was reduced from day 2 post infection (pi) and there were two periods of minimal food intake (day 2 to 3 and 8 to 9 pi). The water intake of infected rats was only reduced on days 2, 3 and 9 pi and not to the same extent as food intake. Muscle catabolism in infected rats was more severe than could be explained on the basis of their food intake reduction. The rectal temperature and rate of oxygen consumption per g body-weight of rats was not significantly altered by the infection. Host responses to N. brasiliensis are compared with those seen in microbial infections and some of them are found to be considerably different.

Dehydration tolerance in Awassi fat-tailed sheep

1987 ◽  
Vol 65 (2) ◽  
pp. 363-367 ◽  
Author(s):  
S. Laden ◽  
L. Nehmadi ◽  
R. Yagil
Keyword(s):  
Drinking Water ◽  
Food Intake ◽  
Water Conservation ◽  
Water Deprivation ◽  
The Other ◽  
Water Restriction ◽  
Urine Excretion ◽  
Water Losses ◽  
Awassi Sheep ◽  
Active Substances

Young Awassi sheep were subjected to 5-d periods of complete water restriction in metabolic cages. During water deprivation there were steady declines in food intake and faeces and urine excretion. The blood haematocrit and urine and plasma osmolalities increased. There was a decline in blood and faecal water. As dehydration progressed, urinary excretion of osmotically active substances was greatly reduced. When drinking water was presented following 5 d of restriction it took 24 h to replace water losses and for urine to be excreted. Faecal water did not return to normal within 24 h. The sheep were as capable of withstanding dehydration as the other small desert ruminants that are mentioned in the literature. The dehydrated sheep relied on faecal and renal water conservation to survive. The sheep are not rapid replenishers of water losses, nor are they rapid reabsorbers of water, making their stay at water holes longer than that of goats.

scholarly journals Assessment of Drinking Water Catchments in Fako Division, South West Region, Cameroon

2019 ◽  
pp. 1-9
Author(s):  
Malika Esembeson ◽  
Rene Nkenyi ◽  
Ndefon Peter ◽  
Kamgno Joseph ◽  
Njunda Anna Longdoh
Keyword(s):  
Drinking Water ◽  
Anthropogenic Activities ◽  
Water Shortage ◽  
Water Volume ◽  
Catchment Management ◽  
Waterborne Diseases ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Qualitative Approaches ◽  
Water Catchments

Background: Without readily available water in sufficient quantity, and pathogen-free, man's progress is hindered. Globally, 2 billion people use sources of drinking water that are faecally contaminated and not appropriate for consumption. In Cameroon and specifically in fako division, due to acute piped drinking water shortage, the population uses alternative sources (springs and boreholes). Waterborne diseases are the second and third leading weekly epidemiological disease under surveillance in Fako. To find out some predisposing factors of waterborne diseases in Fako , and  to meet up with Sustainable Development Goal (SDG): 6.1, by 2030, we sort to start with an assessment of the drinking water catchments in Fako, as we found paucity of studies. Methods: A community-based cross-sectional survey was conducted from January to May 2018 using quantitative and qualitative approaches. An adapted WHO checklist was used for observations around catchment, then a risk assessment was done with a semi quantitative approach. Qualitative data was collected through   Focus Group Discussions and In-depth interviews. Results: Of the 15 water catchments assessed, none of them met all WHO recommendations. We found that 60% have anthropogenic activities at less than 100meters from the catchments with progressive reduction in water volume and risk of contamination. Meanwhile 20% were open springs and consumers fetch water with feet and container deepen in source, while 13.3% were surface water. There was no integrated catchment management with stakeholders in Fako Division. Conclusion:  None of the catchments met WHO recommendations. An integrated drinking water management team and a periodic monitoring of these catchments is imperative.

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