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PubMed1981

An analysis of feeding and sensorimotor abilities of rats after decortication.

Feeding and sensorimotor abilities of decorticate rats are described. Within 24 hr after surgery, the rats ate mash, unfamiliar foods, dry chow, and tap and sugar water from a spatula. They sampled nonnutritive substances but rejected noxious substances. Although initially anorectic, given mash, they arrested weight loss as early as 2 to 4 days. With training, they drank water from a spout by Day 10 and gained weight on dry food and water. Throughout survival they had difficulties with chewing food, lapping water, and trimming toenails. They showed sensorimotor neglect to objects touched to the body; they did not orient to the place in space where touched, they did not orient when touched on the head. There may be different types of orienting, one which is lost and one spared following decortication. When lifted from a surface, they showed limb and postural abnormalities; when dropped, righting responses were impaired. They showed stereotyped reflexive responses to surface and became trapped on platforms and in alleys. The range of abnormalities, from simple acts to more complex behaviors, considered within the context of feeding behavior in its broadest sense, shows the rats simplest environment. Furthermore, cortically controlled feeding seems partly independent from hypothalamically controlled feeding.

Animals↗
PubMed1998

Evidence for involvement of neuropeptide Y receptors in the regulation of food intake: studies with Y1-selective antagonist BIBP3226.

1. Experiments were conducted to evaluate the effects of the novel non-peptide neuropeptide Y Y1 receptor antagonist, BIBP3226 (N2-(diphenylacetyl)-N-[(4-hydroxy-phenyl)methyl]-D-arginine amide) on spontaneous, fasting-induced and NPY-induced food intake in rats. In addition to consumption of regular chow, the effects of BIBP3226 on consumption of highly palatable sweetened mash were monitored in a 1 h test on first exposure and after familiarization with novel food. 2. BIBP3226 (10.0 nmol, i.c.v.) had no effect on the consumption of regular chow, but reduced significantly the intake of highly palatable diet and the food intake stimulated by fasting (24 h). Neuropeptide Y (NPY, 1.0 nmol, i.c.v.) significantly increased the consumption of regular rat chow. This orexigenic effect of NPY was blocked by BIBP3226 (10.0 nmol, administered i.c.v. 5 min before NPY) at 30 min and 4 h, but not at 1 and 2 h. When animals were pretreated with diazepam (0.5 mg kg(-1), i.p., 20 min before NPY), BIBP3226 failed to suppress NPY-induced feeding. 3. An NPY Y1 and Y3 receptor agonist, [Leu31,Pro34]NPY and a Y5 receptor agonist human peptide YY3-36 (hPYY3-36, both 30 pmol), microinjected into the paraventricular nucleus of the hypothalamus (PVN) increased the consumption of regular rat chow. BIBP3226 (0.4 nmol, into the PVN) completely blocked the stimulatory effect of [Leu31,Pro34]NPY but not that of hPYY3-36. BIBP3226 (0.4 nmol) alone failed to modify the consumption of the regular chow. Higher doses of BIBP3226 (1.0 and 2.0 nmol) injected into the vicinity of the PVN reduced the consumption of the sweetened mash. 4. These results suggest that both the NPY Y1 and Y5 receptors in the PVN are involved in the regulation of food intake. The stimulatory effect of exogenous NPY is probably mediated through an NPY receptor subtype that is not identical with the Y1 receptor (possibly Y5 receptor). However, the NPY Y1 receptors may mediate the effect of endogenous NPY in conditions of increased energy demand or on intake of highly palatable diets.

Animals↗
PubMed2005

RFP represses transcriptional activation by bHLH transcription factors.

Basic helix-loop-helix (bHLH) transcription factors play a pivotal role in the regulation of tumorigenesis, and also in a wide range of other developmental processes in diverse species from yeast to humans. Here we demonstrate for the first time that Ret finger protein (RFP), a member of the TRIM family of proteins initially identified as a recombined transforming gene from a human lymphoma, is a novel interaction partner for four different bHLH proteins (SCL, E47, MyoD and mASH-1), but does not interact with GATA-1 or PU.1. Interaction with SCL required the B-box and first coiled-coil region of RFP together with the bHLH domain of SCL. RFP was able to repress transcriptional activation by E47, MyoD and mASH-1, but not by members of several other transcription factor families. Transcriptional repression by RFP was trichostatin A sensitive and did not involve an Id-like mechanism or ubiquitination with subsequent degradation of bHLH proteins. Instead, our results suggest that bHLH transcription factors are regulated by a previously undescribed interaction with RFP, which functions to recruit HDAC and/or Polycomb proteins and thus repress target genes of bHLH proteins. These results reveal an unexpected link between the bHLH and TRIM protein families.

Animals↗
PubMed1987

Duodenal and ileal lipid suppresses postprandial blood glucose and insulin responses in man: possible implications for the dietary management of diabetes mellitus.

Infusion of lipid into the ileum delays the transit of a meal through the stomach and small intestine and could therefore influence the rate and degree of nutrient absorption. Experiments were carried out on human volunteers to investigate the effect of infusion of lipid into either the duodenum or ileum on blood glucose, insulin and gastric emptying after ingestion of a mashed potato meal. Infusions of lipid into either the duodenum or the ileum significantly reduced or abolished the immediate postprandial rises in blood glucose and insulin and significantly delayed gastric emptying. Blood glucose and insulin rose shortly after the lipid infusion terminated. Addition of corn oil to a meal of mashed potato also reduced blood glucose and insulin and delayed gastric emptying. Intestinal lipid can thus modify the glycaemic and insulinaemic responses to a meal, and this modulation probably explains the reduced metabolic responses to a meal containing fat compared with a fat free meal. This principle could be of value in the dietary control of diabetes mellitus.

Adolescent↗
PubMed2004

Sensory testing of recipes masking peanut or hazelnut for double-blind placebo-controlled food challenges.

BACKGROUND: In a double-blind placebo-controlled food challenge (DBPCFC), it is necessary that recipes comprising the allergen cannot be distinguished from placebo. AIMS OF THE STUDY: We investigated whether the method of paired comparisons, a sensory difference test, could be used to test the suitability of recipes for a DBPCFC. METHODS: We used two recipes, each with three concentrations of peanut or hazelnut flour. The recipe for peanut consisted of mashed potatoes with 2.7, 8.9, or 26.8 mg of peanut flour, and the recipe for hazelnut of oatmeal porridge with 74, 247, or 742 mg of hazelnut flour. Corresponding amounts of protein in the provided 15 g portions of each recipe were 0.7, 2.3, and 6.8 mg for peanut, and 11.6, 39, and 117 mg for hazelnut, respectively. Recipes were offered together with a placebo, and evaluated on sensory features by 81 healthy volunteers. RESULTS: The sensory test was easy to perform. Volunteers were not able to detect peanut flour in mashed potatoes, but they recognized hazelnut flour in oatmeal porridge on visual features. CONCLUSIONS: Sensory testing by means of the method of paired comparisons is a useful method to evaluate masking of foods for DBPCFC.

Adult↗
PubMed1989

Effects of varying the carbohydrate:fat ratio in a hot lunch on postprandial variables in male volunteers.

1. Healthy male volunteers consumed at noon, hot test meals with four different carbohydrate:fat ratios varying between 2.64 and 0.50, and composed of fried beefsteak, mashed potatoes, French beans, and a dessert of custard with mashed peaches. The energy content of the meals was 40% of the daily intake of the volunteers, estimated from their individual dietary histories. 2. Before, and at different times after the start of the meal, blood samples were taken and a number of indices of carbohydrate and lipid metabolism were determined in the samples, i.e. glucose, insulin, free fatty acid, free and total glycerol, free and total cholesterol, high-density-lipoprotein (HDL)-cholesterol and low-density-lipoprotein (LDL)-cholesterol. 3. Increasing the carbohydrate:fat ratio resulted in higher postprandial peaks of glucose and insulin. In addition, the peak area under the postprandial glucose curve showed a significant increase. The peak area under the postprandial insulin curve had also increased, indicating that a larger amount of insulin was secreted by the pancreas on increasing the carbohydrate content in the meal. There was no significant correlation between the height of the postprandial peak of blood glucose and the size of the meal. 4. All four meals caused elevated postprandial blood triacylglycerol levels. However, the decline of this elevated level took a much longer time after the meals with the lower carbohydrate:fat ratios, i.e. containing larger amounts of triacylglycerols. There was a significant decreasing linear relation between the carbohydrate content of the meals and the peak area under the postprandial triacylglycerol curve. Free glycerol and free fatty acids showed lower postprandial levels in the blood after the meals with the higher carbohydrate:fat ratios, and the peak areas of the postprandial curves of both variables displayed a significant decrease. Little or no effect of the meal carbohydrate:fat ratio was observed on the postprandial concentrations of total cholesterol, unesterified cholesterol, HDL-cholesterol or LDL-cholesterol.

Adult↗
PubMed2002

Gizzerosine-induced histopathological lesions in broiler chicks.

1. The aim of this study was to investigate pathomorphological changes in broiler chicks fed with different doses of gizzerosine, a substance produced during the heat treatments of fish meal. 2. The experiment was carried out in Ross broiler chicks which were divided into three groups: group A received 100% of non-medicated commercial mash for broiler chicks. During an experimental 5-d period, 50% of commercial mash was replaced with unheated fish meal (0.65 ppm gizzerosine) in group B and in group C with heated fish meal (1.15 ppm gizzerosine). Fourteen chicks from each group were killed every day. Samples of gastrointestinal and lymphoid organs, lung, pancreas, liver, brain and kidney tissue were sampled for histopathological analysis. Organs were embedded in paraffin and stained with hematoxylin-eosin stain and using periodic acid-Schiff reagent (PAS) and Sudan III (frozen sections). 3. Necropsy did not reveal notable differences between treated groups. There were no significant histopathological changes in immunocompetent organs nor in the lungs, the pancreas, the kidney or the brain. Sharply demarcated multiple vacuoles were observed in the myocardium in group C toward the end of the experiment. In group C, the prevalent changes in the gizzard and the proventriculus were slight to severe cuticle erosions and oedema of the lamina propria with or without multiple vacuoles, respectively, towards the end of the experiment. The most prominent changes toward the end of the experiment were dispersed cell vacuolisation in duodenal, jejunual, ileal and caecal lamina propria in group C. 4. In conclusion, it should be emphasised that extra-gizzard gizzerosine-induced lesions are probably not mediated by H2-receptor stimulation, but could be a consequence of cellular hypoxia.

Animal Feed↗
PubMed2005

Recovery of duodenal villi and cells in chickens refed protein, carbohydrate and fat.

1. To clarify how histological recovery of villi and cells would be affected after refeeding single nutrients such as protein, carbohydrate and fat, male chickens were divided as follows: (1) intact control fed ad libitum a commercial finisher mash diet (CP, 140 g; ME, 11.71 MJ/kg, ALM), (2) 3 d feed withdrawal (FW), (3) FW followed by one day ad libitum free access to the mash diet (FW-ALM), and FW followed by one day force-feeding of (4) a commercial finisher pellet diet (FW-FFM) and an isocaloric diet of (5) a protein (FW-FFP), (6) a carbohydrate (FW-FFC) or (7) a fat (FW-FFF). 2. After refeeding, the formula diet groups increased in villus height and villus area and tended to increase in cell area and cell mitosis. Furthermore, flat cells on the villus tip in the F group developed to dome-shaped cells. This suggests that nutritionally well-balanced diets can induce histological recovery at villus and cellular levels. 3. Not all of the single nutrient groups recovered to the extent of the formula diet groups in all light microscopic variables after refeeding, suggesting that a single nutrient cannot induce histological recovery of the villus. 4. However, the dome-shaped cells were more distributed on the villus tip in these single nutrient groups than in the well-balanced formula diet groups, although cell diameter of the former groups was smaller than that of the latter. This suggests that the single nutrients would be effectively absorbed from cells and can induce histological recovery at the cellular level.

Animal Feed↗
PubMed2005

Effect of ochratoxin A on broiler chicks challenged with Salmonella gallinarum.

1. A study was conducted to evaluate the effects of ochratoxin A (OA) on broiler chicks challenged with Salmonella gallinarum. 2. One hundred and seventy-six 1-d-old broiler chicks were divided into two groups of 88 chicks each, with one group fed on a control mash diet and the other given a mash diet containing 2 ppm OA. On d 14, each group was further subdivided into two groups with one group infected with S. gallinarum and the other uninfected. 3. Following S. gallinarum inoculation on d 14, 4 birds from each group were killed at 1, 2, 3, 5, 7, 10, 14 and 21 d post inoculation. 4. S. gallinarum infection caused dullness, depression, weakness, increased thirst, droopy wings, ruffled feathers and greenish-yellow diarrhoea. S. gallinarum infection in the absence of OA caused 11.5% mortality which increased to 28.8% in the presence of OA. 5. Decreased body weight and reduced feed intake were observed in chicks fed on the diet containing OA. S. gallinarum infection also reduced the body weights of chicks, with the effects being more marked in chicks receiving OA. The OA diet led to increased serum levels of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, uric acid and creatinine, and decreased levels of total proteins, albumin, globulins, calcium and phosphorus. S. gallinarum infection did not cause significant alteration in any of the serum biochemical parameters. 6. Mortality and the severity of S. gallinarum infection in broiler chicks were increased by the presence of OA in the diet.

Alanine Transaminase↗
PubMed1983

The influence of fibre content and physical texture of the diet on the performance of broilers in the tropics.

Performance from 1 to 56 d and some aspects of gut morphology were examined in broilers fed on five nutritionally similar diets in mash or pellet form varying in acid-detergent fibre content from 50 to 100 g/kg. Dietary fibre and physical form did not significantly affect food consumption. Growth and food utilisation improved with pelleting and decreased with increasing fibre content. The interaction between fibre and physical form was also significant. At similar food intakes, high fibre contents increased relative length and weight of the intestine and caeca. Gizzards were heavier in broilers fed on four of the five mash diets.

Animals↗
PubMed1992

Prophylactic and therapeutic treatment of ascites in broiler chickens.

1. This work examined the effect of using three different feeding regimens in the prophylaxis and treatment of ascites in fastgrowing broilers stressed by exposure to cold (less than 10 degrees C), itself a potent inducer of ascites. 2. Broilers were exposed to cold in tiered cages in a semi-open poultry shed from the age of 24, 29 or 34 d and from day 35 they were given one of three types of food (pellets, pellets with high energy content, mash). Total mortality and mortality with ascites were recorded and erythrocyte packed cell volume (PCV) and relative weight of the right ventricle were measured (both reliable indices of ascites development). 3. Despite relatively low ambient temperatures and consequent high mortality from ascites, the mash diet was effective both in preventing ascites (prophylaxis) and in treating existing ascites.

Animal Feed↗
PubMed1992

Effects of different rates of drying cassava root on its toxicity to broiler chicks.

1. The effects of drying cassava root at different rates on its composition and toxicity to broiler chicks were examined. Unpeeled roots from a high-cyanide cultivar of cassava were chipped and dried at 25 degrees C to a moisture content of below 100 g/kg over 24 h for fast-dried meal (FD) or 72 h for slow-dried meal (SD). The meals were incorporated at 250 and 500 g/kg into semi-synthetic diets which were fed to day-old broiler chicks as mash or pellets in separate experiments. 2. The two drying rates produced meals with similar concentrations of polyphenols, but different concentrations of cyanogens, the latter being 38 and 482 mg total cyanide/kg for SD and FD, respectively. The linamarin, acetonecyanohydrin or total cyanide content measurements of pelleted diets were highly correlated. 3. Growth rates of chicks fed on SD-based diets were significantly higher than those of chicks fed on FD-based diets. Compared with a control diet, weight gain of chicks fed on the 500 g FD/kg diet (containing 258 mg total cyanide/kg) was 77% lower, although performance also appeared to be reduced at 142 mg total cyanide/kg. 4. The ratio of water:food intake of chicks was higher in FD than in SD groups, and this was reflected in the high water content of excreta. There was increased bile excretion, the chloretic effect increasing with the cyanogen content of diet. Pancreas weights were lower in FD than in SD groups in experiment 1 (mash diets), but not in experiment 2 (pelleted diets), while there was a significant interaction between drying method and cassava inclusion rate on liver weight in experiment 2, but not in experiment 1. There were no effects on the mortality rate. 5. Pelleting of diets generated high temperatures, but did not significantly alter the cyanogen concentration or the growth of the chicks. 6. Thus, slower rates of drying cassava roots produce meals with lower cyanogen concentration that are, consequently, less toxic to broiler chicks. Cassava root meal of less than 40 mg total cyanide/kg can be fed to broiler chicks at 500 g/kg without any adverse effects.

Animal Feed↗
PubMed1997

Behavioural development in groups of pen-housed pullets in relation to genetic strain, age and food form.

1. Behavioural development in groups of 8 pullets kept in pens with litter floors, and fed on either mash or pellets, was studied from 0 to 10 weeks in a White Leghorn x broiler (F2) hybrid line (experiment 1) and from 0 to 24 weeks in Hisex, White Leghorn and Brown Leghorn strains (experiment 2). The aim was to identify precursors of feather pecking and cannibalism. 2. Rates of body weight gain were consistently greater with pellets than with mash in both experiments. In experiment 2, the onset of lay was at 17 weeks of age in Hisex, 21 weeks in White Leghorns and 23 weeks in Brown Leghorns. 3. Persistent feather pecking, which was not seen in experiment 1, developed in 2 of 12 groups (one Hisex and one White Leghorn, both fed on pellets) in experiment 2, and was studied in detail at 23 and 24 weeks. The more damaging pecking in the Hisex group was followed by cannibalism in the same group. 4. Based on the (often inconsistent) effects of genetic strain, age and food form on behaviour that were observed, a working hypothesis was constructed to account for the aetiology of feather pecking and cannibalism in situations where there is floor litter. 5. An age-related decline in one or more foraging activities may coincide with increases in preening and non-damaging pecking at other birds. Consumption of litter particles and moulted feathers may be reinforcing. Dustbathing may enhance the stimulus value of litter particles when they are contrasted against background plumage colour. This may direct pecking towards the backs of birds, where feathers as well as litter particles may be removed and eaten. Regular pecking and feather removal may lead eventually, after the onset of lay, to vent pecking and cannibalism. This sequence of events may be more likely in groups where activity levels are high.

Aggression↗
PubMed1976

Inadequate saline selection by Mongolian gerbils fed a cation exchange resin in the diet.

Mongolian gerbils (42 male, 42 female) were tested for presence of a special hunger for minerals. Three groups were fed a mineral-free mash which contained a cation exchange resin and chelator. Three additional groups received the same mash but with a nonnutritive fiber in place of the resin and chelator. For 15 days, one group in each dietary plan was given ad libitum choice between a mineral solution and distilled water (DW). A second group in each arrangement drank only DW, and the third received just the mineral solution. All gerbils fed the fiber, as well as the animals given only the mineral solution while fed the exchanger, survived the period and showed nil or mild weight losses. In contrast, the two groups given either fluid choice or DW alone while receiving the exchanger survived the period in 43 percent and 29 percent of the cases, respectively; and the survivors exhibited marked decrements in body weight.

Animals↗
PubMedDate not supplied

Lead contamination during domestic preparation and cooking of potatoes and leaching of bone-derived lead on roasting, marinading and boiling beef.

Lead concentrations were measured in boiled, mashed potatoes and in baked potatoes that had been prepared and cooked in domestic kitchens. Levels of lead in the boiled, mashed potatoes ranged from below the 1 microgram/kg limit of detection up to 18 micrograms/kg with a mean of 6 micrograms/kg (wet weight). In the large majority of cases the lead in the tap water was the predominant source of the metal. Higher amounts of lead (range 11 micrograms/kg to 56 micrograms/kg, mean 27 micrograms/kg) were present in baked potatoes and this was attributed to soil adhering to the potato skin. The extent of leaching of lead from bone during cooking has also been investigated. For beef stocks there was little evidence to suggest that significant migration of bone lead occurred. For beef casseroles, marinaded in red wine, some leaching did occur from beef joints containing elevated amounts of bone lead; however the levels were all below 350 micrograms/kg and, on average, less than double that found in casseroles prepared from normal joints where the bone lead levels were an order of magnitude less.

Animals↗
PubMed2004

Pathological changes in broiler chickens fed ochratoxin A and inoculated with Escherichia coli.

A study was conducted to evaluate the effects of ochratoxin A (OA) on Escherichia coli-challenged broiler chickens. One hundred and eighty-four one-day-old broiler chicks were divided into two groups of 92 chicks each, with one group fed a control mash diet and the other fed a mash diet containing 2 parts/10(6) OA. On day 14, each group was further subdivided into two groups with one group inoculated with E. coli O78 (1 x 10(7) colony-forming units/0.5 ml) by the intraperitoneal route, whereas the other group was not inoculated with E. coli. Four birds from each group were sacrificed at 1, 2, 3, 5, 7, 10, 14 and 21 days post-inoculation to record pathological changes in the liver, kidneys, heart, lungs, bursa, spleen and thymus. E. coli infection induced perihepatitis and pericarditis in the liver and heart, respectively, in chickens infected with E. coli alone or in OA-fed birds from 1 day post-infection (DPI) onwards. At 1 DPI, a thin fibrin layer covered the liver and heart; however, at subsequent days, the layer became thicker. E. coli infection did not produce appreciable changes in the kidneys, bursa or thymus. However, there was congestion of the lungs along with mononuclear cell infiltration. Ochratoxin feeding induced changes from 10 DPI onwards in chicks fed OA alone and those infected with E. coli. The changes in kidneys included swollen proximal convoluted tubules, degeneration of tubular epithelium and interstitial nephritis. Degenerative changes and mononuclear cell infiltration were recorded in the liver. There was atrophy of the lymphoid organs along with depletion of lymphocytes. Gross and histopathological changes were more severe in chickens fed OA and inoculated with E. coli than the chickens fed OA alone or those infected with E. coli, indicating combined action of these two.

Animal Feed↗
PubMed2002

Loss of residual cyanogens in a cassava food during short-term storage.

Residual cyanogens in gari, the most popular cassava food in West Africa, is implicated in the causation of tropical ataxic neuropathy. Gari is eaten by soaking its granules in cold water or by adding boiling water to make a food called eba. This study was conducted to determine whether loss of the residual cyanogens in gari during short-term storage and when gari is made into eba will reduce dietary cyanide load in consumers. Fifteen samples of gari, nine roasted from cassava mash fermented for at least 4 days (type A) and six roasted from cassava mash fermented for only 1 day (type B), were stored for 4 weeks. Free cyanide, linamarin, and cyanohydrin in gari and in eba made from the gari were determined at weekly intervals for 4 weeks. Free cyanide was absent in all samples of gari. Mean cyanohydrin dropped from 8.4 mg HCN Eq/kg dry weight to 4.6 mg HCN Eq/kg dry weight in type A gari, while it dropped from 3.0 mg HCN Eq/kg dry weight to 1.3 mg HCN Eq/kg dry weight in type B gari. Mean linamarin dropped from 6.6 mg HCN Eq/kg dry weight to 2.8 mg HCN Eq/kg dry weight in type A gari, while it dropped from 1.7 mg HCN Eq/kg dry weight to 0.4 mg HCN Eq/kg dry weight in type B gari. Loss of linamarin and cyanohydrin was significant at P < 0.001 for type A gari and at P < 0.002 for type B gari when the weekly levels were compared with initial values. When gari was made into eba, 36% of cyanohydrin and 47% of linamarin were lost from type A gari, while 38% of cyanohydrin and 5% of linamarin were lost from type B gari. Loss of linamarin and cyanohydrin when gari was made into eba was significant for both types of gari at P < 0.001. This study shows that the loss of cyanohydrin and linamarin in gari during short-term storage and when gari is made to eba will reduce dietary cyanide load in consumers.

Cyanides↗
PubMed1993

Effect of feed-borne pollution with some mycotoxin combinations on broiler chicks.

Broiler chicks were divided into five groups and fed starter mash from the first day after hatching. The first group feed (control) was mycotoxin free, whereas the mycotoxins sterigmatocystin (350 ppb) and aflatoxin B1 (100 ppb) were added to the second group diet, patulin (100 ppb) and aflatoxin B1 (100 ppb) to the third group feed, penicillic acid (850 ppb) and aflatoxin B1 (100 ppb) to the fourth group, and aflatoxins B2a (0.9 ppb) +G2 alpha (25 ppb) +M1 (0.9 ppb) +M2 (1 ppb) to the fifth group. This contaminated feeding lasted for four weeks followed by another four weeks as recovery period during which all groups fed finishing mash without mycotoxins. At the end of the experiment, the chickens of groups two, three, four and five were significantly lower in body weight and feed conversion and reflected higher mortality rates than those of the control group.

Animal Feed↗