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Registros recuperados: 15
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A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson's Hawk (Buteo swainsoni) Hornero
Bechard,Marc J.; Sarasola,Jose H.; Woodbridge,Brian.
We examined the fasting migration hypothesis for Swainson's Hawks (Buteo swainsoni) by estimating the length, duration, and speed of the migration between North and South America and measuring changes in their body masses at various times throughout the year. We instrumented 34 adult Swainson's Hawks with satellite radios on their breeding grounds in western North America to determine the duration, length, and speed of the migration. Migrating south at 188 km/day, it took Swainson's Hawks 51 days to complete their 13504 km migration to their austral summer grounds. Averaging only 150 km/day on their return migration, it took them 60 days to complete the shorter 11952 km migration back to North America. Adult male and female Swainson's Hawks had average...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body mass; Buteo swainsoni; Fasting; Migration; Swainson's Hawk.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0073-34072006000200002
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Bacteriological investigation of microorganisms (Salmonella sp. and other Enterobacteriaceae) in common quails (Coturnix coturnix) submitted to different forced-molting procedures Rev. Bras. Ciênc. Avic.
Teixeira,RSC; Cardoso,WM; Lopes,ES; Rocha-e-Silva,RC; Albuquerque,AH; Horn,RV; Salles,RPR.
The aim of this study was to investigate the presence of Salmonella in common quails submitted to forced molting. A total of 240 quails were divided at 40 weeks of age into four groups: CG (control, quails not submitted to molting); FM (fasting method); WM (fed wheat midds ad libitum); and ZM (zinc oxide method). From each group, 10 cloacal swabs, 10 fecal samples, and 20 egg samples were collected before molting (two weeks) and after molting (two weeks). The microbiological procedures for Salmonella spp. identification were performed in four steps. The agglutination test, using somatic and flagellar antigens, was used to confirm Salmonella-suspected colonies. According to the methodology applied, none of the samples was positive for Salmonella spp. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eggs; Forced molting; Zinc oxide; Fasting; Wheat midds diet.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000100008
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Energetic adjustments in freely breeding-fasting king penguins: does colony density matter? ArchiMer
Viblanc, Vincent A.; Saraux, Claire; Malosse, Nelly; Groscolas, Rene.
1. For seabirds that forage at sea but breed while fasting on land, successful reproduction depends on the effective management of energy stores. Additionally, breeding often means aggregating in dense colonies where social stress may affect energy budgets. 2. Male king penguins (Aptenodytes patagonicus) fast for remarkably long periods (up to 1 center dot 5months) while courting and incubating ashore. Although their fasting capacities have been well investigated in captivity, we still know very little about the energetics of freely breeding birds. 3. We monitored heart rate (HR, a proxy to energy expenditure), body temperature and physical activity of male king penguins during their courtship and first incubation shift in a colony of some 24000 freely...
Tipo: Text Palavras-chave: Social density; Body temperature; Seabird; Fasting; Stress; Physical activity; Heart rate; Energy expenditure.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00193/30447/29090.pdf
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Extracellular breakdown of collagen by mice decidual cells. A cytochemical and ultrastructural study Biocell
Godosevicius Katz,Sima.
The interaction of antimesometrial decidual cells and collagen fibrils was studied by light microscopy and ultrastructural cytochemistry in fed and acutely fasted mice on days 9-11 of pregnancy. Fibrillar elements in the extracellular space consisted of collagen fibrils and filamentous aggregates (disintegrating collagen fibrils). Intracellular vacuoles exhibited typical collagen immersed in electron-translucent material (clear vacuoles) and faint cross-banded collagen immersed in electron-opaque material (dark vacuoles). Fibrillar elements showed extracellular acid phosphatase activity which was stronger in the region of mature decidua than in predecidual cells region in all animals; it was conspicuous in mature decidua of fasted animals. Intracellular...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Decidua; Acid phosphatase; Fasting; Electron microscopy; Mice.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452005000300003
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Feeding programs to induce molting in Japanese quails (Coturnix japonica) Rev. Bras. Ciênc. Avic.
Faitarone,ABG; Garcia,EA; Pizzolante,CC; Molino,AB; Pelícia,K; Berto,DA.
The experiment was carried out in the experimental poultry house of the Research and Development Unit of Brotas of Agência Paulista de Tecnologia dos Agronegócios do Centro-Oeste, SP, Brazil. The objective of the study was to evaluate forced-molting methods and their effects on body weight, egg production, feed intake, and mortality, as well as bird performance during the second laying cycle. A total number of 400 65-week-old Japanese quails was distributed in a completely randomized experimental design into five treatments, with four replicates of 20 birds each. The following treatments were applied: T1= not submitted to forced molting, T2= 01 day of fasting + 13 days receiving 15g feed/bird/day (1F+R), T3= 02 days of fasting + 12 days receiving 15g...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body weight; Coturnix japonica; Egg production; Fasting.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000100002
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Hematological profile of beef cattle with divergent residual feed intake, following feed deprivation PAB
Gomes,Rodrigo da Costa; Siqueira,Renata Farinelli de; Ballou,Michael Alan; Stella,Tiago Roberto; Leme,Paulo Roberto.
The objective of this work was to characterize the hematological profiles of steers and bulls, according to residual feed intake (RFI), after feed deprivation. Twenty‑month‑old Nellore steers and bulls were fed feedlot diets for 70 and 56 days, respectively. RFI was calculated as the difference between actual feed intake and expected feed intake. More and less efficient steers and bulls, according to RFI, were subjected to 24 hours of food deprivation. Blood was sampled prior to and following the withdrawal period. Hematological analyses included total and differential white blood cell count, red blood cell count and morphology, and plasma glucose concentration. Variation in RFI did not influence plasma glucose concentration or blood cell profiles. Glucose...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bos indicus; Fasting; Feed efficiency; Leukocytes; Stress.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000900019
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Jejum e micção forcada em ovelhas submetidas a laparoscopia. Repositório Alice
MACHADO, R.; SIMPLICIO, A. A..
Resumo.
Tipo: Parte de livro Palavras-chave: Micção forçada Ovino; Ovelha; Dieta; Laparoscopia Goats; Fasting; Urination; Laparoscopy.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/913014
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Meal-feeding scheme: twenty years of research in Brazil BJMBR
Bazotte,R.B.; Batista,M.R.; Curi,R..
Naomi Shinomiya Hell was the first researcher to investigate the physiological adaptations to a meal-feeding scheme (MFS) in Brazil. Over a period of 20 years, from 1979 to 1999, Naomi's group determined the physiological and metabolic adaptations induced by this feeding scheme in rats. The group showed the persistence of such adaptations even when MFS is associated with moderate exercise training and the performance to a session of intense physical effort. The metabolic changes induced by the feeding training were discriminated from those caused by the effective fasting period. Naomi made an important contribution to the understanding of the MFS but a lot still has to be done. One crucial question still remains to be satisfactorily answered: what is the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Meal-feeding scheme; Metabolism; Exercise; Fasting; Liver.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000900001
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Metabolism of broilers subjected to different lairage times at the abattoir and its relationship with broiler meat quality Arq. Bras. Med. Vet. Zootec.
Rodrigues,D.R.; Café,M.B.; Jardim Filho,R.M.; Oliveira,E.; Trentin,T.C.; Martins,D.B.; Minafra,C.S..
ABSTRACT An investigation was made into the effects of different lairage times and the position of chicken crates during transport to the slaughterhouse on the biochemical and hematological profile and physical parameters of broilers, such as color and pH of their breast meat. The treatments were defined by the animals slaughtered after 0, 2, 4 and 6 hours of lairage time at the slaughterhouse, transported in crates located in the top and bottom layers of the truck. It was found that increasing the lairage time at the slaughterhouse to over two hours reduced the number of lymphocytes and increased the heterophil/lymphocyte (H/L) ratio and the basophil count in the hemogram. In addition, lactate dehydrogenase (LDH) activity and cholesterol levels increased...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal welfare; DFD meat; Fasting; Holding sheds; Pre-slaughter.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000300733
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Morphological changes of the intestinal mucosa of broilers and layers as affected by fasting before sample collection Rev. Bras. Ciênc. Avic.
Zavarize,KC; Sartori,JR; Gonzales,E; Pezzato,AC.
The present study aimed at evaluating the histo-morphological changes resulting from different fasting periods before the collection of tissue samples in different segments of the small intestine (duodenum, jejunum and ileum) of 7-d-old male chicks of a broiler and a layer strain. A completely randomized experimental design in in a 2x7 factorial arrangement, being two strains with different growth rates (Ross 308 and HyLine® W36) and seven fasting periods (0, 2, 4, 6, 8, 10 and 12 hours ), with six replicates, totaling 84 birds. The comparison of the morphometrics of the duodenum, jejunum and ileum of broiler and layer chicks demonstrated faster digestive tract development in broilers relative to layers. The fasting period caused morphological changes in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fasting; Intestine; Morphology; Organs; Strain.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000100004
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Productive consequences of fasting neonatal chicks of different genetic constitutions for growing Rev. Bras. Ciênc. Avic.
Gonzales,E; Stringhini,JH; Dahlke,F; Cunha,WCP; Xavier,SAG.
The study was designed to evaluate the productive consequences of fasting neonatal chicks obtained from strains genetically divergent for growing. Four hundred eight chicks from three strains, 160 from breeders selected for high growth rate and excellent feed conversion ratio (Cobb 500), 160 from breeders not selected for fast growth (JA57), and 160 from a white egg layer strain (Hy-Line W98) were allotted in a 3 (strain) x 2 (fasting period - 8 and 36h after hatching) factorial arrangement with 5 replicates of 16 chicks each. Immediately after hatching, all chicks had similar (P>0.05) relative yolk sac weights (14.13%, 14.50%, and 15.49% for Hy-Line, Cobb, and JA57, respectively). The yolk sac retractions were proportionally higher for Cobb and JA57...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chicks; Fasting; Neonatal; Performance; Yolk sac.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000400010
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Sex-specific compensatory growth in food-deprived Nile tilapia BJMBR
Barreto,R.E.; Moreira,P.S.A.; Carvalho,R.F..
Female Nile tilapia incubate fertilized eggs in their mouth until they are released as alevins. Consequently, the female may not eat during this period. Thus, it would be expected that female Nile tilapia are more adapted to recovering from fasting than males, which do not display this behavior. To test this hypothesis we conducted an experiment with two groups of fish consisting of 7 males and 7 females each, with one fish per aquarium. The experiment was divided into three phases involving adjustment of the animals to experimental aquaria (0-15th day), fasting (16th-27th day), and refeeding (27th-42nd day). Compensatory growth performance was assessed by specific growth rate, weight, food conversion efficiency and food intake. Food conversion efficiency...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compensatory growth; Fasting; Sex-related growth; Mouthbrooding fish; Nile tilapia; Oreochromis niloticus.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000400009
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Study of methodological variations in apparent nutrient metabolism determination in broiler chickens R. Bras. Zootec.
Cortés,María Esperanza Mayorga; Ribeiro,Andréa Machado Leal; Gianfelici,Mário Federico; Kessler,Alexandre de Mello; Moraes,Mariana Lemos de.
An experiment was conducted to define a protocol to determine metabolizable nutrient and energy values of diets. The metabolizability (M) was calculated of the dry matter (DM); crude protein (CP); gross energy (GE) and AMEn of a single diet. Eighty-one 21-day old (d) male birds were used. The tested methodologies were: Cr2O3 (0.5%) as an indicator (partial collection) or Fe2O3 (1%) as a marker; fasting (0, 4, 6 and 8 h) prior to excreta collection and at the end of the feeding period on the last day of collection (total collection). The excreta collection periods were also tested (3 and 5 days). Twenty 31-day old male broilers from the same group of birds were used to assess the effect of fasting on digestive organ weight. At the end of fasting the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromic oxide; Excreta collection; Fasting; Ferric oxide; Metabolizable energy organ size.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001000010
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The influence of fasting/refeeding on the lipoprotein lipase activity of adipose tissue and muscle BJMBR
Botion,L.M..
Lipoprotein lipase activity in adipose tissue and muscle is modulated by changes in the pattern of food intake. We have measured total lipoprotein lipase activity in adipose tissue and muscle of male Wistar rats (N = 6-10), weighing 200-250 g (~12 weeks), during the refeeding/fasting state following 24 h of fasting. Lipoprotein lipase activity in tissue homogenates was evaluated using a [³H]-triolein-containing substrate, and released [³H]-free fatty acids were extracted and quantified by liquid scintillation. Adipose tissue lipoprotein lipase activity did not completely recover within 2 h of refeeding (60% of refed ad libitum values). Cardiac lipoprotein lipase activity remained increased even 2 h after refeeding (100% of refed ad libitum values), whereas...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Cardiac lipoprotein lipase; Adipose tissue lipoprotein lipase; Skeletal muscle lipoprotein lipase; Fasting.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001001100006
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Use of scanning electron microscopy for the evaluation of intestinal epithelium integrity R. Bras. Zootec.
Gomide Junior,Marcio Heber; Sterzo,Elton Vinícius; Macari,Marcos; Boleli,Isabel Cristina.
This work reports the use of scanning electron microscopy to evaluate intestinal epithelium loss in broilers. Intestinal mucosa of male and female chicks submitted to prolonged period post-hatching of water and feed deprivation was evaluated. Two segments of the duodenum, jejunum and ileum were taken per bird, and routinely processed by scanning electron microscopy. Six distinct degrees of epithelium loss were determined: degree 0, normal villi without apparent extrusion; degree 1, villi presenting small areas of epithelium loss; degree 2, villi without epithelium at the apex; degree 3, villi without epithelium at the apical region; degree 4, villi without epithelium in the upper half; degree 5, lack of epithelium in the whole villus; degree 6, loss of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broilers; Fasting; Intestinal epithelium loss; Scanning electron microscopy.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982004000600017
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