2004
DOI: 10.1590/s0100-204x2004000500014
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Comparação de métodos de determinação da gravidade específica de ovos de poedeiras comerciais

Abstract: O objetivo deste trabalho foi avaliar um aparelho desenvolvido para a determinação da gravidade específica (GE) do ovo em água, comparando-o ao método de imersão em solução salina. Foram coletados 200 ovos de duas linhagens de poedeiras comerciais, divididos ao acaso em dois grupos de 50 ovos por linhagem e submetidos a duas seqüências de determinação da GE. Não foram observadas diferenças significativas entre os métodos utilizados. A determinação da GE dos ovos utilizando o aparelho desenvolvido pode ser real… Show more

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Cited by 53 publications
(31 citation statements)
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“…During this period, the sunset and sunrise occurred at 5:25 p.m. and 5:12 a.m., respectively, totaling 12 hours and 13 minutes of natural light. Thus, while the circadian clock of birds is set to zero at the first capture of natural or artificial light after a dark period, so that the photosensitive phase occurs at about 11 hours after the initial stimulus and ends about 2 to 3 hours later (Freitas et al, 2004), the beginning of light-sensitive period in this study would start at 16h12, and therefore even subjected only to natural light, birds received at least 1 hour and 13 min of daylight during their photosensitivity period. This amount of light was certainly enough to ensure good performance.…”
Section: Resultsmentioning
confidence: 99%
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“…During this period, the sunset and sunrise occurred at 5:25 p.m. and 5:12 a.m., respectively, totaling 12 hours and 13 minutes of natural light. Thus, while the circadian clock of birds is set to zero at the first capture of natural or artificial light after a dark period, so that the photosensitive phase occurs at about 11 hours after the initial stimulus and ends about 2 to 3 hours later (Freitas et al, 2004), the beginning of light-sensitive period in this study would start at 16h12, and therefore even subjected only to natural light, birds received at least 1 hour and 13 min of daylight during their photosensitivity period. This amount of light was certainly enough to ensure good performance.…”
Section: Resultsmentioning
confidence: 99%
“…Egg specific weight was determined using the procedures described by Freitas et al (2004). For this, the weighing system is mounted on a precision scale (0.01 g) to obtain the egg weight in air and water.…”
Section: Methodsmentioning
confidence: 99%
“…Egg specific gravity was determined according to procedures described by Freitas et al (2004). Egg weight was determined on the scale precision AD 1000, both in the air and in water, and the specific gravity was measured by the equation Specific gravity = WA/(WW × F), in which: WA is the egg weight in the air; WW is the egg weight in water; and F is the temperature correction factor.…”
Section: Methodsmentioning
confidence: 99%
“…Para isso, os ovos oriundos das aves provenientes de cada repetição eram coletados, contados e pesados por repetição. Três deles eram selecionados aleatoriamente, determinando inicialmente a gravidade específica (GE) dos ovos utilizando-se os procedimentos descritos por Freitas et al (2004), onde foi montado sobre balança de precisão (0,01 g) um sistema de pesagem dos ovos para obtenção do peso do ovo no ar e na água. Os valores do peso do ovo no ar e na água foram anotados para o cálculo da gravidade específica, por meio da equação GE = PO/(PA × F), em que: PO = peso do ovo no ar; PA = peso do ovo na água; e F = fator de correção da temperatura.…”
Section: Methodsunclassified