Variation in the Development of Embryos of Hens’ Eggs

McNally, E. H.; Byerly, T. C.

doi:10.3382/ps.0150280

Cited by 34 publications

(18 citation statements)

References 7 publications

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“…Figure 1 presents the frequency of various somite numbers of one hundred fifty-three 48-hour embryos. It is apparent that the majority of 48-hour embryos were in the 12 to 18 somite range, but the total range was from 6 up to 25 somites conforming with the findings of McNally and Byerly (1936). Also shown are the number of embryos in each somite group which showed a beginning of amnion development as represented by It can be noted that, although the majority of the embryos of 20 or more somites showed amnion growth, there were a number in the more advanced groups that did not, and in the majority of all embryos there was no visible development of the amnion.…”

Section: Resultssupporting

confidence: 81%

“…It would seem quite plausible to assume from the data that some of the larger individuals would also fall into this category. McNally and Byerly (1936) found that the embryos showing the most advanced development at 48 hours had the highest rate of mortality, those showing the least advanced development had the next highest mortality while the intermediate group had the least mortality, substantiating the hypothesis that factors other than "slow developing, weak embryos," per se, were in part responsible for the mortality peaks.…”

Section: Resultsmentioning

confidence: 66%

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Chronological Relationship of the Disappearance of the Vitelline Membrane and the Closure of the Amnio-Chorion in Avian Embyros and Its Implications ,

Sadler

1955

Poultry Science

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 66%

Chronological Relationship of the Disappearance of the Vitelline Membrane and the Closure of the Amnio-Chorion in Avian Embyros and Its Implications ,

Sadler

1955

Poultry Science

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“…Since the time lag between the hatching of the first and the last chick may be long, this may be an important factor affecting early chick performance. Incubation period have been found to lengthen (Olsen, 1942;Williams et al, 1951, Hudson et al, 2004 to shorten (McNally & Byerly, 1936;Smith & Bohren, 1975;Burton & Tullet, 1985) or not to change (Reis et al, 1997) with the aging of hens and the consequent increases in egg size. Variations in incubation length may be related to breed and line within breed and therefore this trait may be altered by selection Smith & Bohren, 1975).…”

Section: Resultsmentioning

confidence: 98%

Hatching distribution of eggs varying in weight and breeder age

Vieira

Almeida

Lima

et al. 2005

Rev. Bras. Cienc. Avic.

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Broiler chicks from one incubator hatch within long periods of time, which leads to dehydration and reduction in yolk sac reserves of those chicks that have hatched earlier and potentially impairs early performance. The present research investigated the hatching distribution at intervals of incubation using eggs of different weights within one breeder age or eggs from widely different breeder ages. Eggs from breeders at 27 and 59 weeks of age (54 and 69 g) and from breeders at 40 weeks of age, which were graded as light (58 g) and heavy (73 g), were placed in a commercial incubator. There were a total of 1,184 eggs distributed in four treatments and eight replicates: eggs from 27-week-old breeders (27B), eggs from 59-week-old breeders (59B), light eggs from 40-week-old breeders (40BL) and heavy eggs from 40-weekold breeders (40BH). Replicates were comprised of 37 eggs that were placed in each incubator tray. The treatments were physically separated from each other using a plate. Eggs were transferred to a hatcher after 432 hours of incubation and the first chick hatched at 449 hours of incubation. Afterwards, the number of completely hatched chicks from each replicate was recorded at six-hour intervals until 503 hours of incubation, when the hatchings stopped. Hatched chicks were removed from the trays after each measurement. Data were submitted to an analysis of variance with repeated measures. There was a significant interaction between breeder age and incubation length. The hatching onset of eggs from the old breeders was later compared to young breeders. Hatchability (%incubated eggs) was lower for the old breeders; however, differences in hatchability as a percentage of the hatched eggs were not so evident. Complete hatchability occurred only at 503 hours of incubation; however, more than 90% eggs had hatched 18 hours earlier.

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“…McNally and Byerly (1935) also studied this problem by counting somites after 48 hours of incubation. They found that the number of somites in the embryos decreased slightly in eggs laid during the latter part of the day.…”

Section: Tracing the Developing Eggsmentioning

confidence: 98%