Developmental Stages of the Broad Breasted Bronze Turkey Embryo ,

Mun, A. M.; Kosin, I. L.

doi:10.2307/1538937

Cited by 28 publications

(15 citation statements)

References 4 publications

(2 reference statements)

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“…The first day after hatching when the cloacal membrane ruptured and most of the intestinal contents came out of the hatchling was defined as the post hatching day (PHD). The developmental stages were identified according to the criteria published in Mun and Kosin (1960) and Christensen et al (1982) for turkey, with reference to the classification of Hamburger and Hamilton (1951) for chicken.…”

Section: Egg Incubation and Embryo Stagingmentioning

confidence: 99%

Protease activity in the egg yolk during the development of Meleagris gallopavo (Galliformes: Phasianidae) embryos

Shbailat

Qanadilo

Alsoubani

2016

Italian Journal of Zoology

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The egg white and egg yolk are the two main sources of nutrients for the developing avian embryo. Egg white ultimately reaches egg yolk before being consumed by the embryo. Previously, in the turkey Meleagris gallopavo, we showed that the major egg white transfer into the yolk through the amnion and intestinal lumen of the embryo started on day 17 and became obvious on day 19. We also suggested that the transferred egg white and endogenous yolk proteins undergo digestion at late developmental stages. However, the protease activity throughout development and the type of activated proteases are completely unexplored in the yolk of turkey eggs. Here, we measured the general proteolytic activity in the egg yolk during different developmental stages using casein as a substrate. Furthermore, we determined the type of activated proteases by employing different types of protease inhibitors. Protease activity in the egg yolk was basal throughout development until day 19 when activity significantly increased, remaining high thereafter. Moreover, acidic aspartic protease(s) were primarily activated in the yolk. Our results suggest that the transferred egg white and endogenous yolk proteins are mostly degraded by the aspartic proteases that become highly activated late in development.

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Section: Egg Incubation and Embryo Stagingmentioning

confidence: 99%

Protease activity in the egg yolk during the development of Meleagris gallopavo (Galliformes: Phasianidae) embryos

Shbailat

Qanadilo

Alsoubani

2016

Italian Journal of Zoology

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“…The first day after hatch, when the cloacal membrane ruptured and most of the intestinal contents came out of the hatchling body, is referred to as post hatch day (PHD). The developmental stages were identified according to the criteria published in Mun and Kosin (1960) and Christensen et al (1982) for turkey, with reference to the classification of Hamburger and Hamilton (1951) for chicken.…”

Section: Egg Incubation and Embryo Stagingmentioning

confidence: 99%

Transfer of egg white proteins with reference to lysozyme during the development ofMeleagris gallopavo(Galliformes: Phasianidae) embryos

Shbailat

Safi

2015

Italian Journal of Zoology

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The egg white and egg yolk are the two main sources of nutrients for the developing avian embryo. The egg white should be transferred into the yolk in order to be consumed by the embryo. How the egg white ultimately reaches the egg yolk is largely unexplored in the turkey Meleagris gallopavo. Here, we explored the routes of egg white transfer in fertilized turkey eggs. Initially, we tested the electrophoretic pattern of the proteins in different egg compartments throughout development. Then, we used lysozyme as a reference protein to follow the egg white transfer, and we measured its activity using Micrococcus lysodeikticus as a substrate. We found that several presumptive egg white protein bands appeared in the different egg compartments. Also, the electrophoretic patterns in the intestinal fluid and thick yolk were marked by the disappearance of large bands and the appearance of small ones at late developmental stages. Moreover, we detected a chronological appearance of lysozyme activity in the different egg compartments. The activity appeared in the extraembryonic and amniotic fluids on day 15, in the intestinal fluid on day 16 and in the thick yolk on day 17, and it increased in general with the progress of development. Our results suggest that the main route of egg white transfer is albumen sac -extraembryonic cavity -amniotic cavity -intestinal lumen -egg yolk. Furthermore, the transferred egg white proteins seem to undergo digestion in the intestinal lumen and egg yolk at late developmental stages.

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“…Of interest, a similar developmental delay in the early stages has been seen in a variety of bird species, including two finches (Lonchura), the budgerigar, a duck (Cairina), and a button quail (Turnix; Yamasaki and Tonosaki, 1988;Starck, 1989) and, thus, may be more typical. An immediate start of development at egg laying, as in the chicken, has only been confirmed for two other galliform birds, a turkey and a quail, as well as the pigeon (Mun and Kosin, 1960;Starck, 1989).…”

Section: Relationship Of Embryonic Stages To Incubation Timementioning

confidence: 99%

Embryonic and posthatching development of the barn owl (Tyto alba): Reference data for age determination

Köppl

Futterer

Nieder

et al. 2005

Developmental Dynamics

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Developmental Stages of the Broad Breasted Bronze Turkey Embryo ,

Cited by 28 publications

References 4 publications

Protease activity in the egg yolk during the development of Meleagris gallopavo (Galliformes: Phasianidae) embryos

Protease activity in the egg yolk during the development of Meleagris gallopavo (Galliformes: Phasianidae) embryos

Transfer of egg white proteins with reference to lysozyme during the development ofMeleagris gallopavo(Galliformes: Phasianidae) embryos

Embryonic and posthatching development of the barn owl (Tyto alba): Reference data for age determination

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