Hatching egg and newly hatched chick yolk sac total IgY content at 3 broiler breeder flock ages

Poultry Science
A M Ulmer-FrancoL M McMullen

Abstract

During the first week of the posthatching period, before the immune system is mature enough to produce its own B lymphocytes, a chick's humoral immunity depends on maternal antibodies (IgY) received from the egg yolk. During incubation and after hatching, the yolk sac (YS) membrane transfers nutrients (including IgY) from the egg yolk to the developing embryo or newly hatched chick. The objective of this study was to determine the effects of breeder flock age on the total IgY content of egg yolks and chick YS from a commercial broiler breeder strain. Hatching eggs from the same broiler breeder flock were collected at 32, 40, and 55 wk of age. One group of eggs per flock age was used to determine the egg yolk total IgY content. Another group of eggs was incubated for 21.5 d, and upon hatching, the YS of newly hatched chicks were collected to determine the total IgY content. Egg and egg yolk weight increased with flock age, but YS weights did not reflect egg yolk weight. The total IgY content per gram of egg yolk increased with flock age; this fact plus the observed yolk weight increase with flock age notably increased the total IgY contained in yolks of eggs laid by 55-wk-old breeders. However, chicks hatching from 55-wk-old bre...Continue Reading

Citations

Apr 16, 2013·Avian Pathology : Journal of the W.V.P.A·Dorien MotFilip Van Immerseel
Mar 8, 2016·Journal of Animal Science and Biotechnology·Gita Cherian, Nathalie Quezada
Jul 2, 2014·Avian Pathology : Journal of the W.V.P.A·Dorien MotFilip Van Immerseel
Jan 1, 2013·Annual Review of Animal Biosciences·David ParraJ Oriol Sunyer
Aug 14, 2019·The Journal of Veterinary Medical Science·Atsushi KobayashiKazunari Ushida
Jan 11, 2020·Frontiers in Genetics·Tom V L BerghofHan A Mulder
Jul 8, 2021·Journal of Animal Physiology and Animal Nutrition·Paula Costa CardealLeonardo José Carmagos Lara

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