Comparison of Cobb and Ross strains in embryo physiology and chick juvenile growth

Poultry Science
K TonaE Decuypere

Abstract

Broiler performance is known to be related to embryonic developmental parameters. However, strain or genotype differences with regard to embryo physiological parameters and juvenile growth have received little attention. A total of 1,200 hatching eggs produced by Cobb and Ross broiler breeders of the same age were studied. At setting for incubation and between 66 and 130 h of incubation, egg resonant frequency (RF) was measured as an indicator of embryonic development. Also, eggs were weighed before setting and at d 18. From d 10 to 18 of incubation, remaining albumen was weighed. During the last days of incubation, hatching events such as internal pipping (IP), external pipping, and hatch were monitored every 2 h. Hatched chicks were recorded and weighed. At IP stage, gas partial pressures in the egg air chamber were measured. Hatched chicks were reared for 7 d and weighed. Results indicate that RF of Ross eggs were lower than those of Cobb eggs (P < 0.01) and starting time point of RF decrease occurred earlier in Cobb eggs than in Ross eggs. Relative egg weight loss up to 18 d of incubation was lower in Cobb than in Ross (P < 0.05). At IP, partial pressure of CO(2) was higher in Cobb than in Ross (P < 0.05) with shorter incub...Continue Reading

Citations

Dec 4, 2012·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Xiang-guang LiXiu-qi Wang
Dec 21, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·L PinedaA Chwalibog
Aug 5, 2015·Poultry Science·A NangsuayH van den Brand
Jun 15, 2016·Animal : an International Journal of Animal Bioscience·P J Groves, W I Muir
Aug 9, 2017·Animal : an International Journal of Animal Bioscience·W I Muir, P J Groves
Oct 28, 2018·Journal of Animal Physiology and Animal Nutrition·Marco ZampigaFederico Sirri
Sep 29, 2019·British Poultry Science·A C DonofreI E P Ferreira
Nov 18, 2018·Animal : an International Journal of Animal Bioscience·W I Muir, P J Groves
Feb 10, 2021·Veterinary Medicine and Science·Cocou Claude KpomasseKokou Tona

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