Search

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The aim of this study was to compare the commercial eggs quality in eastern Algeria. A total of 5004 eggs from three genetic types (local hens -PL, industrial -PI- hens and chickens from crossing local chickens and industrial-PLPI- hens) were analyzed. Eggs weight, albumen weight and maximum breaking strength of the shell from the industrial strain were significantly higher than those from other genotypes (P <0.001). Eggs from local chickens, despite a lower weight to other genotypes (PL: 54.15g; PLPI: 59.74g; PI: 66.62g; P <0.05) while yellow/albumen ratio (0.57, 0.50 and 0.44 respectively) was higher (P <0.05). Maximum breaking strength of the shell was significantly (P <0.05) lowest in PL (35,99N) compared to PLPI (36.76N) and PI (37.30N). Significant correlation coefficients (P <0.001) were recorded between egg weight and albumen weight (0.95), yolk weight (0.50), shell weight (0.69), albumen percentage (0.79), proportions of yellow (-0.74) and shell percentage (-0.37), the average thickness of the shell (0.60), Haugh units (-0.18), shape index (0.19), yellow / albumen ratio (-0.75) and the maximum breaking strength of the shell (0.10). The origin of the eggs (PL, PLPI and PI) influences significantly on composition and quality of commercial eggs in eastern Algeria. [ABSTRACT FROM AUTHOR]

This work investigates laying performances and egg quality of 200 quails during 266 laying days. The first collected 240 eggs, for the periods: 12, 16, 20, 24, 28, 32, 36, 40, 44 weeks were used in this study. The average laying rate calculated over a period of 37 weeks is 74.44 %. All studied eggs quality parameters were significantly (p<0.001) influenced by the age of the quail. The average weight of the whole egg (13.66 g), yolk (3.99 g) and shell (2.28 g) reach their maximum value at the 40th week. The maximum albumen average weight (7.45 g) was observed at 32nd week. Albumen (12.02) and yolk (48.72) indices recorded their highest values at the 12th and the 16th weeks, respectively. The eggs freshness, expressed here by Haugh units decreased with age. They range from 89.56 at the 12th week to 83.71 at the 44th week of age. Yolk color registered values with irregular fluctuations (7.12 to 9.33) in a colorimetric scale of 15 ladders. Highly significant and positive correlations (p<0.001) and were recorded between the whole egg weight and the weight of albumen, yolk and shell. To conclude, the quail age affects significantly the various egg quality parameters. [ABSTRACT FROM AUTHOR]

In Belgium, as generally in Europe, the dominant position of the high producing commercial strains specialized in meat or eggs production threats of extinction the local traditional breeds. In this work, a follow up of the changes in populations size, and the rates of inbreeding of the Belgian poultry breeds, has been carried out in 2005 and 2010. About forty breeds were concerned. The Belgian hen breeds being overwhelmingly under threat of extinction, because of the low number of individuals by breed. For each of these breeds, various criteria were considered, risk status, breeding male to breeding female ratio, effective population size, effective population size to actual size ratio and rate of inbreeding. [ABSTRACT FROM AUTHOR]