Effect of selection for productive traits in broiler male lines on embryo development
| Autor: | Elsio Antonio Pereira de Figueiredo, GS Schmidt |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
genetic gain
embryo weight Biology Body weight Genetic correlation meat lines Animal science egg weight lcsh:Zoology lcsh:QL1-991 Incubation Selection (genetic algorithm) lcsh:SF1-1100 lcsh:Veterinary medicine business.industry Embryogenesis Broiler Embryo Correlation Biotechnology Genetic gain embryonic structures lcsh:SF600-1100 Animal Science and Zoology lcsh:Animal culture business |
| Zdroj: | Brazilian Journal of Poultry Science, Vol 11, Iss 1, Pp 17-20 (2009) |
| ISSN: | 1516-635X |
| DOI: | 10.1590/s1516-635x2009000100003 |
| Popis: | This study used 300 females and 30 males with 36 weeks of age from the selected PP and control PPc maternal broiler lines. PP has been selected for heavy body weight (PC) and high egg production for eight generations. Fertile eggs were collected and weighed individually for 4 periods of 5 consecutive days at two-week intervals. In each period, a total of 960 eggs/line were identified and separated in groups of 240 eggs, and stored for later incubation. Embryo weight (PE) was evaluated at 9 (P9), 11 (P11), 13 (P13), 15 (P15), 17 (P17) and 21 (P21) days of incubation. The objective was to estimate the effect of selection on embryo development. Egg weight (PO) was similar between the two lines. The differences in PE were significant from P15 on, resulting in 1.9g of difference in the chick weight, indicating correlated genetic changes in the embryo development, which can be credited to the selection for PC. Changes in PE while PO was kept unaltered modified the correlations between these two traits. Differences were significant from P13 on and estimated correlations for P21 were 0.72 and 0.70 for PP and PPc, respectively. Chick weight corresponded to 70.91% (PP) and 68.48% (PPc) of egg weight. The estimated increase in P21 that resulted from the increase of 1.0g in PO was 0.71 in PP and 0.68g in PPc. |
| Databáze: | OpenAIRE |
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