COMPARATIVE STUDIES ON SOME PRODUCTIVE TRAITS AND RATE OF CALCIUM ABSORPTION OF THREE LOCAL STRAINS OF CHICKEN | ||||
| Journal of Animal and Poultry Production | ||||
| Article 2, Volume 27, Issue 10, October 2002, Page 6629-6643 PDF (4.22 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2002.256758 | ||||
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| Authors | ||||
| M. S. Gado,1; G. M. EL-Gendi1; A. M. EL-Wardany2; H. R. Samak2 | ||||
| 1Animal Production Department, Faculty of Agriculture, Zagazig University, Benha Branch. | ||||
| 2Animal Production Research Institute, Agriculture Research Center. | ||||
| Abstract | ||||
| A total number of 432pullets (aged 22 weeks) from Gimmizah, Mamourah, and Bandara strains (144 from each strain) were subjected to study. Birds were individually caged (after sexual maturity) to classifying them into three groups according to the time required for egg formation. Pullets of each group (48 pullets) were distributed in 3 breeding pens (each of 16 females and 2 males). The' experiment aimed to study the effect of strain and time spent for egg formation on productive performance, thyroid activity and calcium absorption rate of laying hens of different local strains. Results obtained can be summarized as follows. Bandara pullets had higher average of feed consumption (121.47 gm/hen/day). However, Gimmizah pullets showed higher feed efficiency (0.27 gm egg/gm feed). Pullets needed less than 25 hours for their egg to be formed consumed Significantly (p < 0.05) more feed (119.96 gm/bird/day). Feed efficiency mounted 0.26 gm egg/gm feed in all studied groups of birds of different time needed for egg formation. Mamourah pullets had higher averages of egg production and egg mass (62.97%/hen Iday and 31.11 gm/hen/day, respectively). However, the highest egg weight was found in Gimmizah (49.02 gm). Pullets needed less than 25 hours for their completely formation had higher egg production and egg mass. Significant effect (p < 0.05) on the rate of egg production only was found due to time of egg formation. Eggs from Gimmizah pullets had significantly the highest mean of shell thickness (0.354 mm) than those of Mamourah (0.344mm) and Bandara (0.339mm). Eggs laid by Bandara pullets had significantly higher fertility percentage (90.43%). On the other hand, eggs laid by Mamourah pullets had significantly higher hatchability percent (90.68%). Time required for eggs to complete their passage along the oviduct had highly significant effect (p < 0.001) on hatchability percentage .The total absorption of calcium and absorption per gm dry matter were found to be mostly higher in Gimmizah followed by Bandara then by Mamourah pullets. Pullets needed less than 25 hours to complete its egg formation had significantly higher in total calcium absorption and absorption per gm dry matter. The greatest values of total calcium absorption and absorption per cm length of the small intestinal was attained in ileum followed by jejunum and duodenum, respectively. Highly significant variations (p < 0.001) in total calcium absorption, absorption per gm dry matter and per cm length were found due to different intestinal regions. Mamourah pullets had significantly (p < 0.001) the highest level of plasma T3 and T3/T 4 ratio. On the other hand, pullets of Gimmizah had the highest level of plasma T4. Pullets needed less than 25 hours for egg formation had higher plasma T3 level and T3/T4 ratio, while pullets needed more than 26 hours for egg formation were high in plasma T4 level. | ||||
| Keywords | ||||
| strain; egg formation; egg production; incubation traits; traits of calcium absorption; T3; T4; T3/T4 ratio | ||||
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