IMPROVING THE PRODUCTIVITY OF BAHEIJ CHICKENS THROUGH BOTH OF BACKCROSSING AND SELECTION FOR BODY WEIGHT AT 8 WEEKS OF AGE C. GROWTH TRAITS, BODY CONFORMATION, CHICK VIABILIT, AND CARCASS TRAITS | ||
| Egyptian Poultry Science Journal | ||
| Article 1, Volume 37, Issue 1, March 2017, Pages 1-19 PDF (643.75 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/epsj.2017.5376 | ||
| Author | ||
| yousria kamal afifi | ||
| Anim. Prod. Res. Inst., Agric. Res. Center, Ministry of Agric., Dokki, Egypt | ||
| Abstract | ||
| Comparison study was carried out among three genotypes of Baheij breed, Baheij selected breed for increasing body weight at 8 weeks of age, Baheij upgraded groups through three generations and control group. Results were as follows: 1- Chicks of the 3rd generation were the heaviest (p<0.001) compared to those of the 1st and 2nd one at the different studied ages. Also, means of body weight of the upgraded group was the highest (p<0.001) compared to the other two groups and the selected group surpassed (p<0.001) the control one at all ages studied. 2- The three studied factors affected significantly growth rate percentage (GR %) where birds of the 3rd generation had the highest value of GR% through most of the studied intervals. The upgraded group had the highest mean at 12-16 wks of age where, the selected group grew faster at 8-12 wks of age. Both of the upgraded and the selected groups had significantly the highest values compared with the control one at 0-12, 12-20 and at 0-16 wks of age, while both of the upgraded and control groups surpassed (p<0.001) the selected one at 12-16 wks of age. 3- Body weight (BW), shank length (SL), keel length )KL) and breast width had significantly (p<0.01) higher averages at 12 wks. of age compared to those at 8 wks of age. Also, the selected group had significantly the highest BW while, the upgraded group had the highest average of SL. Moreover, males were heavier (p<0.01) than females. 4- The birds of the 2nd generation had the best (p<0.01) chick viability at 0-4 wks of age, while the values of both of the 1st and 3rd generations were nearly similar and higher than that of the 2nd one at 4-8 wks of age. 5- Live body weight, carcass, gizzard, and heart weights differed (p<0.01) in birds of the 3rd generation compared to that of the 2nd one at 16 and 20 wks of age. On the other hand, upgraded group had the highest (p<0.01) values of most of carcass studied traits compared to the others, while the control one had significantly (p<0.01) the heaviest liver. It could be concluded that upgrading through crossing Silver Montazah sires to Baheij strain dams surpassed the selection in Baheij strain at 8 weeks of age throughout three generations in improving growth traits, chick viability, and carcass traits of progeny of both F2 and F3. | ||
| Keywords | ||
| Upgrading- Selection-Growth and carcass traits- Body conformation- Chicks viability | ||
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