Direct and Correlated Responses from Selection for Lately Sexual Maturity in Japanese Quail | ||||
| Journal of Animal and Poultry Production | ||||
| Article 2, Volume 12, Issue 9, September 2021, Page 299-303 PDF (819.59 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2021.202394 | ||||
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| Authors | ||||
M. A. Aboul-Hassan1; D. I. Aboul-Seoud1; Ahmed Ramzy Abd-Allah  2
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| 1Department of Animal Production, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt. | ||||
| 2Department of Animal Production, Faculty of Agriculture, Al-Azhar University, Cairo, | ||||
| Abstract | ||||
| A total of 788 chicks aged 6 weeks were taken from the third generation of the base population. The birds were randomly assigned to one of two mating groups: one that was selected for recent age at sexual maturity (LASM), and the other that was kept as a randomly bred control line (RBC) The findings can be summed up as follows: The selected line (LASM) actual means of recently sexual maturity grew considerably (P0.01) from 50.24 days at generation zero to 63.23 days at the fourthgeneration of selection. The actual selection differential in the LASM line, where the average was 3.68 and 2.26 g /generation, agreed well with the expected. The actual responses to selection in the (LASM) line were consistent, averaging 1.48g per generation. After the fourth generation of selection, the realized heritability of LASM was calculated as 0.57, 0.53, 0.35, and 0.30 for the first, second, third, and fourth generations of selection, respectively. When selection for LASM, the following were responses for the researched traits: Growth traits: After four generations of selection, BW0, BW2, BW4, and BW6 rose considerably(P0.05) from 8.95, 36.58, 92.84, and 160.47g in the first generation to 9.47, 38.55, 95.90, and 172.42g.in the first generation b- Egg production trait: After four generations of selection, egg weight (EW) rose significantly (P0.05) from 10.32g in the first generation to 11.62g. After four generations of selection, body weight at sexual maturity (BWSM) increased insignificantly from 136.32 g in the first generation to 145.02 g. | ||||
| Keywords | ||||
| selection; lately sexual maturity; direct response; correlated response; Japanese quail | ||||
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