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| Ahmad,S; Mehmood,S; Javed,K; Mahmud,A; Usman,M; Rehman,A; Ishaq,HM; Hussain,J; Ghayas,A. |
| ABSTRACT The present study evaluated different selection strategies to improve the growth performance and carcass traits of Japanese quails. To this end, 540 Japanese quails previously selected for high body weight at three ages (10, 12 and 14 weeks) from four close-bred flocks (Major, Kaleem, Saadat and Zahid) were subjected to three selection strategies: pedigree-based, mass selection or random-bred (controls). For pedigree-based selection, 108 birds (4 close-bred flocks × 3 age groups × 9 replicates × 1 bird each) with full pedigree and selected for high body weight were used, whereas in mass selection 324 birds (4 close-bred flocks × 3 age groups × 9 replicates × 3 birds each) with high body weight were selected to be the parents of next generation.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pedigree Selection; Mass Selection; Parental Age groups; Close-bred Flocks; Feed Conversion Ratio; Carcass yield. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000300497 |
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| Azhar,M; Mahmud,A; Usman,M; Javed,K; Ishaq,HM; Mehmood,S; Ahmad,S; Hussain,J; Ghayas,A; Abbas,M. |
| ABSTRACT The study was planned to evaluate the effect of different naked-neck (NN) chicken genotypes and breeder ages on the growth performance of their progenies. A total of 126 chicks, from two breeder ages and three NN varieties, were reared up to 20 weeks of age. A randomized complete block design in factorial arrangement, with six treatments of seven replicates of two females and one male each, was applied. Treatments consisted of three NN varieties (light brown, black, and dark brown) and two breeder age groups (45 and 55 weeks old). Growth performance (body weight gain, feed intake and feed conversion ratio) were evaluated. Higher feed intake was observed in both the male and female progenies of 55-week-old compared with 45-week-old breeders. Light... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeder age; Naked-neck chickens; Progeny growth performance; Varieties.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300312 |
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