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- W1985754041 abstract "1. A stock of cross-bred CD hens was divided into ‘resistant’ (R) and ‘sensitive’ (S) to stress on the basis of the heterophil/lymphocyte (H/L) ratio using the lower 99% confidence limit method for selection. A first generation was produced from these R and S females mated with similarly selected R and S local Barred males. The association between ‘resistance’ and some production traits was investigated. 2. The proportions of R:S among CD females and Barred males was 51·2:48·8 and 52:48, respectively. Mean H/L ratios for Barred males and females, respectively, were 0·87 ± 0·03 and 0·83 ± 0·03 (P > 0·05). 3. Compared with the S group in CD females, the R group had greater egg production (59% vs 51%), egg weight (65·5 g vs 62·6 g) and body weight at 39 weeks (115 g heavier). 4. The superiority of R in terms of proportion of fertile eggs, hatchability and the proportion hatched from those set amounted to 4·8, 6·1 and 5·4%, respectively. 5. The proportion of dead embryos in the R group (5·4%) was lower than in the S group (9·3%). 6. With the F1 generation the R chicks were heavier at hatching. 7. Percentage mortality of male F1 chicks, from hatching to 4 weeks and from 4 to 8 weeks, was lower in the R group. A similar, but non-significant, trend was noted for R females. 8. The progeny of the R group was heavier than the S progeny at 4 and 8 weeks and also the percentage dressed weight of males was greater at 8 weeks. The R group was heavier than the S group at 4, 8 and 12 weeks. 9. These results suggest that selection for general ‘resistance’, on the basis of the H/L ratio using the 99% lower confidence limit method of selection, is positively correlated with several important production and reproduction traits. Establishing resistant lines with high production rates seems feasible." @default.
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- W1985754041 date "2006-08-01" @default.
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- W1985754041 title "Association between heterophil/lymphocyte ratio, a marker of ‘resistance’ to stress, and some production and fitness traits in chickens" @default.
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- W1985754041 doi "https://doi.org/10.1080/00071660600829118" @default.
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