Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection
An experimental population of chickens was developed from the cross between 2 indigenous Chinese breeds, Dongxiang blue eggshell and Jiangshan black-bone. This breeding was aimed at eventually combining dark heavy black-bone body and blue eggshell, into a single dual-purpose breed. BW was recorded a...
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doaj-3f2c261e115f4810a8757c8d61a3ea482021-04-24T05:55:42ZengElsevierPoultry Science0032-57912021-05-011005101035Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selectionHuanhuan Wang0Avigdor Cahaner1Lifeng Lou2Lei Zhang3Ying Ge4Qinghai Li5Xuedong Zhang6Animal Husbandry Institute, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, ChinaFaculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, IsraelAnimal Husbandry Institute, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, ChinaAnimal Husbandry Institute, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, ChinaAnimal Husbandry Institute, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, ChinaAnimal Husbandry Institute, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, ChinaAnimal Husbandry Institute, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, China; Corresponding author:An experimental population of chickens was developed from the cross between 2 indigenous Chinese breeds, Dongxiang blue eggshell and Jiangshan black-bone. This breeding was aimed at eventually combining dark heavy black-bone body and blue eggshell, into a single dual-purpose breed. BW was recorded and skin L∗, a∗, and b∗ color parameters were measured by a Chroma Meter at several ages (56, 105, 150, 200, 250, and 300 d). At 250 d, 3 independent observers classified skin darkness using a 3-level visual scale (1 = light, 2 = intermediate, 3 = dark). The 7-level average visual skin darkness, calculated for each chicken, was highly correlated (−0.658 and −0.612 in females and males, respectively) with skin L∗ (lightness), indicating that the accurately measured L∗ is reliable and useful reverse expression of visual skin darkness of black-bone chickens. Mean BW and skin L∗ of both sexes increased with age, to 2,063 and 1,522 g in males and females, respectively, at 300 d, and to 63 and 55 L∗ units in males and females, respectively, at 250 d. The population's full-pedigree allowed estimating heritability and genetic correlations between traits. The heritability estimates of BW were similar in both sexes, increasing from around 0.25 at 56 d, to 0.53 to 0.60 at 150 d, and 0.57 to 0.62 at 300 d. Over the 5 ages, heritability estimates of skin L∗ were moderate to high, ranging from 0.45 to 0.58 in females, and from 0.31 to 0.65 in males, and the genetic correlations between BW and L∗ ranged mostly from 0.20 to 0.45. These low-to-moderate correlations between high BW and high L∗ (low darkness) are unfavorable; hence they were combined into an index, standardized BW minus standardized L∗, allowing future selection for high BW with low L∗. With high heritability of this index, 0.487 (females at 300 d) and 0.410 to 0.555 (males at 150 d or older), simultaneous improvements in BW and skin darkness appear to be feasible. The methodology used in this study can be useful in chicken populations experimentally bred for combination of high BW and other body characteristics.http://www.sciencedirect.com/science/article/pii/S0032579121000699black-bone chickenBWskin darknessL∗a∗b∗ color scaleselection index |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Huanhuan Wang Avigdor Cahaner Lifeng Lou Lei Zhang Ying Ge Qinghai Li Xuedong Zhang |
spellingShingle |
Huanhuan Wang Avigdor Cahaner Lifeng Lou Lei Zhang Ying Ge Qinghai Li Xuedong Zhang Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection Poultry Science black-bone chicken BW skin darkness L∗a∗b∗ color scale selection index |
author_facet |
Huanhuan Wang Avigdor Cahaner Lifeng Lou Lei Zhang Ying Ge Qinghai Li Xuedong Zhang |
author_sort |
Huanhuan Wang |
title |
Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection |
title_short |
Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection |
title_full |
Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection |
title_fullStr |
Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection |
title_full_unstemmed |
Genetics and breeding of a black-bone and blue eggshell chicken line. 1. Body weight, skin color, and their combined selection |
title_sort |
genetics and breeding of a black-bone and blue eggshell chicken line. 1. body weight, skin color, and their combined selection |
publisher |
Elsevier |
series |
Poultry Science |
issn |
0032-5791 |
publishDate |
2021-05-01 |
description |
An experimental population of chickens was developed from the cross between 2 indigenous Chinese breeds, Dongxiang blue eggshell and Jiangshan black-bone. This breeding was aimed at eventually combining dark heavy black-bone body and blue eggshell, into a single dual-purpose breed. BW was recorded and skin L∗, a∗, and b∗ color parameters were measured by a Chroma Meter at several ages (56, 105, 150, 200, 250, and 300 d). At 250 d, 3 independent observers classified skin darkness using a 3-level visual scale (1 = light, 2 = intermediate, 3 = dark). The 7-level average visual skin darkness, calculated for each chicken, was highly correlated (−0.658 and −0.612 in females and males, respectively) with skin L∗ (lightness), indicating that the accurately measured L∗ is reliable and useful reverse expression of visual skin darkness of black-bone chickens. Mean BW and skin L∗ of both sexes increased with age, to 2,063 and 1,522 g in males and females, respectively, at 300 d, and to 63 and 55 L∗ units in males and females, respectively, at 250 d. The population's full-pedigree allowed estimating heritability and genetic correlations between traits. The heritability estimates of BW were similar in both sexes, increasing from around 0.25 at 56 d, to 0.53 to 0.60 at 150 d, and 0.57 to 0.62 at 300 d. Over the 5 ages, heritability estimates of skin L∗ were moderate to high, ranging from 0.45 to 0.58 in females, and from 0.31 to 0.65 in males, and the genetic correlations between BW and L∗ ranged mostly from 0.20 to 0.45. These low-to-moderate correlations between high BW and high L∗ (low darkness) are unfavorable; hence they were combined into an index, standardized BW minus standardized L∗, allowing future selection for high BW with low L∗. With high heritability of this index, 0.487 (females at 300 d) and 0.410 to 0.555 (males at 150 d or older), simultaneous improvements in BW and skin darkness appear to be feasible. The methodology used in this study can be useful in chicken populations experimentally bred for combination of high BW and other body characteristics. |
topic |
black-bone chicken BW skin darkness L∗a∗b∗ color scale selection index |
url |
http://www.sciencedirect.com/science/article/pii/S0032579121000699 |
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