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254715

SELECTION FOR GROWTH AND NURSING ABILITY IN BALADI RED RABBITS -DIRECT RESPONSES

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Last updated: 04 Jan 2025

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Abstract

A selection experiment, for high 4-week body weight and high litter weight at weaning (4 weeks), was carried out for three generations of  Baladi Red rabbit.  A total number of 18 bucks and 48 does  were taken from the third generation of the base population to construct the initial generation of selection. The animals were randomly assigned to three mating groups, the first group (G) was established  by selection for high individual body weight at 4 weeks of age  and  the second was established by selection for high litter weight at weaning (M), while the third was maintained as a  randombred contemporary control (C) .  The results obtained were as follow:  Individual body weights at 4 weeks of age (BW4) in line (G)  were increased  significantly (P<0.01) from 314.2 g at the first generation to 339.8 g at the third generation, while there were no significant differences in body weight at 4 weeks of age  for the  control line. Rabbits of the selected line gained 5.35% more than those of the control  line at the third generation of selection.    Litter weights at weaning (LW4) in line (M) were increased significantly (P<0.01) from 1610.2 g at the first generation to 1654.1 g at the  third generation, while there were no significant differences in litter weight at 4 weeks of age for the control line.   Litter weights of selected line were 3.83% more than those of the control line at the third generation of selection.   Both BW4 and LW4 were significantly affected by generation, line and dam; while the effect of sire was not significant. No significant differences were detected between the expected and actual selection differentials for both characters (BW4 and LW4) through the three generations of selection. The realized response to selection for BW4 decreased from 4.6 g at the first generation to 2.1 g at the third generation, while that for LW4 decreased from 7.2 g at the first generation to 4.6 g at the third generation.                           Heritability of BW4, calculated from the sire variance component was 0.26, and that calculated from the dam variance component was 0.54, while that obtained from the sire plus the dam variance components was intermediate between the two  estimates, it was 0.40 and  the realized heritability  ranged between 0.49 and 0.63.  Heritability of LW4, calculated from the sire variance component was 0.34, and that calculated from the dam variance component was 0.56, while that obtained from the sire plus the dam variance components was intermediate between the two  estimates, it was 0.45 and the realized heritability ranged between 0.53 and 0.67.  

DOI

10.21608/jappmu.2002.254715

Authors

First Name

G.

Last Name

Attalah,

MiddleName

E. Y.

Affiliation

Department of Animal Production, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo.

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Volume

27

Article Issue

5

Related Issue

36178

Issue Date

2002-05-01

Receive Date

2002-04-03

Publish Date

2002-05-01

Page Start

2,837

Page End

3,847

Print ISSN

2090-3642

Online ISSN

2090-3723

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https://jappmu.journals.ekb.eg/article_254715.html

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https://jappmu.journals.ekb.eg/service?article_code=254715

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Original Article

Type Code

876

Publication Type

Journal

Publication Title

Journal of Animal and Poultry Production

Publication Link

https://jappmu.journals.ekb.eg/

MainTitle

SELECTION FOR GROWTH AND NURSING ABILITY IN BALADI RED RABBITS -DIRECT RESPONSES

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Article

Created At

22 Jan 2023