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114314

CORRELATED RESPONSE ON LITTER TRAITS AND MILK YIELD IN NEW ZELAND WHITE RABBITS SELECTED FOR LITTER SIZE AT BIRTH

Article

Last updated: 03 Jan 2025

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Abstract

The current study evaluated the influence of selection for litter size at birth on litter traits and milk yield of New Zealand White (NZW) rabbits. A total of 2231 litters produced from 360 does and 72 bucks were used to assess litter size at birth (LSB) and weaning (LSW), litter weight at birth (LWB), litter weight at 21 d (LW21) and  litter weight at weaning (LWW), as well as mortality percentage (MOR%) from birth (total alive) till weaning age, milk yield at lactation intervals of 0–7 d (MY07), 7-14 d (MY14), 14-21 d (MY21), 21-28 d (MY28) and 0-28 d (TMY) and milk conversion ratio during 21 d of lactation (MCR021). Multi-trait animal model was used to data analysis using VCE6 programe. Estimates of heritability  for litter traits were low and ranging from 0.05  for LSB to 0.14 for LWB. Also, estimates for milk yield traits were low and ranged from 0.08 for MY7 to 0.22 for MY21. The contrast among these generations were significant (P<0.05), favoring the selected generations over the base population. Estimates of genetic correlations between litter traits  were positively and ranged from low (0.06) between LSW and LWB  to moderate (0.51) between LWB and LW21. Genetic correlation between milk yield  traits at different periods of lactation ranged from low (0.19) between MY7 and MY28 to high (0.84) between MY21 and TMY , while negative correlation between MY7 and TMY (-0.29). The accumulative correlated selection responses were positively and significant for litter traits and milk traits, while neagative and significant  for MOR % , positive and non significant for MCR%. Conclusively, The selection of NZW does for litter size at birth could be efficient to improve litter traits and milk yield traits

DOI

10.21608/epsj.2020.114314

Keywords

correlated response, Contrast, litter traits, milk yield, heritability, selection

Authors

First Name

mahmoud

Last Name

El-Attrouny

MiddleName

mostafa

Affiliation

2Department of Animal Production, Faculty of Agriculture at Moshtohor, Benha University, Egypt

Email

mahmoud.elatrouny@fagr.bu.edu.eg

City

benha

Orcid

https://orcid.org/00

First Name

Walid

Last Name

Habashy

MiddleName

shabaan

Affiliation

Dept. of Anim. and Poult. Prod, Fac. of Agric., Damanhour Uni., Egypt

Email

walidh55@gmail.com

City

-

Orcid

-

Volume

40

Article Issue

3

Related Issue

17205

Issue Date

2020-09-01

Receive Date

2020-08-02

Publish Date

2020-09-01

Page Start

599

Page End

612

Print ISSN

1110-5623

Online ISSN

2090-0570

Link

https://epsj.journals.ekb.eg/article_114314.html

Detail API

https://epsj.journals.ekb.eg/service?article_code=114314

Order

2

Type

Original Article

Type Code

493

Publication Type

Journal

Publication Title

Egyptian Poultry Science Journal

Publication Link

https://epsj.journals.ekb.eg/

MainTitle

CORRELATED RESPONSE ON LITTER TRAITS AND MILK YIELD IN NEW ZELAND WHITE RABBITS SELECTED FOR LITTER SIZE AT BIRTH

Details

Type

Article

Created At

22 Jan 2023