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46502

EFFECT OF L-TYROSINE ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF NEW ZEALANDWHITE DOES RABBITS

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Last updated: 22 Jan 2023

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Abstract

This study investigated the effect of L-Tyrosine according to the age at administration on some productive and reproductive performance of female New Zealand White (NZW) rabbits.  Sixty five young does were distributed randomly into five equal groups in a completely random design included four levels of L-tyrosine according to the age of does at administration. The first group was served as a control, while the second (T1) was given a single dose of L-tyrosine(100 mg/kg BW) at the second month of age, the third group (T2) was given two doses at 2 and at 4 months of age, the fourth group (T3) was given three doses at 2, 4 and at 6 months of age and the fifth group (T4) was given four doses at 2, 4, 6, and at 8 months of age.
 The results showed the effect of L-tyrosine treatments on sexual receptivity and the conception rates was significant (P ≤ 0.05) and (P ≤ 0.01) respectively. The highest receptivity rate was 92.86% in T1 group. The conception rate increased inT1 group was 93.39%.  Also L-tyrosine treatments affected significantly (P≤0.05) on kindling intervals (days) and economic efficiency. The shortest kindling interval was in T1 group (41.75 days).T1 group was the best in economic efficiency. Also L-tyrosine affected significantly (P≤0.05) on average total litter size and their weights at birth and at weaning where T1 gave the highest litter size.
In conclusion, the single dose of L-tyrosine at two months of age in NZW rabbits enhanced the receptivity rate, conception rate, total litter size and their weights at birth and at weaning.
 

DOI

10.21608/ejrs.2018.46502

Keywords

Rabbits, L-tyrosine, reproductive, litter size, mortality

Authors

First Name

Mohamed

Last Name

Loutfi

MiddleName

-

Affiliation

Department of Poultry Nutrition, Animal Production Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.

Email

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City

ARC, Giza

Orcid

-

First Name

Hasan

Last Name

Khalil

MiddleName

-

Affiliation

Department of Poultry Nutrition, Animal Production Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.

Email

-

City

Seuz Canal Univer.

Orcid

-

First Name

Ibrahim

Last Name

Assaf

MiddleName

-

Affiliation

Department of Poultry Nutrition, Animal Production Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.

Email

dr.asssaf2007@yahoo.com

City

ARC,Giza

Orcid

-

First Name

Mostafa

Last Name

Ayoub

MiddleName

-

Affiliation

Department of Animal Production, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt.

Email

-

City

Suez Canal University, Ismailia

Orcid

-

Volume

28

Article Issue

1

Related Issue

6843

Issue Date

2018-01-01

Receive Date

2017-08-30

Publish Date

2018-01-01

Page Start

115

Page End

128

Print ISSN

1110-2594

Online ISSN

2682-3330

Article File

EJRS_Volume 28_Issue 1_Pages 115-128.pdf

PDF . 410.5kB

Link

https://ejrs.journals.ekb.eg/article_46502.html

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https://ejrs.journals.ekb.eg/service?article_code=46502

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Original Article

Type Code

868

Publication Type

Journal

Publication Title

Egyptian Journal of Rabbit Science

Publication Link

https://ejrs.journals.ekb.eg/

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Article

Created At

22 Jan 2023