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46508

EFFECT OF L-TYROSINE ADMINISTRATION ON MILK YIELD AND SOME BLOOD PARAMETERS IN NEW ZEALAND WHITE RABBITS DOES

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Last updated: 22 Jan 2023

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Abstract

Sixty five young New Zealand White (NZW) does were distributed randomly into five equal groups in a completely randomized design included four intervals doses of L-tyrosine administration according to the age at administration. The first group  was served as a control (no treatment), while the second group (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) group was given four doses at 2, 4, 6, and at 8 months of age.
The results showed that L-tyrosine administration increased significantly (P≤0.05) the weeklymilk yield in the treated groups than in control group. L-tyrosine affected significantly (P ≤ 0.05) the concentration of estradiol hormone (E2) at 10 months of age and progesterone hormone (P4) at all ages. T1 group was higher than the other groups. Meanwhile L-tyrosine treatments did not affect on concentration of triiodothyronine (T3), total lipids, total protein, albumin, globulin and albumin/globulin (A/G) ratio at 5 and 10 months of age.  
In conclusion, effect of L-tyrosine administration (100 mg/kg LBW) at two months of age increased total milk yield production and improved sexual hormones P4 and E2 release significantly.
 

DOI

10.21608/ejrs.2018.46508

Keywords

Rabbits does, L-tyrosine, New Zealand, milk yield, blood parameters

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

mostafa

Last Name

Ayoub

MiddleName

-

Affiliation

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

Email

-

City

Suez Canal University

Orcid

-

First Name

hasan

Last Name

Khalil

MiddleName

-

Affiliation

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

Email

-

City

Suez Canal University

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

-

Volume

28

Article Issue

1

Related Issue

6843

Issue Date

2018-01-01

Receive Date

2017-09-14

Publish Date

2018-01-01

Page Start

157

Page End

171

Print ISSN

1110-2594

Online ISSN

2682-3330

Article File

EJRS_Volume 28_Issue 1_Pages 157-171.pdf

PDF . 474.4kB

Link

https://ejrs.journals.ekb.eg/article_46508.html

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https://ejrs.journals.ekb.eg/service?article_code=46508

Order

8

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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