EFFECT OF L-TYROSINE ADMINISTRATION ON MILK YIELD AND SOME BLOOD PARAMETERS IN NEW ZEALAND WHITE RABBITS DOES
Loutfi, M., Ayoub, M., Khalil, H., Assaf, I. (2018). EFFECT OF L-TYROSINE ADMINISTRATION ON MILK YIELD AND SOME BLOOD PARAMETERS IN NEW ZEALAND WHITE RABBITS DOES. EKB Journal Management System, 28(1), 157-171. doi: 10.21608/ejrs.2018.46508
Mohamed Loutfi; mostafa Ayoub; hasan Khalil; Ibrahim Assaf. "EFFECT OF L-TYROSINE ADMINISTRATION ON MILK YIELD AND SOME BLOOD PARAMETERS IN NEW ZEALAND WHITE RABBITS DOES". EKB Journal Management System, 28, 1, 2018, 157-171. doi: 10.21608/ejrs.2018.46508
Loutfi, M., Ayoub, M., Khalil, H., Assaf, I. (2018). 'EFFECT OF L-TYROSINE ADMINISTRATION ON MILK YIELD AND SOME BLOOD PARAMETERS IN NEW ZEALAND WHITE RABBITS DOES', EKB Journal Management System, 28(1), pp. 157-171. doi: 10.21608/ejrs.2018.46508
Loutfi, M., Ayoub, M., Khalil, H., Assaf, I. EFFECT OF L-TYROSINE ADMINISTRATION ON MILK YIELD AND SOME BLOOD PARAMETERS IN NEW ZEALAND WHITE RABBITS DOES. EKB Journal Management System, 2018; 28(1): 157-171. doi: 10.21608/ejrs.2018.46508

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

Egyptian Journal of Rabbit Science
Article 8, Volume 28, Issue 1, January 2018, Page 157-171  XML PDF (463.24 K)
Document Type: Original Article
DOI: 10.21608/ejrs.2018.46508
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Authors
Mohamed Loutfi* 1; mostafa Ayoub2; hasan Khalil2; Ibrahim Assaf1
1Department of Poultry Nutrition, Animal Production Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.
2Department of Animal Production, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt.
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.
 
Keywords
Rabbits does; L-tyrosine; New Zealand; milk yield; blood parameters
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