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

Document Type : Original Article

Authors

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

2 Department 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.
 

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