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

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

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.
 

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