EFFECT OF L. YROSINE ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE IF FEMALE NEWZEALAND RABBITS | ||
| Veterinary Medical Journal (Giza) | ||
| Volume 53, Issue 2, April 2005, Pages 381-394 PDF (5.54 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/vmjg.2005.384717 | ||
| Authors | ||
| M OMARA* 1; S MAHMOUD2; M SAAD2 | ||
| 1Animal Prod. Res. Inst. Agric, Res, Center, Giza, Egypt | ||
| 2Dept. Of Physiology, Fac, Vet. Med, Kafr El-Sheik, Tanta Univ. | ||
| Abstract | ||
| This study is a trial to induce early puberty in immature female rabbits using L. tyrosine as oral supplementation. A total number of thirty-six immature female rabbits were used. Twenty- three ;of them were administered an oral dose of 100 mg/ kg body wt. L. tyrosine at the beginning of the third month age. A second similar oral dose was administered to ten of the administered group after one month from the first dose. Weekly body Weight and blood samples were taken. At the end of the 3rd and 4th months age, three females from each group were slaughtered, ovaries and liver 1 Were exteriorized and gonadosomatic index (OSI) and hepatosomatic index (HIS) were calculated.-Histological sections from ovaries were prepared. Serum T3, T4, oestradiol -17 fl (E2) and progeSterone were measured by radioimmunoassay. Females Were mated when they reach 2800 +100 gm b. wt. Conception rate and number and weight litters were recorded. The results revealed that, L. tyrosine supplementation resulted in significant increase in total body weight, OSI and serum T3, T4, E2 and progesterone. The elevation in progesterone was so late in relation to T3, T4 or E2. L. tyrosine also increased conception rate and the number of litters but the litter weights were significantly lowered. It is concluded that L. tyrosine can be effectively used to induce puberty and improve productivity in immature female rabbits as indicated by the increase in body weight, hormone levels, conception rate and number of litters at birth and their survival rate till one-month age. | ||
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