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[9000715.] رقم البحث : 9000715 - |
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Post-Weaning Body And Transverse Chest Length Measures / |
| تخصص البحث : General |
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Agricultural Research Journal Suez Canal University / / Volume 2 - 2003 |
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E.G Ahmed |
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Rabbit crossing, body length, transverse chest length, direct and maternal additive effect. |
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Data on 59! weaning rabbits which consists of 314 straight-bred and 277 cross-bred individuals,
produced through a crossbreeding experiment, from two breeds, one exotic, New-Zealand White (NZW)
and local breed. Baladi-Red (BR) as well as their reciprocal crosses. The study aimed at the evaluation of
the heterotic and crossbreeding effects (i.e. Additive Direct and Maternal) of biweekly progeny thigh
(hip) length (TL) and hind leg length (HL) measures from (weaning) at 6 weeks up to 12 weeks of age, as
well as the estimation of the non-genetic factors affecting these traits.
Effect of month of birth (MOB) on TL demonstrated significance at 8 and 10 weeks of age and
furthermore at 8,10 and 12 weeks of age for HL trait. Breed group affected significantly TL at 6 and 8
weeks of age whereas at 6, 8 and 12 weeks of age for HL measures. Feed type had significant effect on TL
and HL at 10 and 12 weeks of age. Parity affect was significant on HL trait at 10’11 week of age only.
Moreover, sex proved significant effect onlyfor HL trait at 6’11 week of age.
The results showed that average regression coefficients of the studied traits (i.e. TL and HL) on their
age respective hody weight (BW) were highly significant at all ages considered. as well as partial
regressions within BG at 8 weeks of age for TL and at 10 weeks of age for HL. However, the partial
regressions on Utter size at birth (LSB) affected significantly HL at 8’h week of age.
The positive and significant ’effects were detected for Values of direct heterosis (H’) at 8’h week of age
for TL measures. Positive Direct additive effects for NZW was shown at 8, 10 and 12 weeks of age for TL,
though significance was detected merely at 8 weeks of age whilst were significantly negative at 6, 8 and
12 weeks of age for HL. Maternal NZW additive effect (Gm) on TL and HL measures was positive at 6 and
12 weeks of age for TL and 6, 8 and la weeks of age for HL measures. However significant Gm effects
were detected at the 6 and 8 weeks of age for TL meanwhile at 6, 8 and 10 weeks of age for HL. |
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