| Titles |
|
English :
|
Studies on some productive traits in rabbits.
|
|
Arabic :
|
دراسة على بعض الصفات الانتاجية في الارانب.
|
|
| Abstract |
This study was carried out in Gizereit EI-Sheir Exper-imental station at EI-Kanater EI-Khairia, that belongs to the Animal Production Research Institute, Agricultural Research Center,Ministry of Agriculture at Dokki, Egypt.Data were collected on 1966 purebred progeny of Baladi Red (548), Baus-cat (620) and New Zealand White (798) rabbits produced during two consecutive years of production (1985/1986 1986/1987)to investigate some genetic and non-genetic effects on weaning and post weaning body weights up 16 to weeks of age daily gain from weaning up to 16 weeks of age during different age intervals (4-8, 8-10, 10-12, 12-14,14-16 and 4-16weeks),post weaning viability post in rabbits up to different
ages till 16 weeks and carcass traits of rabbits of the three breeds slaughtered at 12 and 16 weeks of age.
Body weight:
Dam effects contributed significantly (P<0.01 or P<0.001)in the variance of body weight at different ages from weaning up to 16 weeks. Year-of-birth effects body weight were significant on (P<0.05, P<00, P<0.00l or P<0.0001) at some ages and non-significant in others.
Body weight of rabbits varied with month of birth at all ages but without any definable trend the differences were generally significant (P<0.05 or P<0.01) in the three breeds.
Body weight of rabbits varied from parity to another but did not show any consistent pattern, the differences were significant (P<0.05 or P<0.001) at all ages studied in Baus-cat and New Zealand White rabbits and mostly so in Baladi Red.
Litter size at birth, constituted a significant (P<0.05 or P<0.01) source of variance in body weight of rabbits at all ages studied. Sex differences in body weight at all ages of the study were in favour of females but were small and non-significant. Body weights at different ages varied significantly (P<0.01 or P<0.001 or P<0.0001) with breed, Bauscat rabbits always excelled the other two breeds.
Daily gain:
Changes in the average daily gain with advance of post-weaning age intervals up to 16 weeks did not show similar trend in the three breeds of the study.
Dam effects contributed significantly (P<0.05, P<0.01, P<0.001 or P<0.0001) to average daily gain from weaning up to 16 weeks of age.
Average post-weaning daily gain during different age intervals varied with year-of-birth effects, the differences were significant in some age intervals and non-significant in others.
Average post-weaning daily gain varied with month of birth, parity and litter size at birth but without definable trend, the differences were significant (P<0.05, P<0.01, P<0.001 or P<0.0001) during some age intervals and non-significant during others.
Sex differences in post weaning daily gain during different age intervals were" in favour of females but were limited and non-significant.
Average post-weaning daily gain during different age intervals from weaning up to 16 weeks varied with breed group significantly (P<0.05, P<0.01 or P<0.0001), Bauscat rabbits showed the best performance.
Post-weaning viability:
Post-weaning viability of rabbits decreased as age advanced.
post-weaning viability of young rabbits up to 16 weeks was significantly (P<0.001 or P<0.0001) influenced by their dams'' effects.
Year differences in post-weaning viability were generally significant (P<0.01, P<0.001 or P<0.0001).
Month-of-birth effects on post-weaning viability were significant (P<0.01, P<0.001 or P<0.0001), but without any definable pattern.
Parity effects on post-weaning viability showed no definable trend and were non-significant.
Female rabbits recorded higher post weaning viability than males up to all ages studied but the differences were small and non-significant. Differences in viability due to breed effects were significant (P<0.0l or p<0.00l) up to ten, 12 and 14 weeks of age; New Zealand White rabbits were the most viable as compared with the other two breeds.
Carcass traits:
Estimates of the means showed that the averages of all carcass traits increased as age advanced except that of dressing percentage.
Carcass traits when measured at 12 and 16 weeks of age varied with year of birth, the differences were in favour of rabbits born in the first year (1985/86). The differences were significant (P<0.05or P<0.01or P<0.001) for some traits and non-significant for others at both ages.
Carcass traits varied with month of birth and parity, the differences significant(P<0.05,P<0.01,P<0.001 or P<0.0001) in some traits and non-significant in others at both ages.
Carcass traits varied with sex, but the differences at both 12 and 16 weeks of age were mostly non-significant.
Bauscat rabbits recorded the heaviest fasted weight while Baladi Red gave the heaviest carcass weight and highest dressing percent both at the two ages (12 and 16 weeks of age) .
Carcass traits varied with breed, the differences were significant (P<0.05 or P<0.01or P<0.001 or P<0.0001) in dressing percent as well as in weights of carcass, front part, shoulder, chest, spleen, head, blood, stomach, intestine+caecum, tail and bladder at 12 weeks of age, in weights of non-empty carcass as well as loin, lungs and kidneys at 16 weeks of age and in fasted weight as well as weights of liver, heart and feet at both 12 and 16 weeks.
A positive significant (P<0.001 or P<0.000l) linear association between body weight at slaughter and carcass traits was observed.
|
| Publication year |
1992
|
| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
|
| Availability number |
383
|
| Organization Name |
Rabbit, Turkey and Water Fowl Research Department
|
| Country |
Egypt
|
| Department |
Rabbit, Turkey and Water Fowl Research Department
|
| Author(s) from ARC |
|
| Agris Categories |
Animal feeding
|
AGROVOC
TERMS |
Carcass composition.
Production factors.
Rabbits.
|
| Publication Type |
Master Thesis
|