| Titles |
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English :
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Effect of different mating systems on reproductive and productive efficiency of rabbits.
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Arabic :
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تأثير النظم المختلفة للتلقيح على الاداء التناسلى و الانتاجى في الارانب.
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| Abstract |
This work was carried out during the period from October 1992 to
the end of August 1993 in the rabbitry of El-Kanater Research Station of
the Agriculture Research Center, Ministry of Agriculture. The laboratory
work was conducted in the Animal Physiology Research Lab., Animal
Production Department, Faculty of Agriculture, Cairo University, Giza,
Egypt.
Twenty four does of each NZW and Ca1. rabbits weighing 3.0 - 4.0 Kg and aging 7 - 8 months were used in this experiment. After the 1st parity the does were divided according to post-partum (P.P.) period of remating into 3 groups. Those in Group 1 were mated on the 1st day P.P., females in Group 2 and 3 were mated on the 7th and the 28 days P.P., respectively.
Reproductive and productive performance were determined with the next 3 concequtie parities (2nd, 3rd and 4th) for each 6''TouP.
The results revealed the following findings:
* The highest conception rate (C.R.) was observed in does mated at the 1st day P.P. (Ml), followed by the does mated at 28 days P.P. (M3) and the least C.R. was found in does mated at 7th days P.P. (M2). The differences due to remating interval ( R.l.) were significant.
-The average of C .R. of Cal. does was significantly higher than NZW does.
-The differences due to parity in C.R. were significant.
* Reducing mating interval after parturition was associated with the
highest number of services per conception. However the differences among treatments were not significant.
- The number of services per conception were higher in NZW than Cal.
rabbits.
-The number of services per conception was found to be unaffected by parity in two breeds.
* The average length of the gestation period (G. P.) was found to be unaffected by remating interval period and breed.
* Does mated on the 1st day P.P. produced significantly greater number of litters than that mated later, in the two breeds.
-Cal. does recorded higher number of litters than NZW does.
* The average litter size at birth (L.S.B.) was higher in does mated on the
1st day P.P., however not significantly defferent than in the case of later remating.
-The average of L.S.B. of Cal. was higher than that of NZW rabbits.
-The highest average of L.S.B. was observed in the 3rd parity followed by the 2nd and the 4th parity in the two breeds, but insignificantly.
* Progesterone concentration in blood plasma (ng /ml) was higher in the two cases of later remating intervals than in case of the early remating,
However the differences were not statistically significant.
- Plasma P4 concentration increased (P< 0.01) as litter size increased.
Level of P4 in plasma of NZW females was higher (p< 0.01) than that in Cal. females.
-Significant increase of P4 level in plasma was observed after coitus Until
the 7th days. The peak of hormone concentration was noticed at the 14th
day, then decreased significantly until the 21st day of pregnancy.
* Does mated on the 1st day P. P. gave greater litter size at weaning
(L.S.W.) than the other Groups, however with insignificant difference.
-The average L.S.W. was higher in Cal. than NZW rabbits.
-L.S.W. decreased with the advance of parity in the two breeds.
* The differences due to breed and R.I. for ST and PW.M. were significant.
* Litter and bunny weight at birth increased when the remating interval was delayed to 7 days P.P..
-Litter and bunny weight were higher in NZW than Cal. rabbits.
greater litter weight at weaning was noticed with does mated 7 days P.P.
* Litter and bunny weight at weaning and 8 weeks of age were higher in NZW than Cal..
* Single body weight of punnies was higher in case of later remating ( 7 &
28 days P.P.) than those of group one from 5 to 8 weeks of age.
* Dose mated just after parturition consumed more feed than that of does mated on the 7th and 28th day P.P..
* Feed conversion ratio in young rabbits was improved when the mating after parturition delayed in two breeds.
* The general outcome of the reproductive and productive performance, as marketable meat productive was better in case of early remating.
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| Publication year |
1996
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى - شارع نادى الصيد - الدقى - الجيزة
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| Availability number |
508
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| Organization Name |
Rabbit, Turkey and Water Fowl Research Department
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| Country |
Egypt
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| Department |
Rabbit, Turkey and Water Fowl Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Mating systems.
Performance testing.
Rabbits.
Reproductive performance.
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| Proposed Agrovoc |
productive efficiency ;reproductive efficiency ;
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| Publication Type |
Master Thesis
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