World Rabbit Science - Vol. 01 (4)-1993

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EMBRYO RECOVERY UNDER ANAESTHESIA AFTER hCG OR GnRH TREATMENTS IN THE RABBIT AND SURVIVAL WHEN A REDUCED NUMBER OF EMBRYOS IS TRANSFERRED
THE EFFECT OF INFRA-RED RADIATION ON RECTAL, SKIN AND HAIR-TIP TEMPERATURES OF RABBITS.
CASSAVA AS NEW ANIMAL FEED IN EGYPT 3 - PELLETED COMPLETE CASSAVA FEED FOR GROWING RABBITS.
DIVERSITY OF REPEATABILITY BETWEEN PARITIES FOR LITTER TRAITS AND REPRODUCTIVE INTERVALS IN DOE RABBITS.
RECHERCHES SUR L'INTERACTION ENTRE ALIMENTATION, REPRODUCTION ET LACTATION CHEZ LA LAPINE, UNE REVUE

URI permanente para esta colecciónhttps://riunet.upv.es/handle/10251/10386

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EMBRYO RECOVERY UNDER ANAESTHESIA AFTER hCG OR GnRH TREATMENTS IN THE RABBIT AND SURVIVAL WHEN A REDUCED NUMBER OF EMBRYOS IS TRANSFERRED
(World Rabbit Science. ICTA. UPV, 1993) LOPEZ, Marina; FORCADA, F.; RODRIGUEZ, J.A.; MARTIN, Maria; ZARAGAZA, L.; Universidad de Zaragoza
[EN] Ovulation rate and number of 72h post-mating recovered embryos were studied in nulliparous Spanish Giant does treated with an intravenous injection of 25 IU hCG (n=22) or 20 μg GnRH (n=20) intramuscularly after coitus. Embryos were recovered under anaesthesia by separata perfusion of the oviducts and uteri. One of the GnRH-treated does did not ovulate. No significant differences between groups were found either in the ovulation rate or in the number on recovered embryos per donor doe (8.5 ± 0.2 and 7.3 ± 0.2 vs 8.6 ± 0.4 and 6.8 ± 0.9 respectively for hCG and GnRH treated animals). After transfer into the uteri of synchronized Solaf commercial hybrid recipients, the lower number of embryos transferred per doe (5.9 vs 11.2) did not affect to the percentage of pregnant does (67 vs 75 o/o respectively), but increased the percentage of young born per pregnant doe (59 vs 41 o/o respectively) (P<0.05). Plasma progesterone levels in the recipients were higher in pregnant does (at least P<0.05) from Day 9 post-mating to the last blood sample recovered (Day 21), although the progesterone pattern in the non-pregnant ones indicated that the induction of ovulation was effective. The results indicate the adequate embryo recovery rates obtained from Spanish Giant does under anaesthesia and the good efficiency after transfer of a reduced number of embryos per recipient doe.
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DIVERSITY OF REPEATABILITY BETWEEN PARITIES FOR LITTER TRAITS AND REPRODUCTIVE INTERVALS IN DOE RABBITS
(World Rabbit Science. ICTA. UPV, 1993) Khalil, M.H.
[EN] An experiment was carried out to determine the genetic variation in litter traits and reproductiva intervals between different parities in New Zealand White (NZW) and Californian (CAL) rabbits. Data on 581 litters produced by 163 does mated to 43 bucks of NZW and CAL rabbits were involved. A linear mixed model included the effects of service buck and does within service buck (as random effects) and year-season and parity (as fixed effects) was used for analysing such data. NZW breed had higher litter size, weight and gain along with a lower number of stillbirths and preweaning litter mortality relativa to CAL breed. Reproductiva intervals and number of services per conception of NZW rabbits were relatively lower than in CAL rabbits. Periods of reproductiva intervals were short in both breeds (42-43 days from a kindling to another) and they are one of the encouraging factors for the effective use of these two standard breeds on a large scale of commercial production in Egypt. Phenotypic variation in all litter traits and reproductiva intervals for both breeds was high. Year-season affected significantly most reproductiva intervals and litter traits studied. Litters kindled in spring generally had the smallest litter size and lightest litter weight and gain along with the shortest reproductiva intervals comparad to litters kindled in autumn and winter seasons. Reproductiva intervals in both breeds had a quadratic relationship with parity. Service buck had little or no effect on litter traits and reproductiva intervals. Percentage of variation attributed to the service-buck effect were generally higher in NZW breed than in CAL, while the reverse was observad for doe effect. Repeatabilities across all parities of most litter traits and reproductiva intervals in both breeds were low and ranged from O.O to 0.21 . Repeatabilities for all traits in NZW were similar to those in CAL. For both breeds, repeatabilities of doe traits for first and second parities were generally slightly higher than for second and third parities.
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THE EFFECT OF INFRA-RED RADIATION ON RECTAL, SKIN AND HAIR-TIP TEMPERATURES OF RABBITS
(World Rabbit Science. ICTA. UPV, 1993) Kasa, I.W.; Thwaites, C.J.
[EN] An experiment was conducted on the effect of infra-red (i.r.) radiation on female NZ>/11 rabbits. A 4x3x6 factorial design was employed in which the factors were : 4 intensities of i.r. radiant heating of O.O, 1.9, 2.1, 2.4 MJ/m2/h ; 3 replicates and 6 rabbits. All animals were watered and fed a standard ration ad libitum. Rectal temperaturas differed (P<0.001) between treatments and were highest at the "high" level of i.r. radiation (1 ºC higher than far controls). At the "medium" and "low" levels of i.r. heating RT's were respectively 0.3º and 0.2ºC higher than in controls. In different i.r. treatments skin temperatura (ST) was significantly different (P<0.001), being highest at the "high" i.r. level, with values of 42.8 ± 0.5ºC. Under the "low" and "medium" levels, corresponding ST values were 37.8 ± 2.1 and 39.5 ± 3.0ºC, respectively. Skin temperatura differed with time of exposure (P<0.001), increased most rapidly (by 5.9ºC) in the first 20 minutes, but only by a further 0.8ºC in the subsequent 40 minutes. Between different level or i.r., hair-tip temperatura (HTT) was significantly different (P<0.001), values being highest under the "high" i.r. treatment. Comparad to controls, exposure to the "low", "medium" and "high" i.r. levels increased HTT by factors of 1.1, 1.3 and 1.6 respectively. Between different times of exposure, HTT also differed significantly (P<0.001) with most of this effect being in the first 20 minutes (a 1.6 fold increase). During the second 20-minutes interval a further significant increase was recordad, but of only 0.6ºC. From the above results it can be concluded that the higher the level of i.r. heating, the more stressed the animals was.
Access status: Abierto ,
RECHERCHES SUR L'INTERACTION ENTRE ALIMENTATION, REPRODUCTION ET LACTATION CHEZ LA LAPINE, UNE REVUE
(World Rabbit Science. ICTA. UPV, 1993) Parigi-Bini, R.; Xiccatto, G.
[EN] The rabbit doe, at the beginning of its reproductiva activity (first pregnancy first lactation or first" concurrent pregnancy and lactation), hás a negativa energy and material balance. The net body composition at the first parturition changes definitely during lactation, with an important loss of lipids (about - 40 %) and energy (- 20 %). lf the rabbit doe is concurrently pregnant, the energy deficit becomes greater and the nitrogen and mineral balances become negativa as well. Consequently the second kindling litter size is lower, (- 10 % of total youngs born and - 20 % of rabbits born alive). Moreover, the composition of new born pups shows a lower lipid content which can influences negatively their viability. The energy and nitrogen requirements for maintenance, and the coefficients of utilization of digestible energy (DE) and digestible proteins (DP) for milk energy and protein production are given. In the case of a negativa balance, the coefficients of utilization of body energy and protein for milk production are also reportad. The author's research had also the object of studying the effect of the diet on the reproductiva performance of does. In particular, the increase of energy intake due to diets supplemented with fat causes an increase of milk production, which is favourable for the litter but does not reduce the maternal energy deficit. In addition, the number of pups born alive at the second parturition is negatively affected. A single "feeding strategy" is not able to solve the problem of nutritiva deficit or avoid the unwanted effects of the concurrent pregnancy and lactation. Therefore we have to operate at breeding level, programming a less intensiva remating system, reducing the number of suckling youngs and preparing the future reproducing does from their weaning.
Access status: Abierto ,
CASSAVA AS NEW ANIMAL FEED IN EGYPT 3 - PELLETED COMPLETE CASSAVA FEED FOR GROWING RABBITS
(World Rabbit Science. ICTA. UPV, 1993) Abd El-Baki, S.M.; Nowar, M.S.; Bassuny, S.M.; Hassona, E.; Soliman, E.S.
[EN] Forty New Zealand White rabbits (20 males and 20 females) aged 5 weeks, of 735g in average weight, were divided into two groups on basis of weight and sex. A pelleted complete rabbit feed containing 45 % cassava products (CCF diet) as 30 % root meal + 15 % leaf meal, was formulated to be fed in comparison with a commercial feed (AF diet ; Atmida Cº) during the 15 weeks of experiment, divided in 3 stages of 5 weeks. 1 % urea was added to the CCF diet in arder to increase the N-content. The results indicated that CP digestibility and N-balance of CCF were significantly (P<0.05) lower than that in AF diet in the first 5 weeks after weaning (1st stage). But the CP digestibility and N-balance were not significantly different between two Qroups fed CCF and AF diets at 15 weeks after weaning (3rá stage). The CF digestibility was not significantly affected by type of feed and it was improved by advance in age of rabbits fed CCF or AF diets. In contrast N-balance was decreased with advancing of age of two groups of growing rabbits. No significant effect of sex was observed on digestibility or N-balance. The feed intake was significantly (P<0.01) lower with CCF diet than that with AF diet in 1 st and 2nd stages. Daily body gain was significantly (P<0.01) lower with rabbits fed CCF than those fed AF diets in 1 st stage but it was nearly similar between two groups at 2nd and 3rd stages. Feed conversion (feed/gain) was more efficient with rabbits fed AF than those fed CCF diets at 1 st stage but opposite trend was observed in 2nd and 3rd stages of growth. Slaughter and carcass traits showed no significant differences between the two groups fed CCF and AF diets. There were no significant differences in feed intake, feed conversion and daily body gain between male and female rabbits. Conclusively, it could be appear that cassava products (roots and leaves) can be used satisfactorily as the partial substitute for traditional energy and protein supplements to formulating pelleted diet for growing rabbits.

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