World Rabbit Science - Vol. 18 (2)-2010

Tabla de contenidos

Diet digestibility in growing rabbits: effect of origin and oxidation level of dietary fat and vitamin e supplementation.
Evaluation of the anticoccidial efficacy of Cycostat® in experimentally infected breeding rabbits housed under conventional conditions.
Milk production of pseudopregnant multiparous does.
Detection of plant species-specific dna (barley and soybean) in blood, muscle tissue, organs and gastrointestinal contents of rabbit.
Maternal behaviour in peripartum influences preweaning kit mortality in cage-bred wild rabbits.
Haematological and biochemical observations in four pure breeds of rabbits and their crosses under Egyptian environmental conditions.
Descriptive characterization of a nigerian heterogeneous rabbit population - factors affecting litter traits.

URI permanente para esta colecciónhttps://riunet.upv.es/handle/10251/8717

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Access status: Abierto ,
Descriptive characterization of a Nigerian heterogeneous rabbit population - factors affecting litter traits
(World Rabbit Science. ICTA. UPV, 2010) Oseni, S.O.; Ajayi, B.A.; International Foundation for Science, Suecia
[EN] This study evaluated the effect of female body weight at conception (FWC), season of mating (SM), type of mating (TM) and litter size at birth (LSB) on the litter performance in a heterogeneous Nigerian population of rabbits. Data on 116 litters from 10 bucks and 48 does across three parities were analysed. Reproductive traits evaluated included LSB, number born alive (NBA), litter sizes and weights at 7, 14 and 21 d post-kindling, pre-weaning survival rate (SR) and daily weight gain of kits from kindling to weaning (DWG). A fi xed linear model that included FWC (light and heavy does), TM (homospermic and heterospermic matings), LSB classes (low, medium and large) and SM (rainy or dry) was used. Results showed that heavier does at concenption showed higher performance for LSB and NBA (P<0.05) than lighter does. Average weight of kits at kindling and at 28 d, as well as kit SR and DWG, were signifi cantly higher in low-sized litters, when compared with intermediate- and large-sized litters (P<0.05). LSB, NBA and litter size at weaning were higher in litters produced by heterospermically mated does compared with homospermically mated does. Season of mating affected LSB and NBA (P<0.05), being signifi cantly larger the litters in the rainy season.
Access status: Abierto ,
Haematological and biochemical observations in four pure breeds of rabbits and their crosses under Egyptian environmental conditions
(World Rabbit Science. ICTA. UPV, 2010) Abdel-Azeem, A.S.; Abdel-Azim, A.M.; Darwish, A.A.; Omar, E.M.
The present study was conducted to evaluate 16 crosses between 4 breeds of rabbits from a physiological point of view. The breeds tested were Baladi Red (BR), Chinchilla Giganta (ChG), French Giant Papillon (FGP) and Simenwar (S). A total number of 6144 blood samples were collected to detect the effect of crossing, age of kits, month of kindling and sex effects. The traits evaluated were: haematological parameters; red blood cell count (RBCs), haemoglobin concentration (Hb), haematocrit value (Ht%), biochemical parameters of plasma; total protein (TP), albumin (Alb), globulin concentration (Glo), albumin/globulin ratio (Alb/Glo) and triglycerides (TG). BR or its crosses, using BR sires or BR dams, showed the highest value of RBCs, Hb and Ht%. Crossbred rabbits obtained from mating BR and FGP rabbits had the highest Glo values. Rabbits which were born in May-June months had the highest values of TP and its fractions (Alb and Glo). Age of kits had a highly significant effect (P<0.001) on RBCs, Hb, Ht%, TP and TG. Moreover, Glo and Alb/Glo ratio (P<0.01) and Alb (P<0.05) were also significantly affected. Sex had no significant effect on all studied parameters. Significant positive correlations were found between TP and each final body weight, total weight gain, total feed intake, carcass weight and dressing percentage, while significant negative correlation was found with feed conversion.
Access status: Abierto ,
Maternal behaviour in peripartum influences preweaning kit mortality in cage-bred wild rabbits
(World Rabbit Science. ICTA. UPV, 2010) González-Redondo, P.
This study describes and models maternal nest-building and parturition behaviour in cage-bred wild rabbits (oryctolagus cuniculus), and its influence on the kits' pre-weaning mortality. In a total of 91 litters, perinatal mortality was 33%; mortality during the nursing period was 16.05%, and therefore the accumulated mortality up to weaning was 43.94%. These mortality rates, higher than those described in the literature among domestic breeds, were linked to failures in maternal behaviour. Such failures included the non-introduction of straw into the nest box (41.8% of births), a lack of hair lining in the nest (28.6%), births in which one or all of the kits were born outside the nest box (18.7%), and births in which one or all of the kits were cannibalised by the doe (13.2%). Maternal behaviour in relation to the kits' viability was modelled by performing multiple correspondence and cluster analyses with two dimensions and a 67.2% total inertia. The first dimension (inertia: 0.400) was represented by the presence of hair in the nest box; the place where the kits were born (inside or outside the nest box), and the doe's previous experience (primiparous or multiparous), while the total number of kits born represents the second dimension (inertia: 0.272). Three maternal behaviour types were identified: types 1 and 3 representing births in which the failure of maternal behaviour at kindling led to high kit mortality. Maternal behaviour type 1 corresponds to primiparous does of parity orders 1 and 2 with a high number of total kits born and of stillborn kits. Type 3 births were characterised by all of the kits died during peripartum, with a high incidence of cannibalism. Type 2 included births of experienced does showing successful development of maternal behaviour, as well as high kits' survival rates during the peripartum and nursing periods. Although wild rabbits are subject to the same modulating factors in the development of the maternal repertoire as domestic does, showed a lower preweaning viability due to the failure to display maternal behaviour during peripartum
Access status: Abierto ,
Detection of plant species-specific dna (barley and soybean) in blood, muscle tissue, organs and gastrointestinal contents of rabbit
(World Rabbit Science. ICTA. UPV, 2010) Tudisco, R.; Calabrò, S.; Bovera, F.; Cutrignelli, M.J.; Nizza, A.; Piccolo, V.; Infascelli, F.
The aim of this study was to detect plant DNA sequences from low copy number genes of barley grain and soybean meal, the latter being subjected to solvent extraction process, in blood, liver, kidney, spleen, muscle tissue and digesta (duodenum, caecum and faeces from rectal ampulla) of rabbits. For fattening, Hyla rabbits (20 males and 20 females) were fed a diet including barley grain (15%) and soybean meal (12%). Animals were slaughtered at 74 d of age (2 ± 0.2 kg live weight) and samples collected from each animal. The quality of each DNA sample was verified using the UNIV P/Q primers used to amplify a mammalian specifi c portion of mtDNA 16S rRNA gene. The presence of plant DNA was subsequently ascertained on the same DNA samples, as well as on barley and soybean (control). Two classes of plant DNA sequences were monitored via real-time PCR, using SYBR(R) Green I Dye: a high copy number chloroplast gene (trnl) and a low copy number specific for barley (metal-dependent hydrolase-like protein) and soybean (lectin) genes. Melting curve analysis was used to identify the PCR products. The chloroplast fragment detection frequency was higher (P<0.01) in muscle (90%), liver (80%), kidney (80%) and spleen (80%) than in blood (40%) and digesta samples. In the latter, chloroplast DNA was found in 40 and 30% of duodenum and caecum contents respectively, and in 30% of faeces. The specificity of the amplicons obtained was checked by sequencing and annotation. In the samples positive for chloroplast fragments, the frequency of detection of barley specific sequence was higher (P<0.01) in liver (62.5%), kidney (62.5%), spleen (62.5%) and digesta (100%) than in blood (25%) and muscle (22.2%) samples. The soybean lectin gene was not detected in animal samples, although it was seen in plant samples. Results confirm that, except for gastrointestinal tract (GIT), plant single copy genes are more difficult to identify in animal samples.
Access status: Abierto ,
Milk production of pseudopregnant multiparous does
(World Rabbit Science. ICTA. UPV, 2010) Szendrö, Zs.; Matics, Zs.; Brecchia, G.; Theau-Clément, M.; Nagy, Z.; Princz, Z.; Biró-Németh, E.; Radnai, I.; Nagy, I.
The aim of the experiment was to evaluate the milk production of pseudopregnant does. In this experiment, data of multiparous, inseminated, pregnant (IP, n=15) does and two groups of presumably pseudopregnant multiparous does: inseminated, non-pregnant (INP, n=17) and induced to ovulation by GnRH (1.5 microgram per animal) at the day of insemination (11 d after parturition) (non-inseminated, ovulating: NIO, n=15) were analysed. The progesterone level was measured at the 12th d after treatment to determine if females were pseudopregnant. All IP and NIO does were pregnant and pseudopregnant, respectively. Within the INP group, 10 and 7 does were diagnosed as positive (INPO) or negative (INPNO) for pseudopregnancy. Two of the INPNO does perished during lactation. The average milk production of groups IP, INP and NIO was 212, 92 and 72 g/d, respectively (P<0.001). The proportion of rabbit does reaching daily milk yields of <10, 10-50, 50-100, 100-160, >160 g in the various groups were: IP=0, 0, 0, 0 and 100%, NIO=20, 13, 27, 40 and 0%, INP=15, 15, 15, 55 and 0%, respectively. The daily milk yield of the 5 INPNO does was 2, 6, 27, 84 and 139 g, respectively. These results demonstrated that multiparous empty does, pseudopregnant or non-pseudopregnant, can produce milk, but in lower quantities than multiparous does after kindling.
Access status: Abierto ,
Evaluation of the anticoccidial efficacy of Cycostat (R) in experimentally infected breeding rabbits housed under conventional conditions
(World Rabbit Science. ICTA. UPV, 2010) Maertens, L.; Van Gaver, D.
The present study was designed in order to evaluate the effi cacy and safety of Cycostat (R) 66G in the prevention and control of coccidiosis in breeding does after experimentally induced infection with common Eimeria spp. at the age of 18 wk. The inoculum was prepared based on faecal samples collected on farms in the Czech Republic. A total of 94 young and pregnant does were divided into 4 groups and enrolled in the study. The zootechnical, clinical and parasitological results of 2 control groups were compared, a non-infected non-treated (NI-NT) and an infected non-treated (I-NT), and 2 infected and dietary supplemented groups, with 50 (I-50) and 66 mg/kg (I-66) robenidine, respectively. Does in the I-NT group showed a significant drop in weight gain and feed intake during the fi rst 14 d after inoculation. No treatment related effects on the weight development of the does were observed, although does in the I-NT group always had approximately ± 200 g lower body weight. Litter size (live born) was not signifi cantly different at either the fi rst or second parturition and amounted to 9.0, 8.2, 10.1 and 9.8 (1st litter) and 11.3, 10.4, 10.1 and 11.0 (2nd litter) in NI-NT, I-NT, I-50 and I-66 does, respectively. At weaning, both in the 1st and 2nd cycle, the highest litter weight was obtained in the I-50 and I-66 groups. Litter weaning weight values for I-66 (litter 2) were higher but not significant (P=0.069) compared to the NI-NT litters. The lowest young mortality was also observed in the I-66 litters, both in the first and second cycles. Between 6 to 11 d after inoculation, the oocyst excretion of both supplemented groups was reduced by more than 90% in comparison to the I-NT. Supplementation with Cycostat (R) 66G diminished the excretion of E. flavescens and E. intestinalis, the most pathogenic species, by 100%. The excretion of E. magna was reduced by >90 and 100% for the I-50 and I-66 groups, respectively. The reduction in oocyst excretion of E. media was less pronounced. It was concluded that Cycostat (R) 66G supplemented in the feed at a concentration of 50 or 66mg/kg was able to prevent coccidiosis in breeding does after experimental inoculation.
Access status: Abierto ,
Diet digestibility in growing rabbits: effect of origin and oxidation level of dietary fat and vitamin e supplementation
(World Rabbit Science. ICTA. UPV, 2010) Casado, C.; Moya, V.J.; Fernández, C.; Pascual Amorós, Juan José; Blas, E.; Cervera, C.; Departamento de Ciencia Animal; Instituto Universitario de Ciencia y Tecnología Animal; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Ministerio de Ciencia y Tecnología
[EN] The effects of the dietary inclusion of fats with different origin (lard or vegetal oil), fatty acid profile (linseed or sunflower), oxidation level (fresh, peroxidised: 11 d at 55ºC or oxidised: 31 h at 140ºC) and vitamin E supplementation (0 or 100 ppm) on the rabbit diet apparent digestibility were studied. Digestibility coefficients of dry matter, organic matter, crude protein, ether extract and gross energy were determined in eight diets using 58 rabbits aged 49 d. Contrast analysis between groups of diets showed that lard, characterised by a greater saturated fatty acid content, compared with vegetal oils, rich in unsaturated fatty acid, reduced the apparent digestibility of ether extract (62.3 vs. 68.4%; P=0.0329). However, there were no significant differences in the nutrient digestibility when linseed or sunflower oils (rich in [omega]-3 or in [omega]-6 polyunsaturated fatty acids, respectively) were compared. The oxidation degree of the sunflower oil and the supplementation with 100 ppm of vitamin E to the diets did not modify the apparent digestibility values of any dietary fraction.

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