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RiuNet. Repositorio institucional de la Universitat de Valencia (98.058 recursos)

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World Rabbit Science

Mostrando recursos 81 - 100 de 1.030

  1. Use of high concentrations of carbon dioxide for stunning rabbits reared for meat production

    Dalmau, A.; Pallisera, J.; Pedernera, C.; Muñoz, I.; Carreras, R.; Casal, N.; Mainau, E.; Rodriguez, P.; Velarde, A.
    [EN] An investigation was performed to determine whether high concentrations of carbon dioxide (CO2) at 70-98% in atmospheric air are a suitable alternative for stunning rabbits compared to conventional approaches such as electronarcosis. Aversion to the gas and efficacy in causing prolonged unconsciousness and death were studied in a total of 480 rabbits by means of behavioural parameters, physiological indicators (presence of rhythmic breathing and corneal reflex) and electroencephalography (EEG, brain function). The use of any of the 4 studied concentrations of the gas caused more nasal discomfort and vocalisations than the use of atmospheric air (P<0.001). EEG activity confirmed...

  2. Technical note: concentration and composition of airborne aerobic bacteria inside an enclosed rabbit shed

    Li, S.; Li, M.Y.; Mu, T.; Miao, Z.M.
    [EN] Numerous studies have been conducted to analyse bacterial aerosols in animal houses, which is beneficial for the control of animal diseases. However, little information on aerosols in enclosed rabbit sheds was available. An FA-1 sampler was employed to collect air samples in an enclosed rabbit house in the Qingdao region of China. Concentration, composition, and aerodynamics of bacterial aerosols inside the enclosed rabbit shed were systematically analysed. The concentration of airborne bacteria inside the rabbit shed was 2.11-6.36×104 colony forming unit/m3 (CFU/m3). Seventeen species of bacteria belonging to eight genera were identified. Among these, there were 11 species belonging...

  3. Study of failures in a rabbit line selected for growth rate

    Naturil Alfonso, Carmen; Lavara García, Raquel; Millán, P.; Rebollar, P.G.; Vicente Antón, José Salvador; Marco Jiménez, Francisco
    [EN] Selection for growth rate is negatively related with reproductive fitness. The aim of this work was to analyse the causes of fertility failure in rabbit does selected for growth rate and characterised for reproductive deficiencies (line R). In the experiment, 82 does were divided into 2 groups: naturally mated (NM) and artificially inseminated (AI), to relate luteinizing hormone (LH) concentration with ovulation induction and pregnancy rate by laparoscopic determination. Additionally, in 38 of these females ovulation rate and metabolites determination (leptin, NEFA, BOHB and glucose) were analysed and perirenal fat thickness measurement and live body weight (LBW) determined. The...

  4. Short communication: effect of saccharomyces cerevisiae supplementation on some biomarkers of oxidative stress in weaned rabbits during the hot-dry season

    Shehu, B.M.; Ayanwale, B.A.; Ayo, J.O.; Uchendu, C.
    [EN] A feeding trial was conducted to evaluate the effect of Saccharomyces cerevisiae (SC) supplementation on some biomarkers of oxidative stress in rabbits during the hot-dry season (temperaturehumidity index: 33.2±0.9oC). Sixty healthy weaned crossbred rabbits, aged between 5-6 wk with live weight of 612.7±60.8 g (mean±standard deviation) were used. The rabbits were divided into 5 treatment groups; SC0 receiving a control diet without supplementation of SC, and SC2, SC4, SC6 and SC8 receiving the control diet supplemented with SC at the rate of 2, 4, 6 and 8×109 colony forming units/kg, respectively. The activity of total superoxide dismutase and malonaldehyde in serum were not significantly affected,...

  5. Use of inter simple sequence repeats and protein markers in assessing genetic diversity and relationships among four rabbit genotypes

    El-Sabrout, K.; Aggag, S.A.
    [EN] The importance of DNA and protein applications as powerful tools in breeding programmes is revealed. The inter simple sequence repeats (ISSR) technique was used to characterise and determine phylogenetic relationships among 4 genotypes of rabbit, namely Alexandria (Alex), V line (V), New Zealand White (NZW) and California (Cal). Six out of 7 ISSR primers exhibited sufficient variability and were used to characterise the genetic diversity and relationships among studied genotypes. A total of 141 DNA  ands were detected. DNA fragments were generated with 87 (61.7%) being polymorphic, indicating considerable genetic variation among the examined genotypes. While protein electrophoresis provides a precise method for assaying variation in...

  6. Productive and reproductive performance of rabbits does as affected by bee pollen and/or propolis, inulin and/or mannan-oligosaccharides

    Attia, Y.A.; Bovera, F.; El-Tahawy, W.S.; El-Hanoun, A.M.; Al-Harthi, M.A.; Habiba, H.I.
    [EN] The aim of the paper was to compare the effect of prebiotics (inulin and/or mannan-oligosaccharides, MOS) and bee products (bee pollen and/or propolis) on productive and reproductive performance of rabbit does. Seventy nulliparous V-line female rabbits were distributed among 7 groups. The groups were fed the same diet and received no supplements (control group), natural molecules (bee pollen and/or propolis) at 200 mg/kg body weight (BW) or prebiotics (inulin and/or MOS) at 35 mg/kg BW. Productive, reproductive, biochemical and haematological traits were investigated. Bee pollen with propolis significantly increased body weight gain of does 1 wk after mating (3.53%), decreased feed intake (4.49%) and caused...

  7. Nutritive value of co-products derived from olivecake in rabbit feeding

    Blas, J.C. de; Rodriguez, C.A.; Bacha, F.; Fernandez, R.; Abad-Guamán, R.
    [EN] Olive cake is one of the main agro-industrial co-products in the Mediterranean area of Spain, with high availability almost all year round. In addition, most of the product is dehydrated, which increases its interest in monogastric species such as rabbits. Nineteen samples from various Spanish oil mills using different processing methods were analysed for their chemical composition and in vitro digestibility. The average composition was [in dry matter (DM) basis]: ash (9.64%), neutral detergent fibre (52.0%), acid detergent fibre (36.8%), acid detergent lignin (19.1%), crude protein (CP) (11.3%), insoluble neutral (8.0%) and acid detergent crude protein (5.15%), ether extract (10.9%) and gross energy (21.9 MJ/kg)....

  8. Genetic analysis of slaughter and carcass quality traits in crossbred rabbits coming from a diallel cross of four maternal lines

    Mínguez, C.; Sáchez, J.P.; Ragab, M.; El Nagar, Ayman Gamal Fawzy; Baselga Izquierdo, Manuel
    [EN] An experiment was carried out to estimate the genetic group effects and the crossbreeding genetic parameters of slaughter and carcass traits using data on the rabbits that were progeny of does coming from a full diallel cross between 4 maternal lines (A, V, H and LP) mated to bucks of the paternal line R. The rabbits of the 16 genetic groups, corresponding to the type of does of the diallel cross, were distributed in 4 Spanish farms and 1 genetic group (V line) was present in all farms in order to connect records among them and to be used as reference group. Crossbreeding parameters...

  9. Genetic analysis of growth traits in the progeny of rabbit does from a diallel cross

    Mínguez, C.; Sánchez, J.P.; Brun, J.M.; Ragab, M.; El Nagar, A.G.; Baselga, M.
    [EN] An experiment was carried out to estimate the genetic group effects and the crossbreeding genetic parameters of growth traits [body weight (BW), average daily gain (ADG), feed intake (FI) and feed conversion ratio (FCR)] in rabbits during fattening between 28 and 63 d. The rabbits were the progeny of does coming from a full diallel cross between 4 maternal lines (A, V, H and LP) mated to bucks of the paternal line R. On thousand fifty five  rabbits were controlled and the traits were recorded weekly, with the cage as the experimental unit for FI and FCR (283 cages)....

  10. Effect of feed restriction and different crude protein sources on the performance, health status and carcass traits of growing rabbits

    Uhlířová, L.; Volek, Z.; Marounek, M.; Tůmová, E.
    [EN] We evaluate the effect of the crude protein source (CP) in combination with 2 feeding strategies (AL: ad libitum or R: restricted) on the performance, health status and carcass traits of growing-fattening rabbits (between 33 and 75 d of age). Two experimental diets were formulated; the first containing soybean meal (SBM: 70 g/kg) as the main CP source and the second containing white lupin seeds (WLS: 105 g/kg) as the main CP source. A total of 160 weaned Hyplus rabbits (774±10 g live weight) were randomly allocated to the experimental groups, combination of feeding strategy and diet (AL SBM, R SBM, AL WLS and...

  11. Effect of divergent selection for uterine capacity on embryonic survival and development at 30 h post-mating in unilaterally ovariectomized rabbit females

    Peiró Barber, Rosa Mª; Gallego, M.; Blasco Mateu, Agustín; Santacreu Jerez, María Antonia
    [EN] Uterine capacity has been proposed as an indirect way to increase litter size. The aim of this work is to study the effect of a divergent selection for uterine capacity (UC) on reproductive traits at 30 h post mating in unilaterally ovariectomized (ULO) females. A total of 62 ULO females from the high line (selected to increase UC) and 39 ULO females from the low line (selected to decrease UC) were used. Ovulation rate was estimated as the number of corpora haemorrhagica and early embryonic survival was estimated as the ratio between number of embryos and ovulation rate. No differences in ovulation rate and...

  12. Determination of enzyme activity in rabbit seminal plasma and its relationship with quality semen parameters

    Viudes de Castro, M.P.; Casares-Crespo, L.; Monserrat-Martínez, A.; Vicente Antón, José Salvador
    [EN] The objective of this study was to determine rabbit seminal plasma enzyme activity. Furthermore, correlations between semen parameters and enzyme activity and male age were examined. The study was performed using 17 New Zealand White males from 5 to 9 mo old. Overall, 252 semen samples were collected from bucks from May to September. Semen characteristics were analysed and the seminal plasma was obtained by centrifugation. The activities of alanyl aminopeptidase (APN), aspartate transaminase (AST), alanine aminotransferase (ALT), γ-glutamyl transpeptidase (GGT), lactate dehydrogenase (LDH) and alkaline phosphatase (ALKP) in the seminal plasma fluid were measured. Significant differences between males were found in APN, GGT, LDH, ALKP...

  13. Abstracts of the 27th Hungarian conference on rabbit production

    [EN] About 100 participants took part in the 27th Hungarian Conference on Rabbit Production at Kaposvár, organised by the Kaposvár University, the Hungarian Branch of the WRSA and the Rabbit Production Board. This is the largest and most popular event for rabbit breeders in Hungary. Thirteen papers were presented by senior and young scientists. Topics of the papers covered almost all fields of rabbit research (production, housing and welfare, reproduction, genetics, nutrition). Full papers are available from the organiser ( on request.

  14. A Preliminary internet survey of pet rabbit owners’ characteristics

    Oxley, J.A.; Previti, A.; Alibrandi, A.; Briefer, E.F.; Passantino, A.
    [EN] This study aimed to conduct a preliminary survey to investigate basic ownership factors, frequency of microchipping and insurance and views of pet rabbit owners  n these areas and general rabbit management. More specifically, we aimed to investigate whether owners possess insurance, whether their rabbits are microchipped, and owners’ views on the recommendations relating to rabbits (e.g. recommended enclosure sizes) and the law. A questionnaire was designed and promulgated through social media sites and rabbit forums. A total of 1183 responses were received. Just over 29% of respondents sourced their rabbits through rescue centres. 73.9% (867/1174) of owners stated that they had no pet insurance for...

  15. Stimulate feed intake before weaning and control intake after weaning to optimise health and growth performance

    Read, Tehya; Combes, Sylvie; Gidenne, Thierry; Destombes, Nicolas; Grenet, Luc; Fortun-Lamothe, Laurence
    [EN] Post-weaning feed restriction is a common practice in rabbit farming to reduce mortality, but results in lower growth performance and slaughter weights. This study aimed to assess the influence of 2 diets both rich in fibre and low in starch, with high or low digestible energy (DE) and digestible protein (DP) contents for a constant DP/DE ratio offered from 18 to 70 d of age, on the growth performance and health parameters of rabbits. Eight hundred rabbit kits were divided in 2 experimental groups differing in the feed offered from 18 to 70 d: a high concentrate diet (HC group; 10.37 MJ DE/kg DM...

  16. Staphylococcus aureus nasal carriage could be a risk for development of clinical infections in rabbits

    Selva Martínez, Laura; Viana, David; Corpa Arenas, Juan Manuel
    [EN] Although nasal carriage has been described as a risk factor for Staphylococcus aureus infections in humans, there is a scarcity of studies about S. aureus nasal carriers in animals. In rabbits, S. aureus is one of the most important pathogens responsible for a number of different types of infections. This study was designed to determine the extent of staphylococcal nasal carriage and to establish whether a relationship exists between nasal carriage and development of lesions. One hundred and sixteen rabbits with and without chronic signs of staphylococcosis from 6 industrial rabbitries were monitored. Nasal swabs for microbiological assessments were obtained from all animals. Microbiological results...

  17. Preliminary study of the individual variability of the sexual receptivity of rabbit does

    Theau.Clément, M.; Tircazes, A.; Saleil, G.; Monniaux, D.; Bodín, L.; Brun, J.M.
    [EN] The aim of this preliminary experiment was to investigate the individual variability of the sexual receptivity of a rabbit doe in the presence of a buck (lordosis position, 0-1  variable). Twenty primiparous does maintained without reproduction were tested over 4 mo (3 tests per week at a 2- or 3-day interval) after their first kindling. Out of 48 tests, the receptivity rate was 52.5±50.0% on average and varied from 20.0 to 73.3% depending on the test day. The does were lactating at the beginning of the test period and a strong receptivity decrease was revealed at the peak of lactation. Receptivity did not vary...

  18. Genetic and non-genetic factors affecting rabbit doe sexual receptivity as estimated from one generation of divergent selection

    Theau.Clément, M.; Sécula, A.; Saleil, G.; Monniaux, D.; Brecchia, G.; Boiti, C.; Bodin, L.; Brun, J.M.
    [EN] Sexual receptivity of rabbit does at insemination greatly influences fertility and is generally induced by hormones or techniques known as “biostimulation”. Searching for more sustainable farming systems, an original alternative would be to utilise the genetic pathway to increase the does’receptivity. The purpose of the present study was to identify genetic and non-genetic factors that influence rabbit doe sexual receptivity, in the context of a divergent selection experiment over 1 generation. The experiment spanned 2 generations: the founder generation (G0) consisting of 140 rabbit does, and the G1 generation comprising 2 divergently selected lines (L and H lines) with 70 does each and 2 successive...

  19. Effects of rearing feeding programme on the young rabbit females’ behaviour and welfare indicators

    Martinez Paredes, Eugenio Melchor; Ródenas Martínez, Luis; Pascual Amorós, Juan José; Blas Ferrer, Enrique; Brecchia, G.; Boiti, C.; Cervera Fras, Mª Concepción
    [EN] Restriction of young rabbit females during rearing is a widespread management technique that could have negative consequences on their welfare and behaviour. In the present work, a total of 24 young rabbit females aged 9 wk were used to evaluate 3 rearing feeding programmes until first parturition: CAL, fed ad libitum with a control diet [C: 11.0 MJ digestible energy (DE) and 114 g digestible protein (DP) per kg dry matter (DM)]; CR, receiving the C diet restricted (140 g/d) from 12 wk of age; and F, fed ad libitum with a low energy/high fibre diet [F: 8.7 MJ DE and 88 g DP...

  20. Semen characteristics and sexual hormones of Hy-Plus rabbit bucks influenced by a dietary multi-enzymes additive

    Gado, H.; Mellado, M.; Salem, A.; Zaragoza, A.; Seleem, T.S.T.
    [EN] A total of 144 adult Hy-Plus rabbit bucks were randomly assigned into  four treatments of 36 replicates each, in a completely randomized design. Animals were fed ad libitum on basal diet supplemented with an enzyme complex (EZ) at 0 (EZ0), 1 (EZ1), 3 (EZ3) and 5 (EZ5) kg/ton of feed. Total sperm count was higher (P<0.05) in EZ5 than in EZ0. Sperm motility increased with increasing levels of the EZ additive being lowest for EZ0 and highest for EZ5 rabbits (P<0.05). Percentage of dead sperm was higher (P<0.05) in EZ0 than in EZ5 rabbits. Rabbit bucks received the highest levele...

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