World Rabbit Science - Vol. 16 (2)-2008

Tabla de contenidos

Influence of different eCG doses on sexual receptivity and productivity of rabbit does.
Influence of different eCG doses on the rabbit doe ovary response, fertilising aptitude and embryo development.
Influence of transport duration and season on sensory meat quality in rabbits.
Effect of cage density on growth and carcass performance of fattening rabbits under tropical heat stress conditions.
The effects of the complete replacement of barley and soybean meal with hard wheat by-products on diet digestibility, growth and slaughter traits of a local Algerian rabbit population.
Study on the factors affecting carcass traits of broiler rabbits in eastern Himalayan region of India.
Abstracts of the Giornate di Coniglicoltura ASIC 2007.
Abstracts of the 12e Journées de la Recherche Cunicole.

URI permanente para esta colecciónhttps://riunet.upv.es/handle/10251/8709

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Abstracts of the 12e Journées de la Recherche Cunicole
(World Rabbit Science. ICTA. UPV, 2008) World Rabbit Science
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Abstracts of the Giornate di Coniglicoltura ASIC 2007
(World Rabbit Science. ICTA. UPV, 2008) World Rabbit Science
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Study on the factors affecting carcass traits of broiler rabbits in Eastern Himalayan region of India
(World Rabbit Science. ICTA. UPV, 2010-08-02) Das, S.K.; Bardoloi, R.K.
[EN] Two hundred and ten adult rabbits of both sexes and belonging to four breeds: New Zealand White (NZW), Soviet Chinchilla (SC), Local (LC) and crossbred (CB) were used for this experiment. Rabbits were kept individually in cages under hutch housing conditions. Concentrate mash feed was fed at 100 g/head/d and green roughage ad libitum as per availability in different seasons. Rabbit slaughtering data were grouped in 4 categories: 3-5; 6-8; 9-11 and > above 11 m of age. All the data were classified by preslaughter weight, age at slaughter, breed and sex prior to statistical analysis. Slaughter weight, slaughter age, breed and sex had highly significant (P<0.01) effects on carcass weight of rabbits. The overall carcass weight was 854 g and SC was significantly (P<0.05) higher to NZW and CB. Also females' carcass weight was significantly higher than males (875 and 723 g, respectively). Dressed meat weight (including the edible organs) was significantly (P<0.01) affected by slaughter age, breed and sex. Dressing yield amounted on average 54.8% and sex, breed or slaughter age did not have a significant effect. Only preslaughter weight had a significant (P<0.05) effect on dressing %, with the highest value for the heaviest rabbits. Inedible offal weight amounted on average 679 g and all the 4 studied factors had a significant (P<0.01) effect on this part.
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The effects of the complete replacement of barley and soybean meal with hard wheat by-products on diet digestibility, growth and slaughter traits of a local Algerian rabbit population
(World Rabbit Science. ICTA. UPV, 2010-08-02) Lakabi-Ioualitene, D.; Lounaouci-Ouyed, G.; Berchiche, M.; Lebas, F.; Fortun-Lamothe, L.
[EN] Eighty one rabbits were used to study the utilisation of hard wheat by-products on the growth of rabbits from a local Algerian population. At weaning (28 d, 501±99 g), the animals were individually caged and received ad libitum one of the three experimental diets for 49 d. The control diet included 26% wheat bran (W26: control diet), alfalfa, bar- ley and soybean meal. The two other diets were formulated by substituting barley and soybean meal with hard wheat by-products, and contained 60% (W60) or 67% (W67) of these by-products (50 or 57% bran and 10% middling). On average, diets contained 11.8% crude fibre and crude protein decreased from 18.3 (W26) to 16.1% (W67). Growth traits and slaughter performances were recorded. Another group of thirty animals was used to determine dietary nutrient di- gestibility from 42 to 46 d of age. Dry matter digestibility and digestible energy content were lower in the W60 and W67 diets than in the control diet (W26) (71.3 and 71.5% vs. 74.9%, and 11.9 and 11.9 vs. 12.5 MJ/kg, respectively; P<0.01). In contrast, crude fibre digestibility was lower in W26 (21.9%) than in the other two diets (29.6 and 32.2% for W60 and W67, respectively; P<0.01). The growth rates were similar for all three groups (28.0, 27.1 and 26.0 g/d for W26, W60 and W67) as were the feed conversion ratios (3.14, 3.17 and 3.10, respectively). Dressing out percentage (66.4±2.0% on average for the cold carcass) was not affected by the amount of wheat by-products in the diet. The total mortality rate was high (23%), probably corresponding to the low crude fibre content of the three experimental diets, but was not connected to the amount of wheat by-products.
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Effect of cage density on growth and carcass performance of fattening rabbits under tropical heat stress conditions
(World Rabbit Science. ICTA. UPV, 2010-08-02) Villalobos, O.; Guillén, O.; García J., J.
[EN] Three hundred crossbred New Zealand, California, Butterfl y, Dutch, and Satin rabbits, weaned at 30 d and weighing 535±8 g (standard error) were assigned randomly to four treatments: 6, 12, 18 and 24 rabbits/m2 (3, 6, 9 and 12 rabbits/cage, respectively, each cage measuring 0.5 m2) resulting in 10 cages/treatment. During the experimental period (from weaning to 2.2 kg body weight) weekly individual live weight, cage feed intake, incidence of diarrhoea, ringworm, and injured rabbit data was recorded. The maximum temperature-humidity index ranged from 31 to 35, and so indicating severe heat stress. At the end of the experimental period 10, 20, 30 and 30 rabbits under densities of 6, 12, 18 and 24 rabbits/m2, respectively, were slaughtered and carcass performance recorded. Average daily gain and feed intake from weaning to the end of the experimental period decreased by 0.31±0.070 and 1.20±0.25 g, respectively, for each unit that the density increased at the beginning of the experiment (P=0.001). The length of the fattening period increased by 0.91±0.16 d (P=0.001) for each unit of increment of density. However, rabbit production (expressed in kg/m2) increased linearly and quadratically with density (P<0.008). Cage density did not affect feed effi ciency, which on average was 0.214 g/g (P=0.37). Animals housed at the highest density, compared to the average of those caged at lower densities, tended to show higher incidence of ringworm (68.9 vs 39.4%; P=0.075) and injury (16.8 vs 3.03%; P=0.12), and showed higher mortality (20.5 vs 9.63%; P=0.043). Density did not alter the dressing out percentage nor chilled carcass weight. The proportion of scapular fat (P=0.042) increased linearly with increasing levels of density, but perirrenal fat was unaffected (P=0.22). Increasing density reduced dorsal length linearly (P=0.001), and reduced drip loss percentage linearly and quadratically (P=0.097 and 0.018, respectively).Based on these results, under our heat stress conditions, avoiding densities higher than 18 rabbits/m2 or 34 kg/m2 at the end of fattening is recommended.
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Influence of transport duration and season on sensory meat quality in rabbits
(World Rabbit Science. ICTA. UPV, 2010-08-02) María, G. A.; Liste, G.; Campo, M.M.; Villarroel, M.; Sañudo, C.; Olleta, J.L.; Alierta, S.; Ministerio de Ciencia y Tecnología
Little is known about the effect that journey duration and position on the vehicle have on the sensory aspects of meat quality in rabbits. In this study, 156 rabbits were transported by road in a commercial truck for 1 h or 7 h in one of three replicates in summer or winter. After slaughter, slices from the left side of the longissimus dorsi muscle were vacuum-packaged and chilled at -18 ºC until the sensory analysis to assess odour, tenderness, juiciness, fibrousity, greasiness, and flavour intensity. Overall, the journey duration had a significant effect (P<0.05) on tenderness, fi brousity and overall liking of the meat, being better the results of the meat samples from the short transport treatment. Season had a significant effect (P<0.05) on the intensity of off-odours, being obtained the highest scores in summer transports. There was a significant interaction effect (P<0.05) of journey time and season on tenderness and meat odour. Therefore, meat from short journeys in summer was the most tender, and meat from long journeys in winter was the toughest. The position on the truck (in multi-layered cages) do not influence sensory meat quality. Therefore, rabbit sensory meat quality can be affected by transport time.
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Influence of different eCG doses on the rabbit doe ovary response, fertilizing aptitude and embryo development
(World Rabbit Science. ICTA. UPV, 2010-08-02) Ttheau-Clément, M.; Lebas, F.; Falières, J.
[EN] The aim of this experiment was to compare the ovary response, the fertilising aptitude and the embryo development of multiparous rabbit does having received during the whole career 0 (control: no injection, group 0), 8 or 25 IU of eCG (groups 8 and 25, respectively) 48 h before each 4 d post partum insemination. After the 11th series of insemination, two groups of 60 does were sacrifi ced 30 h or 14 d after insemination. The percentage of ovulating females does not vary according to the eCG treatment, but the ovulation rate (number of corpora lutea per ovulating does) and the fertilising rate (number of segmented ova/number of corpora lutea x100) increases with eCG dose [10.2, 11.1, 12.3 corpora lutea (P=0.011); 61.6 vs 97.5, 81.2% (P<0.001), for groups 0, 8 and 25 IU respectively]. In a same way, at 14 d of pregnancy, the embryo survival (1-(number of corpora lutea ¿ number of alive embryos/ number of corpora lutea)) increases with the injected amount of eCG (55.1 vs 69.9 and 83.1% for groups 0, 8 and 25, respectively, P=0.023). Moreover, eCG completely removes the fertilising failure independent of ovulation. Compared with the other does, lactating-non-receptive does have a lower fertilisation rate (70.0 vs 90.2%, P=0.008) and a weaker embryo survival (55.3 vs 83.5%, P<0.001). It is concluded that with intensive reproduction rhythm (4 d post partum insemination), an 8 IU of eCG injected 48 h before insemination is enough to enhance the ovulation rate, the embryo survival and the fertilisation rate of multiparous does.
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Influence of different eCG doses on sexual receptivity and productivity of rabbit does
(World Rabbit Science. ICTA. UPV, 2010-08-02) Theau-Clément, M.; Lebas, F.; Boiti, c.; G. Brecchia, G.; Mercier, P.
[EN] The aim of this study was to examine sexual receptivity and productivity of does injected 48 h before insemination with 8 or 25 IU of eCG (groups 8 and 25, respectively) in comparison with a control group (no injection, group 0). One hundred twenty four does were inseminated during 11 consecutive cycles (reproduction rythm: 35 d; inseminations: 4 d post partum and weaning: 28 d post partum). In comparison with the control group, eCG signifi cantly improves the receptivity of does (60.3 vs 80.5 and 79.8%; P<0.001), kindling rate (70.4 vs 80.9 and 79.4%; P=0.030) and the number of weaned rabbits/insemination (5.9 vs 7.1 and 7.1; P=0.008) for group 0, 8 and 25 respectively, during the whole experiment. eCG effi ciency is not obviously demonstrated for primiparous and non-lactating does. Authors conclude that only an 8 IU dose is able to improve 62% the productivity (measured as weaned rabbits per insemination) of multiparous and lactating does inseminated 4 d post partum.

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