Mortality in Young Rabbits : A Review

Rashwan, A. A.; Marai, Ibrahim

doi:10.4995/wrs.2000.427

Cited by 29 publications

(17 citation statements)

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“…Rabbit meat is principally produced following a 3-way crossbreeding scheme, using crossbred females which are mated to sires from a paternal line selected for growth traits (Rochambeau, 1988;Baselga, 2004). These females are expected to show better reproductive performance than the average of the does of the parental lines due to the advantage of heterosis and complementarity in reproductive traits (Khalil et al, 1995;Orengo et al, 2003;Ragab, 2012).…”

Section: Introductionmentioning

confidence: 99%

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

Mínguez

Sánchez²,

Brun

et al. 2015

World Rabbit Sci.

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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). The 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 were estimated according to the Dickerson model. Regarding dam effects between pure lines for BW at weaning, A line was the heaviest and showed significant differences with LP and V lines (61 and 30 g, respectively). Upon completion of the fattening period, the differences in favour of A line for BW at weaning were compensated. Throughout the fattening period, no significant differences were observed between the lines as dam lines. At the end of the fattening period, no significant differences were observed between the crossbred groups. Regarding the reciprocal effects, the most relevant results were the significances for FCR in favour of H as sire line. For all traits, the confidence intervals at 95% of all contrast and effects were large. The estimates of maternal heterosis were, in general, negative, which could be a consequence of the positive heterosis for litter size. The AH cross showed significant maternal heterosis for BW at 43 d (-53 g), ADG between 28 and 42 d (-3.5 g/d), FI between 28 and 63 d (-7 g/d) and FCR between 42 and 63 d (-0.15). The combination of direct and maternal effects of the V line was the worst for all growth traits, showing significant differences with the LP line for most of them, for instance 0.13 worse FCR between 28 and 63 d. Grand-maternal effects were less important than direct-maternal.

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Section: Introductionmentioning

confidence: 99%

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

Mínguez

Sánchez²,

Brun

et al. 2015

World Rabbit Sci.

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“…In addition, the death of kits in the preweaning period is also related to the season, parity order of the female and its physiological status. In this regard, a higher percentage of dead kits was found in winter than in spring (El-Ashram et al, 2020), in multiparous rather than nulliparous females (Rashwan and Marai, 2000) and in lactating rather than non-lactating females (Rebollar et al, 2009).…”

Section: Introductionmentioning

confidence: 84%

“…Moreover, kit stress related to the occurrence of cannibalism in its litter can cause anorexia, and consequently reduces the probability of survival (Vicente et al, 1995). It should be noted that this phenomenon is responsible for 0.5 to 26% of preweaning mortality in rabbit (Leone-Singer and Hoop, 2003;El-Ashram et al, 2020) and is due to insufficient drinking water around parturition time (Bergaoui, 1992;Rashwan and Marai, 2000).…”

Section: Cannibalism Effectmentioning

confidence: 99%

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Prenatal factors affecting the probability of survival between birth and weaning in rabbits

et al. 2023

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The aim of this study was to analyse the relationships between kit birth weight and litter size with kit survival from birth to weaning, and to estimate the effects of place of birth, nest quality, cannibalism, lactation, parity order, season and sex. A total of 1696 kits from 82 females of the ITLEV2006 synthetic line were used in this study. A logistic regression was performed. Kit birth weight was directly related to the probability of the kit’s survival from birth to weaning, and increasing birth weight by one gram increased the likelihood of kit survival by 8% to 10% (P<0.001). In line with the decrease in birth weight of kits as the number of kits at birth increases, litter size showed a negative relationship to the probability of survival from birth to weaning, and increasing the litter by one kit at birth decreased the probability of survival of the kits by 5% to 9% (P<0.05). Regarding effects, cannibalism events in the litter decreased the probability of survival of the kits in the first week of life (P<0.01). Being born in the cage decreased the probability of survival of the kits from birth to weaning, and kits born outside the nest had a lower chance of survival than those born inside the nest (P<0.01). The order of parturition had a positive effect on probability of survival of the kits from 5 days of age to weaning (P<0.05). Female kits had a lower chance of survival than male kits, but only until 5 days of age (P<0.01). The lactation status displayed a negative effect on the probability of survival of the kits in the first week of life, and kits gestated in lactating females had a lower chance of survival than those gestated in non-lactating females (P<0.05). In conclusion, the probability of kit survival in the first days after parturition was affected mainly by its weight at birth, litter size, cannibalism events, place of birth of kit, parity order, sex and lactation status, while the probability of kit survival at weaning was directly related to its weight at birth, litter size, place of birth of kit and parity order.

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“…Consequently, feed conversion ratio was also better in DC and DD animals compared to CC ones (P<0.001). Moreover, supplementation with Digestarom ® during AW did not show mortality from 5 to 8 wk of age, which is a good outcome in the most critical phase of growing rabbits (Rashwan and Marai, 2000). No interaction between before and after weaning supplementation was observed for growth traits.…”

Section: Gastrointestinal Ph and Caecal Microbial Count Of 5 And 8 Wkmentioning

confidence: 91%

Dietary supplementation of Digestarom® herbal formulation: effect on apparent digestibility, faecal and caecal microbial counts and live performance of growing rabbits

et al. 2016

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Abstract:The experiment aimed to study the effect of Digestarom ® dietary inclusion (herbal formulation containing a mixture of essential oils, herbs, spices and extracts) on apparent digestibility and digestive ecosystem of growing rabbits, as well as the effects of its supplementation before and after weaning on growth performance. At kindling, rabbit does and litters were divided into 2 dietary groups (51 does/group) and fed either a control diet (C) or a diet supplemented with 300 mg Digestarom ® /kg diet (D) until weaning, which occurred at 35 d (before weaning supplementation). Each group was further divided into 3 dietary groups: CC received the control diet and DD received the D diet from 5 to 12 wk of age, and DC were fed with D (from 5 to 8 wk of age) and C diets (from 8 to 12 wk of age) (after weaning supplementation; 54 kits/ group). An in vivo digestibility trial and a faecal microbial count were carried out on growing rabbits that received only the C or D diets during the trial. The C group showed higher DM intake than D group (215 vs. 196 g/d; P<0.05). The faecal digestibility of ether extract (75.9 vs. 59.8%; P<0.001), cellulose (25.9 vs. 20.6%; P<0.05) and gross energy (51.8 vs. 49.1%; P<0.05) was higher for C than for D group, whereas that of starch (98.9 vs. 98.8%; P<0.001) and the digestible protein to digestible energy ratio (13.9 vs. 13.2 g digestible protein/MJ digestible energy; P<0.01) was the highest for rabbits fed D diet. Stomach and caecal pH, caecal and faecal microbial counts were independent of the dietary treatment. The only exception was the stomach pH in 8 wk-old rabbits, which had the lowest value in C rabbits (P<0.05). The D supplementation before weaning improved feed conversion ratio throughout the growing phase (4.3 vs. 4.4 for D and C, respectively; P<0.05), whereas significant differences in daily weight gain, feed conversion ratio and mortality were observed only in the first period after weaning. Based on the results obtained, dietary supplementation with Digestarom ® does not seem to confirm the positive results previously reported for growing rabbits.

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Mortality in Young Rabbits : A Review

Cited by 29 publications

References 0 publications

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

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

Prenatal factors affecting the probability of survival between birth and weaning in rabbits

Dietary supplementation of Digestarom® herbal formulation: effect on apparent digestibility, faecal and caecal microbial counts and live performance of growing rabbits

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