Analysis of reproductive performances during the formation of a synthetic rabbit strain

Brun, Jean- Michel J.- . M.; Baselga, M.

doi:10.4995/wrs.2005.514

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…Over the years, the number of live born and weaned kits was improved (from 6.63±2.78 to 8.10±2.72 and from 5.41±2.45 to 7.19±1.92, respectively; P≤0.001), with a good effect also on mortality rate before weaning in contrast with expectation (Rashwan and Marai, 2000), and consequently also the litter weight (from 50417±2118 to 7287±1876 g; P<0.001) and the average individual weight at weaning (from 975±208 to 1025±136 g; P<0.001), even if the average daily gain in the first month seems be negatively affected by litter size at birth (Poigner et al, 2000). The results can be compared to those reported by Brun and Baselga (2005) for a synthetic rabbit strain.…”

Section: Resultsmentioning

confidence: 71%

Technical Note: Year, season, and parity effect on weaning performance of the Carmagnola Grey Rabbit breed

et al. 2012

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AbstrAct:To evaluate the main environmental factors in the productivity of Carmagnola Grey rabbits -an endangered breed indigenous to northern Italy-data collected from a total of 1486 litters over 8 yr were analysed. Production data on the pure closed nucleus herd of the University of Turin were used. Effects of parity, season and age of weaning on the number of rabbits born alive and weaned, litter weight and individual average weight at weaning were studied. The following average performance rates over the 8 yr period were determined: 8.1 live born and 7.2 weaned kits per litter and a litter weight at weaning (on average of 35 d) of 7287 g or 1024 g individual weaning weight. Year and season both had a significant effect (P<0.001) on all the traits studied as well as weaning age (P<0.001). To summarise, all productive traits showed an improvement in the last two-three years of the trial, in does after the first delivery, and at the higher kid weaning age (6 week), while shown a decreasing in summer. The performances of the Carmagnola Grey rabbit are encouraging, even if not comparable to hybrid strains.

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Section: Resultsmentioning

confidence: 71%

Technical Note: Year, season, and parity effect on weaning performance of the Carmagnola Grey Rabbit breed

et al. 2012

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“…It seems that a compensatory growth has taken place after weaning; this process has previously been shown in rabbits by Testik et al (1999) and Belhadi (2004). This compensatory growth is expected because maternal effects lose importance after weaning (Mínguez, 2011) and ADG is relatively free of maternal effects (Estany et al 1989;Camacho and Baselga, 1991;Cifre et al 1999;Su et al 1999). It must also be noted that the pattern of the contrast for ADG 42-63 was opposite to that for ADG [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] , all the estimates for the last one being positive, but only significant for the contrast AL-VV.…”

Section: Differences Between Genetic Groupsmentioning

confidence: 83%

“…One result which clearly draws attention is that the signs of the majority of the estimates for BW, ADG and FI are negative. This could be a partial consequence of the positive heterosis showed by the crossbred does regarding litter size (Brun and Saleil, 1994;Khalil and Afifi, 2000;Baselga, et al 2003;Brun and Baselga, 2005;Youssef et al, 2008;Ragab, 2012). The higher litter sizes of the crossbred does compared to purebreds would penalise body weight, weight gain and feed intake of their progeny (Rouvier et al, 1973;Johnson et al, 1988;Lukefahr et al, 1990;Ferguson et al, 1997).…”

Section: Maternal Heterosismentioning

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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“…A result which clearly draws attention is that the sign of the majority of the estimates for slaughter and carcass traits were negative. Many results of positive heterosis, regarding litter size, have been reported (Brun and Saleil, 1994;Khalil and Afifi, 2000;Baselga, et al 2003;Brun and Baselga, 2005;Youssef et al, 2008;Ragab, 2012). This results in higher litter sizes of the crossbred does compared to purebreds, which would penalise body weights Johnson et al, 1988;Lukefahr et al, 1990;Ferguson et al, 1997).…”

Section: Maternal Heterosismentioning

confidence: 94%

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

Mínguez

Sáchez²,

Ragab

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 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 were estimated according to Dickerson's model. 1896 rabbits were measured for slaughter traits and 950 for carcass traits. The A and LP lines had the lowest values for dressing percentage (-1.71 and -1.98 compared with H line and -1.49 and -1.75 with the V line, respectively). The A line was the heaviest for commercial carcass weight. No relevant differences were observed between the crossbred groups for all traits. Regarding the reciprocal effects, there were significant differences in favour of A line as sire line in the crossbred AV. Regarding the combination of direct and maternal effects, the A line showed significantly higher values for cold carcass weight (133 g., 71 g. and 142 g. compared to the H, LP and V lines). For the same parameter the H line showed significantly higher averages on dressing percentages than A and LP lines, 1.44 and 2.13%, respectively. Line A also showed, in general, better direct-maternal effects than the V line. Grand-maternal effects were less important than direct-maternal ones. The estimates of maternal heterosis were, in general, negative, which could be a consequence of the positive heterosis for litter size. However, despite this relationship between growth and litter traits, it has not been common to find negative maternal heterosis in growth traits. A diminution of dressing percentage was detected in some crossbreds (AL and LV) and care must be taken if these types are used.

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Analysis of reproductive performances during the formation of a synthetic rabbit strain

Cited by 8 publications

References 12 publications

Technical Note: Year, season, and parity effect on weaning performance of the Carmagnola Grey Rabbit breed

Technical Note: Year, season, and parity effect on weaning performance of the Carmagnola Grey Rabbit breed

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

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

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