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Atti delle Giornate di Coniglicoltura AsIC 2011 – 8-9 aprile 2011 – Forlì – Italia 80% of their adult weight. The does condition is the most critical after the first kindling therefore in the present study the authors examined the effect of the length of the period between the first kindling and the next insemination (day 11, 18 and 25) on the does’ production. 70 mATERIALS ANd mEThOdS The experiment was conducted at the rabbit farm of the Labnyúl Ltd using 311 Pannon White rabbit does. The does were housed in cages having a basic area of 90x40 cm. The temperature ranged between 15 and 28°C depending on the season. The does were mated first at age of 16.5 weeks. Generally 10 hour lighting period was applied which was increased to 16 hours 8 days prior to insemination with the aim of biostimulation. at the time of kindling the does were intramuscular injected 0.2 ml receptal (Gnrh analogue). The rabbit does were randomly sorted into three groups and were inseminated 11, 18 or 21 days following their first kindling (ai-11, n=101; ai-18, n=109; ai-25, n=101). afterwards all does were inseminated at day 11 after kindling. The size of the litters was equalized: the maximum number of kits per litter was 10. Productive traits were evaluated by means of multifactor anoVa, kindling rate and suckling mortality was analyzed by chi-square test. The period until re-insemination was considered as fixed effect while the parity was treated as a random factor. in the evaluation the first kindlings were not considered because they were independent of the time of re-insemination. statistical analyses were conducted using sPss 10.0 software package. RESULTS ANd cONcLUSIONS results are summarized in Table 1. The average kindling rate between the 2 nd and the 7 th parturitions of the ai-11, ai-18 and ai-25 groups were 68.0, 74.1 and 76.3%, respectively. The results justify both the short and long term favourable effects of the longer period applied after the first parturition on the kindling rate. The body weight of the ai-25 does were slightly higher than that of the other groups but the differences were not significant. no differences were found for litter size among the groups. suckling mortality showed significant differences at the 2 nd and 5 th kindlings but pooling the results for all kindlings the differences among the groups were small. no significant differences were found for individual and litter weight at day 21. other authors (Xiccato et al., 2005; Castellini et al., 2006; Feugier and Fortun-Lamothe, 2006; szendró´ et al., 2008) conducted several experiments where the insemination at day 11 was compared to a more extensive reproduction rhythm. in these experiments the period between kindling and reinsemination was different throughout the whole productive period contrary to the present study where the difference was confined to the first kindling. in these abovementioned experiments the authors observed that in the extensive groups the body weight of the does increased, the condition and kindling rate improved but the litter
Lavori scientifici - sessione Riproduzione e Genetica size generally did not alter. Contrary to these favourable results the annual production decreased. in our study the longer period was only applied after the first kindling that could be compensated by the does during the latter production phase. The observed small differences among the groups can be summed into the total production per 100 inseminations. using this parameter the superiority of the ai-25 group over the ai-11 group was obvious. The observed substantial differences between these groups were 14.4, 12.8, 14.1 and 8.1% for total number of born kits, number of kits born alive, number of kits alive at day 21 and litter weight at day 21 (P
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FONDAZIONE INIZIATIVE ZOOPROFILATTI
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FONDAZIONE INIZIATIVE ZOOPROFILATTI
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Sponsors
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GIORNATE DI CONIGLICOLTURA ASIC 201
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RELAzIONI SU INVITO Feed restrictio
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ImpAcT OF A pOST-wEANINg FEEd RESTR
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