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Descripción
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| Forty three cross-breed New Zealand, California, Butterfly, Dutch and Satin rabbit does were first mated with an average weight of 3.58±0.44 kg. Once confirmed pregnancy, rabbit does were randomly assigned to two treatments: in the treatment A the does were mated 14 d after parturition and litters were weaned at 35 d of age; in the treatment B the does were mated 21 d after parturition and litters were weaned at 42 d of age. A commercial pelleted diet was offered ad libitum. The following measurements were recorded for six months (the first three parities): eliminated does, doe weight at birth and at weaning, doe feed intake, number of mating per doe to get pregnant, number of kits and kit mortality, litter weight and litter feed intake, feed efficiency. Inside the farm the temperature humidity index during the sun light period ranged form 28 to 32, which can be considered as moderate/severe heat stress. In the rabbit does of treatment B the number of kits at weaning decreased by 36% (P=0.026) in comparison to does of treatment A and the parturition interval increased (+2.6 d with respect the expected interval). Feed efficiency tended to be lower by 25% (P=0.093) in the B group. No effect of treatments was detected on total eliminated does (7.55% on average), weight of rabbit does at birth (3.66 kg) and at weaning (3.79 kg), feed intake (72.0 g/kg BW0.75/d), fertility (91.7%) and the number of kits born alive (5.80). Parturition interval tended to increase between the third and the fourth parity (P=0.073). Kit mortality at birth was high (15.9%), and tended to be lower at the first parturition compared the following two ones (P=0.12). Kit mortality during lactation increased with parity number (P=0.029). Most of mortality of suckling rabbits (95%) occurred during the first 21 days of lactation. Accordingly, feed efficiency impaired with parity number (P=0.014). Parity number did not affect total eliminated does, weight of rabbit doe at birth or at weaning, feed intake, fertility and number of kits born alive. These results show that rabbit doe productivity impairs when lactation is extended and along successive reproductive cycles. | |
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Internacional
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Si |
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Nombre congreso
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9th World Rabbit Congress |
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Tipo de participación
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960 |
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Lugar del congreso
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Verona (Italia) |
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Revisores
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Si |
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ISBN o ISSN
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978-88-902814-6-4 |
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DOI
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Fecha inicio congreso
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10/06/2008 |
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Fecha fin congreso
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13/06/2008 |
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Desde la página
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1551 |
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Hasta la página
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1554 |
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Título de las actas
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Proceedings of the 9th World Rabbit Congress |