This work studied whether the expected better subsequent reproduction for permanent controlled nursing versus free nursingcould be further improved by a caloric biostimulation with temporary fasting and re-feeding of does before artificial insemination(AI) and how it influences the development of current litters. A total of 240 females were randomly assigned at first day oflactation to one of three groups each with 80 does in a balanced manner according to the number of kits, litter weight, newborn kitweight after adjusting to 8 rabbits per litter, doe body weight and parity. Rabbits in the control group (C) were fed ad libitum andnursed freely up to weaning at 35 days of age. In the group of local farm practice (F) females also received a diet ad libitum butcontrolled nursing was used. That meant once a day nursing for the first 14 days of lactation (8 am to 9 am) with using a metalsheetfor doe–litter separation and free nursing afterwards. In the biostimulated group (B) does were subjected to a 24-h fastingbetween days 8 and 9 (i.e. only drinking was possible between 10 am Monday and 10 am Tuesday) with a 48–50 h ad libitum refeedingbefore AI (at 11 days, between 10 am and 12 am Thursday) and similar controlled nursing regime to F group. Thisbiostimulation reduced the ratio of does having turgid vulva by 16.9% (46.7 vs. 63.6 and 48.1% for the B, F and C groups,respectively; Pb0.05) and the kindling rate by 6.8% (78.7 vs. 85.5 and 71.1%; Pb0.05) when compared with merely controllednursing (F). However, biostimulation tended (P=0.152) to increase the total-born by one kit per litter (11.2 vs. 10.2 and 10.3).Individual kit weights and litter weights at weaning were reduced in response to controlled nursing (944, 966 vs. 1033 g; P=0.001and 7179, 7451 vs. 7900 g; P=0.001). Biostimulation led to 17% lower total weight of 70-day-old rabbits per doe (14.54 vs.17.53, 17.51 kg; P=0.009) compared to F and C groups due to poorer 35–70 day growth (36.1 vs. 40.5, 40.8 g/day; P=0.001)and higher mortality than for C group (12.3 vs. 7.9%; Pb0.01). In conclusion, this biostimulation worsened the subsequentreproductive performance of does and the development of current litter. Further research is required about the presumableinteraction between the nursing system and feeding strategy of does.
|Numero di pagine||9|
|Stato di pubblicazione||Published - 2008|
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