Adaptive capacity of female rabbits submitted to a change in breeding practices

Clément, Michèle Theau; Galliot, Pascal; Souchet, Christophe; Bignon, Laure; Fortun-Lamothe, Laurence

doi:10.4995/wrs.2016.5155

Cited by 1 publication

(2 citation statements)

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“…The KR (on average 70.1 %) was consequently 2.1 % lower. In the given analysis, the KR was also lower than that reported by Castellini et al (2010), Manal (2010), Gerencsér et al (2011), Coutelet (2015, and Theau-Clément et al (2016). Furthermore, the LS was relatively low compared with results from the literature concerning the breeding goals of modern hybrid rabbit strains (Coutelet, 2015;Maertens and Buys, 2015;Maertens and De Bie, 2017).…”

Section: Discussioncontrasting

confidence: 52%

“…Schüddemage (1999), Carluccio et al (2004) and Coutelet (2015) found respective pregnancy rates between 64 % and more than 80 % and an average LS of between 8.1 and 10.7 total kits born in different breeds. In practice, the KR is lower than the conception rate and varies widely between 29 % and 90 % (Dimitrova et al, 2009;Castellini et al, 2010;Manal, 2010;Gerencsér et al, 2011;Coutelet, 2015;Theau-Clément et al, 2016). It has been previously shown that housing and feeding are factors which influence reproductive performance.…”

Section: Introductionmentioning

confidence: 99%

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A new parameter describing fertility in rabbits at the farm level: the kit index

Hoy¹

2018

Arch. Anim. Breed.

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The kit index (KI) combines the kindling rate (KR) and the average litter size (LS) per group of does, per breeding round, per year, or per farm and represents the number of total or live-born kits per 100 inseminated does. The KR is the percentage of kindlings per number of inseminated does. Mathematically, the KI is the product of the KR multiplied by the average LS. The KI was calculated on the basis of 12 730 inseminated does and 89 864 live-born kits from one rabbit farm during a 25-month period from 2015 to 2017. The average KR was 70.1 ± 9.1 % with a minimum (per breeding round) of 35.4 % and a maximum of 90.8 %. The average LS of total kits born was 9.16 ± 0.91, whilst the average litter size of live-born kits was 8.87 ± 0.90. The KI of total kits born was calculated to be 649± 121 kits per 100 inseminated does (min of 332, max of 971), while the KI of live-born kits ranged between 326 and 944 kits per 100 inseminated does (mean of 626 ± 122). The KI is a normally distributed parameter with respect to both the total kits born and the live-born kits per 100 inseminated does. All three parameters (KR, LS, and KI) were characterized by large variations from week to week with a tendency toward a reduction in the summer months. No difference was found between the two housing units, but large differences were found between the two genetic strains used on the given farm. Therefore, it can be concluded that the KI is able to characterize the complex fertility situation on the given rabbit farm. The KI can be used to demonstrate and to solve problems regarding artificial insemination, in addition to general issues with insemination management.

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