Abstract In rabbits’ reproductive performance, litter size, birth weight, growth, and mortality rate are among the most important indicators to define the productive potential and they are associated with parity order. Birth weight and little size are valuable parameters as related to mortality and weaning weight. Thus, it is important to study individual newborn and intra-litter homogeneity parameters. This trial aimed to consider the litter homogeneity weight at birth, both within each litter and in the whole population, in order to suggest new proper within-litter homogenisation parameters. In this study, the 1st and 6th parity order had, respectively, the lowest and highest values in litter size (8.96 vs 12.39, n), born-alive (8.36 vs 12.22, n), litter weight (456.4 g vs 719.8, g), born-alive weight, and quartiles’ homogeneity. These parameters decreased in greater parity orders. No significant effects on still-born numbers and mortality rates were evidenced. All these litter homogeneity evaluation parameters appeared interesting in describing differences between parity orders. The results confirmed that does parity order influences litter size and born-alive weight, but also the intra- and inter-litter homogenisation. Litter homogenisation is crucial to ensure a proportionate share of milk, more equal growth, and better productive performances. Based on these results, we suggest for the commercial genetic centres to equalise the litters according to the birth weight, by dividing the population into quartiles and rearing kits with light birth weight in smaller litters and those with heavier birth weight in larger litters. HIGHLIGHTS Does parity order influences litter size and born-alive weight Kit’s quartiles distribution is a useful tool for equalisation practice

中文翻译：

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奇偶校验顺序对垫料均匀性参数的影响

摘要 在兔子的繁殖性能中，窝产仔数、出生体重、生长和死亡率是定义生产潜力的最重要指标，它们与胎次顺序相关。出生体重和小体型是与死亡率和断奶体重相关的有价值的参数。因此，研究个体新生儿和窝内同质性参数非常重要。该试验旨在考虑出生时每窝和整个种群的窝均质重量，以提出新的合适的窝内均质参数。在这项研究中，第 1 和第 6 胎次分别具有最低和最高的窝产仔数（8.96 对 12.39，n）、出生活（8.36 对 12.22，n）、窝重（456.4 克对 719.8，g )、出生体重和四分位数的同质性。这些参数以更大的奇偶顺序降低。没有证据表明对死产人数和死亡率有显着影响。所有这些垫料均匀性评估参数在描述奇偶顺序之间的差异时似乎很有趣。结果证实，胎次顺序是否会影响窝产仔数和出生体重，但也会影响窝内和窝间的同质化。垫料均质化对于确保牛奶的比例份额、更平等的生长和更好的生产性能至关重要。基于这些结果，我们建议商业遗传中心根据出生体重均衡产仔数，将种群分为四分位数，小窝出生体重轻，大窝出生体重重。