影响兔产仔数成分的环境和遗传因素

IF 0.8 4区 农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE
R. Belabbas, I. Ilès, M. Argente, Rym Ezzeoug, Hacina Ainbaziz, M. García
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引用次数: 1

摘要

在家兔中,排卵率与产前存活率一起是窝产仔数的主要限制因素之一。这两种成分都受到与女性及其环境有关的几个因素的影响。因此,了解这些成分及其变异因素是设计饮食、优化繁殖性能和遗传选择的关键。本文综述了凋落物数的主要组成部分及其变化的环境因子。对遗传因素和窝产仔数组成遗传选择程序的主要结果进行了综述。在这方面,饮食限制和减少日照时间对排卵率有负面影响,而女性的身体状况、胎次顺序和年龄对排卵率有积极影响。然而,据报道,随着排卵率的增加,卵母细胞质量的恶化加剧,导致胚胎和胎儿存活率下降。饮食限制和热应激对胚胎和胎儿存活也有负面影响,增加妊娠期失败,而良好的血管化和子宫角足够的可用空间是胚胎和胎儿存活的关键。由于遗传力较高,排卵率可作为提高产仔数的间接选择标准。然而,这种选择是相关的,但它没有改变产仔数,因为产前死亡率增加。子宫容量直接关系到产前生存,虽然它的选择也未能成功地增加产仔数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Environmental and genetic factors affecting litter size components in rabbits
In rabbits, ovulation rate is, together with prenatal survival, one of the main limiting factors for litter size. Both components are affected by several factors related to females and their environment. Thus, understanding these components and their factors of variation is key in designing diets, optimisation of reproductive performance and genetic selection. In this review, authors summarise the main components of litter size and their environmental factors of variation. Genetic factors and the main results of genetic selection programmes on components of litter size are also summarised. In this regard, a negative effect of dietary restriction and reduced day light hours is found, as well as a positive effect of body condition, parity order and age of female on ovulation rate. However, an increase in deterioration of oocyte quality has been reported as ovulation rate increases, leading to decreased embryonic and foetal survival. Dietary restriction and heat stress also have a negative effect on embryonic and foetal survival, increasing the failures during gestation while good vascularisation and enough available space in uterine horn are keys to embryonic and foetal survival. Ovulation rate was proposed as indirect selection criterion to improve litter size due to higher heritability. However, this selection was relevant, but it did not modify litter size because of an increase in prenatal mortality. Uterine capacity has been directly related to prenatal survival, although its selection has also been unsuccessful in increasing litter size.
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来源期刊
World Rabbit Science
World Rabbit Science 农林科学-奶制品与动物科学
CiteScore
1.70
自引率
25.00%
发文量
22
审稿时长
>36 weeks
期刊介绍: World Rabbit Science is the official journal of the World Rabbit Science Association (WRSA). One of the main objectives of the WRSA is to encourage communication and collaboration among individuals and organisations associated with rabbit production and rabbit science in general. Subject areas include breeding, genetics, production, management, environment, health, nutrition, physiology, reproduction, behaviour, welfare, immunology, molecular biology, metabolism, processing and products. World Rabbit Science is the only international peer-reviewed journal included in the ISI Thomson list dedicated to publish original research in the field of rabbit science. Papers or reviews of the literature submitted to World Rabbit Science must not have been published previously in an international refereed scientific journal. Previous presentations at a scientific meeting, field day reports or similar documents can be published in World Rabbit Science, but they will be also subjected to the peer-review process. World Rabbit Science will publish papers of international relevance including original research articles, descriptions of novel techniques, contemporaryreviews and meta-analyses. Short communications will only accepted in special cases where, in the Editor''s judgement, the contents are exceptionally exciting, novel or timely. Proceedings of rabbit scientific meetings and conference reports will be considered for special issues. World Rabbit Science is published in English four times a year in a single volume. Authors may publish in World Rabbit Science regardless of the membership in the World Rabbit Science Association, even if joining the WRSA is encouraged. Views expressed in papers published in World Rabbit Science represent the opinion of the author(s) and do not necessarily reflect the official policy of the WRSA or the Editor-in-Chief.
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