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Maternal and neo‐natal weight in the grasscutter Thyronomys swinderianus (Temminck) in Ghana *
Author(s) -
ASIBEY EMMANUEL O. A.
Publication year - 1981
Publication title -
african journal of ecology
Language(s) - French
Resource type - Journals
SCImago Journal Rank - 0.499
H-Index - 54
eISSN - 1365-2028
pISSN - 0141-6707
DOI - 10.1111/j.1365-2028.1981.tb01072.x
Subject(s) - litter , zoology , biology , captivity , negative correlation , positive correlation , body weight , endocrinology , medicine , ecology
Summary Neonatal weight and maternal weight at parturition in forty‐six captive grasscutters and weights of embryos in sixty‐six full‐term pregnancies and their maternal weights were analysed. The captive sample with a regular food supply showed no apparent correlation between litter weight as a percentage of maternal weight and neonatal weight, nor between litter size and mean litter weight. These variables were, however, negatively correlated ( P< 0. 1) in samples of wild animals. Both samples showed a strong positive correlation between maternal weight and litter size, litter size and litter weight, and litter weight as a percentage of maternal weight and litter size. But whereas maternal weight was significantly positively correlated with litter weight in captivity (P<0.01) there was no apparent correlation in the wild. There was a strong negative, significant correlation in the wild. There was a strong negative, significant correlation between maternal weight and mean litter weight in the wild but in captivity, the strong correlation was positively significant. There is great variation in the weights of young and embryos both in litter mates and from litter to litter. Embryos implanted at the cervical end of the uterine horn tended to be heavier than those implanted at the ovarian end. RÉSUMEÉ On a analysé les poids des nouveau‐nés et de la mére lors de la parturition chez quar‐ante‐six aulacodes captifs et les poids des embryons à terme et de leur mère dans soixante‐six cas de gestation. Chez l'échantillon captif nourri régulièrement, on ne constate pas de corrélation apparente entre le poids de la portée exprimé en pourcentage du poids maternel et néonatal, ni entre la taille et le poids moyen de la portée. Ces variables cependant presente une corrélation négative (P<0.1) parmi les échantillons d'animaux sauvages. Les deux échantillons présentent une bonne corrélation positive entre le poids de la mére et la taille de la portée, la taille et le poids de la portie, le poids de la portée exprimé en pourcentage du poids maternel et la taille de la portée. Mais lè où le poids maternel présente une corréation positive significative avec le poids de la portée en captivité (P<0.01), it n'y a aucune corrélation apparente sur le terraine. It y a une nette corrélation significativement négative entre le poids maternel et le poids moyen de la portet sur le terrain, mais en captivité cette nette corrélation est significativement positive.

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