Results 251 to 260 of about 4,294,274 (294)
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Effects of selecting for litter size and body weight on the components of litter size in mice
Livestock Production Science, 1986Abstract Divergent selection for the total number of young born in the first three litters (TNY-3) and for 6-week body weight in mice resulted in different changes in the components of first litter size. Selection for large TNY-3 increased the number of ova shed while pre-natal losses were not modified.
Y. Bayon, L.F. Fuente, F. San Primitivo
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Environmental Research, 2009
The standardization of rodent litter sizes (or culling) in reproductive toxicity studies has become a common practice because it is believed that litter size affects pup postnatal growth and development. A claim has also been made that culling on postnatal day 4 or earlier reduces litter-size-induced variability in the pup growth thereby making ...
Francisco José Roma Paumgartten +1 more
exaly +3 more sources
The standardization of rodent litter sizes (or culling) in reproductive toxicity studies has become a common practice because it is believed that litter size affects pup postnatal growth and development. A claim has also been made that culling on postnatal day 4 or earlier reduces litter-size-induced variability in the pup growth thereby making ...
Francisco José Roma Paumgartten +1 more
exaly +3 more sources
Selection for Litter Size in Mice
Acta Agriculturae Scandinavica, 1977(1977). Selection for Litter Size in Mice. Acta Agriculturae Scandinavica: Vol. 27, No. 4, pp. 301-318.
Øystein Joakimsen, R. L. Baker
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Gestation Period and Litter Size in the Goat
British Veterinary Journal, 1978SUMMARY Data on gestation period, litter size, incidence of still-births and sex ratio obtained from the Institute’s mainly British Saanen goat herd between 1954 and 1976 are presented. The overall median gestation period in 374 cases was 150 days.
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1969
The breeding season at high latitudes is shorter than at low, so that the possible number of parturitions is reduced. In many field studies it has been noted that samples taken from higher latitudes inside a species range had larger litter sizes.
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The breeding season at high latitudes is shorter than at low, so that the possible number of parturitions is reduced. In many field studies it has been noted that samples taken from higher latitudes inside a species range had larger litter sizes.
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Weaning weight of pigs and litter sampling with reference to litter size
The Journal of Agricultural Science, 19371. Following an examination of weaning weight with respect to litter size, it is concluded that no general relation between the two exists. Although a significant regression of weight on litter size was found, it appears probable that in herds where the relation between fertility and milk yield is different, such a regression will not necessarily be ...
A. D. Buchanan Smith, H. P. Donald
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GENETIC AND IMMUNOLOGICAL ASPECTS OF LITTER SIZE IN THE MOUSE
International Journal of Immunogenetics, 1976SUMMARYThe effects of antigenic differences between mother and fetus on implantation number and on post‐implantation mortality were studied. No evidence was found to support the hypothesis that these two measurements were affected by such antigenic differences or by prior immunization of the mother to paternal antigens.
Hetherington, C M +2 more
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Evolution of Litter Size in Primates
The American Naturalist, 1979Despite strong selection for low reproductive turnover in primates in general, there is a considerable number of species in which multiple births regularly occur. Since multiple births are limited to the smallest species in both suborders, Strepsirhini and Haplorhini, it appears that restrictions of scaling set a threshold for maternal size below which
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Body size and litter size as predictors of pouch presence in marsupials
EvolutionAbstract The marsupial pouch is a key adaptation for offspring protection and development, yet its evolutionary drivers remain unclear. While body size matters, the role of litter size is less understood. Using phylogenetic comparative methods, we investigated the evolutionary relationship between pouch presence, body mass, and litter
Daniel M Casali +4 more
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The Effect of Sire on Litter Size in Mice
Journal of Heredity, 1968P, Schilling, W, North, R, Bogart
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