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Exploring the Sheep MAST4 Gene Variants and Their Associations with Litter Size. [PDF]

Animals (Basel)
Akhmet N, Zhu L, Song J, Akhatayeva Z, Zhang Q, Su P, Li R, Pan C, Lan X.   +8 more
europepmc   +1 more source

Association between polymorphisms in NOBOX and litter size traits in Xiangsu pigs. [PDF]

Front Vet Sci
Huang J, Ruan Y, Xiao M, Dai L, Jiang C, Li J, Xu J, Chen X, Xu H.   +8 more
europepmc   +1 more source

Inbreeding depression for litter size in two mice lines under divergent selection for environmental birth weight variability using genomic data. [PDF]

J Anim Sci
Ojeda-Marín C, Cervantes I, Formoso-Rafferty N, Gutiérrez JP, Rodríguez-Ramilo ST.   +4 more
europepmc   +1 more source

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Evolution of litter size

Population Ecology, 1981
SummaryTheories on the evolution of litter size among organisms were reexamined. The competition theories, including that based on the r−K‐selection hypothesis, could not explain well why low‐fecundity strategies have often evolved in stressful environments such as mountain streams, deep sea and the antarctic, where interspecies competition is ...
Yosiaki Itô, Yoh Iwasa
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Epistasis affecting litter size in mice

Journal of Evolutionary Biology, 2004
Abstract Litter size is an important reproductive trait as it makes a major contribution to fitness. Generally, traits closely related to fitness show low heritability perhaps because of the corrosive effects of directional natural selection on the additive genetic variance.
A C, Peripato, R A, De Brito, S R, Matioli, L S, Pletscher, T T, Vaughn, J M, Cheverud   +5 more
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THE INFLUENCE OF AGE ON LITTER-SIZE

Journal of Endocrinology, 1958
SUMMARY In three related strains of rats the numbers of fertile females have been found to fall with age and with the birth of successive litters. In thirty-five rats belonging to these three strains, each of which had a minimum of eight litters, the second litter was generally bigger than the first. From then on, however, litter-size gradually
D L, INGRAM, A M, MANDL, S, ZUCKERMAN
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Factors influencing litter size in pigs.

CABI Reviews, 2015
Abstract Improvement of litter size in pigs through selection was considered a difficult task in the past. Low heritability, negative correlation between direct additive genetic and maternal effect, limited size of the nucleus population, expression only in females, and relatively late age of measurements, were the main reasons for slow ...
Z. Luković, D. Škorput
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Optimal offspring sizes in small litters

Evolutionary Ecology, 1995
Numerous evolutionary models explore the trade-off between offspring size and offspring number. However, such models often fail when the number of offspring is small because optimal litter size (or litter size at optimal offspring size) may fall between the necessarily integer values for real litters.
Eric L. Charnov, Jerry F. Downhower, Luther P. Brown   +2 more
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Litter Size, Emotionality, and Avoidance Learning

Psychological Reports, 1963
In a recent experiment concerned with the interaction of genetic and ontogenetic determinants of adult behavior (Levine & Broadhurst, in press), rats from the Maudsley Reactive and Nonreactive strains which have been selected for emotional defecation, were subjected to controlled infantile stimulation (Levine, 1960) and compared with 40 nontreated ...
P. L. Broadhurst, Seymour Levine
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