Activity of breeding Peromyscus leucopus

1980 ◽  
Vol 58 (3) ◽  
pp. 313-316 ◽  
Author(s):  
Richard M. Harland ◽  
John S. Millar
Keyword(s):  
Litter Size ◽  
Peromyscus Leucopus ◽  
Meteorological Conditions ◽  
Lactating Females ◽  
Activity Bout ◽  
Time Away

Activity of lactating and nonbreeding Peromyscus leucopus was examined under seminatural conditions. Lactating females spent significantly more time away from the nest (307 min/night) than nonbreeding females (173 min/night). Increased time away from the nest was related to an increased duration of each activity bout rather than the number of bouts. Lactating and non-breeding females also showed different responses to meteorological conditions. Time away from the nest by lactating females was not significantly related to litter size or age of litter. The significance of these trends to breeding females and their offspring is discussed.

scholarly journals MATERNAL AGE DRIVES SEASONAL VARIATION IN LITTER SIZE OF PEROMYSCUS LEUCOPUS

10.1644/013 ◽  
2004 ◽  
Vol 85 (5) ◽  
pp. 940-947 ◽  
Author(s):  
M. A. Havelka ◽  
J. S. Millar
Keyword(s):  
Seasonal Variation ◽  
Litter Size ◽  
Maternal Age ◽  
Peromyscus Leucopus

On the Evolution of Litter Size in Peromyscus leucopus

Evolution ◽  
1978 ◽  
Vol 32 (1) ◽  
pp. 45 ◽  
Author(s):  
Theodore H. Fleming ◽  
Robert J. Rauscher
Keyword(s):  
Litter Size ◽  
Peromyscus Leucopus

scholarly journals Non genetic factors affecting rabbit reproduction in Algeria

2010 ◽  
Vol 10 (3) ◽  
pp. 103-109 ◽  
Author(s):  
S. Belhadi ◽  
M. Boukir ◽  
L. Amriou
Keyword(s):  
Litter Size ◽  
Environmental Variability ◽  
Physiological State ◽  
Reproductive Traits ◽  
Favourable Effect ◽  
Factors Affecting ◽  
Parity Effect ◽  
Female Total ◽  
Reproductive Life ◽  
Lactating Females

Environmental variability of reproductive traits has been investigated on a pool of 51 does of different origin in a rabbit breeding unit in Tizi Ouzou region. The objective was to estimate the effects of different factors such as kindling season, parity, physiological state of does, and number born alive on characters such as acceptation rate, conception and kindling rate by female, total born alive, stillborn, litter size at weaning, pre-weaning and post-weaning mortality and weekly litter weights from birth to weaning. Mean bunny weight at birth, at weaning and 70 days of age, litter weight at 70 days of age and total litter gain during lactation have also been considered. Results show that kindling season affects only litter size at weaning with favourable effect of autumn ad spring (7.8 vs 6.6). Highest mean weights at birth are recorded in autumn (16.2 g more than others) and highest litter weights at weaning during the three seasons other than summer (700 g more). The highest mean weight at 70 days is obtained in winter (1.9 Kg). For parity effect, we have recorded the greatest conception and kindling rates at the beginning of reproductive life (98.7 and 96.03% respectively). Other performances did not vary according to this factor. Lactating females at mating had the same acceptation, conception and kindling rate and similar litter sizes as no lactating; however, superior values were obtained for non lactating does for litter size. Moreover, differences due to effect of number born alive on weekly mean weights were significant. However, this effect fades down at 70 days of age.

Breeding by Peromyscus in seasonal environments

1979 ◽  
Vol 57 (4) ◽  
pp. 719-727 ◽  
Author(s):  
John S. Millar ◽  
F. B. Wille ◽  
Stuart L. Iverson
Keyword(s):  
Breeding Season ◽  
Litter Size ◽  
Sexual Maturity ◽  
Peromyscus Maniculatus ◽  
Peromyscus Leucopus ◽  
Reproductive Rate ◽  
Reproductive Characteristics ◽  
Breeding Seasons

Reproductive characteristics of Peromyscus maniculatus in Manitoba and Peromyscus leucopus in Ontario were compared in order to determine the extent to which breeding compensates for relatively short breeding seasons. Peromyscus maniculatus had a shorter breeding season than P. leucopus, but frequency of litters, litter size, and age of females at sexual maturity were the same for both species. A comparison of breeding characteristics among Peromyscus from different geographic areas indicated that basic reproductive characteristics do not vary in relation to length of the breeding season.In general, we have no evidence that the basic reproductive characteristics of Peromyscus vary in relation to length of the breeding season. Peromyscus with short breeding seasons, on average, must have a lower annual reproductive rate than Peromyscus with long breeding seasons.

scholarly journals ON THE EVOLUTION OF LITTER SIZE IN PEROMYSCUS LEUCOPUS

Evolution ◽  
1978 ◽  
Vol 32 (1) ◽  
pp. 45-55 ◽  
Author(s):  
Theodore H. Fleming ◽  
Robert J. Rauscher
Keyword(s):  
Litter Size ◽  
Peromyscus Leucopus

Reproductive performance and growth in captive collared lemmings (Dicrostonyx groenlandicus)

1975 ◽  
Vol 53 (6) ◽  
pp. 777-787 ◽  
Author(s):  
J. F. Hasler ◽  
E. M. Banks
Keyword(s):  
Birth Weight ◽  
Litter Size ◽  
Reproductive Performance ◽  
The Third ◽  
Laboratory Colony ◽  
Dicrostonyx Groenlandicus ◽  
Lactating Females ◽  
Males And Females ◽  
Postpartum Estrus ◽  
Long Photoperiod

Various aspects of reproduction and growth were studied in a laboratory colony of collared lemmings (Dicrostonyx groenlandicus). Males and females were maintained successfully as breeding pairs, and as many as 17 successive litters were produced by one pair. Litter size increased with parity through the third litter and decreased after the eighth. Gestation, which was 19.5 to 21.5 days in non-lactating females, was extended to a maximum of 23 days in lactating females. Postpartum estrus continued throughout the duration of lactation in some females. Males made up less than 38% of the total number of lemmings produced in the colony, regardless of litter size or age at sexing. There was a significant amount of heterogeneity in the sex ratios produced by different pairs of lemmings. Rabbit chow increased reproductive performance compared with a fresh produce diet. Reproductive performance was increased by long photoperiod compared with short photoperiod. Birth weight was independent of litter size but weaning weight was negatively correlated with size of the litter.

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