scholarly journals Effect of transatlantic transport on reproduction of agouti and nonagouti deer mice, Peromyscus maniculatus

1998 ◽  
Vol 32 (1) ◽  
pp. 55-64 ◽  
Author(s):  
V. Hayssen
Keyword(s):  
Litter Size ◽  
Peromyscus Maniculatus ◽  
Deer Mice ◽  
Litter Production ◽  
Transport Stress ◽  
Air Freight ◽  
The Uk ◽  
Size At Birth ◽  
Better Than

In conjunction with establishing colonies of deer mice in the UK, effects of transportation on reproduction in agouti (A) and nonagouti (a) deer mice were assessed. Adults were shipped via ground courier and air freight from Northampton, Massachusetts, USA to Sutton Bonington, Leicestershire, England in February and June. Deer mice were paired upon arrival in Sutton Bonington, whereas matched controls were paired in the original colonies at shipping. To assess reproduction, the following variables were monitored for 110 days for all 96 pairs: number of pairs producing litters, time from pairing to birth, interlitter interval, litter size at birth, and litter size at weaning. Generally, shipping suppressed litter production and delayed its timing, but had less effect on litter size. Overall, 32 of 48 control pairs (67%) produced 69 litters compared with 37 litters from 21 of 48 pairs (44%) after shipping. Pairing-to-first-litter intervals were approximately two oestrous cycles shorter in control animals (39 vs 53 days). Averaged over all litters, litter size was higher in control pairs (4.4 vs 4.0). With respect to genotype, control agouti deer mice were less productive than nonagouti animals, but they reproduced better than nonagoutis after shipping. In control animals, colourmorphs did not differ with respect to litter production or timing, but agouti pairs had smaller litters (first litter: A: 3.1, a: 4.2) and this difference increased at successive litters (third litter A: 3.9, a: 6.0). After shipping, agouti animals produced more litters (A: 22, a: 15), and did so earlier (pairing to birth: A: 47 days, a: 60 days), as well as more frequently (interlitter interval: A: 32 days, a: 51 days). Litter size was also more similar between genotypes after shipping (A: 4.0, a: 4.1). Overall, control agouti animals produced 37% fewer offspring than nonagouti pairs (A: 116 neonates, a: 185 neonates), but after shipping agouti deer mice produced 43% more offspring than nonagouti animals (A: 87 neonates, a: 61 neonates). In sum, transport stress suppressed reproduction for several weeks after shipping and this suppression was exacerbated in nonagouti deer mice.

Comparative demography of Peromyscus maniculatus and Microtus oregoni populations after logging and burning of coastal forest habitats

1980 ◽  
Vol 58 (12) ◽  
pp. 2252-2259 ◽  
Author(s):  
Thomas P. Sullivan
Keyword(s):  
Peromyscus Maniculatus ◽  
Deer Mice ◽  
Burned Area ◽  
Demographic Parameters ◽  
Coastal Forest ◽  
Comparative Demography ◽  
Males And Females ◽  
Demographic Attributes ◽  
Forest Habitats ◽  
Better Than

This study was designed to investigate the abundance and related demographic attributes of Peromyscus maniculatus and Microtus oregoni populations in successional burned and unburned cutover areas. These populations were livetrapped in three habitats at Maple Ridge, British Columbia, from March to October 1978. The average densities of deer mice and Oregon voles per hectare on the burned area were 27.6 and 11.6, and on two unburned areas were 19.1 and 16.0, and 21.9 and 10.4, respectively. There was little variation in the proportion of breeding animals among habitats for either species. Male deer mice survived better on the burned area than in either of the other two habitats; there was little variation in survival among females. Males and females of M. oregoni survived equally well. Deer mice generally had greater proportions of reproductive animals and survived better than Oregon voles on all study areas. However, juvenile voles had 1.7 times higher survival than young deer mice. Demographic parameters within populations of P. maniculatus and M. oregoni tend to be similar in successional burned and unburned habitats 4–5 years after logging.

Effects of endrin feeding on survival and reproduction in the deer mouse, Peromyscus maniculatus

1968 ◽  
Vol 46 (5) ◽  
pp. 951-958 ◽  
Author(s):  
Ralph D. Morris
Keyword(s):  
Cold Stress ◽  
Litter Size ◽  
Peromyscus Maniculatus ◽  
Deer Mouse ◽  
Adult Mortality ◽  
Litter Production ◽  
Postnatal Mortality ◽  
Survival And Reproduction ◽  
Experimental Feeding ◽  
Production Frequency

The effects of endrin on parental survival and fertility, litter size, and young survival to weaning, of field-captured Peromyscus maniculatus osgoodi were studied. Five test groups were used, each containing 13–14 pairs of known-aged mice. The reproductive performance of each group was recorded over a 6-month period from August, 1966, to January, 1967, before endrin feeding. Endrin feeding was at intervals over a 7-month period from February to August, 1967, with standard mouse pellets containing approximately 0, 1, 2, 4, and 7 p.p.m. endrin. All groups were subjected to starvation periods of short duration during the experiment. The experiment was terminated by exposing selected mice from each group to cold stress at 0°F until the mice were dead. Adult mortality during feeding, starvation, and cold stress periods were directly proportional to the level of endrin supplied in food. Within each group, litter production frequency and mean litter size before and during experimental feeding were similar. Evidence is presented that at higher endrin levels postnatal mortality of young before weaning occurs. Suggestions about the mechanism of this effect are proposed.

Intraspecific variation in body size, metabolic rate, and reproduction of deer mice (Peromyscus maniculatus)

1990 ◽  
Vol 68 (2) ◽  
pp. 381-388 ◽  
Author(s):  
Michael Earle ◽  
D. M. Lavigne
Keyword(s):  
Body Size ◽  
Metabolic Rate ◽  
Litter Size ◽  
Growth Rates ◽  
Peromyscus Maniculatus ◽  
Deer Mice ◽  
Litter Mass ◽  
Dependent Variables ◽  
Interspecific Comparisons ◽  
Developmental Traits

Deer mice (Peromyscus maniculatus) from three populations were used to examine patterns of covariation among body size, metabolic rate, and selected reproductive and developmental traits. Mass at birth and at 21 days, growth rates of individual neonates and whole litters, litter size, interlitter interval, and metabolic rates of adult females were used as dependent variables against maternal mass in allometric equations. Litter mass was positively correlated with maternal mass within each of the three populations. Conversely, litter size, litter mass at 21 days, litter growth rate, interlitter interval, and maternal metabolic rate were correlated with maternal mass in only one or two of the populations. Neonatal traits (mean mass of individuals at birth and at weaning and their growth rates) were consistently independent of maternal mass. There was no significant relationship between any of the reproductive parameters measured and metabolic rate of individual females. These results support the view that patterns of covariation in life history traits, metabolic rate, and maternal mass, which are generally evident in interspecific comparisons, are not necessarily apparent at the level of individuals within a single population.

scholarly journals Dehydrogenase-dependent Ethanol Metabolism in Deer Mice (Peromyscus maniculatus) Lacking Cytosolic Alcohol Dehydrogenase

1989 ◽  
Vol 264 (10) ◽  
pp. 5593-5597
Author(s):  
C Norsten ◽  
T Cronholm ◽  
G Ekström ◽  
J A Handler ◽  
R G Thurman ◽  
...  
Keyword(s):  
Alcohol Dehydrogenase ◽  
Peromyscus Maniculatus ◽  
Ethanol Metabolism ◽  
Deer Mice

Ambient Temperature and Rainfall: An Effect on Sex Ratio and Litter Size in Deer Mice

1985 ◽  
Vol 66 (2) ◽  
pp. 289-298 ◽  
Author(s):  
P. Myers ◽  
L. L. Master ◽  
R. A. Garrett
Keyword(s):  
Sex Ratio ◽  
Ambient Temperature ◽  
Litter Size ◽  
Deer Mice

Genetic Evidence for a Hantavirus Enzootic in Deer Mice (Peromyscus maniculatus) Captured a Decade before the Recognition of Hantavirus Pulmonary Syndrome

Virology ◽  
1994 ◽  
Vol 204 (2) ◽  
pp. 563-568 ◽  
Author(s):  
Vivek R. Nerurkar ◽  
Jin-Won Song ◽  
Ki-Joon Song ◽  
James W. Nagle ◽  
Brian Hjelle ◽  
...  
Keyword(s):  
Peromyscus Maniculatus ◽  
Genetic Evidence ◽  
Hantavirus Pulmonary Syndrome ◽  
Deer Mice

A note on purebred performance of Belgian Piétrain pigs

1977 ◽  
Vol 25 (2) ◽  
pp. 255-258 ◽  
Author(s):  
A. N. Howard ◽  
W. C. Smith
Keyword(s):  
Cross Section ◽  
Litter Size ◽  
Live Weight ◽  
Muscle Quality ◽  
Feed Conversion ◽  
Feeding Regime ◽  
Weight Range ◽  
Breed Difference ◽  
Ad Libitum ◽  
Size At Birth

SUMMARYIn an analysis of data from 211 litters in a Pietrain herd, litter size at birth and at weaning was lower than is generally found in indigenous breeds. Mortality in growing and breeding pigs was high with circulatory failure accounting for 23% and 95% of deaths respectively. Pietrains, fed ad libitum over the live-weight range 27 to 87 kg, grew more slowly by 130 g/day than contemporary Large Whites on the same feeding regime, had higher killing-out percentages (by 3 to 4 units) and larger eye muscles in cross-section (by 9·9 cm2) but tended to have higher feed conversion ratios. There was no breed difference in backfat measurements but Pietrain carcasses were shorter by 83 mm and their muscle quality was markedly inferior to that of the Large Whites.

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