REPRODUCTION IN THE EUROPEAN HARE IN SOUTHERN ONTARIO

1959 ◽  
Vol 37 (5) ◽  
pp. 627-631 ◽  
Author(s):  
J. K. Reynolds ◽  
R. H. Stinson
Keyword(s):  
Reproductive Biology ◽  
Breeding Season ◽  
Litter Size ◽  
Lepus Europaeus ◽  
European Hare ◽  
Southern Ontario ◽  
Adult Weight ◽  
The Third ◽  
In Captivity

Certain aspects of the reproductive biology and growth of the European hare, Lepus europaeus hybridus Desmarest, were studied in 1949–52 in southwestern Ontario. The breeding season began in January and declined in August, reaching its height between the second week of February and the third week of June when all females examined were pregnant. The litter size varied from one to four; an average of 1.6 foetuses occurred in the early litters (January–March) and 3.8 in later litters (April–June). One young raised in captivity grew to adult weight (4100 g) in 6 months.

scholarly journals Karyological comparisons of the European hare (Lepus europaeus Pallas, 1778) from the Asian part of Turkey, with morphological contributions

2012 ◽  
Vol 64 (3) ◽  
pp. 935-942 ◽  
Author(s):  
C. Tez ◽  
Y. Özkul ◽  
O. İbiş
Keyword(s):  
Diploid Number ◽  
Lepus Europaeus ◽  
Brown Hare ◽  
European Hare ◽  
European Brown Hare ◽  
Fundamental Number ◽  
The Third ◽  
Skull Measurements ◽  
Karyological Data ◽  
Acrocentric Chromosomes

We focused on a comparison of karyological data for the European brown hare Lepus europaeus, from the Asian part of Turkey. In Turkish L. europaeus, the diploid number (2n), the fundamental number of chromosomal arms (FN) and the number of autosomal arms (FNa) were determined to be 2n=48, 84 and 80, respectively. The autosomes are composed of three pairs of metacentric chromosomes, four pairs of submetacentric chromosomes, ten pairs of subtelocentric chromosomes and six pairs of acrocentric chromosomes. The X chromosome was a medium-large submetacentric and the Y chromosome was a very small acrocentric. This is the third report for L. europaeus from Turkey and confirmed the previous results with regard to 2n. However, when comparing our findings with those of other authors, there were karyotypic differences among the chromosomes. These differences were related to the number of chromosome arms. Additionally, we present the skull measurements of seven samples for the Turkish brown hare collected from three localities, and these measurements conformed to those of previous studies.

The Number of Young Present in Sequential Litters of the Marsupial Bandicoot, Isoodon macrourus, in Captivity

1984 ◽  
Vol 32 (5) ◽  
pp. 623 ◽  
Author(s):  
RT Gemmell ◽  
MT Walker ◽  
G Johnston ◽  
G Cepon
Keyword(s):  
Breeding Season ◽  
Litter Size ◽  
Adult Female ◽  
In Captivity

Twenty adult female bandicoots, Isoodon macrourus, housed in outside enclosures, were examined weekly and the number, sex and teat position of young were recorded throughout 1982. Thirty-nine litters were monitored throughout lactation. The number of young declined from 107 early in lactation to 73 at weaning. Loss of young from the pouch (n = 19) was more pronounced during the colder months of the year. This reduction in litter size may enable the bandicoots to produce some young in unfavourable conditions and thus extend their breeding season.

Reproductive Biology of the Black Dogfish,Centroscyllium Fabricii, Collected From Waters off Western Greenland

1995 ◽  
Vol 75 (2) ◽  
pp. 285-310 ◽  
Author(s):  
Kazunari Yano
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Breeding Season ◽  
Litter Size ◽  
Reproductive Organs ◽  
Normal Female ◽  
Size At Maturity ◽  
Free Living ◽  
Near Term ◽  
Female Reproductive Organs

The reproductive biology of 1124 male (165–760 mm TL) and 1476 female (175–898 mm TL) black dogfish,Centroscyllium fabricii, was examined. The sharks were caught off western Greenland with bottom otter trawls. Size at maturity was about 550 mm TL in males and 650 mm TL in females. Ovarian ova did not continue to develop during gestation. The sex ratio of embryos was 1:1. Litter size ranged from 4 to 40, with a mean of 16–4. The total number of mature ova, fertilized ova, or embryos tended to increase with size of the females. Development of black dogfish embryos is dependent solely on yolk reserves. Near-term embryos (152–192 mm TL) had completely absorbed their external yolk sacs. The smallest free-living specimens collected in this study were 165 mm TL for males and 175 mm TL for females. The black dogfish does not seem to have a well-defined breeding season. This species displayed a well-defined pattern of depth segregation by size. The sex ratios in five shallow depth strata (500–599, 600–699, 700–799,800–899, and 900–999 m) were 1:1, but those of three deeper depth strata (1000–1099,1100–1199, and 1200–1299 m) contained a significantly greater number of females than males. Four abnormal hermaphrodites possessed gonads containing both testicular and ovarian tis-sues. Two specimens had normal female reproductive organs (e.g. ovaries, oviducts, nidamental glands, and uteri) as well as claspers.

scholarly journals Histopathological findings of Fasciola hepatica infection in non-native European hare (Lepus europaeus) in Southern Chile

2019 ◽  
Vol 28 (1) ◽  
pp. 145-150 ◽  
Author(s):  
Pablo Oyarzún-Ruiz ◽  
Cristina Alvelo ◽  
Frank Vera ◽  
Manuel Moroni
Keyword(s):  
Public Health ◽  
Fasciola Hepatica ◽  
Lepus Europaeus ◽  
Southern Chile ◽  
European Hare ◽  
The Third ◽  
Domestic Ruminants ◽  
Parasitic Load ◽  
Liver Flukes ◽  
Vast Area

Abstract Fasciola hepatica is a parasite introduced in America from Europe, being considered of concern for public health and animal production, especially in countries with endemic areas as occur in Chile. In this country, the research has been focused mainly in domestic ruminants, with native and introduced wildlife being largely ignored. Thus, the aim of this study was to report the infection by Fasciola hepatica in an introduced mammal, the European hare, which is distributed along a vast area of the country. One in 42 hares hunted showed histological lesions compatible with F. hepatica, and harbored a parasitic load of 6 liver flukes. This is the first report of this lagomorph acting as host of this helminth in the country and the third in South America. Yet, we found no previous reports regard the pathology of this fluke in the species. Thus, we emphasize the importance of more studies regarding introduced mammals which could be acting as reservoirs for this important fluke.

The Julia Creek dunnart, Sminthopsis douglasi (Marsupialia : Dasyuridae): breeding of a threatened species in captivity and in wild populations

2015 ◽  
Vol 63 (6) ◽  
pp. 411 ◽  
Author(s):  
P. A. Woolley
Keyword(s):  
Reproductive Biology ◽  
Breeding Season ◽  
Threatened Species ◽  
Cycle Length ◽  
Heavy Rainfall ◽  
Wild Populations ◽  
Reproductive Condition ◽  
In Captivity ◽  
Basic Features

A detailed description of the methods used to house, maintain and assess the reproductive condition of captive Julia Creek dunnarts, Sminthopsis douglasi, that led to successful breeding of the species in captivity is provided. Basic features of the reproductive biology of this species of Sminthopsis have been established from observations made on captive animals. The females are polyoestrous, with a cycle length of ~28 days. Young are born 13–16 days after mating and are dependent on the mother for ~70 days. The age at which captive animals commence breeding ranged from 13 to 38 weeks (females) and 23 to 40 weeks (males). Both sexes are capable of breeding when two years old. Breeding in wild populations is seasonal and occurs over a six-month period from August to March, which encompasses the hottest and wettest time of the year. Both females and males are known to be capable of breeding in more than one season and females have the potential to rear two litters in a season. Recruitment of young to the population may be affected by heavy rainfall during the breeding season that can lead to closure of the cracks and holes in which the dunnarts shelter.

Breeding of Philander frenata (Didelphimorphia, Didelphidae) in captivity

1998 ◽  
Vol 32 (4) ◽  
pp. 434-438 ◽  
Author(s):  
Erika Hingst ◽  
Paulo Sergio D'Andrea ◽  
Ricardo Santori ◽  
Rui Cerqueira
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Litter Size ◽  
Breeding Success ◽  
Gestation Period ◽  
Sex Ratio At Birth ◽  
Laboratory Management ◽  
Sensory Contact ◽  
In Captivity ◽  
Size At Birth

Data on the reproductive biology and laboratory management of Philander frenata are presented here. Sensory contact before pairing increased breeding success and reduced aggression between pairs. Gestation period was 13–14 days, with a post-lactation oestrous. Births occurred only between August and February. Mean litter size at birth and at weaning was 5.5 (SD=2.4) and 4.0 (SD=1.9), respectively. Sex ratio at birth was statistically biased toward males. The timing of weaning was established at between 70 and 80 days old, with the young weighing from 24 g to 49 g.

ADDITIONAL NOTES ON COLEOPTERA TAKEN IN ESSEX COUNTY AND SOUTHERN ONTARIO, CANADA.

1947 ◽  
Vol 79 (7-8) ◽  
pp. 148-149 ◽  
Author(s):  
S. D. Hicks
Keyword(s):  
Essex County ◽  
Southern Ontario ◽  
The Third

This list follows closely on the third of three previously published articles in the Canadian Entomologist. Mr. C. A. Frost of Framingham, Massachusetts, has checked and supplied me with identifications of all but two of the specimens. His generous interest in determining some of the beetles for which names have been difficult to obtain made this paper possible.

A note on growth curves of rabbit lines selected on growth rate or litter size

1993 ◽  
Vol 57 (2) ◽  
pp. 332-334 ◽  
Author(s):  
A. Blasco ◽  
E. Gómez
Keyword(s):  
Growth Rate ◽  
Litter Size ◽  
Growth Curves ◽  
Live Weight ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Standard Errors ◽  
Adult Weight ◽  
Weight Growth ◽  
Using Data

Two synthetic lines of rabbits were used in the experiment. Line V, selected on litter size, and line R, selected on growth rate. Ninety-six animals were randomly collected from 48 litters, taking a male and a female each time. Richards and Gompertz growth curves were fitted. Sexual dimorphism appeared in the line V but not in the R. Values for b and k were similar in all curves. Maximum growth rate took place in weeks 7 to 8. A break due to weaning could be observed in weeks 4 to 5. Although there is a remarkable similarity of the values of all the parameters using data from the first 20 weeks only, the higher standard errors on adult weight would make 30 weeks the preferable time to take data for live-weight growth curves.

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