A healthy population of captive Amur tigers might assist recovery of the wild population in Northeast China if individuals were properly prepared and considered suitable for release in the wild.We analyzed the breedin...A healthy population of captive Amur tigers might assist recovery of the wild population in Northeast China if individuals were properly prepared and considered suitable for release in the wild.We analyzed the breeding records of 68 female Amur tigers from 1995 to 2010 in the Hengdaohezi Felid Breeding Center of China and compared the reproductive parameters of this population to wild female Amur tigers.We found that the reproductive parameters of the captive population(the age of first parturition,length of gestation and litter survival rate)were not significantly different from those of wild Amur tigers.Differences in birth date and litter size between wild and captive populations may be caused by management protocols for the captive population or insufficient field data from the wild population.Reproductive parameters of females giving birth after losing a litter were similar to parameters of females that did not lose a litter,except for birth date.These results provide no indication of major problems in using captive females for a breeding program for release of cubs into the wild,but additional information is still needed to assess their suitability.展开更多
[Objective] The aim was to evaluate the health of transgenic sFat-1 gene pigs in order to provide a reference for the breeding selection of pig excellent individuals. [Method] 15 physiological biochemical parameters a...[Objective] The aim was to evaluate the health of transgenic sFat-1 gene pigs in order to provide a reference for the breeding selection of pig excellent individuals. [Method] 15 physiological biochemical parameters and reproductive performances of 21 negative control pigs and 20 transgenic sFat-1 gene pigs were determined. [Result] The liver functions of some transgenic sFat-1 gene pigs were hurted lightly,and the reproductive performance also decreased lightly. [Conclusion] The determination of physiological biochemical parameters and reproductive performance in transgenic pigs could be taken as one of effective methods in environmental safety evaluation of transgenic pigs.展开更多
In the current research,we investigated the impact of gradually increasing inbreeding on the life span and reproductive rate of yellow steppe lemmings,Eolagurus luteus,that reproduced in the Moscow Zoo.The focal capti...In the current research,we investigated the impact of gradually increasing inbreeding on the life span and reproductive rate of yellow steppe lemmings,Eolagurus luteus,that reproduced in the Moscow Zoo.The focal captive colony existed from 2017 to 2021.The studied animals belonged to the second to tenth generations.The founders of the colony were 5 females and 5 males originating from 3 females and 4 males livetrapped in the Zaisan basin(Kazakhstan).The degree of their descendant relatedness progressively increased.The animals intended to be used for reproduction were distributed to pairs with unfamiliar partners.We constructed the pedigree of 177 individuals and calculated their inbreeding coefficients.This parameter varied from O to 0.29,and the maximum values were registered in the lemmings of the seventh to tenth generations.We measured the life span of 61 individuals and used information about the reproduction or its absence in 45 pairs.A substantial decline in individual life span and reproductive parameters in the breeding pairs,along with a progressive increase in the inbreeding coefficients,was registered.The number of delivered litters,born pups,and young lived up to the age of puberty significantly depended on the level of mother inbreeding.The noticeable traits of inbreeding depression in the colony appeared in 2019-2020 when the offspring inbreeding coefficients reached approximately 0.2.Therefore,we assume that if the E.luteus population originates from a relatively small number of noninbred and unfamiliar individuals,then successful reproduction without significant inbreeding depression will continue for several generations of offspring.展开更多
In order to tease apart proximate vs. ultimate sources of variation in reproductive strategy, studies have increasingly focused on populations rather than species as the unit of interest. The reproductive parameters o...In order to tease apart proximate vs. ultimate sources of variation in reproductive strategy, studies have increasingly focused on populations rather than species as the unit of interest. The reproductive parameters of Phrynocephalus przewalskii （Agamidae） in different populations within the same phylogenetic clade were compared in this study. Female SVL, clutch size, egg volume and clutch volume varied significantly among populations. With increase in latitude, clutch size increased, while egg size decreased. Relatively fewer but larger eggs were produced with increasing of population density. Food availability had positive effects on clutch size, but no effect on egg size. Our result indicated that latitude, food availability and population density may be the proximate factors affecting the reproductive parameters ofP. przewalskii.展开更多
Plectranthus esculentus N.E.Br, locally known as “Impombo” is an important indigenous food crop in Rwanda which is currently endangered. One major factor that causes disappearance of this species, is the lower agron...Plectranthus esculentus N.E.Br, locally known as “Impombo” is an important indigenous food crop in Rwanda which is currently endangered. One major factor that causes disappearance of this species, is the lower agronomic recommendations developed for growers and lack of information about nutrients contents leading to loss of interest in its cultivation. The objective of this study was to evaluate the response of living stone potato to inorganic manure fertilizers as an attempt to conserve and evaluate the potential of the crop food security crop, source of income, and its adaptation in the mid-altitude zone of Rwanda. The performance of the crop was evaluated under application of NPK (17:17:17) and farm yard manure fertilisers. These fertilizers were evaluated using a Randomized Completely Block Design (RCBD) with three replications. Analyse of variance showed that significant at (p < 0.01) was recorded in stem height, number of leaves but not high in stem diameter. The results indicated that vegetative growth and yield of plants in control plots were lower than what was obtained in treated plots. Production of living stone potato on large under application NPK (17.17.17) and organic fertlizer will ensure the conservation of genetic resources, food security, agricultural development and financial benefit to local farmers.展开更多
基金We are grateful for support provided through the Fundamental Research Funds for the Central Universities of China(2572014EA06 and 2572014AA14),the National Natural Science Foundation of China(NSFC31272336,31572285)and the"Study on Resource Survey Technology for Tiger and Amur Leopard Population"and"Standard of Tiger and Amur Leopard Population and Habitat Survey and Data Summarization"(State Forestry Administration).
文摘A healthy population of captive Amur tigers might assist recovery of the wild population in Northeast China if individuals were properly prepared and considered suitable for release in the wild.We analyzed the breeding records of 68 female Amur tigers from 1995 to 2010 in the Hengdaohezi Felid Breeding Center of China and compared the reproductive parameters of this population to wild female Amur tigers.We found that the reproductive parameters of the captive population(the age of first parturition,length of gestation and litter survival rate)were not significantly different from those of wild Amur tigers.Differences in birth date and litter size between wild and captive populations may be caused by management protocols for the captive population or insufficient field data from the wild population.Reproductive parameters of females giving birth after losing a litter were similar to parameters of females that did not lose a litter,except for birth date.These results provide no indication of major problems in using captive females for a breeding program for release of cubs into the wild,but additional information is still needed to assess their suitability.
基金Supported by National GMO Cultivation of New Varieties of Major Projects Subproject Environmental Safety Assessment of Genetically Modified Pigs Technology (2008ZX08011-004)~~
文摘[Objective] The aim was to evaluate the health of transgenic sFat-1 gene pigs in order to provide a reference for the breeding selection of pig excellent individuals. [Method] 15 physiological biochemical parameters and reproductive performances of 21 negative control pigs and 20 transgenic sFat-1 gene pigs were determined. [Result] The liver functions of some transgenic sFat-1 gene pigs were hurted lightly,and the reproductive performance also decreased lightly. [Conclusion] The determination of physiological biochemical parameters and reproductive performance in transgenic pigs could be taken as one of effective methods in environmental safety evaluation of transgenic pigs.
基金carried out within the framework of the theme of a State Assignment of the Severtsov Institute of Ecology and Evolution,Russian Academy of Sciences,"Ecological and Evolutionary Aspects of Animal Behavior and Communication,"project no.AAAA-A18-118042690110-1.
文摘In the current research,we investigated the impact of gradually increasing inbreeding on the life span and reproductive rate of yellow steppe lemmings,Eolagurus luteus,that reproduced in the Moscow Zoo.The focal captive colony existed from 2017 to 2021.The studied animals belonged to the second to tenth generations.The founders of the colony were 5 females and 5 males originating from 3 females and 4 males livetrapped in the Zaisan basin(Kazakhstan).The degree of their descendant relatedness progressively increased.The animals intended to be used for reproduction were distributed to pairs with unfamiliar partners.We constructed the pedigree of 177 individuals and calculated their inbreeding coefficients.This parameter varied from O to 0.29,and the maximum values were registered in the lemmings of the seventh to tenth generations.We measured the life span of 61 individuals and used information about the reproduction or its absence in 45 pairs.A substantial decline in individual life span and reproductive parameters in the breeding pairs,along with a progressive increase in the inbreeding coefficients,was registered.The number of delivered litters,born pups,and young lived up to the age of puberty significantly depended on the level of mother inbreeding.The noticeable traits of inbreeding depression in the colony appeared in 2019-2020 when the offspring inbreeding coefficients reached approximately 0.2.Therefore,we assume that if the E.luteus population originates from a relatively small number of noninbred and unfamiliar individuals,then successful reproduction without significant inbreeding depression will continue for several generations of offspring.
文摘In order to tease apart proximate vs. ultimate sources of variation in reproductive strategy, studies have increasingly focused on populations rather than species as the unit of interest. The reproductive parameters of Phrynocephalus przewalskii （Agamidae） in different populations within the same phylogenetic clade were compared in this study. Female SVL, clutch size, egg volume and clutch volume varied significantly among populations. With increase in latitude, clutch size increased, while egg size decreased. Relatively fewer but larger eggs were produced with increasing of population density. Food availability had positive effects on clutch size, but no effect on egg size. Our result indicated that latitude, food availability and population density may be the proximate factors affecting the reproductive parameters ofP. przewalskii.
文摘Plectranthus esculentus N.E.Br, locally known as “Impombo” is an important indigenous food crop in Rwanda which is currently endangered. One major factor that causes disappearance of this species, is the lower agronomic recommendations developed for growers and lack of information about nutrients contents leading to loss of interest in its cultivation. The objective of this study was to evaluate the response of living stone potato to inorganic manure fertilizers as an attempt to conserve and evaluate the potential of the crop food security crop, source of income, and its adaptation in the mid-altitude zone of Rwanda. The performance of the crop was evaluated under application of NPK (17:17:17) and farm yard manure fertilisers. These fertilizers were evaluated using a Randomized Completely Block Design (RCBD) with three replications. Analyse of variance showed that significant at (p < 0.01) was recorded in stem height, number of leaves but not high in stem diameter. The results indicated that vegetative growth and yield of plants in control plots were lower than what was obtained in treated plots. Production of living stone potato on large under application NPK (17.17.17) and organic fertlizer will ensure the conservation of genetic resources, food security, agricultural development and financial benefit to local farmers.
