Document
... Background: The fertilization success in sperm competition in externally fertilizing fish depends on number and quality of sperm. The time delay between sequential ejaculations may further influence the outcome of sperm competition. Such a time interval can load the raffle over fertilization if fert ...
... Background: The fertilization success in sperm competition in externally fertilizing fish depends on number and quality of sperm. The time delay between sequential ejaculations may further influence the outcome of sperm competition. Such a time interval can load the raffle over fertilization if fert ...
Title:Breeding Gilt Evaluation
... 4. What problems may arise from a fat uddered gilt? A fat uddered gilt will have problems producing and lactating more than just a few times. The fat uddered section will break down and be more prone to mastitis. 5. List the common defects/flaws that arise in underlines. 1. Pin nipple 2. Blind nippl ...
... 4. What problems may arise from a fat uddered gilt? A fat uddered gilt will have problems producing and lactating more than just a few times. The fat uddered section will break down and be more prone to mastitis. 5. List the common defects/flaws that arise in underlines. 1. Pin nipple 2. Blind nippl ...
Universal scaling of production rates across mammalian lineages
... Figure 4a,b shows variation in the different components of fecundity. Litter size (figure 4a) is highly variable and scales more steeply in marsupials than in placentals, and the number of litters per year (figure 4b) overlaps greatly between marsupials and placentals of small body size, but is appr ...
... Figure 4a,b shows variation in the different components of fecundity. Litter size (figure 4a) is highly variable and scales more steeply in marsupials than in placentals, and the number of litters per year (figure 4b) overlaps greatly between marsupials and placentals of small body size, but is appr ...
The love-darts of land snails: integrating physiology, morphology
... have spines on their penes that damage the female tract (Crudgington and SivaJothy, 2000; Hotzy and Arnqvist, 2009). A comparative analysis by Rönn et al. (2007) revealed that females belonging to species in which males have more elaborate penial spines had a thicker connective tissue layer in the v ...
... have spines on their penes that damage the female tract (Crudgington and SivaJothy, 2000; Hotzy and Arnqvist, 2009). A comparative analysis by Rönn et al. (2007) revealed that females belonging to species in which males have more elaborate penial spines had a thicker connective tissue layer in the v ...
Color and Communication in Habronattus Jumping Spiders: Tests of
... broadly divided into either sexual selection (Andersson 1994) or ecological selection (Slatkin 1984). Sexual selection drives the evolution of traits via malemale combat over access to females, such as the antlers of deer or the horns of rhinoceros beetles (reviewed in Emlen 2008), or via female cho ...
... broadly divided into either sexual selection (Andersson 1994) or ecological selection (Slatkin 1984). Sexual selection drives the evolution of traits via malemale combat over access to females, such as the antlers of deer or the horns of rhinoceros beetles (reviewed in Emlen 2008), or via female cho ...
Asexual reproduction - Wikipedia, the free encyclopedia
... Brachionus species) and a few types of insects, such as aphids which will, under certain conditions, produce eggs that have not gone through meiosis, thus cloning themselves. The cape bee Apis mellifera subsp. capensis can reproduce asexually through a process called thelytoky. A few species of amph ...
... Brachionus species) and a few types of insects, such as aphids which will, under certain conditions, produce eggs that have not gone through meiosis, thus cloning themselves. The cape bee Apis mellifera subsp. capensis can reproduce asexually through a process called thelytoky. A few species of amph ...
Long-Tailed Weasel - Vermont Fish and Wildlife
... delayed implantation. During this period, the embryo will not develop until the eggs are ready. This unique process allows the female to give birth when environmental conditions are at their most favorable. The female constructs a nest made of grass and leaves and lines it with rodent and rabbit fur ...
... delayed implantation. During this period, the embryo will not develop until the eggs are ready. This unique process allows the female to give birth when environmental conditions are at their most favorable. The female constructs a nest made of grass and leaves and lines it with rodent and rabbit fur ...
Multiple Pregnancy and Birth: Twins, Triplets, and
... and high-order multiple births have increased at an even higher rate. There are more multiple births today in part because more women are receiving infertility treatment, which carries a risk of multiple pregnancy. However, since the first publication in 1998 of the American Society for Reproductive ...
... and high-order multiple births have increased at an even higher rate. There are more multiple births today in part because more women are receiving infertility treatment, which carries a risk of multiple pregnancy. However, since the first publication in 1998 of the American Society for Reproductive ...
Strobilation in a species of Bougainvillioidea (Cnidaria
... of their apical portions (Ritchie, 1915). Other examples of “decapitation” are found in the free hydranths of Euphysa (Brinckmann-Voss, 1967), and in those of Ectopleura larynx (Ellis and Solander, 1786) (cf. Tardent, 1963, 1965; Mackie, 1966; Rungger, 1969, all as Tubularia larynx). In our hydroids ...
... of their apical portions (Ritchie, 1915). Other examples of “decapitation” are found in the free hydranths of Euphysa (Brinckmann-Voss, 1967), and in those of Ectopleura larynx (Ellis and Solander, 1786) (cf. Tardent, 1963, 1965; Mackie, 1966; Rungger, 1969, all as Tubularia larynx). In our hydroids ...
Common Clownfish Amphiprion ocellaris
... including zooplankton, copepods and isopods. Predators: Predators to clownfish include larger fish, sharks, and rays. Life Span: In the wild, clownfish can live to between 6 and 10 years of age. Reproduction: Common Clownfish are protandrous hermaphrodites, meaning that all clownfish are born with a ...
... including zooplankton, copepods and isopods. Predators: Predators to clownfish include larger fish, sharks, and rays. Life Span: In the wild, clownfish can live to between 6 and 10 years of age. Reproduction: Common Clownfish are protandrous hermaphrodites, meaning that all clownfish are born with a ...
Lesson 2 | Asexual Reproduction
... allowing us to ultimately decipher the genetic makeup of the mammoth.” The baby mammoth, named Lyuba, once again raised hopes of cloning a mammoth. Dr. Ian Barnes of the University of London stated that he now believes a mammoth will be cloned in his lifetime. ...
... allowing us to ultimately decipher the genetic makeup of the mammoth.” The baby mammoth, named Lyuba, once again raised hopes of cloning a mammoth. Dr. Ian Barnes of the University of London stated that he now believes a mammoth will be cloned in his lifetime. ...
Lifetime Reproductive Effort
... the variation of LRE (tables 1, A1, A2). However, due to the inherently high measurement error, distilling such meaning from our estimates is not feasible with our current data. In table 1 we give the mean and standard deviation for the six mammalian orders and seven lizard families for which we hav ...
... the variation of LRE (tables 1, A1, A2). However, due to the inherently high measurement error, distilling such meaning from our estimates is not feasible with our current data. In table 1 we give the mean and standard deviation for the six mammalian orders and seven lizard families for which we hav ...
Life Science: Session 4
... the sperm fertilizes the egg, it gives rise to a diploid cell containing genetic information from both the parents. The diploid copy of genes favors evolution of a dominant species with less number of mutations and genetic defects. Thus, recombination of genes is very important in masking the recess ...
... the sperm fertilizes the egg, it gives rise to a diploid cell containing genetic information from both the parents. The diploid copy of genes favors evolution of a dominant species with less number of mutations and genetic defects. Thus, recombination of genes is very important in masking the recess ...
spider monkey fact sheet - World Animal Foundation
... supervision and mental stimulation. They usually require a large amount of attention. Monkeys cannot handle being away from their owners for long periods of time, such as family trips for example, due to their need of attention. Bored monkeys can become extremely destructive and may even go so far a ...
... supervision and mental stimulation. They usually require a large amount of attention. Monkeys cannot handle being away from their owners for long periods of time, such as family trips for example, due to their need of attention. Bored monkeys can become extremely destructive and may even go so far a ...
The Naked Mole-Rat: A New Long-Living Model for Human Aging
... from the breeding female who nurses them but also from their siblings who collect food and carry it to the nest. Most offspring remain in the colony until they die, although a few individuals, regarded as dispersomorph castes, might leave their natent colony to form new colonies (21). Breeding suppr ...
... from the breeding female who nurses them but also from their siblings who collect food and carry it to the nest. Most offspring remain in the colony until they die, although a few individuals, regarded as dispersomorph castes, might leave their natent colony to form new colonies (21). Breeding suppr ...
Negligible senescence in the longest living rodent, the
... mortality rate. It was questioned whether the longest living rodent, the naked mole-rat, met these three strict criteria. Naked mole-rats live in captivity for more than 28.3 years, »9 times longer than similar-sized mice. They maintain body composition from 2 to 24 years, and show only slight age-r ...
... mortality rate. It was questioned whether the longest living rodent, the naked mole-rat, met these three strict criteria. Naked mole-rats live in captivity for more than 28.3 years, »9 times longer than similar-sized mice. They maintain body composition from 2 to 24 years, and show only slight age-r ...
life-history adaptations to arboreality in snakes
... using a flexible tape, except for body width and height, which were measured with vernier calipers. Unfortunately, some species (e.g., Asian and African Python) are rare in collections, so could not be included in our analysis. (For lists of species, see Appendices A and B.) We also measured the posi ...
... using a flexible tape, except for body width and height, which were measured with vernier calipers. Unfortunately, some species (e.g., Asian and African Python) are rare in collections, so could not be included in our analysis. (For lists of species, see Appendices A and B.) We also measured the posi ...
Patient Information For Egg Donors And Donor Egg
... cycles of both the donor and the recipient. This ensures that the embryos are placed in the recipient’s womb at the optimal time for implantation. This is achieved by the use of birth control pills and Lupron, which makes the ovaries inactive. When both the donor and recipient’s cycles are regulated ...
... cycles of both the donor and the recipient. This ensures that the embryos are placed in the recipient’s womb at the optimal time for implantation. This is achieved by the use of birth control pills and Lupron, which makes the ovaries inactive. When both the donor and recipient’s cycles are regulated ...
Resting and denning sites of European mink in the northern Iberian
... Eight den sites were within brambles (7 on slopes in lagoons and tributaries, 1 on the edge of an irrigation ditch) and one between reeds in a riverbank. In most cases, it was not possible to determine if there were associated burrows, although in two cases burrows were clearly observed. The 10th br ...
... Eight den sites were within brambles (7 on slopes in lagoons and tributaries, 1 on the edge of an irrigation ditch) and one between reeds in a riverbank. In most cases, it was not possible to determine if there were associated burrows, although in two cases burrows were clearly observed. The 10th br ...
The use of uterine scars to explore fecundity levels in invasive alien
... In 2014, we analysed uterine scars of 49 female grey squirrels trapped in three different sites in Lombardy and of 40 Pallas’s squirrels from the only population in Varese province, Lombardy, Northern Italy. All the analysed animals were culled at the end of the last breeding season (mid September – ...
... In 2014, we analysed uterine scars of 49 female grey squirrels trapped in three different sites in Lombardy and of 40 Pallas’s squirrels from the only population in Varese province, Lombardy, Northern Italy. All the analysed animals were culled at the end of the last breeding season (mid September – ...
Katy Did, Katy Didn`t
... northern part of its range to three months later in the south. For this reason, katydids are also occasionally called frost bugs. There are about 30 species of katydids in our area, including meadow katydids, conehead katydids, false katydids, and shieldback katydids—but common true katydids are by ...
... northern part of its range to three months later in the south. For this reason, katydids are also occasionally called frost bugs. There are about 30 species of katydids in our area, including meadow katydids, conehead katydids, false katydids, and shieldback katydids—but common true katydids are by ...
1 Assignment Discovery Online Curriculum Lesson title: In Vitro
... infertile. Doctors perform many tests to discover the cause of a couple's infertility, including monitoring ovulation, hormone production, and hormone levels of the egg and the sperm donors (the woman and the man). Doctors usually look for physical reasons for the infertility by performing a physica ...
... infertile. Doctors perform many tests to discover the cause of a couple's infertility, including monitoring ovulation, hormone production, and hormone levels of the egg and the sperm donors (the woman and the man). Doctors usually look for physical reasons for the infertility by performing a physica ...
Reproductive suppression
Reproductive Suppression involves the prevention or inhibition of reproduction in otherwise healthy adult individuals. It includes delayed sexual maturation (puberty) or inhibition of sexual receptivity, facultatively increased interbirth interval through delayed or inhibited ovulation or spontaneous or induced abortion, abandonment of immature and dependent offspring, mate guarding, selective destruction and worker policing of eggs in some eusocial insects or cooperatively breeding birds, and infanticide (see also infanticide (zoology)), and infanticide in carnivores) of the offspring of subordinate females either by directly killing by dominant females or males in mammals or indirectly through the withholding of assistance with infant care in marmosets and some carnivores.The Reproductive Suppression Model argues that “females can optimize their lifetime reproductive success by suppressing reproduction when future [physical or social] conditions for the survival of offspring are likely to be greatly improved over present ones”. When intragroup competition (competition between individuals belonging to the same group) is high it may be beneficial to suppress the reproduction of others, and for subordinate females to suppress their own reproduction until a later time when social competition is reduced. This leads to reproductive skew within a social group, with some individuals having more offspring than others. The cost of reproductive suppression to the individual is lowest at the earliest stages of a reproductive event and reproductive suppression is often easiest to induce at the pre-ovulatory or earliest stages of pregnancy in mammals, and greatest after a birth. Therefore, neuroendocrine cues for assessing reproductive success should evolve to be reliable at early stages in the ovulatory cycle.Reproductive suppression occurs in its most extreme form in eusocial insects such as termites, hornets and bees and the mammalian naked mole rat which depend on a complex division of labor within the group for survival and in which specific genes, epigenetics and other factors are known to determine whether individuals will permanently be unable to breed or able to reach reproductive maturity under particular social conditions, and cooperatively breeding fish, birds and mammals in which a breeding pair depends on helpers whose reproduction is suppressed for the survival of their own offspring. In eusocial and cooperatively breeding animals most non-reproducing helpers engage in kin selection, enhancing their own inclusive fitness by ensuring the survival of offspring they are closely related to. Wolf packs suppress subordinate breeding.