By Jo Cleland
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With detailed fish-like tails, chainsaw enamel, a stinky musk, and excellent construction abilities, beavers are not like the other creature on this planet. now not strangely, the extreme beaver has performed a desirable function in human historical past and has encouraged a wealthy cultural culture for millennia.
In Beaver, Rachel Poliquin explores 4 unprecedented beaver positive factors: beaver musk, beaver fur, beaver structure, and beaver ecology, tracing the lengthy evolutionary background of the 2 dwelling species and revealing them to be survivors able to withstanding ice a while, significant droughts, and all predators, other than one: people.
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at the black markets of Southeast Asia, rhino horn is worthy greater than gold, cocaine and heroin. this is often the chilling tale of a greater than two-year-long research right into a harmful felony underworld the place cruel syndicates will cease at not anything to achieve their prize. it's a story of greed, folly and corruption, and of an more and more determined conflict to save lots of the rhino – which has survived for greater than 50 million years – from extinction. Killing for revenue is a meticulous, devastating and revelatory account of 1 of the world's such a lot secretive trades. It exposes poachers, gangsters, con males, mercenaries, killers, gunrunners, diplomats, executive officers and different key avid gamers in the back of the slaughter. And it follows the bloody path from front strains of the rhino wars in South Africa, Zimbabwe and Mozambique to the medication markets of Vietnam and the lair of a wildlife-trafficking kingpin at the banks of the Mekong River in Laos …
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Evaluation: Lizards showcases a few 30 of the main interesting lizards, together with chameleons, geckos, skinks, anoles, iguanas, Komodos, and different displays, and extra. advent -- Lizards And people -- actual features and behaviour -- form and dimension -- dermis and shade -- Limbs and locomotion -- Eyes and imaginative and prescient -- Ears and listening to -- odor and style -- the teeth and venom -- Tails and autotomy -- inner anatomy -- Thermoregulation -- replica -- communique -- protection options -- Predation -- Hibernation -- households And Species -- Jackson's chameleon -- Panther chameleon -- Flap-necked chameleon -- Mountain chameleon -- eco-friendly anole -- Jamaican big anole -- Madagascan colossal day gecko -- Crested gecko -- Leopard gecko -- Fat-tailed gecko -- Namib barren region gecko -- Five-lined skink -- Prehensile-tailed skink -- Gila monster -- jap glass lizard -- Short-horned lizard -- Collared lizard -- Six-lined racerunner -- Fence lizard -- Granite spiny lizard -- Lava lizards -- eco-friendly iguana -- Marine iguana -- Galapagos land iguanas -- Rhinoceros iguana -- Black tree video display -- Gould's display screen -- Crocodile visual display unit -- Komodo dragon -- Lizard Conservation -- Bibliography -- Index -- in regards to the writer and photographer
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Additional info for Achoo!
Such ability to increase the conception rate by reducing embryo mortality is clear evidence that not all embryonic mortality in cattle is predetermined. However, not all studies with GnRH have shown unequivocal evidence of increased pregnancy rates. In fact, a review of earlier literature had led Drost and Thatcher (1992) to conclude that there was no clear evidence that treatment with GnRH between days 11 and 14 after breeding would result in increased conception rates. Ellington et al. (1 99 l), in the USA, evaluated the use of a GnRH analogue in recipient cattle and recorded a non%gni5cant tendency for conception rates to increase.
Of heifers inseminated No. of heifers with embryos (“’0) Fertilization rate (%) No. 05). rates have varied from 83% to loo%, with an overall mean of 90%. In Ireland, workers recorded a fertilization rate of 90% in heifers, using AI with frozenthawed semen (Diskin and Sreenan, 1980). The same workers concluded that fertilization failure accounts for only about 10% of the overall reproductive failure in heifers whereas embryo deaths account for more than 30%. Available evidence suggests that fertilization failure probably accounts for about 10-1 2% of conception failure and shows little difference between heifers and cows or between the use of frozen-thawed semen and the bull in natural service.
The evidence suggests that there is probably synchronization of sperm movement and ovulation in the cow, which has the effect of bringing relatively small numbers of sperm from the reservoir in the caudal isthmus to the ampullary region of the oviduct (see Fig. 5). In nature, Chapter 1 14 Fig. 5. Diagrammatic representation of the sperm reservoir in the isthmus and site of fertilization in the ampulla of the oviduct. the cow is served by the bull during the period of oestrus and sperm would normally be in the reproductive tract several hours prior to the occurrence of ovulation (which occurs about 10-12 hours after the end of the heat period).
Achoo! by Jo Cleland