Гладиатор :

Кот :

Выяснилось, что борзая не так манёвренна, как гепард.

Cмотря какая и смотря где.

а борзая выносливей на порядок и доганяет ту же газель, выматывая её, то есть загоном.

Сто раз уже писал, что грейхаунд быстрее почти любой газели. Про 90 км в час это сказки.

Борзая бежит не так быстро, но долго и газель уже не имеет сил уворачиваться, тут её, усталую, и настигает борзая

Если грейхаунд не поймал спрингбока или сахарскую газель через 1 км, то я думаю, уже вряд ли поймает, имхо. Салюки другое дело.

Дело каждого иметь убеждения, но только специальные тесты и замеры могут доказать быстрее любой газели грейхаунд ( сравнивать в природе) или всё же это преувеличение!

Манёвренность гепарда не превзойдена никакой породой борзых - смотреть инфу на эту тему выше с выкладками физики

Эксперимент который выложил Виктор, косвенно касался и газель.Но, в принцыпе, я с вами согласен, только такие серьёзные эксперименты о чёмто говорят.

Отредактировано Гладиатор (10 June 2015 07:35:50)

U.S. Fish and Wildlife Service,

I recently came upon some information on the internet entitled Fastest Land Animals that I think is misleading and the given source is the FWS. I think the numbers are either incorrect or compare apples and oranges.

The part that is particularly hard to believe is that a Coyote, a small canid whose forte is really endurance, is faster than a greyhound, a sprinting animal that has been bred for coursing for four thousand years. The figure you give for a greyhound, 39.35 mph, is the world record AVERAGE speed over 525 yards on a track including the turns. In the first 100 yards out of the starting box, a racing greyhound approaches 45 mph. A recent race over 80 meters between a greyhound and a racing pigeon capable of speeds to 70 mph, was won by the greyhound presumably because the pigeon took much longer to reach its top speed.

I'd be interested to know how the speed of a coyote was measured. 43 mph seems rather generous. I have an old Disney film that shows a greyhound coursing coyotes and the difference in speed is remarkable. The greyhound seems to close at something between twice and half again the speed of the coyote. If the coyote can run faster than 30 mph I'd be surprised.

Similarly, the speed for the Cape Hunting dog seems inflated. These again, like most wild canid hunters, are animals that require endurance rather than speed to hunt successfully.My guess is that the speeds for such large animals as the Pronghorn Antelope, Wildebeest, Lion, Elk, Hyena, Zebra and Mongolian Wild Ass are also wildy over-optimistic. The musculature of most of these animals is all wrong for sprinting. The formula for speed in the animal kingdom is:

1. A narrow body and head for light weight and wind resistance.
2. Long, narrow legs for leverage. They must also be light so they can be moved easily.
3. Massive thigh and shoulder muscles to propel the skinny legs.
4. The fluidity of spine and torso necessary for a double suspension gallop, ie., where the rear legs actually land in front of the forward legs. The Cheetah is the only creature that can actually fold its spine while running which is what gives it its tremendous speed.
5. Deep chests to house enormous hearts and lungs to provide the oxygen required for the anaerobic requirements of sprinting.

The Lion fails #1 and #2 (their forelegs must be massive and strong to grip and pull down larger prey). Their powerful paws are enormous -- very weighty and inefficient for sprinting in comparison to the tiny paws and hooves of greyhounds and gazelles.The Elk fails #1 and 4 as do the Hyena, Wildebeest, Zebra and Ass. Of the creatures on your list, only the Cheetah, Greyhound, Thoroughbred horse, Thompson's Gazelle, Antelope and Whippet meet the above criteria for sprinting speed. I'd put them in that order for top attainable speeds over short distances.

I find it rather curious that the ancient Egyptians bred coursing dogs similar to the greyhound and the saluki (a dog not nearly as fast as a racing greyhound) for the purpose of coursing hares and small African gazelles. There would've been precious little meat on Pharaoh's table if those ancient dogs couldn't catch them!

Please take another look at these speeds. I don't think they represent the relative top speeds of the animals at all or they compare the average speed of one animal over a longer distance and different conditions to another animal's burst speed over a span of a few yards.

The Heart
In a racing greyhound, the heart output increases from about 200mL per kg body weight per minute at rest to over 1000mL per kg at the full gallop. A greyhound circulates up to 15 litres of blood around its body, or half its own body weight in a 30 second-race.

A racing greyhound circulates its entire blood volume between 4-5 times during a 30 second gallop.

These figures equate to a greyhound pumping its entire blood volume of around 3.4 litres up to 4-5 times around its body during a 30 second gallop. A greyhound's heart weight ranges from 1.18 to 1.73% of body weight, or 270 grams to 519 grams for a 30kg greyhound, which is higher than an elite racehorse at 1.0-1.3% of its body weight.

Other breeds of dogs have a heart weight equal to 0.77% of their body weight, compared to 0.5% for humans.

An average 70kg human athlete has a heart size similar to a 30kg greyhound, but the greyhound's heart delivers blood at almost twice the rate, beating at 310-340 beats/minute at the gallop, compared to humans at 170.210 beats/minute.

Blood Volume
A fit greyhound has the highest blood volume of any athlete, relative to its body size, with blood contributing 11.4%, compared to 10.5% for a racehorse, 9.5% for a human sprint athlete and 7.2% for a normal pet dog.

A greyhound has around 35 x 1012 red blood cells in its body, producing around 5 million replacement red cells per second in its bone marrow and spleen.

A fit greyhound has about 3 litres of blood consisting of around 2 litres red cells, or about 6.6% of its body weight or a PCV of 60% of blood volume. A racehorse has a blood volume of around 55 litres, but a PCV of around 40% when fit, or 4.4% of its body weight.

Track Contact
At a gallop, a racing greyhound is only touching the track surface for 25% of its stride distance, and during the remainder of the stride, it is suspended above the ground until the next limb hits the ground.

Up the straight, a greyhound carries 2.26 times its body weight on the weight bearing front limb at each stride, increasing to 5 times (or roughly 150kg) in downward weight force on its left inside front limb when leaning over around a sharp bend on the track.

A greyhound has a stride length of around 5 metres making 4 strides per second as it accelerates from the traps, decreasing to 3.25 strides per second up the home straight, with each limb touching the ground for about 0.11 seconds.

The forelimbs have a flight distance (off the ground) of 1.23 metres, and the rear legs 2.45 metres or double the distance.

Wrist/Bone Joints
The wrist joint bones on the front limbs sustain pressure of 500psi or 20,000 newtons per square cm when cornering at the gallop.

The wrist and lower limb structures withstand up to 150kg of downward pressure when galloping around a corner, which is created by the centrifugal force in proportion to the speed of the greyhound and the radius of the track circle.

This sideways force is imposed on the greyhound's front limb on the second stride into the corner and if the track surface is unstable or shears, the outward flinging force causes increased sideways pressure on the joint, which can result in injury to the wrist.

Respiratory & Blood Pressure Dynamics
A greyhound draws in 60-90 litres of air in 50-90 breaths in a 30-second gallop, extracting 1500 mLs of oxygen from the air to metabolise the energy in its muscles.

During the gallop, the blood pressure in the lung arteries increases from 7 mm mercury pressure units at rest, to 40 units at the gallop, similar to the pressure peak in a human athlete, but only one third of the maximum pressure in a racehorse's lung artery, which reaches 120 mm mercury pressure, or roughly 2.1 psi of pressure.

A greyhound produces around 100Kcals or 100,000 watts of waste heat energy during a 30 second race, sufficient to bring 600mL of tap water to the boil in around 2 minutes.

After a race, the gut function is restored over a 30 minute period to digest food, but the immune system is depressed for 30-120 minutes after a hard gallop.

Loading stress placed on the limb bones is repaired over a 7-10 day period after a race.

And we wonder why they break down.

М.Ф, все-таки как кондиция моего щена? Нормальная (до хорошей еще далеко) или говно?

Тазы


Дирхаунд



Русская Псовая по волку

Отредактировано Гладиатор (12 June 2015 16:04:20)

Для щенка не плохо выглядит.

Lurchers = 1/4bull, 1/4whippet & 1/2greyhound

Да

Грею в свое время подливали кровь бульдога, чтобы укрупнить костяк и повысить азарт. Такие собаки могли замертво упасть на дорожке, но не сдавались.
Уиппетов-переростков хватает и без грея - до 20 кг.
А гибрид грея с питом это нечто вроде гиеновой собаки - легкое сложение. высокая скорость и очень сильные челюсти.

Гладиатор :

М.Ф :

Да

а какой смысл размывать породную группу или курочить стандарты породы делая дизайнерскую ьорзую с неизвестными параметрами породных качеств? Имею в виду - зачем борзым качества питбуля? Чтобы повысить злобность или вывести неуправляемую фанатичную борзую, которая будет иметь дэд-гейм угонки за дичью? Как то глупо

Зачем Уиппету - качествоа грейхаунда - делать уиппета -переростка или карликово грейхаунда? Или попытка повысить скорость скачки уиппету? Но он и так очень резвый?

Эти собаки для ночного браконьерства