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The best breedings are generally those where the pedigrees have several outstanding ancestors common to both the sire and dam. This is how breed "type" is set. The formula for establishing and maintaining type, for example, would be the sire's sire should be the same dog as the dam's grandsire. This can be reversed to make a line breeding on the dam's sire as well; known as close line breeding. With this formula, one is able to "set type" within a breed. The type you set can be either good or bad. The goal, of course, is to set a type that is "good." One must know the health histories of these family members, as well as all the good you are trying to set type for. Line and inbreeding can increase the possibility of producing even better dogs, but it also must be realized, through augmentation by percentages, line and inbreeding can produce animals with undesirable characteristics. When few or no ancestors are common to the sire and dam, the breeding is known as an outcross. Some outcrosses are excellent, while others are not. Puppies can resemble the sire, the dam, or a combination of the parents or even a remote ancestor. Line breeding is generally the safest course to practice when both the sire and the dam of the litter share multiple common ancestors. You work with known qualities. With line breeding you will know in advance to some degree what the puppies will look like and how they most likely will behave. Inbreeding is the most misunderstood of all the breeding formulas and should be done by only the most experienced breeders, those who have a very strong grasp of genetics and who have known the direct ancestors for at least the first few generations. Type is firmly set by inbreeding. Good or poor qualities are intensified. There is the opportunity to produce superior puppies, but there is also the risk of producing very poor specimens. The best and worst of the ancestors should be carefully evaluated before using the inbreeding formula. Article Index: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
More Articles:1. Iron deficiency in dogs and cats We have recently seen a number of cases of iron deficiency anaemia, both in cats and dogs.In iron deficiency, red cells do not develop the normal complement of iron–containing haemoglobin and the cells that form in the bone marrow are small (microcytic, low MCV) and hypochromic (low MCH and MCHC). The process of red cell maturation becomes prolonged so young red cells no longer contain large amounts of RNA and therefore do not appear polychromatic. As a result the anaemia is non- regenerative, w… 2. Tips On Breeding Tropical Fish By Tim Lee If you are looking for tips on breeding tropical fish, you must first decide what type of tropical fish you wish to breed. Some tropical fish are live bearers, which means they give birth to live minnow babies. The other type are egg bearers, which means the mother lays eggs and the minnow babies hatch from the eggs.Most sources that provide tips on breeding tropical fish suggest that live bearers are the better place to start, especially for beginners who have limited to no previous breeding… 3. Simple and Effective Solutions for Aquarium Algae By John Morris Eradication of encrusting algae could be done simply by periodically scraping the sides of the aquarium or scrubbing the rocks.For those with plastic plants and a completely white gravel bed, the situation could be more tasking as it would be necessary to bleach the rocks to remove all traces of algae.However, if you do this, do make sure that you rinse the gravel thoroughly afterwards. Bleach is highly toxic, and even small amounts can have a drastic effect on the aquarium fish.Since the prim… 4. Ringworm In Pets By Lee Dobbins Ringworm – Ewww! Just the name conjures up images of a long worm weaving a ring under your skin. In fact, ringworm is not a worm at all, it is actually caused by a fungus which is highly contagious.In humans, ringworm is a ring shaped red rash on the skin, but in your pet it can look like most anything. A common human form of ringworm is otherwise known as athletes foott. Dogs and cats are susceptible to three forms of ringworm, and your cat can pass ringworm on to you, although only a sm… |
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