Breeding values and Blup
Animal selection based on breeding value for the best breeders to choose from. The genetic evaluation seeks genetic susceptibility (including genetic and genotype ") of an animal for a particular characteristic or performance to best estimate, which is not measurable. In estimating the genetic predisposition should therefore be supported on the externally visible characteristics of the animal (also known manifestation or phenotype). The phenotype is determined both by the genotype and the environmental influences. Consequently, the environmental impacts as much as possible off to a reliable estimate of the pedigree can be obtained. To the breeding of an animal is first to estimate information gathered by measuring and / or evaluation of externally visible features on the farm. Then the collected data is processed in preparation for the final calculation breeding. The processing consists in checking and trier of basic facts.
The final calculation of genetic indexing is done using a computer program based on the Blup Animal Model. Best Linear Unbiased Blup stands for Prediction and indicates that the true breeding value of an animal in the most pure and precisely estimated. This means that the non-hereditary factors or environmental influences as far as possible be eliminated when estimating breeding values. Animal model and characterize the animal model is that the three sources of information used: in-house services of the sheep, the performance of the parents and other relatives and performance of the offspring. For each breeding value of an individual animal is the reliability (expressed as a number between 0 and 99% and represented by R) is calculated. The reliability depends on the amount of processed information in the genetic evaluation and the heritability of characteristics to a genetic calculated. It is evident that as further information about the performance of an animal and its relatives is known, the estimated genetic predisposition (the genetic) closely to the actual genetic predisposition will be similar and the reliability of breeding value will be greater. Characteristics that are slightly genetically determined, have a low heritability. Differences in appearance are mainly due to differences in environmental conditions caused. Such features, information is extremely important for relatives to come to a reliable breeding value.
In Britain it has been doing for several decades at Bais breeding values of the sheep breeding improvement. Also for the Suffolk slachtlamvaderdier as an animal model is developed. Data from all his pedigree Suffolks it imported. This system supplied and wealth of information and is consulted on the Internet for everyone. BASCO's hot and the consultation click here.
In the Netherlands, Gert Winter of ISG with the Animal Science Group of Wageningen University slachtlamdiermodel also built.
On both projects we take part.
Conclude yourself that when you choose a ram which he demonstrated in the meat / grease compared to the best part, you as a professional (mongrels) breeder just money poses a ram to use!