Bulk breeding method. Pedigree Method of Plant Breeding 2022-10-23

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Bulk breeding is a method of animal breeding that involves the production of large numbers of offspring in a single breeding event. This method is often used in the production of livestock, such as cattle, pigs, and poultry, as well as in the breeding of certain species of fish and other animals.

One of the main advantages of bulk breeding is that it allows for the rapid production of a large number of offspring, which can be used for various purposes such as meat production, egg production, or the development of new breeds or strains. This can be particularly useful in the case of livestock, where the demand for meat and other animal products is high and the need for a constant supply is critical.

Another advantage of bulk breeding is that it allows for the selection of traits that are desirable in the resulting offspring. For example, in the case of livestock, breeders may choose to produce animals with traits such as high growth rate, good feed conversion efficiency, or improved disease resistance. Similarly, in the case of fish and other animals, breeders may select for traits such as size, color, or other characteristics that are desirable in the pet or aquaculture industry.

There are also some potential drawbacks to bulk breeding. One concern is the potential for inbreeding, which can lead to a reduction in genetic diversity and an increased risk of genetic defects and health problems in the offspring. Another concern is the potential for overcrowding and poor living conditions for the animals, which can lead to stress and a reduction in the overall health and well-being of the animals.

In conclusion, bulk breeding is a method of animal breeding that has the potential to produce large numbers of offspring in a short period of time. While it can be useful in certain situations, it is important to carefully consider the potential risks and drawbacks, and to implement measures to ensure the health and well-being of the animals involved.

Pure Line Selection and Mass Selection

bulk breeding method

Bulk breeding method leads to significant evolutionary changes in the gene frequencies in a population. The material is subjected to biotic and abiotic stresses during bulking period to eliminate undesirable genotypes. This method leads to improvement in adaptation of genotypes due to bulk period. Achievements of Pedigree Method : Pedigree method has been extensively used for developing improved varieties in several self- pollinated crops like wheat, rice, pulses, barley, cotton and various vegetable crops. Harlan and colleagues provided additional theoretical foundation for this method through their work in barley breeding in 1940s. Handling of Material: The material is handled by bulk method from F 2 to F 5 and by individual plant selection as in pedigree method from F 6 onwards.

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Bulk Breeding Method: Merits & Demerits

bulk breeding method

If the multiplication rate is not too variable, about 36, 50, 60 and… Expand Genetic progress was estimated from the differences between the linear regression coefficients of the hybrids bi and the mean of the b coefficient of their respective parents bj , showing that natural selection acted in all the segregating populations and contributed to an average increase in grain yield. Method of Plant Breeding in Self Pollinated Plants — Bulk Population Method Bulk population method of breeding in self —pollinated crop is also known as mass method or population method of breeding. The backcross is useful in genetics studies for isolating separating out certain characteristics in a related group of animals or plants. Time Taken: Development of new crop cultivar by this method generally takes 14-15 years. If the trait of interest is produced by a dominant gene, this process involves four rounds of backcrossing within seven seasons.

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GPB 301: Comparison of pedigree and Bulk method

bulk breeding method

Thus pedigree selec­tion is based on genotypic value rather than phenotype value. It refers to a species is grown in bulk plot from F1 to F5 with or without selection, a part of the bulk seed is used to grow the next generation and individual plant selection is practised in F6 or later generation. What are the breeding methods? Chickpea: T1, T2, T3, T5, Radhey, etc. Application: This method is used for the genetic improvement of self-pollinated crop plants. For example, screening for disease resistance should be carried out in the disease prone area.

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Bulk population breeding ~ Breeding & Plant Genetics

bulk breeding method

Moreover, it is more commonly used for the improvement of polygenic traits than oligogenic characters. Comparison Mass Selection: A. Cotton: LH 900, LH 1556, F 846, F 1054, F 1378, HS 6, H 1098, RST 9, Vikas, Khandwa 3, Sharda, Abhadita, Sahana, MCU 9, MCU 11, LRA 5166, Anjali, Surabhi, Suvin etc. What is difference between bulk breeding and pedigree breeding method? The selected plants should be of similar phenotype as the seeds are mixed together. At maturity the crop is harvested in mass, and the seeds are used to… Why bulk method is done? Merits of Bulk Population Method: 1 This method simple, convenient and inexpensive.

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A theoretical study of the bulk breeding method

bulk breeding method

The lines are evaluated for important agronomic characteristics. The variety is inferior to the best pure line because most of the lines included within it will be inferior the best pure line. Why backcross is done? Bulk population breeding is a strategy of crop improvement in which natural selection effect is solicited more directly in the early generations of the procedure by delaying stringent artificial selection until later generations. It is difficult to assess the variability in the population and genotypic frequencies in this method, because they change in each generation of bulking. The best surviving genotypes sometimes may not be agronomically good.

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Method of Plant Breeding in Self Pollinated Plants

bulk breeding method

For this reason this method is not preferred by the plant breeders. It is most suitable for breeding species that are normally closely spaced in production. The bulk period is terminated as soon as favourable conditions for selection occur. Pea: Pant Matar 2, Jawahar Matar 1, Jawakar Matar 4 etc. Pure line variety is expected to have a narrower adaptation and lower stability in performance as there is less genetic variation. In this method natural selection operates which results in elimination of undesirable genotypes from the bulk population and increases the frequency of desirable plants.

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Pedigree Method of Plant Breeding

bulk breeding method

Just like the pedigree method, the bulk method also applies pure line theory to segregating populations to develop pure line cultivars. What are the advantages of pedigree? The natural or artificial process that results in the formation of hybrid is known as hybridization. Pigeonpea: T21, Prabhat Greengram: T2, T44, T51. Varieties developed by bulk method are more stable against environmental changes than those evolved by pedigree breeding method, because the period of bulking improves the adaptation of population. This method has been used only in few crops due to time lag.


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What is the bulk method?

bulk breeding method

Thus release of new variety by this method takes 14-15 years. The long-term bulking requires 20-30 generations and short-term bulking requires 6-10 generations. Hence artificial selection should be practised during bulk period to avoid drastic changes in genes and genotypes through natural selection. Hybridization is an important method of combining characters of different plants. Article shared by : In this article we will discuss about:- 1. As a large number of plants are selected, extensive yield trials are not necessary; less demanding process. The variety is relatively more difficult to identify in seed certification programme.

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bulk breeding method

The number of plants to be grown and selected in each generation is presented in Table 18. Thus, proportion of the best fit genotypes will increase and of poorly adapted genotypes decrease. Selection: In this method both natural as well as human selection operates. The selected material becomes so large that handling of the same becomes very difficult. What is mass pedigree method? In F 3 and F 4 generations, selection is practised within and between families. There is no need to maintain pedigree records in this method.

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