Breeding programme to increase production efficiency of small ruminants in developing countries
The breeding programme proposed is very simple and easy to apply. It consists of three essential steps and, if possible, a fourth step to accelerate progress further. 1. Mate all prospective replacement females to give birth at about one year of age. 2. Retain only females for further breeding that wean offspring from this first mating. In subsequent years discard any that fail when they fail. 3. Mate only twin males born from mothers at an age of about one year, or if no twins are born select the heaviest singles from yearling mothers. Mate all males so that the sire is about one year of age when offspring are born. 4. Add research and development in nucleus flocks on experimental or government farms to follow to above steps more exactly and fully, to add selection for success of artificial insemination with frozen semen, and to use embryo transfer to increase selection differentials and to decrease generation interval on the female side. Success is assured by the high selection differential obtained by using the early weaning performance as an indicator of lifetime performance and of genetic merit for high production, and by turning over male generations every year. Experience has shown that the first step will give 1 percent each year plus about 5 percent immediate, one-time phenotypic gain
| Main Authors: | , , , , |
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| Format: | biblioteca |
| Published: |
Roma (Italia) FAO
1986
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| Subjects: | OVINOS, CAPRINOS, PROGRAMAS DE MEJORAMIENTO, INVESTIGACION Y DESARROLLO, EXPERIMENTACION, INSEMINACION ARTIFICIAL, TRANSFERENCIA DE EMBRIONES, SELECCION, |
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