Thus, crossbreeding with 100% imported seed of foreign breeds resulted in up to 99.4% foreign blood in seventh generation cows. For our country, 50.0%-62.5% of foreign breed blood cows are suitable. Note that cows with up to 75% foreign blood can be reared with extreme care.
62.5% blood cows of foreign breeds can be stocked in the following manner for production. The performance of such cows is good.
50% Foreign Breed Blood Cow × 75% Foreign Breed Bull Semen; Cows will have 62.5% foreign blood and 37.5% indigenous blood. Crossbreeding with indigenous cows only with improved seeds can be done instead of domestically improved cows, but milk production may not be as expected and dystocia may occur during parturition.
In the rural areas of this country, 50% domestic and 50% foreign breeds of cows with cow quality (F1) are more suitable for farmers. For the production of such breeds, 50% domestic and 50% foreign colic cows (F1) should be crossed with 50% domestic and 50% foreign colic (F1) bulls and this method is called Inter-se-mating.
For this reason, provision should be made to keep 50% domestic and 50% foreign breeds of bulls in the artificial breeding centers and the seeds of such bulls are frozen and artificial breeding is done in a healthy way for the cows of the farmers of this country.