Methods of cross breedy
Cross breeding
Mating two individuals from different breeds thus introducing into the progeny a gene combination that is different from that existing in either parent or in the breed of either parent. Cross breeding can involve two or more breeds, depending on the desired result. The sole purpose of cross breeding is to take advantage of the observed improvement in performance of the progeny above that of either parent
- hybrid vigour or heterosis.
Effect of Cross Breeding
--- Local sow with her piglets
--- Exotic sow with her piglets
--- Female piglet from local sow and Male piglet from exotic sow are taken by a farmer to his home for breeding propose
--- Breeding between these male and female pig
--- Healthy and bigger body size piglets are born from the local sow
--- All male piglets are sold and few selected crossed bread female are kept for breeding
--- Another exotic male which is not in relation with the herd introduced for breeding.
--- Breeding between them
--- Very healthy, strong, active and fast growing piglets are born
Effect of Negative Selection
--- Sow with newly borne litters about 12 piglets.
--- Stronger and healthy piglets were either sold or castrated for meat purpose
--- Smaller and weak Male and Female piglets kept for breeding purpose.
--- Breeding between the same siblings.
--- Female giving birth about 9 piglets
--- About 25 % less no of smaller and weak piglets are born as compared with first sow and some of them were borne dead
--- Among the piglets stronger and healthy either sold for cash or castrated for meat and smaller and weak are kept for breeding purpose.
Cross breeding
Mating two individuals from different breeds thus introducing into the progeny a gene combination that is different from that existing in either parent or in the breed of either parent. Cross breeding can involve two or more breeds, depending on the desired result. The sole purpose of cross breeding is to take advantage of the observed improvement in performance of the progeny above that of either parent
- hybrid vigour or heterosis.
Effect of Cross Breeding
--- Local sow with her piglets
--- Exotic sow with her piglets
--- Female piglet from local sow and Male piglet from exotic sow are taken by a farmer to his home for breeding propose
--- Breeding between these male and female pig
--- Healthy and bigger body size piglets are born from the local sow
--- All male piglets are sold and few selected crossed bread female are kept for breeding
--- Another exotic male which is not in relation with the herd introduced for breeding.
--- Breeding between them
--- Very healthy, strong, active and fast growing piglets are born
Effect of Negative Selection
--- Sow with newly borne litters about 12 piglets.
--- Stronger and healthy piglets were either sold or castrated for meat purpose
--- Smaller and weak Male and Female piglets kept for breeding purpose.
--- Breeding between the same siblings.
--- Female giving birth about 9 piglets
--- About 25 % less no of smaller and weak piglets are born as compared with first sow and some of them were borne dead
--- Among the piglets stronger and healthy either sold for cash or castrated for meat and smaller and weak are kept for breeding purpose.
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