Monday 25 July 2011

Pig Breeding Models

Pure-breeding: mating purebred individuals of the same breed. The progeny has the same genetic makeup. The major objective of pure-breeding is to identify and propagate superior genes for use in commercial production primarily in crossbreeding programs as well as to propagate and identify superior females for maintaining valuable genetic material. Furthermore crossbreeding will not be worthwhile unless superior pure bred individuals are used.
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. This is known as hybrid vigour or heterosis.
Out breeding: mating individuals of the same breed but which are less closely related than the average of the breed. There should not be a common ancestor for at least four generation back in the pedigree of the boar and the females with which he is mated. It is a useful mating system in purebred individuals.
In breeding: mating individuals of the same breed but which are more closely related than the average of the breed. This could be between such close individuals as those from the same litter or a boar and his daughter. Inbreeding is rarely practiced because it can cause problems such as a decrease in litter size and increases mortality. Inbred sows are inferior in milking and mothering ability. It delays sexual maturity in gilts and boars. Inbred boars have less sexual libido. Inbred gilts have fewer eggs during oestrus and farrow smaller litters than those out bred.

1 comment:

  1. I have found great information from this site. Keep up the good work. Pig farming in Kenya is definitely a profitable venture.

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