In breeding
Mating between individuals of the same breed but which are more closely relate than the average of the breed. This could be between as close individuals as full sibs or sire – daughter, mother - son. Pure breeding is a special kind of in-breeding.
The effect of inbreeding is the concentration of common genes in the offspring. This high frequency of homozygous gene pairs applies to both desirable and undesirable traits.
Many undesirable traits e.g. hernia and cryptorchidism involve recessive genes thus inbreeding perpetuates their expression phenotypically. In breeding causes 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.
Effect of In-Breeding
a. Sow with newly borne litters about 12 piglets.
b. Male and Female piglets taken by another farmers to his home.
c. Breeding between the same siblings.
d. Female giving birth about 9 piglets
e.
About 25 % less no of smaller and weak piglets are born as compared with first sow and some of them were borne dead
f. Male and Female piglet taken by another farmers to his home
g. Breeding between the same siblings about six piglets.
h. About 50 % less no of vey smaller and weak piglets born as compared with the first sow, some of them were borne dead
Mating between individuals of the same breed but which are more closely relate than the average of the breed. This could be between as close individuals as full sibs or sire – daughter, mother - son. Pure breeding is a special kind of in-breeding.
The effect of inbreeding is the concentration of common genes in the offspring. This high frequency of homozygous gene pairs applies to both desirable and undesirable traits.
Many undesirable traits e.g. hernia and cryptorchidism involve recessive genes thus inbreeding perpetuates their expression phenotypically. In breeding causes 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.
Effect of In-Breeding
a. Sow with newly borne litters about 12 piglets.
b. Male and Female piglets taken by another farmers to his home.
c. Breeding between the same siblings.
d. Female giving birth about 9 piglets
e.
About 25 % less no of smaller and weak piglets are born as compared with first sow and some of them were borne dead
f. Male and Female piglet taken by another farmers to his home
g. Breeding between the same siblings about six piglets.
h. About 50 % less no of vey smaller and weak piglets born as compared with the first sow, some of them were borne dead
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