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<blockquote data-quote="MikeC" data-source="post: 350865" data-attributes="member: 1604"><p>Extreme inbreeding may be avoided in any linebreeding program by not mating fathers to daughters or siblings to each other (or other similar matings that involve close relatives). However, the degree of inbreeding is related not just to the immediate relationship between the two mated individuals, but also to the degree to which these individuals were already inbred. For instance, if a particular bull is widely used in a linebreeding program, then many of the cattle in that program will already share the genes of that bull, and the chances of getting two deleterious alleles from that bull in the same offspring are greatly increased. The chances may not be as great as would occur between the matings of siblings, but they are much higher than would occur in a randomly mating population. <strong>Even small increases in inbreeding result in some inbreeding depression.</strong> <strong>For instance, just a 1% increase in inbreeding (that is, a 1% increase in the probability that a calf receives the same gene from both parents) results in a measurable decrease in milk quantity and quality, shortening of productive life, and increase in calving interval in studied breeds of cattle.</strong></p></blockquote><p></p>
[QUOTE="MikeC, post: 350865, member: 1604"] Extreme inbreeding may be avoided in any linebreeding program by not mating fathers to daughters or siblings to each other (or other similar matings that involve close relatives). However, the degree of inbreeding is related not just to the immediate relationship between the two mated individuals, but also to the degree to which these individuals were already inbred. For instance, if a particular bull is widely used in a linebreeding program, then many of the cattle in that program will already share the genes of that bull, and the chances of getting two deleterious alleles from that bull in the same offspring are greatly increased. The chances may not be as great as would occur between the matings of siblings, but they are much higher than would occur in a randomly mating population. [b]Even small increases in inbreeding result in some inbreeding depression.[/b] [b]For instance, just a 1% increase in inbreeding (that is, a 1% increase in the probability that a calf receives the same gene from both parents) results in a measurable decrease in milk quantity and quality, shortening of productive life, and increase in calving interval in studied breeds of cattle.[/b] [/QUOTE]
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