INHERITANCE OF CHROMOSOME NUMBER IN PIGS

in Reproduction

Summary.

All possible crosses were made between European wild pigs with either 36 or 37 chromosomes and domestic swine with 38. The 36×36 cross produced only pigs with 36; the 36×37 and 37×38 crosses yielded the parent numbers in about equal numbers of pigs. All pigs resulting from the 36×38 cross had 37, while crossing 37×37 gave progeny with 36, 37 or 38 in about a 1:2:1 ratio. It is surmised that the three unpaired members in the 37-chromosome animal act as a trivalent during meiosis with two telocentric chromosomes behaving as a unit. No firm evidence indicated reduced fertility in any of the animals nor were any physical changes evident which could be associated with different chromosome forms.

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     An official journal of

    Society for Reproduction and Fertility

 

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