By Alick Drummond Buchanan Smith, Olive Janet Robinson, D.M. Bryant

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AXELSSON (1928) is of the opinion that season has no influence upon litter size at birth or upon subsequent growth. A. In passing, mention must be made of some evidence (largely conflicting) to the effect that the interval between gestations has little influence upon subsequent litter size. It is interesting to note that DASSOGNO (I 9 I 5) found the size and weight of litter to have no effect upon the gestation period. This + SEX 43 was confirmed by JOHANSSON (1929c) who also found that the season of the year had little influence on the gestation period.

Density versus absence of hair (Lincoln and Cornwall) also shows an intermediate type of transmission. RHOAD (1934) reports that the curlyhaired condition (which he calls "woolly hair") in the native Canasstrao breed of Brazil is clearly inherited as a monogenic Mendelian dominant and in outcrosses no trace of an intermediate condition is found. During the course of an investigation on the F 1 ot Mangalita X Large White and X Middle White crosses, CONSTANTINESCU (1933) observes that the coat of these crosses is composed of only one type of fibre, whereas the pure Mangalita has two types.

The reason given for the occurrence of the half-black is that in the fertilisation of the ova of the sow there occurred an association of factors which combined the factor for black with the characteristic pattern factor of the Bavarian Landschwein. With regard to the white spotting and white saddle sometimes found in pure-bred Duroc-Jerseys, NORDBY (1934) considers that the white extremities and white saddle must be regarded as two distinct patterns. Further, the genetic expression of either of these patterns cannot be explained on the basis of a single set of factors.

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