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Inheritance of teat number in swine and the relationship to performance



Inheritance of teat number in swine and the relationship to performance



Acta Agr Scand 13(4): 323-333



A study was made to compare different methods of estimating the coefficient of heritability of nipple number in swine and also to study the relationship between nipple number and some other traits. This investigation is based on 469 litters comprising 5015 pigs born at the Pig Breeding Station of Norway during 1959-62. The heritability is estimated by 7 different methods and form 3 breed groups of animals Landrace, Large White, Landrace Large White cross. Three of the methods used are based on regression of progeny on parents; these coefficients and their standard error are given. Three other methods for estimating heritability are based on intra-class correlation between sibs; the results of these calculations are shown. The resemblance between teat numbers on the left and right side of the same animal is calculated, and a coefficient which represents the upper limit of heritability is given. The comparison of the coefficients from these methods shows that the coefficients calculated on the basis of regression of offspring on parents (methods 1, 2 and 3) and the coefficients based on the paternal half-sib correlation (method 4) gave values of about the same size. The coefficients which are based on maternal half sib correlation (method 5) are expected to include the general maternal effect, the latter being common to all litters within sows. The coefficient of heritability, calculated from the correlation between litter mates (method 6) is expected to include both the general and special maternal effects together with the variance due to dominance. Comparing the coefficients from methods 1[long dash]4 with the coefficients from methods 5-6 it is possible to state that the maternal effect has increased the 2 latter types of coefficients by approximately 0.1. Because the coefficients calculated by method 6 are not higher than those calculated by method 5 it is permissible to assume that neither the special maternal effect nor the dominance effect play a prominent role in the variation of the nipple number. The same conclusion can be drawn where the teat number of the crossbreds is exactly the same as the average teat number of the progeny of their respective parent lines. The linear regression of teat numbers of progeny on the average teat number of their respective parents indicates the same. The small differences between the coefficients calculated for resemblance between nipple number on the left and right side, and the coefficients calculated from method 6 indicate also that the epistatic effect may be of minor importance when discussing the variation in nipple number. From this comparison it is assumed that the additive gene effect is responsible for a prominent part of the genetic variation in the nipple number of swine. Finally the relationship between nipple numbers and some other characteristics is shown. A significant correlation between nipple number and number of pigs at 3 weeks is found. All other characteristics investigated show no significant correlation with nipple number.

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Accession: 014082560

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DOI: 10.1080/00015126309435658


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