Maximum number of total born piglets in a parity and individual ranges in litter size expressed as specific characteristics of ... View Full Text


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Article Info

DATE

2018-12

AUTHORS

Gertraude Freyer

ABSTRACT

The objective of this study was to underline that litter size as a key trait of sows needs new parameters to be evaluated and to target an individual optimum. Large individual variation in litter size affects both production and piglet’s survival and health negatively. Therefore, two new traits were suggested and analyzed. Two data sets on 5509 purebred German Landrace sows and 3926 Large White and crossing sows including at least two parental generations and at least five parities were subjected to variance components analysis. The new traits for evaluating litter size were derived from the individual numbers of total born piglets (TBP) per parity: In most cases, sows reach their maximum litter size in their fourth parity. Therefore, data from at least five parities were included. The first observable maximum and minimum of TBP, and the individual variation expressed by the range were targeted. Maximum of TBP being an observable trait in pig breeding and management yielded clearly higher heritability estimates (h2~ 0.3) than those estimates predominantly reported so far. Maximum TBP gets closer to the genetic capacity for litter size than other litter traits. Minimum of TBP is positively correlated with the range of TBP (rp = 0.48, rg > 0.6). The correlation between maximum of TBP and its individually reached frequency was negative in both data sets (rp = − 0.28 and − 0.22, respectively). Estimated heritability coefficients for the range of TBP comprised a span of h2 = 0.06 to 0.10. An optimum both for maximum and range of total born piglets in selecting sows is a way contributing to homogenous litters in order to improving the animal-related conditions both for piglets’ welfare and economic management in pig. More... »

PAGES

13

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s40781-018-0172-x

DOI

http://dx.doi.org/10.1186/s40781-018-0172-x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1103934892


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