HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Leymaster, K. A. Articles by Swiger, L. A. Search for Related Content PubMed Articles by Leymaster, K. A. Articles by Swiger, L. A.

Selection for Increased Leanness of Yorkshine Swine. III. Inbreeding Effects on Secondary Traits^1,2,

Ohio Agricultural Research and Development Center, Wooster 44691

Abstract

Inbreeding effects were estimated from records of Yorkshire pigs produced in a study designed to evaluate alternative techniques of selection for increased leanness. Litter and dam inbreeding effects on 16 litter preweaning traits and inbreeding effects of individual and dam on six individual postweaning traits were investigated. The preweaning and postweaning data sets included 549 and 2,327 observations, respectively. Although litter and particularly dam inbreeding effects were generally detrimental to preweaning performance and were in general agreement with literature estimates, these effects were not statistically significant. This situation was attributed primarily to the limited range of calculated inbreeding coefficients within year-parity-line subclasses. In-breeding-of-dam effects were generally less severe for litters out of second parity dams than for litters out of first parity dams. An alternative model was presented for evaluating individual and dam inbreeding effects on individual postweaning performance. Pooled estimates of individual inbreeding effects had a depressing effect on each postweaning trait. Partial regression coefficients, per 1% change in individual inbreeding, were –.27 ± .14 kg, –.0020 ± .0015 kg, –.0027 ± .0014 kg, –.0021 ± .0012 kg, –.032 ± .017% and –.11 ± .06 kg for 160-day weight, first period daily gain, second period daily gain, total daily gain, percentage lean cuts and weight of lean cuts, respectively. Pooled estimates of inbreeding-of-dam effects were nonsignificant for each postweaning trait.

¹ Published with approval of the Director as Paper No. 86-80, Journal Ser., the Ohio Agricultural Research and Development Center.

² The authors acknowledge the useful advice of Walter R. Harvey, The Ohio State Univ., Columbus.

³ Present address: Roman L. Hruska US Meat Animal Research Center, AR, SEA, Clay Center, NE 68933.

⁴ Present address: Virginia Polytechnic Inst, and State Univ., Blacksburg.