A dataset quantifying ascites related traits in 10 broiler lines was analyzed to study systematic effects within and between lines. Degree of (subclinical) ascites could be described well from a combination of ascites-indicating measurements using Principal Component Analysis. Analysis between and within line revealed the same major traits predicting ascites (especially venous blood gas traits). Lines were fairly similar in their relations between ascites and body & blood traits. Line-contrasts in ascites sensitivity were predicted well by a simple 3-trait model, but not to their full extent. The dataset & study failed in explaining the superiority of crossbreds over purebreds. The major conclusion is that the between line variation is congruent with within line variation and therefore produces valid traits for within line selection. Keywords Ascites; broilers; line comparison; cold challenge; metabolic disorders
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 267–270, 1998
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