PREWEANING VARIABLES INFLUENCE ON MARKET TRAITS IN RABBITS

Influence of several preweaning variables on market trait determinatio n was investigated using 338 fryer rabbits from 52 litters. Variables measured at 1, 8, and 15 d included litter size, individual kit body w eight (BW), within-litter rank. score for BW, and litter uniformity (c oefficient of variation for BW among littermates; CV). Daily milk. con sumption in wk 1, 2, and 3 was used to determine average weekly domina nce rank score and total weekly milk consumption. Market traits were i ndividual average daily gain (ADG) and litter feed intake (FI) from 28 to 70 d, and 70-d BW (BW70); litter uniformity (CV70), Litter size (L S70), and within-litter rank score for BW (RANK70). Market traits were analyzed separately by week involving preweaning variables and season of weaning as covariates. The week models provided the most accurate predictions of ADG, BW70, FI, and LS70 (R(2) = .542, .712, .906, and . 970, respectively). Prediction of CV70 and RANK70 was poor (R(2) = .20 2 to .369). Season influenced ADG, BW70, and FI (partial R(2) values o f .285 to .435). Path analysis indicated that milk consumption and BW were more important in BW70 determination (28.4, 26.4, and 36.9% of to tal variation in wk 1, 2, and 3, respectively) than litter size (parti al R(2) less than or equal to 2.0%). In wk 1, litter size plus dominan ce rank score primarily determined LS70 (direct and indirect contribut ions of 62.3 and 21.5%). Because of major seasonal influences, managem ent should take measures to optimize feed intake and to improve doe mi lk yield and fryer gain performance.