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Journal of Animal Science, Vol 73, Issue 3 738-749, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Growth and body composition of Meishan and Yorkshire barrows and gilts

B. R. White, Y. H. Lan, F. K. McKeith, J. Novakofski, M. B. Wheeler and D. G. McLaren
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.

Five barrows and five gilts of each of two breeds (Meishan [Ms] and Yorkshire [Y]) were slaughtered at birth and at 41, 71, 123, and 171 d of age and five gilts of each breed were slaughtered at 260 d of age. Major organ and visceral weights were obtained immediately postmortem (PM), whereas carcass characteristics, carcass composition, femur measurements, and two individual muscle weights were obtained 24 h PM. Linear and quadratic regression coefficients on age differed between the two breeds, in favor of Y barrows and gilts, for live weight, carcass weight, longissimus muscle area (LMA), liver, heart, spleen, and kidney weights, and femur cross-sectional, medullary, and cortical areas (P < .001), leaf fat weight, and percentage of body fat and protein. In contrast to somatic tissue, Ms gilts had uteri and ovaries that grew faster than those of Y gilts from birth to 260 d of age (P < .05), although the uterus and ovary weights were similar for both breeds by 260 d of age (P < .05). Regression coefficients differed (P < .05) between the two sexes for live, carcass, liver, lung and trachea, stomach and esophagus and leaf fat weights, dressing percentage, percentage of body protein, 10th rib backfat (TRBF) thickness (P < .001), and small intestine, kidney (P < .01), heart, and spleen weights (P < .05). Breed differences in regression coefficients differed between the two sexes for percentage of body protein and leaf fat weights (P < .05). Yorkshire pigs were larger, later-maturing pigs that grew faster from birth to 171 d of age. Yorkshire pigs slaughtered at 171 d of age had heavier total wholesale cut (WC), trimmed cut (TC), and boneless cut (BC) weights than did Ms pigs of the same age (P < .001).


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