performance

Expression of cationic amino acid transporters, carcass traits, and performance of growing pigs fed low-protein amino acid-supplemented versus high protein diets

A. Morales, Grageola, F., García, H., Araiza, A., Zijlstra, R. T., and Cervantes, M., Expression of cationic amino acid transporters, carcass traits, and performance of growing pigs fed low-protein amino acid-supplemented versus high protein diets, vol. 12, pp. 4712-4722, 2013.

Free amino acids (AA) appear to be absorbed faster than protein-bound AA (PB-AA). We conducted an experiment to assess the effect of feeding pigs with a partially free (F-AA) or totally PB-AA diet on expression of selected genes and performance of pigs. The expression of cationic AA transporters b0,+ and CAT-1 in intestinal mucosa, liver, and longissimus (LM) and semitendinosus (SM) muscles, as well as that of myosin in LM and SM, was analyzed. Twelve pigs (31.7 ± 2.7 kg) were used.

Non-additive genetic effects on weights and performance of a Brazilian Bos taurus x Bos indicus beef composite

G. B. Mourão, Ferraz, J. B. S., Eler, J. P., Bueno, R. S., Balieiro, J. C. C., Mattos, E. C., and Figueiredo, L. G. G., Non-additive genetic effects on weights and performance of a Brazilian Bos taurus x Bos indicus beef composite, vol. 7, pp. 1156-1163, 2008.

The aim of the present study was to evaluate the heterosis effects on weaning weight at 205 days (WW, n = 146,464), yearling weight at 390 days (YW, n = 69,315) and weight gain from weaning to yearling (WG, n = 59,307) in composite beef cattle. The fixed models were: RM, which included contemporary groups, class of age of dam, outcrossing percentages for direct and maternal effects, and additive direct and maternal (AM) breed effects; R, RM model, minus AM breed effects, and H, RM model, minus additive breed effects. The estimates for W205 were in general positive (P 0.01).

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