Effect on performance and carcass characteristics of nursery to finisher pigs fed reduced crude protein, amino acid-supplemented diets

Abstract

An experiment was conducted to evaluate the effect of feeding reduced CP, amino acid (AA)-supplemented diets to pigs from weaning to slaughter weight on growth performance and carcass characteristics. Pigs were fed a 19%-16%-14% CP starter-grower-finisher high-CP sequence of diets, respectively, or a sequence of diets reduced in CP by 4 percentage units (3 percentage units in the finisher period) with or without lysine (LYS), tryptophan (TRP), and threonine (THR) supplementation. Pigs fed the low-CP diets without AA supplementation grew more slowly, were less efficient in feed conversion, and developed carcasses that contained a smaller longissimus muscle, greater, average backfat depths, and a lower percentage of muscle compared with pigs fed the high-CP sequence of diets (P < .01). The reduction in growth performance, feed efficiency, longissimus muscle area, and percentage of muscle in pigs fed the low-CP diets was alleviated by LYS, TRP, and THR supplementation (P > .10). Although pigs fed the low-CP diets supplemented with AA had reduced average and 10th rib backfat depths compared with pigs fed the unsupplemented, low-CP diets (P < .01), these fat depth measures remained greater (P < .05) than those of pigs fed the high-CP diets. Feeding reduced dietary CP, regardless of AA supplementation, resulted in reduced heart (P < .10) and liver weights (P < .01) compared with feeding the high-CP diets.(ABSTRACT TRUNCATED AT 250 WORDS)

Effects of low-protein diets supplemented with indispensable amino acids on growth performance, intestinal morphology and immunological parameters in 13 to 35 kg pigs

“…The decreasing dietary CP level decreased the relative organ weights of liver and pancreas, which is in agreement with the results by Kerr et al (1995) and Heo et al (2010). The reduction in pancreas weight of pigs fed low-CP diets may suggest a reduced amount of pancreatic protease, which would be required to digest the smaller quantity of consumed protein (Heo et al, 2010).…”

“…The reduction in pancreas weight of pigs fed low-CP diets may suggest a reduced amount of pancreatic protease, which would be required to digest the smaller quantity of consumed protein (Heo et al, 2010). Besides, the liver weight has been reported to decrease with decreasing dietary protein level, the lower liver may be due to an adaptation of liver to less AA metabolism in pigs receiving low-CP diet (Kerr et al, 1995). The small-intestinal morphology is usually used to reflect intestinal development.…”

Avaliação de níveis de glicina+serina em dietas de frangos de corte com reduzido teor de proteína bruta

“…Da mesma forma que ocorreu neste experimento, aumento dos níveis de gordura na carcaça com redução dos teores de PB da dieta têm sido observados com frequência nos trabalhos científicos (Kerr et al, 1995;Cromwell et al, 1996;Tuitoek et al, 1997;Braga, 1999;Costa et al, 2001;Bregendahl et al, 2002;Silva et al, 2003). Isso deve-se ao fato de haver economia de energia quando não se tem excesso de nitrogênio para ser eliminado.…”

Características de carcaça e peso de vísceras em suínos alimentados com rações contendo baixos teores de proteína bruta

“…Na literatura, os resultados são controversos. Enquanto alguns autores constataram efeito do teor de PB no peso de rins (KERR et al, 1995;KERR et al, 2003), outros não observaram influência do consumo de PB no peso dos rins (LE BELLEGO & NOBLET, 2002;GÓMEZ et al, 2002).…”