Effects of Feeding Rice Protein Concentrate on Growth Performance and Ileal Digestibility in Early-weaned Pigs

Abstract

These experiments were conducted to evaluate the feeding value of rice protein concentrate (RPC) in weaning pigs. In expt. I, a 5-week feeding trial was conducted with 126 pigs (L×Y×D; 21 d-old; 5.32±0.34 kg). Treatments were spray-dried plasma protein (SDPP; control), soy protein concentrate (SPC) and RPC (phase 1), and dried porcine soluble (DPS; control), SPC and RPC (phase 2). An ileal digestibility trial was also conducted to compare digestibility of amino acids in the tested protein sources. In expt. II, 160 weaning pigs (L×Y×D; 21 d-old; 5.65±0.35 kg) were used in a 5-week feeding trial to determine the optimal inclusion level of RPC in the diet. Treatments were control (9% SPC), and three levels of RPC instead of SPC in the diets (3, 6 and 9%). During phase 1, pigs fed SDPP showed better (p<0.05) ADG and FCR compared with those fed SPC or RPC, while there was no difference in ADFI among treatments. During phase 2, however, pigs fed DPS showed lower (p<0.05) ADG than those fed SPC or RPC. During the total period, there were no significant differences in ADG, ADFI and FCR among treatments. The apparent ileal digestibilities of his, lys, phe, thr and met were not different among the tested protein sources. The apparent ileal digestibilities of arg, ile, leu and val were lower (p<0.05) in RPC than SDPP. The true ileal digestibilities of arg and leu were lower (p<0.05) in RPC than SDPP and SPC. However, that of met was higher (p<0.05) in RPC than SDPP. In expt. II, there were no significant differences in ADG and FCR when SPC was substituted with RPC up to 9% during the total period. In conclusion, based on our experimental results, RPC would replace SPC in the complex prestarter diet, which is somewhat cheaper than SPC.

Determination of standardized ileal crude protein and amino acid digestibilities in protein supplements for piglets

“…The SID in SBM hp , reported herein, are in good agreement with those reported by Yang et al (2007), whereas Walker et al (1986) reported up to 17 percentage units greater SID. For soy protein concentrate, reports on SID of indispensable AA vary between 94% and 100% (Walker et al, 1986) and between 81% and 91% (Yun et al, 2005;Yang et al, 2007). Moreover, Yun et al (2005) and Yang et al (2007) determined up to 6 percentage units smaller SID of indispensable AA in soy protein concentrate compared with the present study, whereas Walker et al (1986) reported up to 17 percentage units greater SID of indispensable AA in soy protein concentrate than the present study.…”

“…For soy protein concentrate, reports on SID of indispensable AA vary between 94% and 100% (Walker et al, 1986) and between 81% and 91% (Yun et al, 2005;Yang et al, 2007). Moreover, Yun et al (2005) and Yang et al (2007) determined up to 6 percentage units smaller SID of indispensable AA in soy protein concentrate compared with the present study, whereas Walker et al (1986) reported up to 17 percentage units greater SID of indispensable AA in soy protein concentrate than the present study. There is evidence, however, that the comparison of SID between the aforementioned studies and the present study may be confounded by methodological differences in the measurement of SID between these studies.…”

“…In the present study, the determination of SID is based on analyzed values for CP and AA of the assay feed ingredients and the assay diets as well. In the studies by Yun et al (2005) and Yang et al (2007), however, values for soy protein concentrate from NRC (1998) were used to calculate the CP and AA contents of the assay diets. Total AA contents and profiles, may differ considerably between different batches of soybean meal or soy protein concentrate (Degussa, 2006), and the determination of SID based on tabulated values for the AA contents of the assay feed ingredients may be inaccurate.…”

Rice protein concentrate partially replaces dried whey in the diet for early‐weaned piglets and improves their growth performance

“…2 Recent studies have demonstrated that RPC could replace soy protein concentrate (SPC) in a complex diet for prestarter pigs (7-35 days of age). 2 Palmegiano et al 3 used a similar RPC as substitute of fish meal in diets for freshwater and marine fish. However, little is known about the effect of RPC on the growth performance of early-weaned pigs (14-21days of age).…”

“…Recently, rice protein concentrate (RPC), a much cheaper source of dietary protein, has become commercially available for use in the feed industry. 2 Feed grade RPC contains 63% crude protein and 2.423 MJ kg −1 ME (metabolism energy) for pigs.…”