■本研究旨在研究减少日粮粗蛋白(CP)并补充必需氨基酸(AA)对猪在不同生长阶段的生长性能的影响。
■总共126只(63只手推车和63只后备母猪),90(45只手推车和后备母猪),和72头(36头手推车和36头后备母猪)猪,平均体重为9.8±1.62,30.6±2.31和58.3±2.95公斤,成长,和最后阶段,分别,在随机完全区组设计中被分配到三个饮食治疗中,六个重复。猪可以随意获得水,并喂食三种实验饮食,每个补充了所有必不可少的AA,并从18%的上限降低了2%的CP,16%,16%是为托儿所建立的,成长,和最后阶段,分别。
■在托儿所阶段,从0到2周,降低日粮CP浓度会降低平均日采食量(ADFI;线性,p=0.04)。从2到4周,饮食CP减少降低平均日增重(ADG;线性,p<0.01;二次,p=0.02),ADFI(线性,p=0.04),和增益进料比(G:F;线性,p=0.01)。从0到4周,日粮CP浓度降低降低ADG(线性p<0.01),和G:F(线性,p=0.01)。在成长阶段,饮食中CP的减少并不影响生长性能.在完成阶段,从3到6周,饮食中CP浓度的降低降低了ADFI(二次,p<0.01)和0至6周(二次,p=0.01)。
■添加必需的AA降低饮食CP可能会降低保育猪的生长性能,但不会降低生长猪和育肥猪的生长性能。
UNASSIGNED: This study aimed to investigate the impact of reducing dietary crude protein (CP) coupled with supplementation of indispensable amino acids (AA) on growth performance of pigs at different growth stages.
UNASSIGNED: A total of 126 (63 barrows and 63 gilts), 90 (45 barrows and gilts), and 72 (36 barrows and 36 gilts) pigs with average weights of 9.8 ± 1.62, 30.6 ± 2.31, and 58.3 ± 2.95 kg in the nursery, growing, and finishing stages, respectively, were assigned to three dietary treatments with six replicates in a randomized complete block design. The pigs had ad libitum access to water and fed three experimental diets, each supplemented with all indispensable AA and subjected to a 2% reduction in CP from the upper limits of 18%, 16%, and 16% established for the nursery, growing, and finishing stages, respectively.
UNASSIGNED: In the nursery stage, from 0 to 2 weeks, reducing dietary CP concentrations decreased average daily feed intake (ADFI; linear, p = 0.04). From 2 to 4 weeks, dietary CP reduction decreased average daily gain (ADG; linear, p < 0.01; quadratic, p = 0.02), ADFI (linear, p = 0.04), and gain-to-feed ratio (G:F; linear, p = 0.01). From 0 to 4 weeks, reduction in dietary CP concentrations decreased ADG (linear p < 0.01), and G:F (linear, p = 0.01). In the growing stage, the dietary CP reduction did not affect growth performance. During the finishing stage, decrease in dietary CP concentrations decreased ADFI from 3 to 6 weeks (quadratic, p < 0.01) and 0 to 6 weeks (quadratic, p = 0.01).
UNASSIGNED: Dietary CP reduction with indispensable AA supplementation potentially decreases the growth performance of nursery pigs but may not decrease the growth performance of growing and finishing pigs.