Wondra K J, Hancock J D, Kennedy G A, Behnke K C, Wondra K R
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-0201, USA.
J Anim Sci. 1995 Feb;73(2):427-32. doi: 10.2527/1995.732427x.
Thirty-eight second-parity sows were used to determine the effects of particle size of corn in lactation diets on nutrient metabolism. The sows were fed a corn-soybean meal-based diet with the corn ground to targeted average particle diameters of 1,200, 900, 600, and 400 microns. Loss of BW and backfat and litter performance were not influenced by treatment (P > .10). However, as particle size was reduced from 1,200 to 400 microns, apparent digestibilities of DM (linear effect, P < .001) and N (quadratic effect, P < .007) were increased by 7 and 10%, respectively, and fecal excretions of DM and N were decreased (linear effects, P < .001) by 35 and 42%, respectively. Urinary N excretion was not affected by particle size (P > .20), but there was a trend (P < .08) for the greatest apparent biological values at the intermediate particle sizes (i.e., 900 and 600 microns). Thus, with increased apparent digestibility and no increases in urinary loss, N retention was increased by 22% as particle size of corn was reduced from 1,200 to 600 microns (quadratic effect, P < .04). Digestible energy and ME concentrations of the diets were increased as particle size of corn was reduced from 1,200 to 400 microns (linear effects, P < .001), with a ME value of 3,745 kcal/kg for the diet with corn at 400 microns compared with 3,399 kcal/kg for the diet with corn at 1,200 microns.(ABSTRACT TRUNCATED AT 250 WORDS)
选用38头经产母猪来确定泌乳期日粮中玉米粒度对养分代谢的影响。给母猪饲喂以玉米 - 豆粕为基础的日粮，其中玉米研磨至目标平均粒径分别为1200、900、600和400微米。处理对母猪体重、背膘损失及窝性能无影响（P > 0.10）。然而，随着粒度从1200微米降至400微米，干物质（线性效应，P < 0.001）和氮（二次效应，P < 0.007）的表观消化率分别提高了7%和10%，干物质和氮的粪便排泄量分别降低（线性效应，P < 0.001）了35%和42%。尿氮排泄不受粒度影响（P > 0.20），但在中等粒度（即900和600微米）时表观生物学价值有升高趋势（P < 0.08）。因此，随着表观消化率提高且尿损失无增加，当玉米粒度从1200微米降至600微米时，氮保留量增加了22%（二次效应，P < 0.04）。随着玉米粒度从1200微米降至400微米，日粮的消化能和代谢能浓度升高（线性效应，P < 0.001），400微米玉米日粮的代谢能值为3745千卡/千克，而1200微米玉米日粮的代谢能值为3399千卡/千克。（摘要截短为250字）
