Lindemann M D, Wood C M, Harper A F, Kornegay E T, Anderson R A
Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA.
J Anim Sci. 1995 Feb;73(2):457-65. doi: 10.2527/1995.732457x.
Growth trials were conducted to determine the effects of Cr as chromium picolinate at various protein levels on performance of growing pigs. The effects of continued supplementation on sow fecundity and body weight changes through two parities also were examined. In Trial 1, 48 crossbred pigs (40.9 kg initial weight) were assigned to one of three diets (0, 250, or 500 ppb of added Cr). The only observed difference was an overall trend for an improvement in gain:feed when Cr was added to the diet (P < .10). In Trial 2, 105 crossbred pigs (14.5 kg initial weight) were assigned to one of seven treatments involving a combination of two factors: 1) lysine level at 100 or 120% of NRC (1988) requirement estimate and 2) added Cr level (0, 100, 200, 500, or 1,000 ppb). A Cr x lysine interaction (P < .02) for gain:feed existed that demonstrated that the addition of 200 ppb of Cr resulted in improved gain:feed at the 100% of requirement lysine level but not at the 120% of requirement lysine level. The addition of 200 ppb Cr also reduced backfat (P < .04) and increased longissimus muscle area (P < .04) regardless of lysine level in the diet.(ABSTRACT TRUNCATED AT 250 WORDS)
进行生长试验以确定不同蛋白质水平下，吡啶甲酸铬形式的铬对生长猪生产性能的影响。还研究了持续添加铬对母猪繁殖力和两胎次体重变化的影响。在试验1中，48头杂交猪（初始体重40.9千克）被分配到三种日粮之一（添加0、250或500 ppb铬）。唯一观察到的差异是日粮添加铬时，生长育肥比有整体改善趋势（P < 0.10）。在试验2中，105头杂交猪（初始体重14.5千克）被分配到七个处理组之一，这七个处理组涉及两个因素的组合：1）赖氨酸水平为NRC（1988）需求估计值的100%或120%，2）添加铬水平（0、100、200、500或1000 ppb）。生长育肥比存在铬×赖氨酸互作（P < 0.02），表明添加200 ppb铬在赖氨酸水平为需求值的100%时可改善生长育肥比，但在赖氨酸水平为需求值的120%时则不然。无论日粮中赖氨酸水平如何，添加200 ppb铬还可减少背膘厚度（P < 0.04）并增加背最长肌面积（P < 0.04）。（摘要截短于250字）
