Mooney K W, Cromwell G L
Department of Animal Sciences, University of Kentucky, Lexington 40546, USA.
J Anim Sci. 1999 May;77(5):1188-98. doi: 10.2527/1999.7751188x.
We conducted two experiments to determine whether the efficacy of chromium picolinate (CrP) on growth performance, carcass composition, and tissue accretion rates is dependent on the lean gain potential of the pigs. In Exp. 1, 40 barrows (20 from each of two genetic backgrounds; two pigs per pen, five pens per treatment) were fed a fortified, corn-soybean meal basal diet (.95% lysine from 19 to 55 kg BW; .80% lysine from 55 to 109 kg BW) without or with 200 microg/kg of Cr from CrP. The addition of Cr had no effect on performance, carcass measurements, or accretion rates of carcass protein or lipid, regardless of the lean gain potential of the pigs. In Exp. 2, 60 group-penned pigs (three pigs per pen; five pens per treatment) were fed a fortified, corn-soybean meal basal diet without or with 200 microg/kg of Cr from CrP from 21 to 104 kg BW. Within the dietary Cr treatments, half of the pigs received daily injections of 3 mg of porcine somatotropin (pST) from 54 to 104 kg BW. The pST administration resulted in faster growth rates (P < .007), improved feed efficiency (P < .001), increased longissimus area (P < .001), and decreased 10th-rib backfat (P < .001). Administration of pST also increased the percentage and accretion rate of carcass protein (P < .001) and decreased the percentage and accretion rate of carcass lipid (P < .001). The addition of CrP to the diet had no effect on any variable measured in either the untreated or pST-treated pigs. In these studies, Cr was ineffective at altering the composition of the carcass and its effects were not dependent on the pig's potential for lean gain.
我们进行了两项试验，以确定吡啶甲酸铬（CrP）对生长性能、胴体组成和组织生长率的功效是否取决于猪的瘦肉生长潜力。在试验1中，40头公猪（来自两个遗传背景，每个背景20头；每栏2头猪，每个处理5栏）被饲喂一种强化的玉米-豆粕基础日粮（体重19至55千克时赖氨酸含量为0.95%；体重55至109千克时赖氨酸含量为0.80%），日粮中不添加或添加200微克/千克来自CrP的铬。无论猪的瘦肉生长潜力如何，添加铬对性能、胴体测量指标或胴体蛋白质或脂肪的生长率均无影响。在试验2中，60头群养的猪（每栏3头猪；每个处理5栏）从体重21至104千克期间被饲喂一种强化的玉米-豆粕基础日粮，日粮中不添加或添加200微克/千克来自CrP的铬。在日粮铬处理组中，一半的猪从体重54至104千克期间每天注射3毫克猪生长激素（pST）。施用pST导致生长速度加快（P < 0.007）、饲料效率提高（P < 0.001）、背最长肌面积增加（P < 0.001）以及第10肋处背膘厚度降低（P < 0.001）。施用pST还提高了胴体蛋白质的百分比和生长率（P < 0.001），并降低了胴体脂肪的百分比和生长率（P < 0.001）。日粮中添加CrP对未处理或pST处理的猪所测量的任何变量均无影响。在这些研究中，铬在改变胴体组成方面无效，其作用不取决于猪的瘦肉生长潜力。
