The effects of feeding varying amounts of gossypol from whole cottonseed and cottonseed meal in lactating dairy cows
The effects of feeding varying amounts of gossypol from whole cottonseed and cottonseed meal in lactating dairy cows
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DOI：
10.3168/jds.s0022-0302(01)74670-x
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发表时间：
2001-10-01
影响因子：
3.5
通讯作者：
Calhoun, MC
中科院分区：
文献类型：
--
作者：
Mena, H;Santos, JEP;Calhoun, MC
对30头泌乳期荷斯坦奶牛饲喂不同剂量的全棉籽棉酚和棉籽粕棉酚的效果进行了研究。经过14 d的预处理后，奶牛被分为5组，每组42 d：对照组（日粮A），全棉籽总棉酚1040 mg/kg和游离棉酚989 mg/kg组（日粮B），棉籽粕总棉酚900 mg/kg和游离棉酚64 mg/kg组（日粮C），全棉籽总棉酚1040 mg/kg和游离棉酚989 mg/kg组（日粮B），棉籽粕总棉酚900 mg/kg和游离棉酚64 mg/kg组（日粮C）。全棉籽和棉籽粕中总棉酚含量为960 mg/kg，游离棉酚含量为531 mg/kg（日粮D），全棉籽和棉籽粕中总棉酚含量为1922 mg/kg，游离棉酚含量为1050 mg/kg（日粮E）。血浆棉酚及其异构体浓度与游离棉酚摄入量成正比。血浆棉酚浓度在处理35天后达到平台，并且在接受饮食E的奶牛中最高。在42天的治疗，红细胞脆性较高的奶牛接受饮食E，但它没有在其他治疗之间的差异。所有组的干物质摄入量相似。奶牛接受饮食E产生更多的牛奶和3.5%的脂肪校正牛奶，但牛奶蛋白质含量下降。饲喂含有1900 mg/kg总棉酚和1050 mg/kg游离棉酚的饲料42 d，导致血浆棉酚浓度和红细胞脆性增加，但对泌乳性能无不利影响。
Effects of feeding varying amounts of total gossypol from whole cottonseed and cottonseed meal were evaluated in 30 lactating Holstein cows. After a 14-d pretreatment period, cows were assigned for 42 d to one of five treatments: control (diet A); 1040 mg/kg of total gossypol, and 989 mg/kg of free gossypol from whole cottonseed (diet B); 900 mg/kg of total gossypol and 64 mg/kg of free gossypol from cottonseed meal (diet C); 960 mg/kg of total gossypol and 531 mg/kg of free gossypol with equal amounts of total gossypol from whole cottonseed and cottonseed meal (diet D); or 1922 mg/kg of total gossypol and 1050 mg/kg of free gossypol with equal amounts of total gossypol from whole cottonseed and cottonseed meal (diet E). Concentrations of plasma gossypol and its isomers were directly proportional to free gossypol intake. Plasma gossypol concentrations plateaued after 35 d on treatment, and they were highest in cows receiving diet E. At 42 d on treatment, erythrocyte fragility was higher in the cows receiving the diet E, but it did not differ among other treatments. Dry matter intakes were similar for all groups. Cows receiving diet E produced more milk and 3.5% fat-corrected milk, but milk protein content decreased. Feeding diets containing 1900 mg/kg of total gossypol and 1050 mg/kg of free gossypol for 42 d resulted in increased plasma gossypol concentrations and erythrocyte fragility, but no detrimental impact on lactation performance were observed.