动物营养学报2017，Vol.29Issue(8)：2777-2784,8.DOI:10.3969/j.issn.1006-267x.2017.08.021
半胱胺盐酸盐对泌乳中期热应激 奶牛生产性能的影响
Effects of Cysteamine Hydrochloride on Performance of Heat-Stressed Mid-Lactating Dairy Cows
摘要
Abstract
This study aimed at researching the effects of cysteamine hydrochloride ( CSH) on performance of mid-lactating cows suffered from heat stress in free stall barn. Forty-eight healthy mid-lactation Holstein dairy cows with body weight of (562.25±37.85) kg, milk yield of (26.58±1.58) kg, (1.23±0.42) parities and (123.64±10.67) d in milk were randomly divided into 4 groups (12 cows per group). Cows in 4 groups were fed diets containing 0 ( control) , 3, 15 and 30 g/kg CSH in diet, respectively. The pre-trial lasted for 12 d, and the trial lasted for 30 d. The results showed as follows: with the increase of CSH supplemental level, re-spiratory rate and rectal temperature was linearly significantly reduced ( P<0.05); dry matter intake, 4% fat-corrected milk yield, energy-corrected milk yield, milk fat percentage and milk protein percentage were qua-dratically significantly change of firstly increased and then decreased (P<0.05), and 3 g/kg group showed better effects; at the end of trial period, compared with control group, serum thyroxin concentration in 3 and 15 g/kg groups was significantly decreased ( P<0.05) , and serum cortisol concentration in 15 g/kg group was significantly increased ( P<0.05) . The results indicate that CSH can effectively relief heat stress of mid-lacta-ting cows in free stall barn, and increase milk yield and milk quality. The optimum CSH supplemental level in diet is 3 g/kg under the conditions in the present study.关键词
半胱胺盐酸盐/热应激/产奶量/乳成分/血清激素Key words
cysteamine hydrochloride/heat-stress/milk yield/milk composition/serum hormone分类
农业科技引用本文复制引用
吕中旺,于青,刘辉,刘威,卜登攀,孙鹏,王加启,余雄,杨开伦,王志明..半胱胺盐酸盐对泌乳中期热应激 奶牛生产性能的影响[J].动物营养学报,2017,29(8):2777-2784,8.基金项目
"十二五"科技支撑(2012BAD12B02-5) （2012BAD12B02-5）
中国农业科学院科技创新工程(ASTIP-IAS07) （ASTIP-IAS07）
