›› 2014, Vol. 41 ›› Issue (9): 95-100.

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Effects of Dietary Cation-anion Balance on Blood Biochemical Parameters of Heat Stressed Lactation Dairy Cows

ZANG Chang-jiang1,2, ZHANG Jun-yu2,4, WANG Lian-qun2,3, GUO Tong-jun2,4, BU Deng-pan2, ZHOU Zhen-feng2   

  1. 1. Xinjiang Key Laboratory of Herbivore Nutrition for Meat & Milk Production, College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    2. State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    3. College of Animal Science, Tarim University, Alar 843300, China;
    4. Feed Research Institute, Xinjiang Academy of Animal Sciences, Urumqi 830000, China
  • Received:2014-05-20 Online:2014-09-20 Published:2014-09-24

Abstract: The objective of the present study was to investigate the effects of dietary cation anion balance on blood biochemical parameters of heat stressed lactation dairy cows. 75 middle lactation (104.8 DIM±12 DIM) China Holstein cows were used in a randomized complete block design into five groups with similar parity, milk yield and weight, the groups Ⅰ, Ⅱ, Ⅲ, Ⅳ and control group were adjusted the DCAB value by providing with different level cation-anion salt, which were 195.76, 186.68, 177.77, 166.94 and 239.12 mEq/kg DM. The experiment was conducted for 67 days, including a 7 day adaptation period and a 60 day treatment period. The results showed that: compared with the groups Ⅲ, Ⅳ and control, the PO2 of the groups Ⅰ, Ⅱ have increased that were significantly different (P<0.05);the effect of DCAB on dairy cows PCO2,pH,HCO3-,TCO2,SATO2 in blood was not significant difference (P>0.05). Compared with the groups Ⅲ, Ⅳ and control group, the groupsⅠ, Ⅱcreatine phosphokinase (CK) in serum have decreased, the effect of DCAB on creatine phosphokinase (CK)in serum was significant difference (P<0.05); the glutamic-pyruvic transaminase (GPT) in serum have increased, which increased 13.98%, 15.99%, 10.77% and 4.55%, 6.40%, 1.61%,respectively, but there were not significant difference (P>0.05). The content of T4, T3 and COR in serum were not significantly affected by change the DCAB value (P>0.05),but effect of DCBA on the content of urea nitrogen in serum was significant difference (P<0.05), the concentrations of urea nitrogen in serum have an increasing trend,with increasing DCAB values, concentrations of urea nitrogen in group Ⅰ was the highest. Therefore, comprehensive index above, under the condition of heat stress, middle lactation cows feeding DCAB value of 186.68 to 195.76 mEq/kg DM diet is more suitable to improve its health.

Key words: dietary cation-anion balance; heat stress; dairy cows; blood; biochemical parameters

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