Effects of Dietary Cation-Anion Balance on Mineral Metabolism of Dairy Cows in the Condition of Heat Stress

ZANG Changjiang; PAN Rong; GUO Tongjun; WANG Lianqun; BU Dengpan; ZHOU Zhenfeng

doi:10.3969/j.issn.1006-267x.2014.12.011

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 12: 3625 - 3634

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.12.011

Ruminant Nutrition

Effects of Dietary Cation-Anion Balance on Mineral Metabolism of Dairy Cows in the Condition of Heat Stress

ZANG Changjiang ,
PAN Rong ,
GUO Tongjun ,
WANG Lianqun ,
BU Dengpan ,
ZHOU Zhenfeng

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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 Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
3. Feed Research Institute, Xinjiang Academy of Animal Sciences, Urumqi 830000, China;
4. College of Animal Sciences, Tarim University, Alar 843300, China

Received date: 2014-06-20

Online published: 2014-12-05

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Abstract

The trial aimed to study the effects of dietary cation-anion balance (DCAB) on mineral metabolism of dairy cows in the condition of heat stress. A total of 75 healthy middle lactation [day in milk was (104.8±12.0) d] China Holstein cows were used in a randomized complete block design and divided into five groups with similar parity, milk yield and weight, i.e. groups Ⅰ, Ⅱ, Ⅲ, Ⅳ and control. The DCAB value in each group was adjusted by providing with different level cation-anion salt. The DCAB values of those groups were 195.76, 186.68, 177.77, 166.94 and 239.12 mEq/kg DM, respectively. The total duration of the experiment was 67 days, the first 7 days of the experiment was the preliminary period and the formal experiment lasted for 60 days. The results showed as follows: the temperature humidity index exceeded 72, and the dairy cows were in heat stress. The rectal temperature of dairy cows in control group was the highest, that in group Ⅰ was minimum. The breathing rate was increased with DCAB value increase, but no significant difference was observed among groups (P>0.05). The concentrations of K, Ca, Mg, P in milk were not significantly affected by the DCAB value (P>0.05). Compared with the groups Ⅲ and Ⅳ, the concentration of Na in milk in the groups Ⅰ, Ⅱ and control was significantly increased (P<0.05), and the concentration of Cl was significantly lower (P<0.05). The effects of DCAB value on the concentrations of K, Mg, P, and Na in serum were not significant difference (P>0.05), the concentration of Ca in serum was decreased with DCAB value increase, while the concentration of Cl had a upward trend. The concentrations of K, Ca, Na, and Mg in urine were not significantly affected by DCAB value (P>0.05), compared with the control group, the concentration of Cl in groups Ⅰ and Ⅱ was significantly increased by 33.826% and 35.598% (P<0.05), and that in groups Ⅲ and Ⅳ was significantly increased by 95.421% and 76.957% (P<0.01). The pH of urine was increased with the DCAB value increase, and compared with groups Ⅲ and Ⅳ, there was a significant increase in groups Ⅰ, Ⅱ and control (P<0.05). Therefore, adding cation-anion balance salt to adjust DCAB values under 177.77 mEq/kg DM can reduce the respiratory rate and relieve heat stress, and increase Ca level in serum of dairy cows, which would improve the health of dairy cows.

Key words： dietary cation-anion balance; heat stress; dairy cow; mineral metabolism

Cite this article

ZANG Changjiang , PAN Rong , GUO Tongjun , WANG Lianqun , BU Dengpan , ZHOU Zhenfeng . Effects of Dietary Cation-Anion Balance on Mineral Metabolism of Dairy Cows in the Condition of Heat Stress[J]. Chinese Journal of Animal Nutrition, 2014 , 26(12) : 3625 -3634 . DOI: 10.3969/j.issn.1006-267x.2014.12.011

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