Effects of Fat Powder and Attractant on Physiological Status, Serum Biochemical Indices and Postpartum Milk Yield of Dry Dairy Cows under Heat Stress

HU Linqi; WANG Haihui; ZHAO Xiaojing; SHEN Yizhao; LI Yan; WANG Shanshan; HUO Zihan; WANG Zhiyuan; CAO Yufeng; LI Jianguo; GAO Yanxia

doi:10.3969/j.issn.1006-267x.2022.12.035

2022 , Vol. 34 >Issue 12: 7844 - 7857

DOI: https://doi.org/10.3969/j.issn.1006-267x.2022.12.035

RESEARCH PAPER

Effects of Fat Powder and Attractant on Physiological Status, Serum Biochemical Indices and Postpartum Milk Yield of Dry Dairy Cows under Heat Stress

HU Linqi ,
WANG Haihui ,
ZHAO Xiaojing ,
SHEN Yizhao ,
LI Yan ,
WANG Shanshan ,
HUO Zihan ,
WANG Zhiyuan ,
CAO Yufeng ,
LI Jianguo ,
GAO Yanxia

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1. College of Animal Science and Technology, Hebei Agricultural University, Baoding 071001, China;
2. Baoding Vocational and Technical College, Baoding 071001, China;
3. Key Laboratory of Healthy Breeding in Dairy Cattle (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Baoding 071001, China;
4. College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China;
5. Hebei Technology Innovation Center of Cattle and Sheep Embryo, Baoding 071001, China;
6. Hebei Dairy Industry Technology Research Institute, Shijiazhuang 050000, China

Received date: 2022-05-10

Online published: 2022-12-15

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Abstract

The purpose of the experiment was to study the effects of fat powder and attractants on the physiological status, serum biochemical indices and postpartum milk yield of dry dairy cows under heat stress, to provide a theoretical reference for relieving heat stress of dry dairy cows through nutritional regulation in production. Forty Holstein dairy cows with pregnancy days of (239±5) d and (1.95±0.30) parities at dry milk stage were randomly divided into 4 groups with 10 cows in each group. A 2×2 two-factor experimental design was used, two supplemental levels of attractant[(0 and 2 g/(d·head)] and two supplemental levels of fat powder[0 and 60 g/(d·head)] were set up. The experiment lasted for 97 days, and the cows were fed with the above treatments from 40 to 20 days before the pre-production period. All the cows were managed uniformly from 19 days before the pre-production period to the day of delivery, from the first day of delivery to 21 days after delivery, and from 22 to 56 days after delivery. At each stage, they were fed with diets in the prepartum period, postpartum period, and lactation period, respectively, with free drinking water. The results showed as follows:1) fat powder, attractant and the interaction of them had not significant effects on respiratory rate (P>0.05), but adding fat powder to the diet significantly decreased rectal temperature (P<0.05). 2) Different treatments did not significantly affect dry matter intake of heat-stress dry cows (P<0.05). 3) The activity of serum alkaline phosphatase in the supplementary feeding attractant group was significantly higher than that in other three groups at 28 days before delivery (P<0.05). On the day of calving, the serum glucose content in the supplementary feeding fat powder+attractant group was significantly higher than that in the no supplementary feeding group and supplementary feeding attractant group (P<0.05). Adding attractant to the diet could significantly reduce the serum triglyceride content at 7 days after delivery (P<0.05). 4) Different treatments did not significantly affect serum heat shock protein-70 content at each sampling time points (P>0.05). 5) Different treatments had no significant effect on birth weight of calves (P>0.05). 6) The milk yield in the 3rd week of supplementary feeding attractant group was significantly higher than that of the other three groups (P<0.05), but there was no significant difference among the other three groups (P>0.05). In summary, under the heat stress environment, adding fat powder and attractant in the diet of dry dairy cows, although no effect on dry matter intake, but can increase postpartum serum glucose content. Among them, the single addition of attractant can increase the milk yield in the 3rd week after delivery.

Key words： fat powder; attractant; dry dairy cows; heat stress

Cite this article

HU Linqi , WANG Haihui , ZHAO Xiaojing , SHEN Yizhao , LI Yan , WANG Shanshan , HUO Zihan , WANG Zhiyuan , CAO Yufeng , LI Jianguo , GAO Yanxia . Effects of Fat Powder and Attractant on Physiological Status, Serum Biochemical Indices and Postpartum Milk Yield of Dry Dairy Cows under Heat Stress[J]. Chinese Journal of Animal Nutrition, 2022 , 34(12) : 7844 -7857 . DOI: 10.3969/j.issn.1006-267x.2022.12.035

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