The relationship of negative energy balance (NEB) and energy metabolism, milk production and reproductive performance during early lactation in dairy cows in Heilongjiang, China
The relationship of negative energy balance (NEB) and energy metabolism, milk production and reproductive performance during early lactation in dairy cows in Heilongjiang, China
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DOI：
10.24099/vet.arhiv.1377
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发表时间：
2022-07
影响因子：
0.5
通讯作者：
Zhijie Wang;Yuxi Song;Chang Zhao;Yunlong Bai;Feng Zhang;C. Xia;S. Fu;Hongyou Zhang;Chuang Xu;Ling Wu
中科院分区：
文献类型：
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作者：
Zhijie Wang;Yuxi Song;Chang Zhao;Yunlong Bai;Feng Zhang;C. Xia;S. Fu;Hongyou Zhang;Chuang Xu;Ling Wu
负能量平衡（NEB）给地球仪的奶牛场造成经济损失。本研究旨在探讨东北牛日粮对黑龙江省集约化奶牛场奶牛泌乳早期能量代谢、繁殖等的影响。根据产后14-21 d的β-羟丁酸（BHBA）、葡萄糖（GLU）、非酯化脂肪酸（NEFA）水平和临床表现，将118头奶牛分为正能量平衡（PEB）组（BHBA 2.8，NEFA 1.2，GLU 0.7 mmol/L，n=51）。采用横断面研究方法，结合Pearson相关分析和前瞻性队列研究对这些指标进行分析。结果显示，产后14-21天，与PEB相比，体况评分、体况损失（BCL）、乳尿素氮、BHBA、NEFA、产犊至第一次动情间隔（ICFE）、每次人工授精妊娠数（P）/AI）和产犊间隔均较高日泌乳量、乳蛋白、乳葡萄糖、发情率和受胎率均低于对照组（P<0.05）。BCL与ICFE、P/AI呈正相关（P<0.05），与发情、受胎率呈负相关（P<0.05）。DL与P/AI呈负相关（P<0.05）。NEB与乏情呈正相关（χ2 M-H=12.63，P=0.0004），NEB引起乏情的危险性是PEB的3.67倍。结果表明，NEB与BCL密切相关，BCL是导致奶牛泌乳和繁殖性能下降的一个因素。NEB是奶牛乏情的危险因素。
Negative energy balance (NEB) causes economic losses to dairy farms around the globe. The aim of this study was to investigate the effect of NEB on energy metabolism, reproduction, etc. during early lactation in dairy cows on intensive farms in Heilongjiang, China. According to β- hydroxybutyric acid (BHBA), glucose (GLU), Non-esterified fatty acid (NEFA) levels, and clinical manifestations 14-21 days postpartum, 118 cows were divided into a positive energy balance (PEB) group (BHBA2.8, NEFA1.2, GLU0.7 mmol/L, n=51). These indicators were analyzed by cross-sectional research methods combined with Pearson correlation analysis and a prospective cohort study. The results showed that at 14-21 days postpartum, compared with the PEB, the body condition score, body condition loss (BCL), milk urea nitrogen, BHBA, NEFA, the interval from calving to first estrus (ICFE), pregnancy per artificial insemination (P/AI), and calving interval were higher (P<0.05), and daily lactation (DL), milk protein and GLU, estrus rate and conception rate were lower in NEB cows. BCL was positively correlated with ICFE and P/AI (P<0.05), and negatively correlated with estrus and conception rate (P<0.05). DL was negatively correlated with the P/AI (P<0.05). There was a positive association between NEB and anestrus (χ2 M-H=12.63, P=0.0004), the risk of anestrus caused by NEB rose by 3.67 times that of PEB. The conclusion showed that NEB is closely related to BCL, which is a factor in the decline of lactation and reproductive performance in dairy cows. NEB is a risk factor for anestrus in dairy cows.