产前奶牛的代谢特征及其对产后初期、初乳质量和被动免疫转移的影响

IF 2.3 2区 农林科学 Q1 VETERINARY SCIENCES
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引用次数: 0

摘要

本研究的目的是评估奶牛产前的生化指标对产后初期、初乳质量和犊牛被动免疫转移的影响。实验在一家商业奶牛场进行,共有 52 头怀孕的多胎荷斯坦奶牛参加。产下双胞胎或雄性奶牛的动物被排除在实验之外。在预产期的第 20 天和产后 24 小时,对犊牛进行采血、体况评分评估和称重。犊牛吃初乳 24 小时后进行血液采样。犊牛血浆用于通过白利糖度(% brix)和总血浆蛋白(TPP)估算被动免疫转移。主成分分析表明,产前尿pH值较高和产前尿Ca值较低的奶牛产后NEFA和BHBA较高。产前和产后NEFA和BHBA最高的奶牛,其初乳中的白利糖度也最低。奶牛初乳的白利糖度直接影响犊牛的白利糖度和TPP。奶牛产前的NEFA对免疫指标有负面影响,NEFA越高,奶牛初乳的乳糖率、犊牛的乳糖率和TPP越低。多变量回归分析表明,产犊前的NEFA是对产犊后奶牛指标和犊牛乳脂率影响最大的指标,此外还有初乳时间和初乳乳脂率(P= 0.0092;r2= 0.83)。产前 NEFA 值较高的奶牛产后血钙较低。产前 NEFA 是对奶牛产后即刻血钙影响最大的指标,与血清钙直接相关,也与被动免疫转移有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metabolic profile of prepartum dairy cows and its influence on the immediate postpartum period, colostrum quality and passive immunity transference
The objective of this study was to evaluate which biochemical markers in the prepartum period of dairy cows influence the immediate postpartum period, the quality of colostrum, and the passive immunity transference in the calves. The experiment was performed on a commercial dairy farm with 52 pregnant multiparous Holstein cows. Animals that gave birth to twins or males were discarded from the experiment. On days −20 of the expected calving date and 24 hours after calving, blood collections, body condition score assessments, and animals weighing were performed. Blood samples from calves were performed 24 hours after colostrum intake. Calf plasma was used to estimate the passive immunity transfer by % brix and total plasma proteins (TPP). In the principal component analysis, it was shown that postpartum NEFA and BHBA was higher in cows with higher prepartum urinary pH and Ca lower prepartum. The cows with the highest NEFA and BHBA in pre and postpartum were the ones that had the lowest % brix in the colostrum. The % brix of the cow’s colostrum directly influenced the % brix and TPP of the calves. The NEFA in the cows prepartum negatively influenced the markers of immunity, the higher the NEFA, the lower the % brix of the cows’ colostrum, % brix of the calves, and TPP. In multivariate regression analyses it was shown that pre-calving NEFA was the marker that most influenced post-calving cow markers and calf % brix, along with colostrum time and % brix of the colostrum (P= 0.0092; r2= 0.83). Cows with higher values NEFA in the prepartum had lower calcemic in the immediate postpartum period. Prepartum NEFA was the marker that most influenced the cows’ immediate postpartum period, being directly related to Ca serum, and also to the passive immunity transference.
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来源期刊
Veterinary journal
Veterinary journal 农林科学-兽医学
CiteScore
4.10
自引率
4.50%
发文量
79
审稿时长
40 days
期刊介绍: The Veterinary Journal (established 1875) publishes worldwide contributions on all aspects of veterinary science and its related subjects. It provides regular book reviews and a short communications section. The journal regularly commissions topical reviews and commentaries on features of major importance. Research areas include infectious diseases, applied biochemistry, parasitology, endocrinology, microbiology, immunology, pathology, pharmacology, physiology, molecular biology, immunogenetics, surgery, ophthalmology, dermatology and oncology.
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